Page 1 Agilent Technologies. We have made no changes to this manual copy. The HP XXXX referred to in this document is now the Agilent XXXX. For example, model number HP8648A is now model number Agilent 8648A.
Page 2 HP Part No. 08582-90218 Supersedes 08582-90209 Printed in USA December 1997...
Page 3 Notice. The information contained in this document is subject to change without notice. Hewlett-Packard makes no warranty of any kind with regard to this material, including but not limited to, the implied warranties of merchantability and fitness for a particular purpose.
Page 4 United States National Institute of Standards and Technology, to the extent allowed by the Institute’s calibration facility, and to the calibration facilities of other International Standards Organization members. HP 8560 E-Series Spectrum Analyzer Calibration Guide contains regulatory information. Warranty This Hewlett-Packard instrument product is warranted against defects in material and workmanship for a period of one year from date of shipment.
Page 5 Assistance Product maintenance agreements and other customer assistance agreements are available for Hewlett-Packard products. For any assistance, your nearest Hewlett-Packard Sales and contact Service Ofice. Safety Notes The following safety notes are used throughout this manual. Familiarize yourself with each of the notes and its meaning before operating this instrument.
Page 6 General Safety Considerations This is a Safety Class I product (provided with a protective earthing ground incorporated in the power cord). The mains plug shall only be inserted in a socket outlet provided with a protective earth contact. Any interruption of the protective conductor, inside or outside the instrument, is likely to make the instrument dangerous.
Page 7 Tells you how to make measurements with your spectrum analyzer. Tells you how to install the spectrum analyzer. Tells you how to program your spectrum analyzer. HP 8560 E-Series Spectrum Analyzer Quick Reference Guide HP 8560 E-Series Spectrum Analyzer User’s Guide. Is an abbreviated version of the Provides you with a listing of all remote programming commands.
Page 8: Table Of Contents
....HP 85629B Test and Adjustment Module Service Kit ......
Page 9 ....Verifying the HP-IB ......
Page 10 Insufficient equip. to do test <test number> : <test name> ..3-17 No HP-IB address listed for DUT ....3-17 Non-numeric entry other than S entered, or frequency <=O...
Page 11 TAM (Test and Adjustment Module) ....7-10 Loading and Running the HP 8562E/TAM Interface Software (TAM I/F SW) 7-10 Loading the software ..... . .
Page 12 RF Low Band Check ..... . . 7-15 Manual Probe Troubleshooting ....7-15 RF Path Fault Isolation .
Page 13 Offset Lock Loop (part of A15) ....7-47 Fractional N PLL (part of A14) ....7-47 7-48 IF Section .
Page 14 8-32 B-Bit Flash ADC ......8-33 Peak/Pit Detection ......8-33 .
Page 15 Step Gains ......9-31 Cal Oscillator (P/O A4 Assembly) ....9-32 Cal Oscillator Unlock at Beginning of IF Adjust .
Page 16 YTO Main Coil Span Problems (LO Spans >20 MHz) ..11-38 YTO FM Coil Span Problems (LO Spans 2.01 MHz to 20 MHz) ..11-38 Fractional N Span Problems (LO Spans 12 MHz) ... . 1 l-39 First LO Span Problems (All Spans) .
Page 17 ......13-15 Low Voltage Supplies ....13-15 Buck Regulator Control Loop High Voltage Supplies .
Page 18 4-20 ....4-10. HP-IB and AlAl Wl Cable Placement 4-23 ....
Page 19 Al6 Fast ADC and Al7 CRT Driver Mounting Screws ..4-13. HP 85623 Assembly Locations ....4-29 4-14.
Page 20 12-4. HP 85623 Rear-Panel LO SWP Output ....12-14 12-5. HP 85623 Signal at A14J15 Pin 1 ....12-14 12-21 12-6.
Page 21 A-l. HP 85623 Interconnect Block Diagram ....Contents-14...
Page 22 Tables l-l. Instrument Variations ..........l-2.
Page 23 ....12-3. HP 85623 Attenuator Control Truth Table ....
Page 24: General Information
HP 8562E Spectrum Analyzer Service Guide This contains information required to adjust and service the HP 85623 to the assembly level. Serial Numbers and Repair Information Hewlett-Packard makes frequent improvements to its products to enhance performance, usability, or reliability. Hewlett-Packard service personnel have access to complete records of design changes to each type of equipment, based on the equipment serial number.
Page 25: Instrument Variations
“..serial number 3425A00564 and above.” Instrument Variations There are options available to the HP 85623. The following table lists these options and identifies the assemblies which are unique to them. Table l- 1. Instrument Variations...
Page 26: Hp 85629B Test And Adjustment Module
HP 85629B Test and Adjustment Module When attached to the rear panel of the spectrum amdyzer, the HP 85629B test and adjustment module (TAM) provides diagnostic functions for the HP 85623. The TAM is accessed by a computer running interface software; this software is supplied with Option 915, add Service Documentation.
Page 27: Service Kit
Service Kit The spectrum analyzer service kit (HP part number 08562-60021) contains service tools required to repair the instrument. Refer to Table l-2 for a list of items in the service kit. Table l-2. Service Kit Contents Quantity HP Part Number...
Page 28: Reducing Potential For Esd Damage
B u i l d i n g G r o u n d i s t C o r d Figure l-l. Example of a Static-Safe Workstation The suggestions that follow may help reduce ESD damage that occurs during instrument testing and servicing.
Page 29: Static-Safe Accessories
Table 1-3. Static-Safe Accessories Description Set includes: 3M static control mat 0.6 m 1.2 m (2 ft 4 ft) and 4.6 cm (15 ft) ground wire. (The wrist-strap and wrist-strap cord are not included. They must be ordered separately.) Wrist-strap cord, 1.5 m (5 ft). 9300-1383 Wrist-strap, color black, stainless steel, without cord, four adjustable links and 7 mm post-type connection.
Page 30: T Her Packaging
Spectrum analyzer damage can result from using packaging materials other than those specified. Never use styrene pellets in any shape as packaging materials. They do not adequately cushion the equipment or prevent it from shifting in the carton. They cause equipment damage by generating static electricity and by lodging in the spectrum analyzer fan.
Page 31 HP Part Number Item Description Outer Carton 9211-6969 Pads (2) 9220-5073 9220-5072 Top Tray Figure 1-2. Spectrum Analyzer Shipping Container and Cushioning Materials 1-6 General Information...
Page 32: Recommended Test Equipment
Recommended Test Equipment Table l-4 lists the recommended test equipment required for operation verification, performance tests, adjustments, troubleshooting, and the Test and Adjustment Module. Any equipment that meets the critical specifications given in the table can be substituted for the recommended model(s).
Page 33 Table l-4. Recommended Test Equipment Instrument Critical Specifications for Equipment Substitution Model Frequency range: HP 8340A/B* 10 MHz to 13.2 GHz HP 83630A ( t w o r e q u i r e d ) opt 001, 008 Frequency accuracy (CW): x l0-g/day Leveling modes: Internal &...
Page 34 Frequency standard Output frequency: 10 MHz HP 5061B Accuracy: <l Microwave frequency counter Frequency range: 9 MHz to 7 GHz HP 5343A OR External frequency reference input HP 5350B* Option 001 Universal counter Modes: TI A+B, frequency count HP 5334A/B...
Page 35 Table 1-4. Recommended Test Equipment (continued) Instrument Critical Specifications Recommended for Equipment Substitution Model Required to run operation verification software. HP 9816A, No substitute. HP 9836A/C, HP 310,320 HP 332,360 Bandwidth (3 dB): dc to 100 MHz HP 54501A* Two channels Minimum vertical deflection factor: 55 mV/div Minimum timebase setting: <lOO ns...
Page 36 10 dB fixed attenuator Attenuation accuracy: <f0.6 dB Option 010 Maximum SWR: 1.2 (dc to 2.9 GHz) Supplied with HP 8481D HP 11708A Reference attenuator * Part of microwave workstation P = performance tests; A = adjustments; M = test & adjustment module; T = troubleshooting;...
Page 37 Instrument Critical Specifications U s e for Equipment Substitution M o d e l Termination Frequency range: dc to 13.2 GHz HP 909A Impedance: 50 52 Maximum SWR: <l.lO Connector: Type N(m) Low-pass filter Cutoff frequency: 50 MHz 0955-0306 Rejection at 65 MHz: >40 dB Rejection at 75 MHz: >60 dB...
Page 38 Required w/operation verification software HP 10833B ( e i g h t r e q u i r e d ) Required w/HP 85629B test & adjustment module Length: 2 m (6.6 ft.) A d a p t e r s...
Page 39: Sales And Service Offices
Sales and Service Offices Hewlett-Packard has sales and service offices around the world providing complete support for Hewlett-Packard products. To obtain servicing information, or to order replacement parts, contact the nearest Hewlett-Packard Sales and Service Office listed in Table l-5. In any correspondence, be sure to include the pertinent information about model numbers, serial numbers, and assembly part numbers.
Page 40 Table 1-5. Hewlett-Packard Sales and Service Offices US FIELD OPERATIONS Headquarters California, Northern California, Southern Hewlett-Packard Co. Hewlett-Packard Co. Hewlett-Packard Co. 19320 Pruneridge Avenue 301 E. Evelyn 1421 South Manhattan Ave. Cupertino, CA 95014 Mountain View, CA 94041 Fullerton, CA 92631 (800) 752-0900 (415) 694-2000 (714) 999-6700...
Page 41: Adjustment Procedures
Introduction This chapter contains information on automated and manual adjustment procedures. Perform the automated procedures using the HP 85629B test and adjustment module (TAM). Never perform adjustments as routine maintenance. Adjustments should be performed after a repair or performance test failure. Refer to Table 2-l to for which adjustments to perform.
Page 42: Safety Considerations
Although this instrument has been designed in accordance with international safety standards, this manual contains information, cautions, and warnings which must be followed to ensure safe operation and to prevent damage to the instrument. Service and adjustments should be performed only by qualified service personnel. instrument and protective covers removed.
Page 43: Adjustment Tools
Two different tuning tools may be necessary for IF bandpass adjustments, depending upon the type of tuning slug used in the slug-tuned inductors. If the tuning slug requires a slotted tuning tool, use HP part number 8710-1010. If the tuning slug requires a forked tuning tool, use HP part number 8710-0772.
Page 44 LO distribution amplifier adjustment A7 switched LO Frequency response adjustment (or perform the distribution amplifiei frequency response performance test in the HP 8560 E-Series Spectrum Analyzer Calibration Guide. The adjustment must be performed if the performance test fails.: 2-4 Adjustment Procedures...
Page 45 Frequency response adjustment A9 input attenuator Frequency response adjustment (or perform the frequency response performance test in the HP 8560 E-Series Spectrum Analyzer Calibration Guide. The adjustment must be performed if the performance test fails A10 RYTHM YIG-tuned filter/mixer (RYTHM) adjustment...
Page 46: Adjustable Components
Table 2-2. Adjustable Components Reference Adjustment Adjustment Description Designator Name Number 16 MHz PLL ADJ Adjusts the free-running frequency of the 16 MHz CPU clock. DGTL X GAIN Adjusts the horizontal gain in the X line generator. SWEEP OFFSET Adjusts the beginning of the trace to the leftmost vertical graticule line in fast-analog zero-span mode.
Page 47 Table 2-2. Adjustable Components (continued) Reference Adjustment Adjustment Description Name Number Designator XTAL CTR 3 Adjusts center frequency of third stage of crystal bandwidth filter to 10.7 MHz. XTAL CTR 4 Adjusts center frequency of fourth stage of crystal bandwidth filter to 10.7 MHz. HV ADJ Adjusts the voltage between A6TP405 and A6TP401 to the voltage marked on the A6Al high voltage...
Page 48: Factory Selected Components
Table 2-3. Factory Selected Components Adjustment Basis of Selection Reference Designator Number Selected to optimize center frequency of LC tank that loads the crystal. Selected to optimize center frequency of LC tank that loads the crystal. Selected to optimize LC pole center frequency. Selected to optimize LC pole center frequency.
Page 49: Using The Tam
Using the TAM The HP 85629B TAM, in conjunction with the HP 8562E/TAM Interface Software (TAM I/F SW), can be used to perform approximately half of the spectrum analyzer adjustment procedures. Table 2-4 lists the TAM adjustments and their corresponding manual adjustments.
Page 50: Tam Adjustments
External mixer bias adjustment 15. External mixer amplitude External mixer amplitude adjustment ‘These TAM adjustments are not compatible with the HP 85623. Either perform the manual adjustment, or use the frequency response adjustment software described in Chapter 3, “Frequency Response Adjustment Software.”...
Page 51: Required Test Equipment For Tam
Table 2-5. Required Test Equipment for TAM 10. Low band flatness 11. High band flatness Not applicable Not Applicable 12. Calibrator amplitude Power meter HP 8902A, HP 436A, HP 438A Power sensor (300 MHz) HP 8482A, HP 8481A 13. 10 MHz reference Frequency counter...
Page 52: Front End Cal (Adjustment)
Front End Cal (adjustment) This procedure automates two manual procedures: Frequency Response Adjustment, and YIG-Tuned Filter/Mixer (RYTHM) Adjustment. This procedure is described in Chapter 3, “Frequency Response Adjustment Software.” 2-12 Adjustment Procedures...
Page 53: High Voltage Power Supply Adjustment
1. High Voltage Power Supply Adjustment 1. High Voltage Power Supply Adjustment A6 power supply There is no related performance test for this adjustment. The high voltage power supply is adjusted to the voltage marked on the A6Al HV module. The A6Al HV module is characterized in the factory to ensure that the display filament voltage is set to 6.0 V rms when the +llO Vdc ( nominal) supply is set to the voltage marked on the HV module.
Page 54 .........
Page 55: Display Adjustment
BNC, 122 cm (2 required) ........
Page 56 2. Display Adjustment Perform the 16 MHz PLL Adjustment in this chapter before proceeding with this adjustment. 1. Turn the spectrum analyzer off by pressing (LINE). Remove the spectrum analyzer cover and fold out the A2 controller and A3 interface assemblies as illustrated in Figure 2-2. Connect the CAL OUTPUT to the INPUT.
Page 57: Crt Adjust Pattern
2. Display Adjustment 12. Adjust the rear-panel TRACE ALIGN until the leftmost line of the test pattern is parallel with the CRT bezel. See Figure 2-3. 13. Adjust the rear-panel X POSN and A17R55 X GAIN until the leftmost “@” characters and the softkey labels appear just inside the left and right edges of the CRT bezel.
Page 58 17. Press (CAL), MORE I of 2 , and CRT ADJ PATTERN. Locate the dot just below the HP logo. Adjust A17R93 ASTIG for the smallest round dot possible. 18. Adjust A17R34 COARSE FOCUS and A17R92 DDD for the best focus of the characters at the center of the screen.
Page 59 22. Set A2R209 SWEEP OFFSET, A2R218 VIDEO OFFSET, and A2R268 SWEEP GAIN to midrange. Adjustment locations are shown in Figure 2-4 for these A2 adjustments. 23. Set the HP 355D to 30 dB attenuation. 24. Press (PRESET) on the spectrum analyzer, and connect the equipment as shown in Figure 2-2.
Page 60 2. Display Adjustment 25. Press (MKR), [m), R 4 REF LYL. If the marker is not at the top graticule, press MARKER-, REF LVL again. Press (SAVE), SAVE STATE 27. Set the sweep time to 10 ms. 28. Press STATE 1. 29.
Page 61: If Bandpass Adjustment
Digital voltmeter ..........HP 3456A HP 34118A .
Page 62: Tam Connector Pin Locations
2. Connect the negative DVM lead to pin 6 of A5J6. See Figure 2-5 and Figure 2-6. Set the HP 3456A controls as follows: Function ........... DCVOLTS Range .
Page 63: Factory-Selected Lc Filter Capacitors
3. IF Bandpass Adjustment 11. Move the positive DVM test lead to A5TPl (this is a resistor-lead type of test point). 12. Adjust A5L702 LC CTR 4 using the procedure in steps 4 through 6. Table 2-6. Factory-Selected LC Filter Capacitors Table 2-7.
Page 64: Factory-Selected Xtal Filter Capacitors
3. IF Bandpass Adjustment If the range for the XTAL CTR adjustment is insufficient, replace the appropriate factory-selected capacitor as listed in Table 2-8. To determine the correct replacement value, center the XTAL CTR adjustment, and press After the message disappears, read IF ADJUST STATUS the DVM display.
Page 65: Capacitor Part Numbers
3. IF Bandpass Adjustment Table 2-10. Capacitor Part Numbers HP Part Number 0160-4793 0160-4792 0160-4791 0160-4790 0160-4789 0160-4788 15 18 0160-5699 0160-4787 0160-5903 0160-4786 Adjustment Procedures 2-25...
Page 66: If Amplitude Adjustments
4. IF Amplitude Adjustments The IF amplitude adjustments consist of the cal oscillator amplitude adjustment and the reference 15 dB attenuator adjustment. A4 log amp/Cal oscillator A5 IF assembly IF Gain Uncertainty Scale Fidelity This adjustment sets the output amplitude of the A4 log amp/Cal oscillator and the absolute amplitude of the reference 15 dB attenuator.
Page 67: If Amplitude Adjustment Locations
.........
Page 68 11. Set the spectrum analyzer reference level to -60 dBm. If markers are displayed, press 12. Set the HP 3335A (-1 to -60 dBm. 13. Connect a BNC cable between the 50 R output of the HP 3335A and the spectrum analyzer INPUT 500.
Page 69 Resolution bandwidth ......... . 300 kHz 28. Connect a BNC cable between the HP 85633 CAL OUTPUT and INPUT 5Os1.
Page 70: Dc Log Amplifier Adjustments
5. DC Log Amplifier Adjustments There are three DC log adjustments; limiter phase, linear fidelity, and log fidelity. A4 log amp/Cal oscillator IF Gain Uncertainty Scale Fidelity These three adjustment need only be done under the following conditions: Limiter phase Only if a repair is made to blocks F, G, H, I, or J.
Page 71: Dc Log Adjustment Locations
.........
Page 72 Figure 2-9. See Figure 2-10 for adjustment location. Connect the HP 3335A 50 R output to the spectrum analyzer 50 fi input. Press IuNE) to turn the spectrum analyzer on.
Page 73 Figure 2-9. See Figure 2-10 for adjustment location. 2. Connect the HP 3335 50 0 output to the spectrum analyzer 50 fl input. Press (LINE) to turn the spectrum analyzer on.
Page 74: Sampling Oscillator Adjustment
.........
Page 75: Tam Connector Pin Locations
Span ............OHz 3. Set the HP 3456A controls as follows: Function .
Page 76 6. Sampling Oscillator Adjustment Table 2-l 1. Sampling Adjustments 2158.3 293.478 2196.3 295 .ooo 2378.3 296.471 2422.3 297.222 2-36 Adjustment Procedures...
Page 77: Yto Adjustment
Figure 2-13. YTO Adjustment Setup Microwave frequency counter ......HP 5343A Option 001 Adapters Type N (m) to BNC (f) .
Page 78 [RECALL), RECALL STATE, STATE 0. On the HP 5343A, press [SHIFT) 7 and set the controls as follows: Sample rate ........Fully counterclockwise 10 Hz-500 MHz/500 MHz-26.5 GHz switch .
Page 79 7. YTO Adjustment R 4 2 A l 4 R 9 3 R 7 6 J 2 3 Figure 2-14. YTO Adjustment Locations 11. Place the jumper on A14J23 in the NORM position (pins 1 and 2 jumpered). 12. Disconnect the SMA cable from the first LO OUTPUT jack and reconnect the 500 termination on the first LO OUTPUT.
Page 80: Lo Distribution Amplifier Adjustment
.........
Page 81: Tam Connector Pin Locations
8. LO Distribution Amplifier Adjustment 1. Set the HP 85623 (LINE) switch to off and disconnect the line cord. Remove the cover and fold down the Al5 RF and Al4 Frequency Control assemblies. 2. Move the jumper on A2J12 from the WR PROT to the WR ENA position. The jumper is on the edge of the A2 board assembly and can be moved without folding the board down.
Page 82 17. Record the DAC value: DAC value for 4.60 GHz = 18. To set the band 2 sense voltage, set the HP 85623 center frequency to 9.46 GHz. On the HP 85623, press (CAL), MDRE I OF 2, SERVICE CAL DATA, LO LEVELS, and INT LO LEVEL.
Page 83: Frequency Response Adjustment
However, an automated procedure, with software, is provided by HP. The software can allow the adjustment to be performed in less than 20 minutes. The Automated HP 85623 “Front End Cal” adjustment performs this task, and is described in Chapter 3, “Frequency Response Adjustment Software.”...
Page 84: Frequency Response Adjustment Setup
........I ..
Page 85 8. Enter the appropriate power sensor calibration factor into the HP 8902A. 9. Set the HP 8340A/B m output to the frequency indicated in the active function area of the HP 85623 display. Adjust the HP 8340A/B POWER LEVEL for a -10 dBm reading on the HP 8902A.
Page 86 24. Adjust the HP 8340A/B POWER LEVEL for a -10 dBm reading on the HP 8902A. 25. On the HP 85623, adjust the RF gain DAC value using the knob or keypad until the marker reads -10 dBm fO.10 dB.
Page 87: Calibrator Amplitude Adjustment
Measuring receiver ........
Page 88: Mhz Reference Adjustment-Ocxo (Non-Option 103)
11. 10 MHz Reference Adjustment-OCXO (Non-Option 103) A21 OCXO assembly Replacement oscillators are factory adjusted after a complete warmup and after the specified aging rate has been achieved. Thus, readjustment should typically not be necessary after oscillator replacement and is generally not recommended.
Page 89 BNC, 122 cm (2 required) ........
Page 90 INT/EXT switch (rear panel) ........EXT Select a 1 second gate time on the HP 5334A/B frequency counter by pressing ( G A T E ] , 1 , [ T I M E ) .
Page 91: Mhz Reference Adjustment-Tcxo (Option 103)
Figure 2-20. 10 MHz Reference Adjustment Setup-TCXO Microwave frequency counter ......HP 5343A Option 001 Frequency standard .
Page 92 12. 10 MHz Reference Adjustment-TCXO (Option 103) Allow the spectrum analyzer to warm up for at least 30 minutes before performing this adjustment. 1. Connect the equipment as shown in Figure 2-20. Prop up the Al4 frequency control assembly. 2. Set the frequency counter controls as follows: Sample rate .
Page 93: Demodulator Adjustment
AM/FM signal generator ........
Page 94 .........
Page 95: Demodulator Adjustment Locations
13. Demodulator Adjustment 8. A 1 kHz sine wave should be observed on the oscilloscope. Rotate the volume knob on the front panel of the spectrum analyzer until the amplitude of the 1 kHz signal is at about 150 mV (3 divisions on the oscilloscope). 9.
Page 96: External Mixer Bias Adjustment (Non-Option 327)
Al5 RF assembly. Reconnect the power cord and set the luNE) switch to on. 2. Set the HP 3456A controls as follows: Function ........... . DC VOLTS Range .
Page 97: External Mixer Amplitude Adjustment (Non-Option 327)
15. External Mixer Amplitude Adjustment (Non-Option 327) 15. External Mixer Amplitude Adjustment (Non-Option 327) Al5 RF assembly IF Input Amplitude Accuracy The slope of the flatness compensation amplifiers is determined. The user-loaded conversion losses for K-band are recorded and reset to 30 dB. A 310.7 MHz signal is applied to the power sensor and the power level of the source is adjusted for a -30 dBm reading.
Page 98 50 MHz reference attenuator ........
Page 99: Conversion Loss Data
Connect the HP 8481D to the HP 11708A attenuator already connected to the HP 8902A RF power connector. Zero and calibrate the HP 8902A/HP 8481D combination in log mode. Enter the power sensor 50 MHz cal factor into the HP 8902A. Connect the power sensor, through an adapter, to the SMA cable.
Page 100: Rythm Adjustment Setup
Synthesized sweeper ........
Page 101 Span ............OHz On the HP 85623, press ICAL), IF AD3 ON OFF so OFF is underlined, MORE 1 OF 2, SERVICE CAL DATA, PEESEL ADJ,then PRESET ALL DACS.
Page 102 15. Place the WR PROT/WR ENA jumper on the A2 controller assembly in the WR PROT position. 16. On the HP 85623, press [E), MORE I OF 2, FACTORY PRSEL PK , m), then SAVE PRESEL PK. 2-62 Adjustment Procedures...
Page 103 Microwave frequency counter ........
Page 104 17. 16 MHz PLL Adjustment 1. Press m to turn the spectrum analyzer off. Remove the spectrum analyzer cover and fold out the A2 controller and A3 interface assemblies. Use a pc board prop to hold up the A3 interface assembly, as shown in Figure 2-26. 2.
Page 105 17. 16 MHz PLL Adjustment 8. Adjust A2R152 (16 MHz PLL ADJ) until the microwave frequency counter reads 14.4 MHz 6200 KHz. 9. Reconnect W22 to A2J8. The microwave frequency counter should read 16 MHz. If the counter reads 16 MHz and the display is still distorted, perform the display adjustments in “Display Adjustment,”...
Page 106 Spectrum analyzer ........
Page 107 Frequency Response Adjustment Software This chapter describes how to load and run the frequency response adjustment software, included with every HP 85623 Option 915 (add Service Documentation). This software actually automates two manual adjustments: Frequency Response Adjustment, and YIG-Tuned Filter/Mixer (RYTHM) Adjustment. The automated test software is designed to adjust the flatness and preselector of the spectrum analyzer in a minimum amount of time.
Page 108 The following paragraphs describe requirements for controllers and test equipment. Once the proper equipment is identified, proceed to “Equipment Connections.” The HP 85623 Frequency Response Adjustment software is only for the HP 85623 spectrum analyzer. Errors will occur if this software is used to adjust spectrum analyzers other than the HP 85623.
Page 109: Required Test Equipment Summary
The adjustment can use various model numbers of a particular equipment type. Information about selecting the equipment model number you want to use is provided in “Setting HP-IB Addresses” in this chapter under “Frequency Response Adjustment Software.” The validity of the Frequency Response Adjustment depends in part on required test equipment measurement accuracy.
Page 110 300 computers. HP-IB Cables All test equipment controlled by HP-IB should be connected to the internal HP-IB of the controller (select code 7). If the controller has only one HP-IB connector, connect the spectrum analyzer to it as well. If the controller has dual HP-IB connectors, connect the spectrum analyzer under test to the second HP-IB (typically, select code 8).
Page 111 A double-sided disk drive must be used. The frequency response adjustment software will not fit on a single-sided formatted disk. Press (EXECUTE) on HP 9000 Series 200 computers, or (i%i%i) on HP 9000 Series 300 computers, to load the software and start the program running.
Page 112 Addresses, or no address is listed, a message appears where the model and serial numbers are normally displayed. The program also queries the time and date in the computer. If an HP 9000 Series 200 computer is used, it might be necessary to reset the time and date; HP 9000 Series 300 computers have built-in real-time clocks.
Page 113 For example, if the HP 8902A is at address 14 on a bus with a select code of 7, enter an address of 714. If the HP 8902A were on a bus with a select code of 12, you should enter an address of 1214.
Page 114 CONDITIONS file is loaded automatically the next time the program is run. The default system mass storage file location is : ,700,l. For the HP 9000 Model 236 (HP 9836), it is necessary to use an external disk drive. The disk drive must support double-sided format.
Page 115 All frequencies should be entered in MHz. To use the HP 8485A, it must have a calibration factor at 10 MHz. Standard HP 8485As have calibration factors down to only 50 MHz.
Page 116 Menu to return to the Conditions Menu. The Adjust Menu displays the one adjustment that can be performed by the frequency response adjustment program. If HP-IB controlled equipment for a given adjustment does not respond over HP-IB, that adjustment is flagged MISSINGETE( missing electronic test equipment).
Page 117 To obtain a list of required test equipment for running a test, move the pointer to the test, press List Equip. All HP-IB controlled equipment and passive devices, other than required cables and adapters, are listed. If a test is flagged MISSING ETE...
Page 118 HP-IB address for response. Verify flus does not verify that a particular piece of equipment is at a specified address. queries the HP-IB for the serial number and model number of the Query DUT S/N spectrum analyzer under test.
Page 119 Single Test runs the adjustment indicated by the pointer, once. Cal Sensor allows you to recalibrate the current power sensor and resets the internal “time-since-last-calibration” timer. List Equip lists the required equipment for the test indicated by the pointer. Menu returns to the Conditions Menu.
Page 120 DAC values, and the preselector peak DAC values are stored in EEROM. Front End Cal refers to the HP 8481A or 8485A power sensor as the “Channel B Power Sensor,” even if a single-channel power meter (such as an HP 436A or 8902A) is being used.
Page 121 Front End Cal (YIG-Tuned Filter/Mixer (RYTHM) and Frequency Response Adjustment) BNC CABLE ADAPTER Figure 3-1. Front End Cal Adjustment Setup Frequency Response Adjustment Software 3-15...
Page 122 The error message descriptions include recommended corrective action. Address must be from 0 to 30 inclusive HP-IB addresses must be in the range from 0 to 30. Press any key and enter new address i this range. Cal Factor outside of 0 to 150% range entered Cal Factor entries must be within this range.
Page 123 Select code <value> does not currently support HP-IB operations The address just entered specified a select code which is not an HP-IB interface. Check the address entered and the select code of the appropriate interface.
Page 124 6481A Sensor cal data minimum frequency not <= 50 MHz Program requires the HP 8481A power sensor to have a Cal Factor at or below 50 MHz. Use Sensor Utilities to add a Cal Factor at or below 50 MHz.
Page 125 The program expected a numeric entry but did not receive one. Enter a numeric entry. <number of instruments> instruments have HP-IB addresses of <HP-IB address> The indicated number of instruments have all been set to the same HP-IB address. Review the addresses and eliminate the duplication.
Page 126 Assembly Replacement This chapter describes the removal and replacement of all major assemblies. The following replacement procedures are provided: Access to Internal Assemblies Cable Color Code Procedure 1. Spectrum Analyzer Cover Procedure 2. Al Front Frame/Al8 CRT Procedure 3. AlAl Keyboard/Front Panel Keys Procedure 4.
Page 127 Access to Internal Assemblies Servicing the HP 85623 requires the removal of the spectrum analyzer cover assembly and folding down six board assemblies. Four of these assemblies lay flat along the top of the spectrum analyzer and two lay flat along the bottom of the spectrum analyzer. All six assemblies are attached to the right side frame of the spectrum analyzer with hinges and fold out of the spectrum analyzer allowing access to all major assemblies.
Page 128 For example, W2 coax 93, indicates a white cable with an orange stripe. Table 4-1. Required Tools Description HP Part Number 8720-0015 3 mm hex (Allen) wrench 8710-1366 4 mm hex (Allen) wrench 8710-1164 No.
Page 129: Hinged Assemblies
1. Disconnect the line-power cord, remove any adapters from the front panel connectors, and place the spectrum analyzer on its front panel. 2. If an HP 85620A Mass Memory Module or HP 85629B Test and Adjustment Module is mounted on the rear panel, remove it. Loosen (but do not remove) the four rear-bumper screws, using a 4 mm hex wrench.
Page 130 A6AlW3 post-accelerator cable. Make sure that the spectrum analyzer line-power switch is in the off position. 6. Connect a high voltage probe (lOOO:l), such as the HP 34111A to a voltmeter with a 10 megohm input. 7. Connect the clip lead of the probe (ground) to the chassis of the spectrum analyzer.
Page 131 Procedure 2. Al Front Frame/Al8 CRT 15. Place the spectrum analyzer on its right side frame with the front frame assembly hanging over the front edge of the workbench. 16. Fold out the Al4 and Al5 assemblies as described in steps 3 and 4 under “Procedure 9. Al4 and Al5 Assemblies Removal.”...
Page 132 Procedure 2. Al Front Frame/Al8 CRT The voltage potential at A8AlW3 is +9 kV. Failure to discharge A8AlW3 severe electrical shock correctly may result in to personnel and damage to the instrument. CONDUCTIVE SHAFT \ CL I P LEAD INSULATED HANDLE Figure 4-2.
Page 133 Procedure 2. Al Front Frame/Al8 CRT (4 PLACES) ENEATH CABLES) Figure 4-3. A9, A18, and Line-Switch Assembly Mounting Screws 17. Remove screw (2) securing the A9 input attenuator assembly to the center support on the front frame. See Figure 4-3. 18.
Page 134 Procedure 2. Al Front Frame/Al8 CRT connectors and cover the tip with heatshrink tubing or tape to avoid scratching the enameled front panel. 23. Loosen screw (3) securing the line-switch assembly to the front frame. This is a captive screw and cannot be removed from the line-switch assembly. See Figure 4-3. 24.
Page 135 Figure 4-5. Installing the CRT and front frame Assemblies Use care when handling the glass CRT EM1 shield. The glass may be cleaned using thin-film cleaner (HP part number 8500-2163) and a lint-free cloth. When installing the glass shield, face the side of the glass with the silver coated edge towards the inside of the spectrum analyzer.
Page 136 Procedure 2. Al Front Frame/Al8 CRT SK127 Figure 4-8. Placing the CRT into the Front Frame 5. Connect A18Wl to A17J5. 6. Snap CRT cable W9 onto the end of the CRT assembly. 7. Fully seat the front frame and CRT assemblies into the spectrum analyzer. 8.
Page 137 Procedure 2. Al Front Frame/Al8 CRT 15. Use a 5/16-inch wrench to connect W41 from the A9 input attenuator to the front panel INPUT 50R connector. Make sure that W40, W36, and AlWl are routed between W41 and the attenuator bracket. Secure the A9 input attenuator bracket to the center support on the front frame using one panhead screw.
Page 138 Procedure 3. AlAl Keyboard/Front Panel Keys Procedure 3. Al Al Keyboard/Front Panel Keys 1. Remove the front frame from the spectrum analyzer as described in “Procedure 2. Al Front Frame/Al8 CRT.” 2. Place the front frame face-down on the bench and remove the front frame center support. 3.
Page 139 Procedure 4. AlA RPG 1. Remove the A9 input attenuator as described in “Procedure 8. A7 through Al3 Assemblies.” 2. Disconnect the RPG cable from the AlAl keyboard assembly. 3. Remove the front panel RPG knob using a number 6 hex (Allen) wrench. Use a 7/16-inch nut driver to remove the nut holding the RPG shaft to the front panel.
Page 140 Procedure 5. A2, A3, A4, and A5 Assemblies Procedure 5. A2, A3, A4, and A5 Assemblies 1. Remove the spectrum analyzer cover. 2. Place the spectrum analyzer on its right side frame. 3. Remove the eight screws holding the A2, A3, A4, and A5 assemblies to the top of the spectrum analyzer.
Page 141: A2, A3, A4, And A5 Assembly Removal
Procedure 5. A2, A3, A4, and A5 Assemblies SK129 Figure 4-7. A2, A3, A4, and A5 Assembly Removal 1. Place the spectrum analyzer on its right side on the work bench. 2. Attach the assembly being installed to the two chassis hinges with two panhead screws. 3.
Page 142: Assembly Cables (1 Of 2)
Procedure 5. A2, A3, A4, and A5 Assemblies (4 PLACES) C A B L E S Figure 4-8. Assembly Cables (1 of 2) Assembly Replacement 4- 17...
Page 143 Procedure 5. A2, A3, A4, and A5 Assemblies w 2 9 WH I TE V I O L E T ORANGE Figure 3-8. Assembly Cables (2 of 2) 4-18 Assembly Replacement...
Page 144 A6 power supply top shield. 9. Fold the A2 and A3 assemblies together as a unit into the spectrum analyzer. Be sure to fold HP-IB cable A19Wl between the A3 and A4 assemblies, using the two sets of hook and loop (Velcro) fasteners.
Page 145 Procedure 5. A2, A3, A4, and A5 Assemblies 12. Secure the assemblies using the eight screws removed in “Removal,” step 3. See Figure 4-7. A3 J602 SK133 Figure 4-10. HP-IB and AlAl Wl Cable Placement 4-20 Assembly Replacement...
Page 146 A6AlW3 post-accelerator cable. Make sure that the spectrum analyzer line-power switch is in the off position. 6. Connect a high voltage probe (lOOO:l), such as the HP 34111A to a voltmeter with a 10 megohm input. 7. Connect the clip lead of the probe (ground) to the chassis of the spectrum analyzer.
Page 147 Procedure 6. A6 Power Supply Assembly 15. Disconnect all cables from the A6 power supply assembly. See Figure 4-11. 16. Use a TORX screwdriver to remove the hardware from the shield wall, the heatsink, and the A6 power supply assembly. 17.
Page 148 Procedure 6. A6 Power Supply Assembly POWER CABLE T I E TORX SCREW L I N E POWER TORX SCREWS Figure 4-l 1. A6 Power Supply Connections Assembly Replacement 4-23...
Page 149: Power Supply Cover
Procedure 6. A6 Power Supply Assembly 6. Ensure that all cables are safely routed and will not be damaged when securing the A6 cover. 7. Secure the power supply cover shield to the power supply using three flathead screws (1). See Figure 4-12.
Page 150 A6AlW3 post-accelerator cable. Make sure that the spectrum analyzer line-power switch is in the off position. 6. Connect a high voltage probe (lOOO:l), such as the HP 34111A to a voltmeter with a 10 megohm input. 7. Connect the clip lead of the probe (ground) to the chassis of the spectrum analyzer.
Page 151 Procedure 7. A6Al High Voltage Assembly 15. Remove the three screws securing the A6Al high voltage assembly to the A6 power supply assembly. 16. Disconnect ribbon cable A6AlWl from A6J5. See Figure 4-11. For Option 007 spectrum analyzers: Remove the two screws (1) securing two board-mounting posts to the left side frame and remove the posts.
Page 152 Procedure 7. A6Al High Voltage Assembly 7. Place the Al7 CRT Driver assembly into the center-deck mounting slot nearest the CRT. Use caution when routing cables to avoid damage. 8. For Option 007 spectrum analyzers: Place the Al6 FADC assembly into the center-deck mounting slot nearest the left side frame.
Page 153 Use a torque wrench to tighten all SMA connectors to 113 Ncm (10 in-lb). HP part number 8710-1655 can be used for this purpose. The style of torque wrench may vary, but in all cases do not tighten the connectors beyond the point at which the torque wrench “clicks”...
Page 154 Procedure 6. A7 through Al3 Assemblies w 3 9 w 4 2 A l 3 w 5 7 w 3 5 w 1 3 W I 0 WI 1 Figure 4-14. HP 6562E Assembly Locations Assembly Replacement 4-29...
Page 155 A7 First LO Distribution Amplifier 1. Remove the two screws securing the assembly to the spectrum analyzer center deck. 2. Use a 5/16-inch wrench to disconnect W38 and W39 at A7Jl and A7J2. 3. Disconnect W46 at A7J3. 4. Disconnect W42 at the front panel First LO OUTPUT connector. Loosen W42 at A7J5. 5.
Page 156 A8 Low Band Mixer A8 Low Band Mixer 1. Place the spectrum analyzer upside-down on the work bench with Al4 and Al5 folded out to the left. 2. Use a 5/16-inch wrench to remove W45 from FL1 and A8Jl. 3. Loosen W56 and W39 at A8J2, and A8J3. 4.
Page 157 A9 Input Attenuator 1. Place the spectrum analyzer upside-down on the work bench. 2. Remove W41 and W43. 3. Disconnect W34 from A7 and move this cable out of the way. 4. Remove screw (1) securing the attenuator to the front frame center support. See Figure 4-14.
Page 158 A9 Input Attenuator Figure 4-15. A9 Mounting Screw at Right Side Frame Assembly Replacement 4-33...
Page 159 A10 YIG-Tuned Filter/Mixer (RYTHM) Do NOT remove the brackets from the A10 assembly. If these brackets are removed and reinstalled, the performance of A10 will be altered. A new or rebuilt A10 assembly includes new mounting brackets already attached to it. Disconnect W16 ribbon cable from the A10 assembly.
Page 160 5. Install W56/FL2/W57 between A8J2 and A13Jl. 6. Reconnect W16 ribbon cable to the A10 assembly. 7. Torque all SMA connections to 113 Ncm (10 in-lb). Figure 4-17. HP 8562E All Mounting Screws at Right Side Frame Assembly Replacement 4-35...
Page 161 Al3 Second Converter Turn off the spectrum analyzer power when replacing the Al3 second converter assembly. Failure to turn off the power may result in damage to the assembly. 1. Place the spectrum analyzer upside-down on the work bench. 2. Disconnect W33, coax 81, and W35, coax 92, from the Al3 assembly. 3.
Page 162 Procedure 9. Al4 and A15 Assemblies Procedure 9. Al4 and Al5 Assemblies 1. Remove the spectrum analyzer cover as described in “Procedure 1. Spectrum Analyzer Cover.” 2. Place the spectrum analyzer on its right side frame. 3. Remove the eight screws (1) holding the Al4 and Al5 assemblies to the bottom of the spectrum analyzer.
Page 163 Procedure 9. Al4 and Al5 Assemblies DO NOT fold the board assemblies out of the spectrum analyzer one at a time. Always fold the Al4 and Al5 assemblies as a unit. Folding out one assembly at a time binds the hinges attaching the assemblies and may damage an assembly and hinge.
Page 164 Procedure 9. Al4 and Al5 Assemblies W I 0 COMPONENT SlDE w 3 4 W I 2 WI 1 ’ A l 5 ’ w 3 5 w 2 2 w37 - A l 5 N O T USED- Figure 4-19. Al4 and Al5 Assembly Cables Assembly Replacement 4-39...
Page 165 Procedure 10. Al6 Fast ADC and Al7 CRT Driver 1. Remove the spectrum analyzer cover assembly and fold out the A2, A3, A4, and A5 assemblies as described in steps 3 through 6 under “Procedure 5. A2, A3, A4, and A5 Assemblies Removal.”...
Page 166 Procedure 10. Al6 Fast ADC and Al7 CRT Driver 1. Connect W7, W8, W9, A6AlW2, and AlSWl to the Al7 CRT driver assembly. Place the assembly into the center-deck mounting slot next to the CRT assembly. 2. For Option 007 spectrum analyzers: Connect all Al6 assembly cables as illustrated in Figure 4-21 which shows the left side frame removed so that proper Al6 assembly cable routing may be viewed.
Page 167 Procedure 11. Bl Fan Always disconnect the power cord from the instrument before beginning this replacement procedure. Failure to follow this precaution can present a shock hazard which may result in personal injury. 1. Remove the four screws securing the fan assembly to the rear frame. 2.
Page 168 Procedure 12. ET1 Battery Procedure 12. BTI Battery Battery BTl contains lithium polycarbon monofluoride. Do not incinerate or puncture this battery. Dispose of discharged battery in a safe manner. To avoid loss of the calibration constants stored on the A2 controller assembly, connect the spectrum analyzer to the main power source and turn on before removing the battery.
Page 169 A6AlW3 post-accelerator cable. Make sure that the spectrum analyzer line-power switch is in the off position. 7. Connect a high voltage probe (lOOO:l), such as the HP 34111A to a voltmeter with a 10 megohm input. 8. Connect the clip lead of the probe (ground) to the chassis of the spectrum analyzer.
Page 170 Procedure 13. Rear Frame/Rear Dress Panel 15. Remove the two flathead screws securing the rear panel battery assembly, and remove the assembly. Remove the battery and unsolder the two wires attached to the battery assembly. 16. Use a 9/16-inch nut driver to remove the dress nuts holding the BNC connectors to the rear frame.
Page 171 One end of the cover fits into a slot provided in the rear frame assembly. Ensure that the extended portion of the cover shield is seated in the shield wall groove. See Figure 4-23. 15. Connect the HP-IB cable to A2J5. 16. Fold the A2, A3, A4, and A5 assemblies into the spectrum analyzer as described in procedure 5.
Page 172 Procedure 13. Rear Frame/Rear Dress Panel Figure 4-23. A6 Power Supply Cover Assembly Replacement 4-47...
Page 173 A6AlW3 post-accelerator cable. Make sure that the spectrum analyzer line-power switch is in the off position. 6. Connect a high voltage probe (lOOO:l), such as the HP 34111A to a voltmeter with a 10 megohm input. 7. Connect the clip lead of the probe (ground) to the chassis of the spectrum analyzer.
Page 174 Figure 4-24. W3 Dress and Connection to A6 Power Supply 19. Remove AlWl and AlWlDSl f rom the line-switch assembly. Let each hang freely. If contact removal tool, HP part number 8710-1791, is available, complete assembly removal by performing “Removal,” steps 20 and 21. If not, skip to “Removal,”...
Page 175 20. With wire cutters, clip the tie wrap holding the cable to the contact housing, From the top side of the spectrum analyzer, use contact removal tool, HP Part Number 8710-1791, to remove the four wires from the W3 connector. See Figure 4-26.
Page 176 Procedure 14. W3 Line Switch Cable STANDOFF Figure 4-25. Line-Switch Mounting Screw and Cable Dress Assembly Replacement 4-5 1...
Page 177 Procedure 14. W3 Line Switch Cable CONNECTOR P O S I T I O N O F T I E W R A P K N U C K L E W I R E ( 9 8 ) W I R E ( 9 2 8 ) W I R E ( 8 ) W I R E ( 9 1 8 ) PLUNGER PUSHES CONTACT OUT...
Page 178 Procedure 14. W3 Line Switch Cable 3. From the bottom side of the spectrum analyzer, insert the contact end of W3 through the slotted opening in the main deck. W3 should come through to the top side of the spectrum analyzer between the Al8 CRT assembly and the post-accelerator cable. 4.
Page 179 Procedure 14. W3 Line Switch Cable ( 6 P L A C E S ) ( 6 P L A C E S ) Figure 4-27. Side Frame Mounting Screws 7. On the top side of the spectrum analyzer, redress W3. 8.
Page 180 . The spectrum analyzer will store the contents of the program RAM into the new EEROM. 8. Turn the HP 85623 (LINE) switch off, then on, cycling the spectrum analyzer power. Allow the power-on sequence to finish. 9. If error message 701, 702, or 703 is displayed, press [m), MORE, and RECALL ERRORS.
Page 181 Procedure 16. A21 OCXO 1. Remove the rear frame assembly as described in “Procedure 13. Rear Frame/Rear Dress Panel Removal,” steps 1 through 20. 2. Place the spectrum analyzer on its right side frame. 3. Fold out the Al4 and Al5 assemblies as described in “Procedure 9. Al4 and Al5 Assemblies Removal,”...
Page 182 Procedure 16. A21 OCXO 1. Connect W49, coax 82, to the OCXO and position the OCXO in the spectrum analyzer. Dress W50, orange cable, next to W49 through the opening in the deck. 2. Secure the OCXO to the spectrum analyzer main deck using three screws (1). See Figure 4-28.
Page 183: Manufacturers Code List
No maximum or minimum on any mail order. (There is a minimum order amount for parts ordered through a local HP office when the orders require billing and invoicing.) Prepaid transportation. (There is a small handling charge for each order.) To provide these advantages, a check or money order must accompany each order.
Page 184 5. A five-digit code indicating a typical manufacturer of the part. 6. The manufacturer part number. Firmware-Dependent Part Numbers Refer to the firmware note entitled HP 8560 Series, HP 85620A, and HP 85629B Firmware Note, included with each HP 8560E-Series spectrum analyzer. 5-2 Replaceable Parts...
Page 185 Table 5-1. Reference Designations, Abbreviations and Multipliers REFERENCE DESIGNATIONS Assembly Fuse Thermistor Attenuator, Isolator, Filter Switch Limiter, Termination Circulator Transformer Fan, Motor Electrical Connector TB Terminal Board Battery (Stationary Portion), TC Thermocouple Capacitor Jack Test Point Coupler Relay Integrated Circuit, Diode, Diode Coil, Inductor Microcircuit...
Page 186 Table 5-1. Reference Designations, Abbreviations, and Multipliers (2 of 4) ABBREVIATIONS DAP-GL Diallyl Phthalate Current Gain J F E T Junction Field Glass Bandwidth Product Effect Transistor Double (Transition DCDR Decoder Frequency), Feet, Degree Foot D-HOLE D-Shaped Hole F X D F i x e d Kelvin, Key, Diameter Kilo, Potassium...
Page 187 Table 5-l. Reference Designations, Abbreviations, and Multipliers (3 of 4) ABBREVIATIONS PLSTC Plastic Subminiature, Panel A Type (Threader Nano, None P N P Positive Negative Connector) N-CHAN N-Channel Positive (Transistor) SMB Subminiature, Nanohenry POLYC Polycarbonate B Type (Slip-on Nanometer, POLYE Polyester Connector) Nonmetallic P O T...
Page 188 Multiple tera micro nano kilo deka femto 1 0 - i 1 0 - i ” Table 5-2. Manufacturers Code List HP 8560 E-Series Spectrum Analyzer Component Refer to the Manufacturers Code List in the Level Information. 5-6 Replaceable Parts...
Page 189 Table 5-3. Replaceable Parts Reference Description Designation Number ACCESSORIES SUPPLIED TERMINATION-COAXIAL SMA; 0.5W; 5052 2003-6113-02 ADAPTER-COAX F-BNC M-N 1250-0780 HP 10502A HP 10502A WRENCH-HEX KEY AWML4 8710-1755 OPTION 908 RACK KIT WITH FLANGES 5062-0800 (Includes Parts Listed Below) PANEL-DRESS 5001-8739...
Page 190 Table 5-3. Replaceable Parts (continued) Reference HP Part Description Designation Number Code Number 2848C SCREW-MACH M3.5 x 0.6 GMM-LG 0515-1241 6 SCREW-MACH M5 x 0.8 12MM-LG PAN-HD 0515-124 0515-1331 5 2848C SCREW-METRIC SPECIALTY M4 x 0.7 THD; 7MM 0515-133 2848C 5061-9501 FRONT HANDLE ASS’Y...
Page 191 Table 5-3. Replaceable Parts (continued) Reference HP Part Description Designation N u m b e r D Code Number 08562-60140 BD AY-KEYBOARD 28480 08562-6014C 5062-8259 CABLE ASSEMBLY, RIBBON, 28480 5062-8259 KEYBOARD (AlAlJl to A3J602) 0960-0745 RPG ASSEMBLY (Includes Cable) 28480 0960-0745...
Page 192: Replaceable Parts
TUBE, CRT 6.7 IN CABLE ASSEMBLY, TWO WIRE, TRACE ALIGN (P/O A18MP1, A17J5 to A18Ll) 08562-60042 7 2848C 08562-60042 HP-IB ASSEMBLY 2848C 5061-9031 5061-9031 CABLE ASSEMBLY, RIBBON, HP-IB 5062-7755 2848C 5062-7755 BATTERY ASSY (Includes W6) 5063-0245 28480 5063-0245 OCXO 10.0 MHz Standard...
Page 193 Table 5-3. Replaceable Parts (continued) Reference HP Part Description Designation Number Code Number ASSEMBLY SHIELDS (continued) 5063-0220 28480 5063-0220 A4 Assembly AMP 1 (BOTTOM) 5063-0221 28480 5063-0221 AMP 1 (TOP) 28480 5063-0219 5063-0219 AMP 2 (TOP) 5063-0222 28480 5063-0222 AMP 2 (BOTTOM)
Page 194 Table 5-3. Replaceable Parts (continued) Reference HP Part Description Designation Number Code Number CABLE ASSEMBLIES 28480 8120-5682 8120-5682 POWER CABLE, RIBBON 28480 5061-9025 5061-9025 CONTROL CABLE, RIBBON 5062-0728 28480 5062-0728 CABLE ASSEMBLY LINE SWITCH 28480 5061-9033 5061-9033 CABLE ASSEMBLY, RIBBON, OPTION...
Page 195 Table 5-3. Replaceable Parts (continued) Reference HP Part C Qty Description Mfr Mfk Part Designation Number D Code Number CABLE ASSEMBLIES (CONTINUED) 8120-5676 0 CABLE ASSEMBLY, A10 RYTHM DRIVE 28480 8120-5676 5062-0721 8 CABLE ASSEMBLY, COAX 97, LO SWEEP 28480 5062-0721 0.5 V/GHz (A14J7 to Rear Panel 58)
Page 196 Table 5-3. Replaceable Parts (continued) Reference HP Part C Qty Description Designation Number D Code Number CABLE ASSEMBLIES (CONTINUED) 5022-0183 3 CABLE ASSEMBLY, SEMI-RIGID, 1ST LO 28480 5022-018: (AllJ2 to A7Jl) 28480 5022-108: w 3 9 5022-1081 CABLE ASSEMBLY, SEMI-RIGID, 1ST MIXER...
Page 197 TOP VIEW BOTTOM VIEW Figure 5-1. Parts Identification, Assembly Mounting HP Part Description Number Number SCREW-MACH M3 X 30MM-LG PAN-HD TORX 0515-1349 0515-1349 SCREW-MACH M3 X GOMM-LG PAN-HD TORX 0515-2310 0515-2310 0515-3208 SCREW-MACH M3 X lOOMM-LG PAN-HD TORX 0515-2308 0515-2332...
Page 198 Parts List, Cover Assembly Item HP Part Description Code Number Number BAIL HANDLE 5041-8911 28480 5041-8911 5041-8912 TRIM CAP 28480 5041-8912 SCREW MACH M4 X lOMM-LG PAN-HD 0515-1114 0515-1114 28480 1460-2164 SPRING-CPRSN .845 IN-OD 1.25-lN-OA-LG 28480 1460-2164 28480 5021-6343 5021-6343...
Page 199 Parts List, Main Chassis HP Part Description Item Number Code Number 0515-2145 SCREW-MACH M3 X 8MM-LG PAN-HD TORX 28480 0515-2145 SCREW-MACH M3 X 35MM-LG PAN-HD TORX 28480 0515-1715 0515-1715 0380-2052 SPACER .937LG .166ID 28480 0380-2052 5002-1010 COVER, A6 POWER SUPPLY (Includes label) 28480 5002-1010 SCREW-MACH M3 X 0.5 45MM-LG TORX...
Page 200 Parts List, RF Section Item HP Part C Description N u m b e r D Code Number 0515-1032 3 SCREW-MACH M3 X GMM-LG PAN-HD TORX 28480 0515-1032 0515-2332 8 SCREW-MACH M3 X GMM-LG PAN-HD TORX 28480 0515-2332 0515-2332 8...
Page 201 28480 08561-00016 08563-00009 7 08563-00009 7 FRONT PANEL-DRESS (Standard) (HP 85633) 28480 08563-00009 08563-00010 0 08563-00010 0 28480 08563-00010 FRONT PANEL-DRESS (Option 006) (HP 85633) 5060-0467 6 5060-0467 6 PROBE POWER JACK 28480 5060-0467 0590-1251 6 0590-1251 6 NUT-SPCLY 15/32-32-THD .l-IN-THK .562-WD...
Page 202 Parts List, Front Frame (continued) Item Description Code Number 00000 NUT-HEX-DBL-CHAM 3/8-32-THD .094IN-THK DESCRIBE RF INPUT ASSEMBLY (Standard) 28480 5086-7895 RF INPUT ASSEMBLY (Option 026) 28480 SCREW-MACH M3 X 0.5 8MM-LG PAN-HD TX 28480 0515-2145 RUBBER KEYPAD (INCLUDES KEYCAPS) 28480 5041-8985 1990-1131 LED-LAMP LUM-INT=560UCD IF=SOMA-MAX...
Page 203 Parts List, Rear Frame Item HP Part C Qty Description Number D N u m b e r Code 0515-1946 8 SCREW-MACH M3 GMM-LG FLH-HD TORX 28480 0515-1946 5062-7755 3 BATTERY HOLDER (INCLUDES WIRES) 28480 5062-7755 0515-2216 7 SCREW-MACH M4 40MM-LG PAN-HD TORX...
Page 204 F i g u r e 5 - 2 . P a r t s I d e n t i f i c a t i o n , C o v e r A s s e m b l y - I -...
Page 205 F I G U R E 5 - 3 . P A R T S I D E N T I F I C A T I O N , M A I N C H A S S I S...
Page 206 8 5 6 2 E ( 4 & E S ) ( 4 & E S ) NOTES: from the Al0 assembly. If these brackets are removed and reinstalled, the performance of A10 will be altered. A new or rebuilt A10 assembly includes new mounting brackets already attached to it.
Page 207 8 5 6 2 E F i g u r e 5 - 5 P a r t s I d e n t i f i c a t i o n , F r o n t F r a m e...
Page 208 - I - 8 5 6 2 E F i g u r e 5 - 6 . P a r t s I d e n t i f i c a t i o n , R e a r F r a m e - I -...
Page 209 Figure 6-5. Bottom View (Al5 Unfolded) Figure 6-6. Bottom View (Al5 and Al4 Unfolded) Figure 6-7. Al6 Fast ADC (Option 007) Figure 6-8. HP 8562E Front End Figure 6-9. Rear View Use the list below to determine the figure(s) illustrating the desired assembly or cable.
Page 210 A19 HP-IB ........
Page 211 Cables ............W34 first LO Samp.
Page 212 A l 4 A l 5 S K 1 5 5 Figure 6-1. Hinged Assemblies BLUE ( T O A 2 I N N O N - O P T I O N 0 0 7 T O A l 6 I N O P T I O N 0 0 7 ) GREEN w 5 4 YELLOW...
Page 213 w 5 1 S K 1 5 7 Figure 6-3. Top View (A2 and A3 Unfolded) Major Assembly and Cable Locations 6-5...
Page 214 ORANGE W H I T E w 2 9 V I O L E T A 1 9 A l 6 A l 7 A l 8 Figure 6-4. Top View (A2, A3, A4, and A5 Unfolded) 6-6 Major Assembly and Cable Locations...
Page 215 w 4 9 w 3 5 w 3 4 w 2 2 w 3 1 w 3 7 A l 5 w 5 1 NOT I JSED w 3 3 Figure 6-5. Bottom View (Al5 Unfolded) Major Assembly and Cable Locations 6-7...
Page 216 ( O P T I O N 0 0 5 ) W I 0 w 3 4 w 3 2 WI 1 A 1 4 A l 5 Figure 6-6. Bottom View (Al5 and Al4 Unfolded) 6-8 Major Assembly and Cable Locations...
Page 217 w 5 9 C O A X a 3 9 C O A X 6 Figure 6-7. Al6 Fast ADC (Option 007) Major Assembly and Cable Locations 6-9...
Page 218 4 5 w 3 9 A l 3 WI 1 Figure 6-6. HP 6562E Front End 6-10 Major Assembly and Cable Locations...
Page 219 F L .4 SK162 Figure 6-9. Rear View Major Assembly and Cable Locations 6-l 1...
Page 220 General Troubleshooting Introduction This chapter provides information needed to troubleshoot your spectrum analyzer to one of the six major functional sections. Chapters 8 through 13 cover troubleshooting for each of these sections. Before troubleshooting, read the rest of this introduction. To begin troubleshooting, refer to “Troubleshooting to a Functional Section”...
Page 221 The test jack is a collection of test points located on a 16-pin jack. There are approximately 20 test jacks used throughout the spectrum analyzer. The HP 85629B test and adjustment module uses the spectrum analyzer test jacks during diagnostic and adjustment procedures.
Page 222 T E S T P O I N T S O N B L O C K D I AGRAM T P 2 T E S T P O I N T S O N C I R C U I T B O A R D A S S E M B L Y J 4 ( T E S SK163 Figure 7-1.
Page 223 . 5 0 4 9 . - 1 5 ” POWER FOR CONTROLLER . 4 6 INE T R I G . 5 AND INTERFACE a . +sv . 4 4 ONLY . 4 2 . 4 0 l 38 D GND D GND .
Page 224 R E A R P A N E L J 3 LDPT STROBE 4 9 . D GND 4 7 . +2av 45 . 4 3 . fl5VF LHALT O P T I O N IRO . 3 9 . L O P T I / O 3 7 0 LOPT PROG OA15...
Page 225 The jumper on A2J12 is shipped from the factory in the WR PROT (write protect) position (jumper on pins 2 and 3). When the jumper is set to the WR ENA (write enable) position (jumper on pins 1 and 2), an additional service cal data menu is displayed under [CAL). Figure 7-3 illustrates those areas of the service cal data menu that are available.
Page 226 LO FREQ SAMPLER FREO SAMPLER HARMONIC FRAC N POSTSCLR RAW OSC C A L 3RD AMP GAIN EXT MXR REF CAL PREV MENU apply to the HP6561E/HP8563E only. BAND 1 MXR BLAS key applies to HP8561 E only. Figure 7-3. Service Cal Data Menu General Troubleshooting 7-7...
Page 227 Troubleshooting to a Functional Section 1. Refer to Table 7-l for the location of troubleshooting information. 2. If the HP 85629B test and adjustment module (TAM) is available, refer to “The TAM (Test and Adjustment Module)” in this chapter. 3. If error messages are displayed, refer to “Error Messages” in this chapter. You will find both error descriptions and troubleshooting information.
Page 228 Chapter 11. Synthesizer Section Chapter 12. RF Section Chapter 13. Display/Power Supply Section Al7 CRT driver Chapter 13. Display/Power Supply Section Al8 CRT A19 HP-IB Chapter 10. Controller Section Chapter 11. Synthesizer Section A21 OCXO Chapter 12. RF Section General Troubleshooting 7-9...
Page 229 The TAM I/F SW requires an HP 9000, Series 200 or Series 300 controller and an HP BASIC operating system as described in the instructions for using the Frequency Response Adjustment Software in Chapter 3, “Frequency Response Adjustment Software.”...
Page 230 Data files and system mass storage files The TAM I/F SW program creates a data file for each HP 85623 it is used with. This data file contains the original ID string and serial number of the spectrum analyzer. The filename is in the form: “HP62Exxxxx”, where xxxxx is the last five digits of the spectrum analyzer...
Page 231 The TAM functions are now available and are listed, along with any limitations. For example, if Automatic Fault Isolation were selected from the Diagnostics Menu, the ID string would be changed to HP8561E. For an HP 85613, all TAM diagnostics can be used on an HP 85623, except for Manual Probe Troubleshooting.
Page 232 A2 controller assembly and executing the manual probe diagnostics. If either of the tests fail, the TAM is malfunctioning and should be serviced. It is possible to use the TAM manual probe troubleshooting without a display if an HP-IB printer is available. Refer to Chapter 13, “Display/Power Supply Section,” for more information.
Page 233 Automatic fault isolation (AFI) is designed to isolate most faults to one or two assemblies. AFI can be run with the spectrum analyzer cover in place and requires only the CAL OUTPUT signal as a stimulus. The entire procedure takes less than 2 minutes to complete if no failures are found.
Page 234 These areas can sometimes be checked by looking at another TAM connector, but usually require manual troubleshooting techniques to isolate the problem further. If an HP-IB printer is connected, press Print Page to provide a hard copy of the currently displayed screen (the softkey labels will not be printed).
Page 235 RF path.) An external microwave source with a frequency range of 5 GHz to 13.2 GHz is required. The source is not controlled over HP-IB. The user is prompted by the TAM to set the source to 5 GHz at -10 dBm. (The TAM expects -10 dBm at the input of the spectrum analyzer;...
Page 236 Error Messages The spectrum analyzer displays error messages in the lower right-hand corner of the display. A number, or error code, is associated with each error message. These error messages alert the user to errors in spectrum analyzer function or use. Multiple error messages may exist simultaneously.
Page 237 6. If an error message is still displayed, refer to the list of error messages below for an explanation of the error messages. System Analyzer Programming Errors (100 to 150) HP 8560 E-Series Spectrum Analyzer User’s Guide Refer to the for information on programming the spectrum analyzer.
Page 238 120 NOP ONOF ON/OFF are not valid arguments for this command. 121 NOP ARG AUTO/MAN are not valid arguments for this command. 122 NOP TRC Trace registers are not valid for this command. 123 NOP ABLK A-block format not valid here. I-block format not valid here.
Page 239 499 are present, suspect the 10 MHz reference, the A21 OCXO, or on the Al5 assembly (Option 103). These errors do not apply to the hardware in an HP 8560 E-Series spectrum analyzer. If they occur in an HP 8560 E-Series spectrum analyzer, suspect a problem with the...
Page 240 DAC is adjusted to bring OFFSENSE within the proper range. ERR 302 is set if this cannot be accomplished. This error is not applicable to HP 8560 E-Series spectrum analyzers. If it occurs in an HP 8560 E-Series spectrum analyzer, suspect a problem with the model number identification in the spectrum analyzer firmware.
Page 241 MAINSENSE to 0 volts with the loop opened. ERR 312 is set if the fine adjust DAC cannot bring MAINSENSE to 0 volts. This error is not applicable to HP 8560 E-Series spectrum analyzers. If it occurs in an HP 8560 E-Series spectrum analyzer, suspect a problem with the model number identification in the spectrum analyzer firmware.
Page 242 MAINSENSE. ERR 314 is set if the slope of this ramp is 0. This is an indication of an unlocked main roller loop or lack of a sweep ramp. This error is not applicable to HP 8560 E-Series spectrum analyzers. If it occurs in an HP 8560 E-Series spectrum analyzer, suspect a problem with the model number identification in the spectrum analyzer firmware.
Page 243 If error codes 333 and 499 are also present, suspect the 10 MHz reference, the A21 OCXO, or the Al5 assembly (Option 103). These errors do not apply to the hardware in an HP 8560 E-Series spectrum analyzer. If they occur in an HP 8560 E-Series spectrum analyzer, suspect a problem with the model number identification in the spectrum analyzer firmware.
Page 244 DAC cannot bring MAINSENSE to 0 volts. This error is not applicable to HP 8560 E-Series spectrum analyzers. If it occurs in an HP 8560 E-Series spectrum analyzer, suspect a problem with the model number identification in the spectrum analyzer firmware.
Page 245 “LO Re-Align” is executed. Fractional N PLL (337) This error indicates an unlocked fractional N phase locked loop. This error only applies to the hardware in an HP 8560 E-Series spectrum analyzer. 337 FN UNLK Fractional N circuitry is unable to lock.
Page 246 These errors are generated when the YTO loop error voltage will not stabilize at an acceptable value during the YTO loop locking routines. These errors only apply to the hardware in an HP 8560 E-Series spectrum analyzer. 351 SETL FLD YTO error voltage is not settling.
Page 247 SPAC CAL The start bucket correction is out of range. This error indicates a possible failure of the sweep generator on the Al4 frequency control assembly. Refer to “Sweep Generator Circuit” in Chapter “Synthesizer Section.” 361 SPAC CAL The percent of span correction is out of range. This error indicates a possible failure of the sweep generator on the Al4 frequency control assembly.
Page 248 404 AMPL 10K Unable to adjust amplitude of 10 kHz resolution bandwidth. Errors 405 to 416: When these 10K resolution bandwidth (RBW) error messages appear, use the following steps to check for errors 581 or 582. 1. Press [LINE to turn spectrum analyzer off. 2.
Page 249 415 RBW 1OK Unable to adjust 10 kHz resolution bandwidth in third crystal pole. 416 RBW 1OK Unable to adjust 10 kHz resolution bandwidth in fourth crystal pole. 417 RBW 3K Unable to adjust 3 kHz resolution bandwidth in first crystal pole. 418 RBW 3K Unable to adjust 3 kHz resolution bandwidth in second crystal pole.
Page 250 449 RBW 10K 10 kHz resolution bandwidth amplitude low in fourth crystal pole. IF SYSTM IF hardware failure. Check other error messages. IF hardware failure. Check other error messages. 451 IF SYSTM IF hardware failure. Check other error messages. IF SYSTM Unable to adjust step gain amplifiers.
Page 251 489 RBW 100 Unable to adjust 100 Hz resolution bandwidth. 490 RBW 100 Unable to adjust 100 Hz resolution bandwidth. 491 RBW C300 Unable to adjust the resolution bandwidths less than 300 Hz. Crystal sweep gain problem. 492 RBW 300 Unable to adjust 300 Hz resolution bandwidth.
Page 252 502 AMPL .3M Unable to adjust amplitude of 300 kHz resolution bandwidth. 503 AMPL 1M Unable to adjust amplitude of 1 MHz resolution bandwidth. 504 AMPL 30K Unable to adjust amplitude of 30 kHz resolution bandwidth. 505 AMPL Unable to adjust amplitude of 100 kHz resolution bandwidth. 506 AMPL Unable to adjust amplitude of 300 kHz resolution bandwidth.
Page 253 526 RBW (300 ADC timeout during IF ADJUST of <300 Hz resolution bandwidth. 527 RBW <300 Step gain correction failed for <300 Hz resolution bandwidth. Check narrow bandwidth SGO attenuator. 528 RBW <300 Calibration of dc level at ADC failed for <300 Hz resolution bandwidth.
Page 254 559 LOG AMPL Unable to adjust amplitude of log scale. Unable to adjust amplitude of log scale. 560 LOG AMPL Unable to adjust amplitude of log scale. Possible problem in second 561 LOG AMPL step gain. 562 LOG AMPL Unable to adjust amplitude of log scale. Possible problem in second step gain.
Page 255 582 AMPL Unable to adjust 100 kHz resolution bandwidth and resolution bandwidths less than or equal to 10 kHz. Bad CALOSC Calibration in Sweep Rate. Test the 100 kHz resolution bandwidth filter 3 dB bandwidth as follows: 1. Connect the CAL OUTPUT signal (A4J8) to the INPUT 500. 2.
Page 256 Chapter 10, “Controller Section.” Although some of these errors might result in a blanked display, it is possible to read these errors over HP-IB. Refer to “Troubleshooting to a Functional Section” in this chapter. The EEROM on A2 is used to store data for frequency response correction, elapsed time, focus, and intensity levels.
Page 257 HP part number. Refer to Chapter 5, “Replaceable Parts.” Although some of these errors might result in a blanked display, it is possible to read these errors over HP-IB. Refer to “Troubleshooting to a Functional Section” in this chapter.
Page 258 RAM Check Errors (711 to 716) The instrument power-on diagnostics check the program RAM. This includes the two RAMS used for STATE storage. If any STATE information is found to be invalid, all data in that RAM is destroyed. A separate error code is generated for each defective program RAM. All RAM is battery-backed.
Page 259 760 NO FADC commands. These error codes are reserved for option modules, such as the HP 85629 test and adjustment module and the HP 85620A mass memory module. Refer to the option module manual for a listing of error messages.
Page 260 These error codes indicate user-generated errors. 900 TG UNLVL Tracking generator output is unleveled. 901 TGFrqLmt Tracking generator output unleveled because START FREQ is set below tracking generator frequency limit (300 kHz). 902 BAD NORM The state of the stored trace does not match the current state of the spectrum analyzer.
Page 261 Block Diagram Description The spectrum analyzer is comprised of the six main sections listed below. See Figure 7-4. The following descriptions apply to the simplified block diagram and overall block diagram located at the end of this chapter. Assembly level block diagrams are located in Chapters 8 through 13.
Page 262 The RF section includes the following assemblies: A7 SLODA (switched LO distribution amplifier) A8 low band mixer A9 input attenuator A10 YIG-tuned filter/mixer (RYTHM) All YTO (YIG-tuned oscillator) Al3 second converter Al4 frequency control assembly (also in synthesizer section) Al5 RF assembly (also in synthesizer section) The RF section converts all input signals to a fixed IF of 10.7 MHz.
Page 263 A9 Input Attenuator The attenuator is a 500 precision, coaxial step attenuator. Attenuation in 10 dB steps from 0 dB to 70 dB is accomplished by switching the signal path through one or more of the three resistive pads. The attenuator automatically sets to 70 dB when the spectrum analyzer turns off, providing ESD protection.
Page 264 Third Converter (part of A15) The third converter down-converts the 310.7 MHz IF to 10.7 MHz. A PIN-diode switch selects the LO signal used. For normal operation, a 300 MHz LO signal is used. The signal is derived from the 600 MHz reference PLL. During signal identification (SIG ID ON), the 298 MHz SIG ID oscillator is fed to the double balanced mixer on alternate sweeps.
Page 265 The first LO uses four PLLs to phase-lock to the internal 10 MHz standard in the instrument. See Figure 7-5. The reference PLL supplies reference frequencies for the instrument. The three remaining frequency, the instrument microprocessor must set the programmable feedback dividers (N) and reference dividers (R) contained in each PLL.
Page 266 Offset Lock Loop (part of A15) The 285 MHz to 297.2 MHz sampling oscillator is used to sample the YTO. The frequency can be changed by changing the programmable dividers of the offset lock loop. 3.0 - 6.81 GHz 300 MHz , - R E F E R E N C E PLL--, 600 MHz 10 MHz ocxo...
Page 267 The IF section processes the 10.7 MHz output of the RF section and sends the detected video to the ADC/interface section. The following major assemblies are included in this section: A3 interface assembly A4 log amplifier/calibration oscillator assembly A5 IF assembly The spectrum analyzer uses trace-data manipulation to generate the 5 dB/DIV scale from the 10 dB/DIV scale.
Page 268 A5 IF Assembly The A5 IF assembly has four crystal filter poles, four LC filter poles, and step gain amplifiers. The crystal filters provide resolution bandwidths of 300 Hz to 10 kHz. The LC filters provide resolution bandwidths of 30 kHz to 2 MHz. All filter stages are in series. PIN diode switches bypass unwanted stages.
Page 269 BNC connector. A DAC in the trigger circuit sets the video trigger level. The trigger circuit is responsible for setting HSCAN high. The controller section includes the A2 controller assembly and A19 HP-IB assembly. The A2 assembly controls the Al7 CRT driver through W7. The battery on the rear panel provides battery-backup for state and trace storage.
Page 270 Display ASM Much of the miscellaneous digital control is performed by A2UlOO. UlOO functions as the display ASM (algorithmic state machine) and character ROM. It also converts the 16-bit CPU data bus to an 8-bit data bus for the rest of the spectrum analyzer. A6 Power Supply The A6 power supply is switching supply operating at 40 kHz for the low voltages and...
Page 275 The ADC/Interface section includes the AlAl keyboard, AlA RPG (rotary pulse generator), A3 interface, and Al6 fast ADC (Option 007) assemblies. Table 8-l lists signal versus pin numbers for control cable W2. Troubleshooting Using the TAM Automatic Fault Isolation Keyboard/RPG Problems Keyboard Interface RPG Interface Triggering or Video Gating Problems...
Page 276 Trigger 16-Bit Post-Trigger Counter 15-Bit (32 K) C ircular Address Counter Video Trigger Comparator Table 6-1. W2 Control Cable Connections Signal D GND D GND D GND D GND D GND LRF-STB LFC-STB CAL OSC TUNE LLOG-STB VCMON D GND RT PULSE HSCAN D GND...
Page 277 Table 6-1. W2 Control Cable Connections (continued) A GND RF GAIN LO3 ERR A GND LVFC-ENABLE FC ERR A GND YTO ERR A GND SCAN RAMP VIDEO TRIGGER A GND 49” R / T DAC2 R / T DACl * Indicates signal source.
Page 278 Troubleshooting Using the TAM Refer to Chapter 7, “General Troubleshooting,” for information on enabling the TAM for use with the HP 85623 Spectrum Analyzer. When using Automatic Fault Isolation, the TAM indicates suspected circuits that need to be manually checked. Use Table 8-2 to locate the manual procedure.
Page 279: Automatic Fault Isolation References
Table 8-2. Automatic Fault Isolation References Suspected Circuit Indicated by Automatic I?ault Isolation ADC ASM Check ADC ASM ADC MUX Check ADC MUX ADC Start/Stop Control Check ADC Start/Stop Control Automatic Fault Isolation (‘in ihis chap2er) Check Analog Bus Drivers Analog Bus Drivers (in this chapter) Automatic Fault Isolation...
Page 280: Tam Tests Versus A3 Test Connectors
Table 8-3. TAM Tests versus A3 Test Connectors Measured Signal Lines Connector Video Input to Interface Video to Rear Panel Video MUX LOG Offset/LOG Expand Video Filter Buffer Amp. MS3, MS5, OS1 MS5, MS6 Video Peak Detectors ADC MUX MS6, MS7 Variable Gain Amplifier MS7, MS8 Track and Hold...
Page 281 Refer to function block G of A3 Interface Assembly Schematic Diagram in the HP 8560 E-Series Spectrum Analyzer Component Level Information. A pressed key results in a low on a keyboard sense line (LKSNSO through LKSNS7). This sets the output of NAND gate U607 high, generating KBD/RPG-IRQ.
Page 282 9. If LKBD-RESET is incorrect and a pulse is not present at each of. the LKSCN outputs of Refer to function block J of A3 Interface Assembly Schematic Diagram in the HP 8560 E-Series Spectrum Analyzer Component Level Information. high output on U608B. Clockwise RPG rotation results in a low output from U608B. U612A provides the edge to trigger one-shot U423B, which generates a 90 ms pulse.
Page 283 Triggering or Video Gating Problems Refer to function block H of A3 Interface Assembly Schematic Diagram in the HP 8560 E-Series Spectrum Analyzer Component Level Information. The 1 MHz ADC clock provides synchronization in FREE RUN and SINGLE triggering. LINE triggering synchronization originates on the A6 power supply. Trigger MUX A3U613 selects between FREE RUN, VIDEO, LINE, and EXTERNAL trigger sources.
Page 284 Press LTRIG), EJE’SERNAL , then (5) and GATE DN 0FF until ON is underlined. d. Connect a pulse/function generator (such as an HP 8116A) to provide a 5 V peak-to-peak square wave (TTL level) to the spectrum analyzer rear-panel EXT/GATE TRIG INPUT and also (using a BNC tee) to the channel 4 input of the oscilloscope (HP 54501A).
Page 285 f. Press the following keys on the oscilloscope: ......highlight grid connect off on .
Page 286 Preselector Peaking Control (Real Time DAC) Refer to function block H of A3 Interface Assembly Schematic Diagram in the E-Series Analyzer Component Level 8560 Spectrum Information. The spectrum analyzer uses a real-time DAC (R/T DACl) to peak the preselector. 1. Press (PRESET) on the spectrum analyzer and set the span to 0 Hz. 2.
Page 287 Flatness Control (RF Gain DACs) Refer to function block M of A3 Interface Assembly Schematic Diagram in the HP 8560 E-Series Spectrum Analyzer Component Level Information. RF Gain DACs control the Al5 assembly flatness compensation amplifiers. The RF Gain This results in an RF GAIN voltage which is exponentially proportional to the DAC settings.
Page 288 A3 Assembly Video Circuits Voltages from A3JlOl to the A3 Variable Gain Amplifier correspond (approximately) to on-screen signal levels. (One volt corresponds to the top of the screen and zero volts corresponds to the bottom of the screen.) This is true for both log and linear settings except when the spectrum analyzer is in 1 dB/div or 2 dB/d’iv.
Page 289 7 &lo%. Refer to function block X of A3 Interface Assembly Schematic Diagram in the HP 8560 E-Series Spectrum Analyzer Component Level Information. The log scales are modified using a combination of amplification and digital trace manipulation. The video input to the A3 assembly is either 10 dB/div or linear. To obtain the 5 dB/div scale, the CPU manipulates the trace data from the 10 dB/div scale.
Page 290 11. Reconnect W26 to A3JlOl. Refer to function block U of A3 Interface Assembly Schematic Diagram in the HP 8560 E-Series Spectrum Analyzer Component Level Information. 1. Press [-ET) and set the spectrum analyzer controls as follows: Center frequency ..........300MHz Span .
Page 291 [PRESET). Refer to function block V of A3 Interface Assembly Schematic Diagram in the HP 8560 E-Series Spectrum Analyzer Component Level Information. The spectrum analyzer uses digital filtering for 1 Hz to 100 Hz video bandwidths. An RC low-pass filter is used for 300 Hz to 3 MHz video bandwidths. Various series resistances and shunt capacitances switch into the video filter to change its cutoff frequency.
Page 292 3 MHz Refer to function block W of A3 Interface Assembly Schematic Diagram in the HP 8560 E-Series Spectrum Analyzer Component Level Information. The video filter buffer amplifier provides outputs for video trigger, positive and negative peak detectors, and the analog zero-span (sweeps <30 ms). The zero-span video output is terminated in 500 ohms on the A2 Controller assembly.
Page 293 Refer to function blocks Y and Z of A3 Interface Assembly Schematic Diagram in the HP 8560 E-Series Spectrum Analyzer Component Level Information. The following information pertains to the positive peak detector and is applicable to troubleshooting the negative peak detector.
Page 294 Q208 or CR203 or CR204. Refer to function block R of A3 Interface Assembly Schematic Diagram in the HP 8560 E-Series Spectrum Analyzer Component Level Information. 1. Press (“1 on the spectrum analyzer and set the controls as follows: Center frequency .
Page 295 The HROSENFELL signal is valid only when the NORMAL ( rosenfell) detector mode is selected. 1. Remove anything connected to the HP 85613 or HP 85633 front-panel INPUT 500 connector. Press [?iZZ) on the spectrum analyzer and set the controls as follows: Centerfrequency .
Page 296 1. Set the spectrum analyzer to the following settings: Center frequency ..........300MHz Span .
Page 297 The DAC settings cannot be changed from the front panel. Refer to function block AC of A3 Interface Assembly Schematic Diagram in the HP 8560 E-Series Spectrum Analyzer Component Level Information. 1. Press (PRESET) on the spectrum analyzer and set the controls as follows: Center frequency .
Page 298 A3 Assembly ADC Circuits The ADC consists of a 12-bit DAC, 12-bit successive approximation register (SAR), data multiplexers, and data latches. The ADC ASM (algorithmic state machine) controls the ADC. Eight inputs are controlled by the ADC MUX. These include a positive peak detector, negative peak detector, sampled video, scan ramp, YTO error voltage, FC MUX voltages, Cal Oscillator tune voltage, and offset lock error voltage.
Page 299 Refer to function block B of A3 Interface Assembly Schematic Diagram in the HP 8560 E-Series Spectrum Analyzer Component Level Information. The ADC Start/Stop Control determines the start time of all ADC conversions. Multiplexer ASM to start a conversion. 1. Press (PRESET) on the spectrum analyzer and set the following controls: Span .
Page 300 Refer to function block F of A3 Interface Assembly Schematic Diagram in the HP 8560 E-Series Spectrum Analyzer Component Level Information. 1. Press (PRESET) on the spectrum analyzer and set the controls as follows: Span ............. OHz Sweep time .
Page 301 Refer to function block D of A3 Interface Assembly Schematic Diagram in the HP 8560 E-Series Spectrum Analyzer Component Level Information. The ramp counter is used for sweeps with widths greater than 2.0 MHz times N. The analog sweep ramp is compared to the digital ramp counter.
Page 302 Refer to function block N of A3 Interface Assembly Schematic Diagram in the HP 8560 E-Series Spectrum Analyzer Component Level Information. Press (“1 on the spectrum analyzer, and set the controls as follows: Span ............OHz Trigger .
Page 303 U405 (data lines) or U406 (address lines). 17. Remove jumpers. Refer to function block P of A3 Interface Assembly Schematic Diagram in the HP 8560 E-Series Spectrum Level Information. Analyzer Component Analog bus timing (ABT) generates the strobes for the A4, A5, A14, and Al5 assemblies.
Page 304 A4 log amplifier/Cal oscillator assembly. Refer to function block K of A3 Interface Assembly Schematic Diagram in the HP 8560 E-Series Spectrum Analyzer Component Level Information. Interface strobe select generates the various strobes used by circuits on the A3 Interface Assembly.
Page 305 Refer to function block L of the Al6 fast ADC assembly schematic diagram in the HP 8560 E-Series Spectrum Analyzer Component Level Information. The video input scaling amplifiers help provide scaling (10 dB/div, 5 dB/div, 2 dB/div, or 1 dB/div) and buffer the flash video output. When the GAINX2 control line is low, switch the video input (0 - 1 V).
Page 306 Refer to function block I of the Al6 fast ADC assembly schematic diagram in the HP 8560 E-Series Spectrum Analyzer Component Level Information. The flash ADC (U35) converts the analog video signal into 8-bit digital values at a fixed rate of 12 megasamples per second.
Page 307: Lp/Q Truth Table
Refer to function block J of the Al6 fast ADC assembly schematic diagram in the HP 8560 E-Series Spectrum Analyzer Component Level Information. Peak detection or pit (negative peak) detection can be enabled whenever the sample rate is less than 12 MHz (sweep times greater than 50 ps). Peak detection uses the maximum value of all the samples taken within each bucket (between adjacent display points).
Page 308: Control Word At Primary Address (U3 And U4)
Refer to function block A of the Al6 fast ADC assembly schematic diagram in the HP 8560 E-Series Spectrum Analyzer Component Level Information. The Al6 assembly digital interface to the A2 controller assembly consists of an 8-bit bi-directional data bus, one address line, a most-significant byte strobe, and a least-significant byte strobe.
Page 309 Table 8-13. Control Word at Primary Address (U3 and U4) (continued) Mnemonic State Description Bit 2 GAINX2 Turns on X2 log expand amplifier. Controls digital video trigger polarity. Bit 3 VTRIG-POL Negative-edge video trigger. Positive-edge video trigger. Enables sample detection mode. Bit 4 LSAMPLE Sample detection mode disabled.
Page 310 Enables peak detection mode if LSAMPLE (Bit 4) is high. Refer to function block B of the Al6 fast ADC assembly schematic diagram in the HP 8560 E-Series Spectrum Analyzer Component Level Information. The reference clock circuitry takes the 8 MHz CMOS square wave clock from the A2 controller assembly (via W59, coax 839) and triples the frequency to 24 MHz.
Page 311 Refer to function block C of the Al6 fast ADC assembly schematic diagram in the HP 8560 E-Series Spectrum Analyzer Component Level Information. The clock and sample rate generator takes the 24 MHz reference clock signal and generates all of the various clock signals used on the Al6 fast ADC assembly. The sample rate generator consists of CMOS latch U15, CMOS counters U14 and U16, and CMOS flip-flops U7B and counter (l&bit circular address counter) and the 16-bit post-trigger counter are clocked...
Page 312 Refer to function block G of the Al6 fast ADC assembly schematic diagram in the HP 8560 E-Series Spectrum Analyzer Component Level Information. This 15-bit programmable circular counter provides the address lines of the static RAM (U32). The counter consists of U23, U24, U25, and U26. It counts upward from 0 to 32767 and then back to 0 in a circular fashion.
Page 313 Refer to function block M of the Al6 fast ADC assembly schematic diagram in the HP 8560 E-Series Spectrum Analyzer Component Level Information. This 8-bit digital magnitude comparator, U34, compares the digitized samples from the flash ADC (latch U29 output) to the programmed video trigger level. The video trigger level value on IOB2 through IOB7 is latched into the P input (top portion of U34) by the firmware on the A2 controller assembly when the fast ADC is in “read”...
Page 315 H P 8 5 6 0 E - S E R I E S F A S T w 5 9 BLOCK DIAGRAM F R O M I N T E R F A C E A S S E M B L Y V I D E O B U F F E R P E A K , I Tql6...
Page 316 IF Section The IF Section contains the A4 log amplifier/Cal oscillator and A5 IF assemblies. Troubleshooting Using the TAM Troubleshooting the Log Amplifier with the TAM Troubleshooting A5 with the TAM Troubleshooting the Cal Oscillator with the TAM Automatic IF Adjustment Parameters Adjusted Requirements Performance Test Failures...
Page 317 Inadequate CAL OSC AMPTD Range 300 Hz to 3 kHz Resolution Bandwidth Out of Specification Low-Pass Filter Sweep Generator AM/FM Demodulation, Audio Amplifier, and Speaker 9-2 IF Section...
Page 318 Troubleshooting Using the TAM Refer to Chapter 7, “General Troubleshooting,” for information on enabling the TAM for use with the HP 85623 spectrum analyzer. When using Automatic Fault Isolation, the TAM indicates suspected circuits that need to be manually checked. Use Table 9-l to locate the manual procedure. Table 9-2 lists assembly test connectors associated with each Manual Probe Troubleshooting test.
Page 319 Table 9-1. Automatic Fault Isolation References Suspected Circuit Indicated by Automatic Fault Isolation Check Cal Oscillator on A4 Assembly Troubleshooting the Cal Osc with the TAM Check Input Switch on A5 IF Assembly Troubleshooting A5 with the TAM Check Linear Amplifiers on A4 Assembly Linear Amplifiers Check Log Expand on A3 Interface Assembly Refer to “Log Expand”...
Page 320: Tam Tests Versus Test Connectors
Table 9-2. TAM Tests versus Test Connectors Connectc Manual Probe Troubleshooting Te: Measured Signal Lines Video Input to Interface Video to Rear Panel Video MUX Log Offset/Log Expand Video Filter Buffer Amplifier MS3, MS5, OS1 Video Peak Detectors MS5, MS6 ADC MUX Variable Gain Amplifier MS6, MS7...
Page 321: Tam Tests Versus Test Connectors
Table 9-2. TAM Tests versus Test Connectors (continued) Measured Simml Liner Connector Manual Probe Troubleshooting Test Ref 15 dB Attenuator Stage MS2, MS3, MS4 2nd Step Gain Stage MS3, MS4, MS5 MS4, MS5, MS6 3rd Step Gain Stage MS5, MS6, MS7 Fine Atten/Jrd XTL Pole MS6, MS7, MS8 3rd XTAL Pole Stage...
Page 322 ..........A5J9 pin 2 (MS2) Cal fist Troubleshooting Nude. 2. On the HP 85623 spectrum analyzer, disconnect W27 (coax 3) from A5J5 and monitor the output of A5J5 with a second spectrum analyzer.
Page 323 Center frequency ..........4. On the HP 85623 spectrum analyzer, set the cal oscillator to 10.7 MHz by selecting Fixed Tuned to 10.7 MHz .
Page 324: Sweep Width Settings
Table 9-3. Sweep Width Settings Sweep Width Sweep Time Res BW RANGE MA1 Adjusted A4U105 A4U105 A4U105 Pill5 Pin2 20 kHz 5 ms 10 kHz 10 kHz 10 ms 3 kHz 4 kHz 30 ms 1 kHz 2 kHz 15 ms 300 Hz +5 V Automatic IF Adjustment The spectrum analyzer performs an automatic adjustment of the IF Section whenever needed.
Page 325 4. If a -35 dBm signal does not appear, the cal oscillator is probably at fault. The following IF parameters are adjusted in the sequence listed: 1. Amplitude A. Video Offsets: analog (using log amplifier video offset DAC) and digital (applying stored constant to all readings) 1.
Page 326 3. Crystal Bandwidths A. The cal oscillator sweep rate is measured against the 100 kHz resolution bandwidth filter skirt. This result is used in compensating the sweeps used for adjusting the crystal bandwidths. B. 10 kHz resolution bandwidth 1. Center frequency of LC tank that loads the crystal 2.
Page 327 Performance Test Failures Failures in IF-Section-related performance tests may be investigated using the following information. Failure of this performance test indicates a possible problem with the spectrum analyzer IF gain circuits. Assuming no major IF problems causing IF adjustment errors, IF gain problems in the first 50 dB of IF gain (REF LVLs of 0 dBm to -50 dBm with 10 dB ATTEN) are a result of faults on the A5 IF Assembly.
Page 328 HP 85024A, and another spectrum analyzer. If an HP 1120A active probe is being used with a spectrum analyzer having dc coupled inputs, such as the HP 8566A/B, HP 8569A/B and the HP 8562A/B, either set the active probe for an ac-coupled output or use a dc-blocking capacitor between the active probe and the spectrum analyzer input.
Page 329 3. Set the HP 85623 spectrum analyzer to log mode, with a resolution bandwidth of 300 l&z and single sweep. 4. Using the DMM, check the voltage at U503 pin 6. 5. Verify that this level is about -700 mV.
Page 330 A4U201C and A4U201E. The following procedure provides a means of troubleshooting the linear amplifiers: 1. On the HP 85623 spectrum analyzer, press c-1, (SPAS3), ZEXQ SF&N, a), 2. Disconnect W27 (coax 3) from A4J3 and connect the output of a signal generator to A4J3.
Page 331 1. On the HP 85623 spectrum analyzer, press C-1, C-1, 300 m, (SPAN), 100 (Hz), (m), -10 dBm, [WSWP), a and IF BJ OFF . 2. Connect the CAL OUTPUT to the INPUT 500 connector. 3. Disconnect W54 (coax 2) from A4J4. Connect a short SMB to SMB cable from A4J4 to an SMB tee and connect W54 to the tee.
Page 332 5. Connect the VIDEO OUTPUT ( rear panel) of the HP 85623 spectrum analyzer through a 20 dB attenuator and dc block to the input of the HP 8566A/B. Set the sweep time of the HP 8566A/B to 10 seconds.
Page 333 6. Connect the VIDEO OUTPUT ( rear panel) of the HP 85623 spectrum analyzer through a 20 dB attenuator and dc block to the input of the HP 8566A/B. Set the sweep time of the HP 8566A/B to 10 seconds.
Page 334 Refer to function block D of A4 Log Amplifier Schematic Diagram (sheet 2 of 4) in the HP 8560 E-Series Spectrum Analyzer Component Level Information. The input switch switches between log and linear modes. In addition it contains a 20 dB attenuator which is used only in digital resolution bandwidth settings.
Page 335 The gain of A4U508 is nominally 6.8, measuring from pin 3 to pin 8. To check the log offset/gain compensation circuits, inject a +lOdBm signal into J3 with the HP 85623 spectrum analyzer set to log mode. Measure A4U503 pin 3, Vi, (1) and A4U508 pin 3,...
Page 336 The step-gain amplifiers consist of the first step-gain stage, second step-gain stage, and third step-gain stage. These amplifiers provide gain when the HP 85623 spectrum analyzer reference level is changed. The amplifiers also provide gain range to compensate for variations in the IF filter gains, which change with bandwidth and environmental conditions, and band conversion loss in the front end.
Page 337 2. Connect an SMB tee to A5J5, using a short coaxial cable with SMB connectors. 3. Connect one output of the tee to cable W27 (coax 3). 4. Connect an HP 85024A active probe, with a 1O:l divider installed, to the other output of the tee.
Page 338 HP 85623 spectrum analyzer. The IF signature is displayed on the HP 8566A/B display. It may be necessary to experiment with different time intervals between initiating the sweep on the HP 8566A/B and initiating the current IF state adjustment on the HP 85623 spectrum analyzer.
Page 339 D e t a i l e d M K R 5 0 4 . 4 msec - 5 . 0 - 4 3 . 3 0 STEP 5 dB/ STEP 3RD STEP STAGE GAIN SAMPLE CENTER 1 0 . 7 0 0 0 0 0 MHz S P A N 0 Hz R E S B W 3 0 0 kHz VBW 3 0 0 kHz...
Page 340 D e t a i l e d I f A d j u s t S i g n a t u r e ( 3 ) M K R I. 8 3 4 - 1 4 . 6 0 1 0 .
Page 341 D e t a i l e d M K R - 8 4 . 4 0 dBm 1 0 dB/ S A M P L E 1 L C P O L E L C P O L E LC POLE S E T T I N G S P A S T H E R E A R E F O R A U T O M A T I C A D J U S T M E N T O F T H E...
Page 342 1 0 . 0 dBm CENTER 1 0 . 7 0 0 0 0 0 M H z S P A N 0 H z R E S B W 3 0 0 kHz V B W 3 0 0 kHz S K 1 7 8 Figure 9-9.
Page 343 1 0 . 0 dBm SAMPLE CENTER 1 0 . 7 0 0 0 0 0 M H z S P A N 4) H7 R E S B W 3 0 0 kHz V B W 3 0 0 kHz S W P 5 0 0 set S K 1 8 0 Figure 9-11.
Page 344 Center frequency ..........300 MHz 2. On the HP 85623 spectrum analyzer, connect the 300 MHz CAL OUTPUT to the INPUT 3.
Page 345 Center frequency ..........300 MHz 3. On the HP 85623 spectrum analyzer, connect the 300 MHz CAL OUTPUT to the INPUT...
Page 346 4. Inject a -5 dBm, 10.7 MHz signal into A5J3. 5. Monitor the output of A5J5 with another spectrum analyzer. 6. Simultaneously decrease the signal generator output and HP 85623 spectrum analyzer reference level in 10 dB steps down to a -50 dBm reference level.
Page 347 Cal Oscillator (P/O A4 Assembly) The cal oscillator on the A4 assembly supplies the stimulus signal for automatic IF adjustments. Normally, the oscillator operates only during retrace (for a few milliseconds) to adjust part of the IF. (All IF parameters are to be readjusted about every 5 minutes.) With continuous IF adjust ON, a group of IF parameters are adjusted during each retrace period (non-disruptive).
Page 348 (function blocks AA, AB, and AC) or output attenuator (function block AD). 1. Press (LINEI to turn the HP 85623 spectrum analyzer off and then on. The words ADJUST STATUS appear on the display 10 seconds after the instrument is turned on (assuming the rest of the instrument is working correctly).
Page 349 11. The HP 8566A/B screen illustrates frequency versus time of the cal oscillator output sweeps. See Figure 9-16. The slope of the HP 8566A/B 100 kHz resolution bandwidth is used to detect frequency changes. Sweeps that vary (greater than 30 percent) from the...
Page 350 A5 failure. 15. Set the HP 8566A/B controls as follows: Center frequency ......... . . 10.710 MHz Resolution bandwidth .
Page 351 Ou tp u t W a ve f o rm , 3 kHz R e s o l u t i o n Banclwiath CENTER 1 0 . 8 0 0 0 0 0 MHz S P A N 0 HZ VBW i0 kHz SWP 50.0 mssc Figure 9-17.
Page 352 Out put Wavaf orm. 3 0 0 Hz Rasolution B a n d w i d t h - 3 7 . 0 10 08 C E N T E R 10.7i0 000 Mlit SPAN 0 VBW 1 kHz SWP 200 msec Figure 9-19.
Page 353 ..........400 Hz 2. Set the HP 85623 spectrum analyzer controls as follows: Center frequency .
Page 354 3. Adjust the HP 85623 spectrum analyzer reference level and center frequency to display the 400 Hz modulation frequency eight divisions peak-to-peak. 4. On the HP 85623 spectrum analyzer, press (m), B/FM DEMOI), Mf DF,MOD flly, and set the sweep time to 5 seconds.
Page 358 Controller Section The controller section includes the A2 controller assembly, A19 HP-IB assembly, and BTl battery. The presence of a display (graticule and annotation) verifies that most of A2 controller assembly is operating properly. Troubleshooting Using the TAM Blank Display...
Page 359 Troubleshooting Using the TAM Refer to Chapter 7, “General Troubleshooting,” for information on enabling the TAM for use with the HP 85623 Spectrum Analyzer. Table 10-l lists assembly test connectors associated with each Manual Probe Troubleshooting test. Figure 10-l illustrates the location of the A2 test connectors.
Page 360 7. Move the probe cable to A2J202. Press SOFT KEY #I and wait 5 seconds. 9. If a failure is indicated in any of these tests, the fault lies on the A2 controller assembly. To obtain more information: a. Press the step down key, a one less time than the test number. (For example, press it twice for the third test on the list.) b.
Page 361 Refer to function blocks D and I of A2 controller schematic diagram (sheet 1 of 4) in the HP 8560 E-Series Spectrum Analyzer Component Level Information. The line generators convert the digital display information to an analog output suitable to drive the Al7 CRT driver assembly.
Page 362 B L A N K I N G S K 1 9 1 Figure 10-2. Line Generator Output Waveforms Refer to function block J of A2 Controller Schematic Diagram (sheet 1 of 4) in the HP 8560 E-Series Component Level Information. Spectrum Analyzer 1.
Page 363 4. Compare the blanking-circuit input signals at the following test points with those illustrated in Figure 10-3. BLANKING: J202 pin 15 BLANK: U214 pin 12 VECTOR: U214 pin 11 U213 pin 13 5. The waveforms in Figure 10-3 must match the timing of the vectors being drawn. To do this, U215B is used to adjust the leading edge, and U215A is used to adjust the trailing edge.
Page 364 S K 1 9 3 Figure 10-4. Expanded Blanking Waveforms Refer to function blocks D and I of A2 controller schematic diagram (sheet 1 of 4) in the HP 8560 E-Series Spectrum Component Level Information. Analyzer The two line generators are identical circuits, so the following steps apply to both. The X generator is referenced below, with Y generator references in parentheses.
Page 365 1 0 . 0 V/div 0 . 0 0 v 2 0 . 0 us/div 0 . 0 0 0 s INTEGRATE SAMPLE LCHAR VECTOR SK194 Figure 10-5. Switch Driver Waveform LCHAR All of the DAC inputs should change state two or more times within a 5 ms window. If one or more DAC bits are not working correctly, this will effect the entire display, especially the diagonal lines that go from lower left to upper right.
Page 366 12. Figure 10-7 illustrates the waveforms in step 11 expanded to show relative timing. the second and fourth traces are delayed by 5 ms from the first and third. The oscilloscope settings are changed as follows: Sweep time ..........20 ps/div 13.
Page 367 8 0 0 V/div 0 . 0 0 v 1 0 . 0 us/div 0 . 0 0 0 s U 2 0 I A - I T P 2 SK197 Figure 10-6. Normal X/Y Line Generator Waveforms The length of the vector being drawn can effect intensity. U210A, U21OC, and U210D sum the lengths of the X and Y vectors.
Page 368 Refer to function block M of A2 controller schematic diagram (sheet 1 of 4) in the HP 8560 E-Series Spectrum Analyzer Component Level Information. The Z output function block contains the absolute value circuits which determine the intensity of vectors drawn on the display. The vector length is approximated by the sum of the X length and Y length.
Page 369 9. The waveforms should look like those illustrated in Figure 10-10. If the waveform at schematic, sheet 1 of 4). 10. If the waveform at U210D pin 14 is bad, troubleshoot the Z output circuit (function block M of A2 controller schematic, sheet 1 of 4). 11.
Page 370 1. Disconnect W53 from A2J7. 2. Connect the output of a synthesized source, such as an HP 3335A, to A2J7. 3. Set the synthesized source to the following settings: Amplitude ........... . +lO dBm Frequency .
Page 371: Gate Times
Frequency Counter HP 8560 E-Series Spectrum See function block Z of A2 schematic diagram (sheet 4 of 4) in the Analyzer Component Level Information. The frequency counter counts the frequency of the last IF and provides accurate timing signals for digital zero-spans. The circuit also provides timing signals to the A3 interface assembly ADC (analog to digital converter).
Page 372 1. Disconnect W22 from A2J8. 2. If a 10 MHz, TTL-level signal is not present at the end of W22, continue with step 3. If a 10 MHz signal is present at W22, proceed as follows: a. Reconnect W22 to A2J8. b.
Page 373 CRT changed according to the program, the A2 controller assembly is working properly. Refer to Chapter 8, “ADC/Interface Section.” 4. If there was no response over HP-IB, the A2 controller is probably defective. Be sure to also check the A19 HP-IB assembly and A19Wl.
Page 375 Synthesizer Section The synthesizer section includes the A7 switched first LO distribution amplifier, the All YTO, and parts of the Al4 frequency control and Al5 RF assemblies. Simplified and detailed block diagrams for each assembly are located at the end of this chapter. Troubleshooting Using the TAM Troubleshooting Test Setup Confirming a Faulty Synthesizer Section...
Page 376 For further information regarding electrostatic cautions, refer to “Electrostatic Discharge” in Chapter 1, “General Information.” Using an active probe, such as an HP 850248, with a spectrum analyzer is recommended for troubleshooting the RF circuitry. If an HP 1120A active...
Page 377 A l 4 A l 5 FREQUENCY CONTROL R E V I S I O N CONNECTOR) J 2 3 J 1 8 C O N N E C T O R ) Figure 11-l. Al4 and Al5 Test Connectors PIN 2 .
Page 378: Automatic Fault Isolation References
Table 11-2. Automatic Fault Isolation References Suspected Circuit Indicated Manual Procedure to Perform by Automatic Fault Isolation Check the YTO loop Confirming a Faulty Synthesizer Section (steps 12-33) Check first LO Confirming a Faulty Synthesizer Section (steps 9-11) (steps 9-12) Check first LO pretune frequency and amplitude Unlocked YTO PLL (steps 13-17)
Page 379 Table 11-2. Automatic Fault Isolation References (continued) Manual Procedure to Perform Suspected Circuit Indicated by Automatic Fault Isolation (step 8) First LO Span Problems 52 MHz Check offset span accuracy (steps 17-22) Unlocked Reference PLL Check phase/frequency detector (steps 3-7, 14-f9) Unlocked Offset PLL Check path to phase/frequency detector (steps 18-21)
Page 380 Table 11-3. TAM Tests versus Test Connectors Connector Manual Probe Troubleshooting Test Measured Signal Line! Sweep generator Span attenuator DAC Span attenuator switches Sweep + tune mult input amp Sweep + tune mult input switches FAV generator FAV generator 0.5 V/GHz output YTF offset DAC YTF gain and offset input YTF gain DAC...
Page 381: Tam Tests Versus Test Connectors
Table 11-3. TAM Tests versus Test Connectors (continued) Connector Manual Probe Troubleshooting Test Measured Signal Liner Positive 15 volt supply Sampler drive buffer bias Sampling oscillator bias Offset lock drive buffer OFL error voltage Negative 10 volt supply Offset lock loop BW DAC Positive 15 volt supply Offset lock RF buffer IF AMP/limiter bias...
Page 382 Troubleshooting Test Setup Some synthesizer section problems require placing the YTO PLL in an unlocked condition. This is done by moving jumper A14J23 to the TEST position. This grounds the YTO ERROR signal, disabling the ability of the CPU to detect an unlocked YTO. The FM coil driver output is set to its mid-range level causing the YTO to be controlled only by the main coil tune DAC.
Page 383: Center Frequency Tuning Values
If the tune voltage is correct, but the ADC measures the voltage and determines it to be out of specification, troubleshoot the A3 assembly ADC MUX. Table 11-4. Center Frequency Tuning Values HP 85623 sampling Center Frequency (MHz) Oscillator Frequency (MHz) 2156.3...
Page 384 Check First LO (steps 9-11) 9. Connect the CAL OUTPUT to INPUT 50R. 10. Set the spectrum analyzer to the following settings: Center frequency ..........300MHz Span .
Page 385 Trigger ............Single 24. Set the spectrum analyzer and HP 8340A/B frequencies to the combinations listed in Table 11-5 and press (SGLSWP) on the spectrum analyzer.
Page 386 BNC CABLE FREQUENCY COUNTER TEST CABLE A 15’J 10 1 Figure 1 l-4. Sampler and Sampling Oscillator Test Setup 25. At each combination, the frequency counter should measure a sampler IF as shown in Table 11-5. (The sampling oscillator of the offset PLL tunes to the frequencies listed in the table.) If the frequency counter does not read the indicated sampler IF f10 kHz, suspect the Al5 RF assembly.
Page 387: Sampling Oscillator Test Frequencies
Table 11-5. Sampling Oscillator Test Frequencies HP 8340A HP 85633 Offset PLL Counter Reading CW Frequency Center Frequency Sampling Oscillator Freq Sampler IF 6.067000 2156.3 285.000 82.000 6.087000 2176.3 286.364 73.364 2199.5 6.110200 287.500 72.700 6.141000 2230.3 288.462 83.308 799.3 288.889...
Page 388 PRETUNE ALTERNATE DOWN - - I REFERENCE INPUT Figure 11-5. PLL Locked at Wrong Frequency 11-14 Synthesizer Section...
Page 389 An unlocked PLL can be caused by problems inside or outside the PLL. Troubleshoot this problem by working backward from the oscillator as described in the steps below. Numbers in the following text identify items in Figure 11-6. 1. The loop integrator output voltage (1) should be attempting to tune the oscillator to the correct frequency: The voltage at (1) should increase as the frequency increases on all of the PLLs: Measurement Point 1...
Page 390 Check 100 MHz VCXO, tripler, and doubler (steps 1-7) 1. Using an active probe/spectrum analyzer combination, such as the HP 85024A/HP 8566B, measure the tripler output at A15TP700. The tripler output should be +3 dBm f2 dB. 2. If the tripler output is within tolerance, suspect the doubler circuitry. Refer to function block S of the Al5 RF schematic.
Page 391 Check 10 MHz reference to phase/frequency detector (steps 9-14) 9. On the spectrum analyzer, press (mCTRL), REAR PANEL , and 10 MHz INT . 10. Check the 10 MHz reference frequency-accuracy by connecting a frequency counter to warmup period. 11. If a 10 MHz signal >l V peak-to-peak is not present at A15J301, refer to the “10 MHz Reference”...
Page 392 22. To remove the divided-down 100 MHz signal from the phase/frequency detector, short R595. Refer to function block X of Al5 RF schematic. Check the 100 MHz lock loop integrator (steps 23-27) 23. Remove 10 MHz reference input to the phase/frequency detector by pressing (ZKYiKCTRL), REF IN/OUT connector.
Page 393 31. Measure voltage at U507B pin 5 while adjusting R561. This is the temperature- compensated adjustable voltage reference to which the detected voltage is compared. It should vary between +0.15 V and i-O.6 V. 32. Adjust R561 to its limits and verify that the output U507B pin 7 measures approximately Third LO Driver Amplifier The third LO driver amplifier (Q503) amplifies the 300 MHz from the 300 MHz distribution amplifier to a sufficient level to drive the LO port of the double balanced mixer.
Page 394 Unlocked Offset Lock Loop (Sampling Oscillator) The offset lock loop drives the A15UlOO sampler. The offset lock loop sampling oscillator tunes to one of sixteen discrete frequencies between 285 MHz and 297.222 MHz. Refer to Al5 schematic. Mixer A15U400 mixes the oscillator output with 300 MHz from the reference PLL, producing a 3 MHz to 15 MHz IF signal.
Page 395: Sampling Oscillator Pll Divide Numbers
9. If the signal is not measured near the indicated power, troubleshoot the offset lock loop buffer (function block AM of Al5 RF schematic sheet 3 of 4). Table 11-6. Sampling Oscillator PLL Divide Numbers sampling Center Reference Reference Divide Frequency Oscillator Frequency* Chain...
Page 396 13. If the IF signal is not near the indicated power, troubleshoot the loop mixer (function block AI). Check path to phase/frequency detector (steps 14-19) 14. Measure the loop IF signal at the input to the IF amplifier/limiter (function block AK): U411) (end nearest 4 MHz (approximately -6 dBm)
Page 397 Unlocked YTO PLL The All YTO is locked to two other oscillators, the fractional N oscillator and the offset PLL sampling oscillator. For LO spans of 2.01 MHz and above, either the FM or main coil of the YTO is swept directly. For LO spans of 2 MHz and below, the fractional N oscillator is swept. The sampling oscillator remains fixed-tuned during all sweeps.
Page 398 In fractional N spans (LO Spans 12 MHz) the YTO remains locked to the sweeping fractional N PLL. Thus, the sampler IF must always equal the fractional N oscillator frequency (conditions for lock). Since the YTO must always sweep up in frequency, for negative sampler IFS, the fractional N oscillator must sweep from a higher frequency to a lower frequency.
Page 399 1. If the YTO PLL is unlocked, error code 301 should be displayed. Place the spectrum analyzer in ZERO SPAN. Figure 11-7 illustrates the simplified YTO PLL. 2. Move the jumper on A14J23 to connect pins 2 and 3 (TEST position). Refer to Figure 11-l for the location of A14J23.
Page 400 5. Calculate the YTO frequency error by subtracting the frequency recorded in step 3 from the frequency recorded in step 4. Record the result below: YTO Frequency Error = M YTO Frequency Error = YTO Frequency (MEASURED) -YTO Frequency(cALcuLATED) Record the fractional N frequency below: Fractional N frequency = Replacement of the phase/frequency detector chip A14U204 is not recommended.
Page 401 Span ............OHz 14. Monitor the fractional N PLL output at A145304 (FRAC N TEST) with a synthesized spectrum analyzer such as an HP 8568A/B or HP 8566A/B. Refer to function block AI of Al4 frequency control schematic.
Page 402 The fractional N frequency indicated in the FREQ DIAGNOSE menu will be negative when locking to lower sidebands. Refer to function blocks E, M, and N of Al4 frequency control schematic in HP 8560 Spectrum Analyzers Component Level Information E-Series binder.
Page 403: Main Coil Coarse And Fine Dacs Voltages
Table 11-8. Voltages in FM Coil and Main Loop Drivers Voltages Measurement Points 0 Vdc Check main coil coarse and fine DACs (steps 41-44) 41. The main coil coarse and fine DACs correct any initial pretune errors in the YTO main coil.
Page 404 50. If the spectrum analyzer center frequency is 300 MHz, the voltage at A14J18 pin 3 should measure -3.35 V f0.25 V. The voltage may also be determined from the following equation: V = -(first LO Frequency -2.95 GHz) x 2.654 V/GHz 51.
Page 405 100 Hz to 2 MHz range. To determine the fractional N frequency for any given center frequency, press (CAL], is the frequency that will be measured at A14J304 with the HP 85633 in zero span. 1. Set the spectrum analyzer to the following settings: Center frequency .
Page 406 Table 1 l-10. Postscaler Divide Numbers Divide output Input Number Range (MHz) Range (MHz) to 973 to 69.5 60.0 to 987.96 69.5 to 82.33 to 960 to 96.0 823.2 82.33 If the output frequency is wrong by less than 1 MHz, the phase locked loop is not unlocked but still requires repair.
Page 407 Table 1 I-1 1. Unlocked Fractional N Troubleshooting Areas Measured VCO Tune Voltage Frequency Relative to Expected Value Below -4 V About +ll V Above +12.5 V Measured > expected VCO clamp Divider or Divider or VCO clamp integrator integrator Measured <...
Page 409 Table 11-12. Divider and Integrator Troubleshooting Measured VCO TP6 Frequency Frequency Relative to Expected Value zero 2.5 MHz Measured > expected Dividers Dividers Dividers Det or integrator Measured < expected Both Det or integrator Dividers Dividers 10. Divider troubleshooting: a. Check the frequency at A14TP2. It should be equal to the frequency at A14TPl divided by two.
Page 410: Sweep Signal Destination Versus Span
Frequency Span Accuracy Problems The spectrum analyzer employs lock-and-roll tuning to sweep the first LO for spans greater than 2.0 MHz. The first LO is locked to the start frequency immediately after the previous sweep has been completed. The first LO is then unlocked, and, when a trigger signal is detected, the first LO sweeps (rolls).
Page 411 3. Use the following equation to determine the first LO span used. Display Span Setting First LO Span = Current Band Harmonic Mixing Number 4. Refer to Table 11-13 to determine the circuit associated with the span. 1. If all first LO spans or only first LO spans of 2.01 MHz or above are affected, perform the YTO Adjustment procedure in Chapter 2, “Adjustment Procedures.”...
Page 412 For YTO main coil spans, the YTO is locked at the beginning of the sweep and the sweep ramp is summed into the main coil tune driver. 1. Perform the YTO adjustment procedure in Chapter 2, “Adjustment Procedures.” If the YTO adjustments cannot be performed, continue with step 2.
Page 413 Center frequency ..........Span .
Page 414 1. Set the spectrum analyzer to the following settings: Center frequency ..........300MHz Span .
Page 415 During multiband sweeps, the sweep ramp at A14J15 pin 15 should go from 0 V to +lO V for each band or portions of a band covered. See function block A of Al4 frequency control HP 8560 E-Series Spectrum Analyzers Component Level Information schematic in the binder.
Page 416 ..i..I..~..~..~..Figure 11-9. HP 6562E Sweep and Scan Ramps 11-42 Synthesizer Section...
Page 417 Phase Noise Problems System phase noise can be a result of noise generated in many different areas of the spectrum analyzer. When the spectrum analyzer is functioning correctly, the noise can be observed as a function of the distance away (the offset) from the carrier frequency. The major contributor to system noise can be characterized as coming from specific circuit areas depending upon the offset frequency.
Page 418 If the spectrum analyzer has excessive noise at >l kHz offset, measure the noise with center frequencies of 100 MHz and 2.5 GHz. If the measurements are equal, suspect the fractional N circuitry and the YTO loop circuitry on the Al4 frequency control assembly. If the measurements differ by 2 dB to 5 dB, with the 2.5 GHz measurement at a higher noise level, suspect the offset lock loop circuitry.
Page 419 IF circuitry. Continue with the following steps. 9. Set the HP 85633 to the following settings: Center frequency ..........300MHz Span .
Page 420 14. When U104 pin 3 is at TTL low, U104 pin 6 should near -15 Vdc and PIN diodes 15. Set HP 85633 to the following settings: Center frequency ........, ..89.3 MHz Span .
Page 421 The HSCAN signal uses Q2 to reset the ramp. Q2 shorts the integrator and sets its output nominally to ground. A l 4 F R E Q U E N C Y A l l ----- J 5 1 4 . 5 T O 1 8 . 5 dE!m A7 SWITCHED LO TO FRONT PANEL TO A8...
Page 422 - 1 0 T O +5 d&n Y T O L O O P P O S T S C A L E R FRAC N TEST - 1 0 dBm GENERATOR 1406.6 TO 500 MHz TO 1020 MHz F r a c t i o n a l N D i v i d e Figure 1 l-l 1.
Page 423 W34 1ST LO SAMP i FROM A7 SLODA TO FRONT PANEL TO SIG ID OSCILLATOR > - 1 0 d&n LEVELS SAMPLER IF TO A l 4 - 1 0 T O 600 MHz 2 TO TP40 1 - 6 d&r 2 0 M H z DRIVE 0 dh 15 MHz...
Page 424 A21 OCXO The spectrum analyzer uses an oven-controlled crystal oscillator (OCXO). It is deleted in Option 103 and replaced by a temperature-compensated crystal oscillator (TCXO), located on the Al5 RF assembly. Connectors J305 and J306 on the Al5 RF assembly are located where the TCXO would be installed in an Option 103.
Page 427 RF Section The RF Section converts the input signal to a 10.7 MHz IF (Intermediate Frequency). See the detailed block diagram, Figure 12-8. The block diagrams for the Al4 and Al5 assemblies are located in Chapter 11, “Synthesizer Section.” Troubleshooting Using the TAM Low Band Problems High Band Problems Low and High Band Problems...
Page 428 Use of an active probe, such as an HP 85024A, with another spectrum analyzer is recommended for troubleshooting the RF circuitry. If an HP 1120A Active Probe is being used with a spectrum analyzer, such as the HP 8566A/B, HP 8569A/B and the HP 8562A/B, having dc coupled inputs,...
Page 429 Table 12-1. Automatic Fault Isolation References Manual Procedure to Perform Suspected Circuit Indicated by Automatic Fault Isolation Third Converter Check 2nd IF Amplifier Third Converter Check 2nd IF Distribution Third Converter Check 10.7 MHz IF Out of Double Balanced Mixer Calibrator Amplitude Adjustment in Chapter 2 Check 300 MHz CAL OUTPUT A7 SLODA (Switched LO Distribution Amplifier)
Page 430 1. Disconnect 2. Set the HP 85623 to the following settings: Center frequency ..........0 Hz Span .
Page 431 High Band Problems 1. Perform the steps located in “Control Latch for Band-Switch Driver” in this chapter. 2. Troubleshoot the signal path. Refer to the power levels listed in Figure 12-8, HP 85623 RF Section Troubleshooting Block Diagram. Low and High Band Problems displayed, refer to “Error Messages”...
Page 432 Connecting or disconnecting the A7 bias with the HP 85623 LINE switch on will destroy the A7 assembly. Always press LuNE) to turn the HP 85623 off before removing or reinstalling W12 to either the A7 or A14JlO.
Page 433 FLl.) 5. If the level at the input of A8 is less than -25 dBm, suspect FL1 low-pass filter, A10 RYTHM, or A9 input attenuator. Refer to power levels shown on Figure 12-8, HP 85623 RF Section Troubleshooting Block Diagram.
Page 434 A9 Input Attenuator 1. Perform the “Input Attenuator Switching Uncertainty” performance test in Chapter 2, HP 8560 E-Series Spectrum Calibration Guide. “Using Performance Tests,” of the Analyzer 2. If there is a step-to-step error of approximately 10 dB or more, continue with step 3.
Page 435 The Al3 assembly is extremely sensitive to Electrostatic Discharge (ESD). For further information regarding electrostatic cautions, refer to “Electrostatic Discharge” in Chapter 1, “General Information.” 1. Connect the HP 85623 CAL OUTPUT to the INPUT 50R connector. 2. Set the HP 85623 to the following settings: Centerfrequency .
Page 436 Press (LINE to turn spectrum analyzer off. Reconnect W13 to A14J12, and press (LINE) to turn spectrum analyzer on. Set the HP 85623 to the following settings: Center frequency ..........300MH~ Span .
Page 437 Span ............2MHz 2. On the HP 85623, press C-1 and measure the signal power at the output of A7 (see item (1) of Figure 12-3).
Page 438 Span ............. OHz 3. The voltage should measure approximately 0 Vdc (TTL low). 4. Set the HP 85623 center frequency to 3 GHz. 5. The voltage should measure approximately f5 Vdc (TTL high).
Page 439 3.9107 GHz first IF offset between the YTO frequency and the center frequency. This signal is 0.5 V/GHz of tuned frequency and is available at the rear panel. 1. On the HP 85623, press (PRESET), and set the controls to the following settings: Start frequency .
Page 440 Figure 12-4. HP 8582E Rear-Panel LO SWP Output Figure 12-5. HP 8582E Signal at A14J15 Pin 1 9. Check the voltage at A14J15 pin 3 with the spectrum analyzer center frequency set to the frequencies listed in Table 12-4. The following table lists the voltage that should be measured at A14J15 pin 3, the settings for the three switches (U416 in function block Q), and the gain through the Sweep + Tune Multiplier.
Page 441: Sweep + Tune Multiplier Values
11. Set the HP 85623 to the following settings: Center frequency ..........5 GHz Span .
Page 442 3. If adjustment cannot be made, disconnect W35 (coax 92) from A15J801. 4. On the HP 85623, press c-1 and set the controls to the following settings: Center frequency ..........300MHz Span .
Page 443 HP 85024A, and another spectrum analyzer. If an HP 1120A active probe is being used with a spectrum analyzer having dc coupled inputs, such as the HP 8566A/B, HP 8569A/B and the HP 8562A/B, either set the active probe for an ac-coupled output, or use a dc-blocking capacitor between the active probe and the spectrum analyzer input.
Page 444 9. On the HP 85623, press (-1, ICAL), IF BDJ OFF, M#m I OF 2, and FLA’F#ESS . Increase the gain of the flatness compensation amplifiers to maximum by entering 0 using the data keys. This sets the gains in the flatness compensation amplifiers to their maximum values.
Page 445 SIG ID is available only with Option 008. The SIG ID Oscillator provides a shifted third LO (approximately 298 MHz) to distinguish true signals from false signals (such as image or multiple responses). When the HP 85623 is set to SIC ID t3N, the SIG ID Oscillator turns on during alternate sweeps.
Page 446 4. With the SIG ID Oscillator on, measure the frequency at A15X602 with a frequency counter and an active probe. 5. On the HP 85623, press (m) until A15J901 pin 13 is at TTL low. Diodes CR603 and CR605 should be forward biased and CR604 should be reverse biased (approximately 6 Vdc reverse bias).
Page 447 Check for a 10 MHz sine wave greater than or equal to 1 V p-p at J305 (standard HP 85623), or at U302 pin 3 with an oscilloscope (Option 103). 10. If the signal at U304 pin 13 is correct (see Figure 12-7), but there is a problem with the signals at A15J301, A155302, A155303, or A15J304, suspect U303 or U304 in the 10 MHz Distribution circuitry.
Page 448 1.00 V/div -250.000 ns 0.00000 s 250.000 ns 50.0 ns/div Figure 12-7. 10 MHz TTL Reference at U304 Pin 13 12-22 RF Section...
Page 449 Table 12-5 lists the RF Section mnemonics shown in Figure 12-8, and provides a brief description of each. Table 12-5. RF Section Mnemonic Table Description Mnemonic YTF Tune Signal (SYTF or RYTHM) TUNE+, TUNE- YTF Heater Power YTO Main Coil Tune Signal MAIN COIL+, MAIN COIL- FM+, FM- YTO FM Coil Tune Signal...
Page 451 The display/power supply section contains the A6 power supply, A6Al HV module, Al7 CRT signal driver, and Al8 CRT. Figure 13-1 illustrates the section block diagram. Table 13-1 lists versus pin numbers for power cable Wl. Troubleshooting Using the TAM Blank Display (Using the TAM) Blank Display Blanking Signal...
Page 452 FRONT PANEL LED P O W E R S U P P L Y - 1 2 . 6 A S S E M B L Y ; V O L T A G E L I N E L I N E F L 4 F L 4 SE-L-E C fiR...
Page 453 Table 13-l. Wl Power-Cable Connections Signal A GND - 5 v -5 v A GND A GND S C A N R A M P 4 1 A GND -12.6 V -15 v A GND - 1 5 v A GND t 1 5 v t 2 8 v PWR UP...
Page 454: Automatic Fault Isolation References
Troubleshooting Using the TAM Refer to Chapter 7, “General Troubleshooting,” for information on enabling the TAM for use with the HP 85623 Spectrum Analyzer. When using automatic fault isolation, the TAM indicates suspected circuits that need to be manually checked. Use Table 13-2 to locate the manual procedure.
Page 455 Focus DAC test Use the following procedure if your spectrum analyzer has a blank display. This procedure substitutes an HP-IB printer for the display. 1. Connect the printer to the spectrum analyzer and set the printer address to the value required by the TAM (‘t 1 is usually one).
Page 456 2. All of the power-supply indicator LEDs along the edge of the A2 controller assembly should be lit. 3. The rear-panel CRT +llO VDC ON indicator should also be lit. 4. Connect the TAM probe cable to A2Jll. Press (m), SOFT KEY t3, a, SOFT KEY #I. (The top soft key is #l.) 6.
Page 457 5. If all of the power supply indicators along the outside edge of the A2 controller assembly are lit, the A6 power supply is probably working properly. F R O N T V I E W S K 1 1 2 2 Figure 13-3.
Page 458 7. If the signals on A2J202 pins 3, 14, and 15 are correct, troubleshoot the Al7 CRT driver. Display Distortion The HP 85623 spectrum analyzer uses a vector display. The graticule lines, traces, and characters are composed of a series of straight lines (“vectors”) placed end-to-end. If the vectors do not begin and end at the proper points, the display appears distorted, but in focus.
Page 459 Turn off the analyzer and place Al7 in the service position. Connect the ground lead of a high-voltage probe (HP 34111A) to the chassis, and use it with a DVM to measure The nominal A17J7(10) voltage is -1600 Vdc, but the CRT will function if this voltage is within 200 V of -1600 Vdc.
Page 460 13. Verify that the front-panel intensity adjustment when used with the A17R21 Z FOCUS changes the peak-to-peak voltage at TP9 by 25 V. Access the intensity adjustment by pressing (DISPLAY), IEJmS3TY and turning the front panel knob. 14. Set the front-panel intensity to minimum. Set A17R21 Z FOCUS and A17R26 X FOCUS fully counterclockwise.
Page 461 The following measurements should be made with a high-voltage probe, such as the HP 34111A. When using the high-voltage probe, connect the ground lead securely to the spectrum analyzer chassis. 7. Carefully measure the grid voltage at A17J7 pin 6, and the cathode voltage at A17J7 pin 4.
Page 462 A6 Power Supply Assembly Troubleshooting The spectrum analyzer uses a switching power supply operating at 40 kHz to supply the low voltages for most of the analyzer hardware, and a 30 kHz switching supply (CRT supply) to provide the high voltages for the CRT display. The CRT supply will be treated as a separate supply since the remainder of A6 must be operating for the CRT supply to operate.
Page 463 1. Measure the voltage at TP108 to verify the output of the input rectifier. The voltage should be between t215 Vdc and +350 Vdc. 2. If it is not within this range, check the rear panel fuse, input rectifier, input filter, and the rear-panel line voltage selector switch.
Page 464 1. If the line fuse blows with the (LINE) switch off, suspect either the input filter or the power switch cable assembly. 2. If the line fuse blows when the spectrum analyzer is turned on, disconnect the power cord and lift the drain of A6Q102 from TP108. If the line fuse still blows, suspect CR102 through CR105.
Page 465 1. Connect the negative lead of the DVM to A6TP301 and verify the power supply voltages. a. Check A6TP302 for +15 Vdc. b. Check A6TP303 for -15 Vdc. c. Check A6TP304 for +28 Vdc. d. Check A6TP305 for -12.6 Vdc. e.
Page 466 Ideally, the DVM should read the voltage written on the label of the adjustment in Chapter 2, “Adjustment Procedures.” 5. If the DVM does not read approximately +llO Vdc, measure the voltage on 6. If LHVSHUT-DOWN is low, suspect a bad connection along W8 between the A6 power supply and the Al7 CRT driver.
Page 467 7. If the sawtooth is correct, check the base of Q401 for 30 kHz pulses. 8. If the duty cycle is high, but there is no i-110 Vdc, suspect the bridge rectifier, CR401 through CR404. See function block H of A6 power supply schematic diagram in the component-level information binder.
Page 468 See function block D of the A6A2 regulator schematic diagram in the component-level information. The power up circuitry generates the PWR UP signal, which tells the microprocessor that the supplies are up and stable. PWR UP will go high when the +5 Vdc supply exceeds is set low, it will stay low for at least 50 ms before going high, even if the +5 Vdc supply exceeds t4.99 Vdc before 50 ms have elapsed.
Page 471 Component-Level Information Packets (CLIP ). Each CLIP contains a parts list, component-location diagram, and schematic diagram. Each CLIP has an HP part number which is changed whenever the HP part number for its related instrument assembly is changed. Updated or replacement CLIP may be ordered through your local Hewlett-Packard Sales or Service Office using the CLIP part number provided in Table A-l.
Page 472 Table A-l. HP 8562 Spectrum Analyzer Documented Assemblies Board Assembly Instrument Assembly CLIP Part Number Serial Prefix Part Number 3611A and above 08562-60140 A2 Controller Assembly 3611A and above A3 Interface Assembly 3611A and above 08563-60098 A4 Log Amplifier/Cal Osc...
Page 473 Table A-l. HP 8582 Spectrum Analyzer Documented Assemblies (continued) Board Assembly Instrument Assembly CLIP Part Number Serial Prefix Part Number Al5 RF Board (Option 103) 3611A to 3632A 08563-90128 (without SIG ID) 3635A through 3720A 08563-90163 3724A and above Al5 RF Board (Standard)
Page 475 Index replacement, 4- 16 A4 cal oscillator. See cal oscillator 100 MHz oscillator, 11-16 A4 linear amplifier failures, 9-14 10.6952 MHz VCXO troubleshooting, 9-18 A4 log amplifier troubleshooting, 9-13 10.7 MHz and 4.8 kHz IF filter troubleshooting, A5 IF assembly problems, 9-21 9-18 A5 IF section.
Page 476 3-8 Change Entry softkey, 3-12 dual-bus operation, 3-8 character problem, lo-10 getting started, 3-2 chassis parts, 5-17, 5-25 HP-IB addressing, 3-7 components loading software, 3-5 adjustable components table, 2-5 mass storage file, 3-6 computer missing ETE, 3-10...
Page 477 3-12 accessory module error messages 800 to 899, verify HP-IB, 3-12 7-40 controller amplitude error message 582, 7-36 block diagram, lo-17 automatic IF error messages 400 to 599, 7-28 check, 7-14 battery error message 718, 7-39 frequency response adjustment software, 3-2...
Page 478 HP 85629B. See TAM frequency response adjustment HP 85629B test and.adjustment module, l-3 10 MHz reference, 3-4 HP 85629B Test and Adjustment Module, 2-9 alphabetic error messages, 3-16-18 HP 85623 options information, l-2 BASIC binaries, 3-5 HP-IB...
Page 479 Load Conds softkey, 3-12 loading frequency response adjustment software, IF adjustment, automatic , 9-10 IF amplifier, 7-44 local oscillator. See LO IF amplitude adjustments, 2-26 LO control check, 7-15 IF assembly, 7-49 LODA IF assembly troubleshooting, 9-9, 9-21 removal and replacement, 4-30 IF bandpass adjustment, 2-21 troubleshooting, 12-6 IF filter, 4.8 kHz and 10.7 MHz problems, 9-18...
Page 480 mixer/detector log amplifier troubleshooting, CRT, 13-16 9-20 dead, 13-12 high voltage, 13-15 low voltage, 13-15 noise. See phase noise removal, 4-21 replacement, 4-22 restarting, 13-14 section, 7-51 ocxo, 1 l-50 OCXO adjustment, 2-48 troubleshooting, 7-14 OCXO removal and replacement, 4-56 turn-on, 13-18 also offset lock loop, 7-47, 11-20.
Page 481 TCXO adjustment, 2-51 service menu, 7-7 test and adjustment module, 2-9. See also TAM service offices, 1-16 controller, 10-2 service tools, l-4 test and adjustment module, HP 85629B, l-3 setups test descriptions, 3-14-15 software adjustment, 3-4 test equipment, l-9 shipping...
Page 482 adjustment , 2-3 tools required, 4-3 W3 line switch cable trace storage problems, lo-15 removal, 4-48 triggering, 7-50 replacement, 4-52 triggering problems, 8-9 warmup time troubleshooting instrument, 7-8 frequency response adjustment software, 3-3 wire assembly cables, 5-7 write protect/enable jumper, 7-6 unlocked PLL, 11-15 user generated error messages, 7-41 YIG-tuned filter/mixer, 7-44...

HP 8562E Service Manual

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