Page 1 Service Manual HP 8560A Spectrum Analyzer SERIAL NUMBERS Prefix 3207A and Above HEWLETT Eiia PACKARD HP Part No. 08560-90081 August 1992 Printed in USA...
Page 2 @Copyright Hewlett-Packard Company 1990, 1992 All Rights Reserved. Reproduction, adaptation, or translation without prior written permission is prohibited, except as allowed under the copyright laws. 1212 Valley House Drive, Rohnert Park, CA 94928-4999, USA...
Page 3 For warranty service or repair, this product must be returned to a service facility designated by HP. Buyer shall prepay shipping charges to HP and HP shall pay shipping charges to return the product to Buyer. However, Buyer shall pay all shipping charges, duties, and taxes for products returned to HP from another country.
Page 4: Safety Symbols
Safety Symbols The following safety symbols are used throughout this manual. Familiarize yourself with each of the symbols and its meaning before operating this instrument. caution Caution sign denotes a hazard. It calls attention to a procedure which, if not correctly performed or adhered to, could result in damage to or caution destruction of the instrument.
Page 5 Tells you how to install the spectrum analyzer. Tells you what your analyzer’s specifications are. HP 856OA/8561 B/8563A 0 perating and Programming Manual w Tells you how to make measurements with your spectrum analyzer. w Tells you how to program your spectrum analyzer.
Page 6: Table Of Contents
....HP 85629B Test and Adjustment Module Service Kit ......
Page 7 15. External Mixer Amplitude Adjustment ....2-57 16. Second IF Gain Adjustment ....2-60 17.
Page 8 6. General Troubleshooting Introduction ........... . . Assembly Level Text Block Diagrams .
Page 9 6-34 Option Module Errors (800 to 899) ....6-34 User-Generated Errors (902 to 904) ....Block Diagram Description .
Page 10 Track and Hold ......7-21 7-22 A3 Assembly’s ADC Circuits ..... . 7-22 .
Page 11 ....8-34 A4 Assembly’s Cal Oscillator Circuit ... . Cal Oscillator Unlock at Beginning of IF Adjust 8-35 Inadequate CAL OSC AMPTD Range .
Page 12 Unlocked Reference PLL ......lo-42 Operation ......lo-42 Troubleshooting .
Page 13 12. Display/Power Supply Section 12-4 ....Troubleshooting Using the TAM 12-5 ......Blank Display 12-6 .
Page 14 Example of a Static-Safe Workstation ....1-3. HP 8560A Shipping Container and Cushioning Materials ..
Page 15 6-6. Simplified Block Diagram 6-47 ... . 6-7. HP 8560A Overall Block Diagram (Sheet 1 of 3) 6-49 ... .
Page 16 11-25 ..11-5. HP 8560A RF Section Troubleshooting Block Diagram 12-2 12-l. Simplified Section Block Diagram ....
Page 17 Tables l-l. Service Kit Contents ......l-2. Static-Safe Accessories ......
Page 18 ..A-l. HP 8560A Spectrum Analyzer Documented Assemblies A-2. A4 and Al6 Assemblies Shipped with HP 8560As Serial Prefixed below 3207A A-3. Al5 RF Assemblies Shipped with HP 8560As Serial Prefixed below 3029A .
Page 19: General Information
General Information HP 8560A Spectrum Analyzer Service Manual This contains information required to adjust and service the HP 8560A Spectrum Analyzer to the assembly level. HP 856OA/61B/63A Spectrum Analyzer For component-level information, refer to the Component Level Information. Manual Organization...
Page 20: Manual Text Conventions
Text Serial N.umbers Covered by This Manual This service manual applies directly to HP 8560A spectrum analyzers with serial numbers prefixed 3207A and above. For HP 8560A spectrum analyzers with serial numbers prefixed below 3207A, order HP Part Number 08560-90038.
Page 21: Instrument Variations
Instrument Variations The following text lists the unique assemblies contained in the HP 8560A Options 001, 002, 003, and all combinations. HP 8560A Option 001 (Rear-Panel 2nd IF Output) Al5 RF Assembly unique part number added Rear-panel JlO added HP 8560A Option 002 (Tracking Generator)
Page 22 Rear-panel J 11 added Front-panel 53 deleted Front-panel J6 added HP 8560A Option 003 (Precision Frequency Reference) Al5 RF Assembly unique part number A21 OCXO added w 4 9 added added HP 8560A Option 013 (001 + 003)
Page 23 Front-panel J6 added A21 OCXO added w 4 9 added added Option 8560A 123 (001 + 002 + 003) Al5 RF Assembly unique part number added Rear-panel JlO added A10 Tracking Generator added Front dress-panel unique part number w 1 4...
Page 24: Hp 85629B Test And Adjustment Module
When attached to the spectrum analyzer’s rear panel, the HP 85629B Test and Adjustment Module (TAM) p rovides diagnostic functions for the HP 8560A. Because the TAM connects directly to the analyzer’s internal data and address bus, it controls the analyzer’s hardware directly.
Page 25: Electrostatic Discharge
Electrostatic Discharge Electrostatic discharge (ESD) can damage or destroy electronic components. Therefore, all work performed on assemblies consisting of electronic components should be done at a static-free workstation. Figure l-2 is an example of a static-safe work station using two kinds of ESD protection: w Conductive table mat and wrist-strap combination.
Page 26: Static-Safe Accessories
Static-Safe Accessories Table 1-2. Static-Safe Accessories HP Part Description Number Set includes: static control mat and 4.6 cm (15 ft) 1.2 m (2 ft 4 ft) 9300-0797 ground wire. (The wrist-strap and wrist-strap cord are not included. They must be ordered separately.) 9300-0980 Wrist-strap cord 1.5 m (5 ft)
Page 27 2. Install the front-panel cover on the instrument. 3. Wrap the instrument in antistatic plastic to reduce the possibility of damage caused by electrostatic discharge. 4. Use the original materials or a strong shipping container that is double-walled, corrugated cardboard carton with 159 kg (350 lb) bursting strength. The carton must be both large enough and strong enough to accommodate the analyzer and allows at least 3 to 4 inches on all sides of the analyzer for packing material.
Page 28: Hp 8560A Shipping Container And Cushioning Materials
S K 1 1 2 6 Item Description HP Part Number 9211-5636 Outer Carton 08590-80013 Pads (2) 08590-80014 Bottom Tray Figure 1-3. HP 8560A Shipping Container and Cushioning Materials l-1 0 General Information...
Page 29: 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-3. In any correspondence, be sure to include the pertinent information about model numbers, serial numbers, and assembly part numbers.
Page 30 Table 1-3. Hewlett-Packard Sales and Service Offices US FIELD OPERATIONS EUROPEAN OPERATIONS INTERCON OPERATIONS HEADQUARTERS HEADQUARTERS HEADQUARTERS Hewlett-Packard Company Hewlett-Packard S.A. Hewlett-Packard Company 19320 Pruneridge Avenue 150, Route du Nant-d’Avri1 3495 Deer Creek Rd. Cupertino, CA 95014, USA 1217 Meyrin 2/Geneva Palo Alto, California 94304-1316 (800) 752-0900 Switzerland...
Page 31: Recommended Test Equipment
Instrument Critical Specifications Recommended for Equipment Substitution Model Synthesized Frequency Range: 10 MHz to 7 GHz HP 8340A* PAT, Sweeper Frequency Accuracy (CW): 1 x 10eg/day (two required) Leveling Modes: Internal & External Modulation Modes: AM & Pulse Power Level Range: -80 to +16 dBm...
Page 32 Table 1-4. Recommended Test Equipment (continued) Instrument Critical Specifications Recommended for Equipment Substitution Model Measuring Compatible w/Power Sensors HP 8902A* PAT, Receiver dB Relative Mode Resolution: 0.01 dB Reference Accuracy: <&1.2% Power Sensor Frequency Range: 50 MHz to 6.9 GHz...
Page 33 Attenuation Accuracy: <f0.6 dB Option 010 Maximum SWR: 1.2 (dc to 6.5 GHz) Signature Multimeter Clock Frequency >lO MHz HP 5005A/B Reference Attenuator Supplied with HP 8484A HP 11708A Termination Frequency Range: dc to 22 GHz HP 909D P,M,V Impedance: 5OQ Maximum SWR: <1.22...
Page 34 (five required) Length: 2 122 cm (48 in.) HP 10833B Cable, HP-IB Required w/Performance Test Software (12 required) Required w/HP 85629B Test & Adjustment Module Length: 2 m (6.6 ft.) 8120-4921 Cable Frequency Range: 10 kHz to 6.9 GHz P,A,M,V (three required) Maximum SWR: <1.4 at 6.9 GHz...
Page 35: Adjustment Procedures
Introduction This chapter contains information on automated and manual adjustment procedures for the HP 8560A spectrum analyzer. Perform the automated procedures using the HP 85629B Tests and Adjustment Module (TAM). Never perform adjustments as routine maintenance. Adjustments should be performed after a repair or performance test failure.
Page 36: Safety Considerations
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.
Page 37: Adjustment Tools
For adjustments requiring nonmetallic tuning tool, use fiber tuning tool, HP part number 8170-0033. For adjustments to the IF Bandpass, use tuning tool, HP part number 8710-1010. Never try to force an adjustment control. This is especially critical when tuning variable capacitors or slug-tuned inductors.
Page 38: Display Adjustment
(or perform the Frequency Frequency Response Adjustment Distribution Amplifier Response performance test in the HP 8560A Installation and Verification Manual. The adjustment must be performed if the performance test fails.) Frequency Response Adjustment A8 Low Band Mixer (or perform the...
Page 39: Sampling Oscillator Adjustment
600 MHz Amplitude Adjustment Al5Al 2nd IF Amplifiel Second IF Gain Adjustment Al5A2 Sampler Sampling Oscillator Adjustment Display Adjustment Al7 CRT Driver 418Vl CRT Display Adjustment No related adjustment A19 HP-IB 10 MHz Reference Adjustment (OCXO) A21 OCXO Adjustment Procedures 2-5...
Page 40: Adjustable Components (1 Of 3)
Table 2-2. Adjustable Components (1 of 3) Reference Adjustment Adjustment Description Designator Name Number A2R206 DGTL X GAIN Adjusts the horizontal gain in the X line generator. A2R209 SWEEP OFFSET Adjusts the beginning of the trace to the leftmost vertical graticule line in fast-analog, zero-span mode. A2R215 DGTL Y GAIN Adjusts the vertical gain in the Y line generator.
Page 41: Adjustable Components (2 Of 3)
Table 2-2. Adjustable Components (2 of 3) Reference Adjustment Adjustmend Description Designatol Name Number A5T500 XTAL CTR 3 Adjusts center frequency of third stage of crystal bandwidth filter to 10.7 MHz. A5T502 XTAL CTR 4 Adjusts center frequency of fourth stage of crystal bandwidth filter to 10.7 MHz.
Page 42: Adjustable Components (3 Of 3)
Table 2-2. Adjustable Components (3 of 3) Reference Adjustment Adjustment Description Designator Name Number A15R561 C A L A M P T D Adjusts amplitude of the 300 MHz calibrator signal to -10.0 dBm. A15R926 E X T B I A S Z E R O Adjusts zero bias point of external mixer bias.
Page 43: Using The Tam
Using the TAM The HP 85629B TAM can be used to perform approximately half of the HP 8560A adjustment procedures. Table 2-4 lists the TAM adjustments and their corresponding manual adjustments. The TAM adjustments do not include procedures for choosing factory-selected components. If an adjustment cannot be made and a factory-selected component must be changed, refer to the corresponding manual adjustment.
Page 44: Tam Adjustments
(Option 003) 13. External Mixer Bias * External Mixer Bias Adjustment 14. External Mixer Amplitude * External Mixer Amplitude Adjustment * Adjustment excluded if the HP 8560A is an Option 002. Table 2-5. Required Test Equipment for TAM Adjustment Equipment Used...
Page 45 HP 10503A Test Cable BNC 7. Sampling Oscillator Manual Probe Cable Frequency Counter (3 to 6.8 GHz) HP 5342A, HP 5343A 8 . Y T O HP 8902A, HP 436A, 9. LO Distribution Amplifier Power Meter HP 438A HP 8485A Power Sensor (3 to 6.8 GHz, 10 to 20 dBm)
Page 46: High-Voltage Power Supply Adjustment
1. High-Voltage Power Supply Adjustment Assembly Adjusted A6 Power Supply Related Performance Test There is no related performance test for this adjustment. Description 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 47 Digital Multimeter ........
Page 48: Display Adjustment
Equipment HP 355D 10 dB VHF Step Attenuator ........
Page 49 2. Display Adjustment Procedure 1. Set the analyzer’s @ switch off. Remove the analyzer’s cover and fold out the A2 Controller and A3 Interface assemblies as illustrated in Figure 2-2. Connect the CAL OUTPUT to the INPUT. Adjustment locations are shown on the CRT neck for Al7 adjustments and in Figure 2-4 for the A2 adjustments.
Page 50 2. Display Adjustment 14. Adjust the rear-panel Y POSN and A17R75 Y GAIN until the softkey labels align with their appropriate softkeys. 15. Press [m). If necessary, readjust STOP BLANK and START BLANK for the best-looking intersection of the graticule lines. This will be most noticeable along the center vertical and horizontal graticule lines.
Page 51: Crt Adjust Pattern
, as indicated by the TEK JlG-TV Photometer/Radiometer. 17. Press (CAL), MORE 1 of 2, and CRT ADJ PATTERN. Locate the dot just below the HP logo. Adjust A17R93 ASTIG for the smallest round dot possible. D E F L E C T I O N A D J U S T M E N T S...
Page 52: A2 Display Adjustment Locations
2. Display Adjustment AZR215 A2R263 AZR262 A2R268 D G T L Y G A I N S T A R T B L A N K S T O P B L A N K V I D E O G A I N AZR206 D G T L Y G A I N S K 1 4...
Page 53 A2R271 SWEEP GAIN to midrange. Adjustment locations are shown in Figure 2-4 for these A2 adjustments. 23. Set the HP 355D Attenuator to provide 30 dB attenuation. 24. Press (-1 on the analyzer, and connect the equipment as shown in Figure 2-2. Set...
Page 54: If Bandpass Adjustment
Equipment HP 3456A Digital Voltmeter ..........
Page 55 Reconnect the power cord and set the (LINE) switch on. Allow the analyzer to warm up for at least 30 minutes. 2. Connect the negative DVM lead to pin 6 of A5J6. See Figure 2-5. Set the HP 3456A controls as follows: FUNCTION .
Page 56: Factory-Selected Lc Filter Capacitors
* Indicates a condition that should not exist; suspect broken hardware. XTAL Bandpass Adjustments 13. On the HP 856OA, press @ii) 1 m and ICAL). 14. Move the positive DVM test lead to A5TP7. ADJ CURR IF STATE. Wait for the IF ADJUST STATUS...
Page 57: Factory-Selected Xtal Filter Capacitors
Caution Set the HP 8560A luNE) switch off before removing or replacing any shield. 18. Move the positive DVM test lead to A5TP8. 19. Adjust A5T202 XTAL CTR 2 using the procedure in steps 15 through 17.
Page 58: Capacitor Part Numbers
3. IF Bandpass Adjustment Table 2-10. Capacitor Part Numbers Capacitor Value (pF) HP Part Number 0160-4793 0160-4792 0160-4791 0160-4790 0160-4789 0160-4788 0160-5699 0160-4787 0160-5903 0160-4786 2-24 Adjustment Procedures...
Page 59: If Amplitude Adjustments
.........
Page 60: If Amplitude Adjustment Locations
4. IF Amplitude Adjustments A 4 L O G A M P R 8 2 6 R 4 4 5 ( R E V I S I O N C O N N E C T O R ) R 5 4 4 ’...
Page 61 4. IF Amplitude Adjustments Procedure 1. Set the HP 8560A m switch to off. Remove the analyzer cover and place the analyzer in the service position as illustrated in Figure 2-6. See Figure 2-7 for adjustment location. 2. Disconnect W29, violet coax cable, from A5J3. Connect the test cable between A5J3 and the 50 R output of the HP 3335A.
Page 62 27. The MARKER amplitude should read -10 dBm +/-.13 dB. If the reading is outside of this range, repeat steps 4 through 21. 28. On the HP 8560A, reconnect W29 to A5J3. Press (PRESET) and set the controls as follows: C E N T E R F R E Q .
Page 63: Dc Log Amplifier Adjustments
.........
Page 64 1. Set the HP 8560A m switch to off. Remove the analyzer cover and place the analyzer in the service position as illustrated in Figure 2-6. See Figure 2-7 for adjustment location. 2. Connect the HP 3335 50 0 output to the HP 8560A 50 0 input. Set the HP 8560A (LINE) switch on.
Page 65 5. DC Log Amplifier Adjustments 7. Reduce the input power by 40 dB, to -58 dBm ( use an attenuator or a source with a good relative amplitude accuracy). 8. If the signal is lower on the screen than expected (delta marker reads a change of greater than 40 dB, such as -4ldB) then adjust A4R544 ( see Figure 2-7) for an even lower level LCAL), ADJ CURR IF STATE .
Page 66 1. Set the HP 8560A (LINE) switch to off. Remove the analyzer cover and place the analyzer in the service position as illustrated in Figure 2-6. See Figure 2-7 for adjustment location. 2. Connect the HP 3335 50 R output to the HP 8560A 50 R input. Set the HP 8560A (LINE) switch on.
Page 67: Sampling Oscillator Adjustment
.........
Page 68 6. Sampling Oscillator Adjustment Procedure 1. Set the HP 8560A m switch to off and disconnect the line power cord. Remove the analyzer cover and fold down the Al5 RF and Al4 Frequency Control assemblies. Prop up the Al4 Frequency Control assembly. Reconnect the line power cord and set the (LINE) switch on.
Page 69: Coarse-Tune Adjustment Setup
S K 1 8 Figure 2-9. Coarse-Tune Adjustment Setup 21. Set the HP 8560A m switch off and remove the top shield over the sampling oscillator. Connect the equipment as shown in Figure 2-9. 22. Remove any existing shorts from the exposed center-conductor of coaxial resonator 2200 to the ground plane.
Page 70: Sampling Adjustments
29. Remove the power supply leads and the active probe. 30. Set the HP 8560A (LINE) switch off and reinstall the top shield. Set the m switch on. 31. Repeat the procedure beginning at step 2 for the remaining center frequencies listed in Table 2-11.
Page 71: Yto Adjustment
Figure 2-10. YTO Adjustment Setup Equipment Microwave Frequency Counter ......HP 5343A Option 001 Adapters Type N (m) to BNC (f) .
Page 72 YTO Main Coil Adjustments Set the HP 8560A m switch off. Remove the analyzer cover and fold down the Al5 RF and Al4 Frequency Control assemblies. Disconnect the 50R termination from the 1ST LO OUTPUT. Connect the equipment as shown in Figure 2-10.
Page 73 YTO FM Coil Adjustments 13. On the HP 856OA, press (PRESET) and set the controls as follows: CENTER FREQ . . . :......... .300 MHz SPAN .
Page 74: First Lo Distribution Amplifier Adjustment
Type N (f) to APC (m) ......... . . 1250-1750 Procedure 1. Set the HP 8560A (LINE) switch off and disconnect the line cord. Remove the cover and fold down the Al5 RF and Al4 Frequency Control assemblies. Reconnect the line cord.
Page 75 6. Adjust A14R628 GATE BIAS for a DVM reading within 5% of the GATE BIAS voltage printed on the A7 LO Distribution Amplifier label. 7. Zero and calibrate the HP 8902A/HP 8485A in LOG mode (power levels read in dBm). Enter the power sensor 1 GHz Cal Factor into the HP 8902A.
Page 76: Tracking Generator Power Level Adjustments
Type N, 62 cm (24 in.) ........
Page 77: Tracking Generator Power Level Adjustments Setup And Adjustment
HP 8560A. 3. Press (PRESET) on the HP 8560A and set the controls as follows: CENTER FREQ ..........300 MHz SPAN .
Page 78 9. Tracking Generator Power Level Adjustments 10. Set the TRK GEN RF POWER to dBm. Note the power displayed on the measuring receiver. Power at -10 dBm Setting 11. Proceed with steps 12 through 14 only if the power level noted in the previous step was outside the range of -10 dBm +/-.23 dB.
Page 79: 10. Frequency Response Adjustment
10. Frequency Response Adjustment 10. Frequency Response Adjustment Assembly Adjusted Al5 RF Assembly Related Performance Tests Displayed Average Noise Level Frequency Response Description A signal of the same known amplitude is applied to the spectrum analyzer at several different frequencies. At each frequency, the DAC controlling the flatness compensation amplifiers is adjusted to place the peak of the displayed signal at the same place on the screen.
Page 80 HP 8560A display. Adjust the HP 8340A/B POWER LEVEL for a -10 dBm reading on the HP 8902A. 9. On the HP 8560A, adjust the RF Gain DAC value using the front-panel knob or keypad until the marker reads -10 dBm +/-.10 dB.
Page 81: 10. Frequency Response Adjustment
10. Frequency Response Adjustment 13. Place the WR PROT/WR ENA jumper on the A2 Controller assembly in the WR PROT position. Adjustment Procedures 2-47...
Page 82: 11. Calibrator Amplitude Adjustment
Measuring Receiver ........
Page 83 11. Calibrator Amplitude Adjustment 3. Connect the HP 8482A through an adapter directly to the HP 8560A CAL OUTPUT connector. 4. Adjust A15R561 CAL AMPTD for a -10.00 dBm reading on the HP 8902A display. Adjustment Procedures 2-49...
Page 84: Mhz Frequency Reference Adjustment Setup
.........
Page 85 30 minutes for the TCXO to warm up. 4. Remove dust cap from A15U302, TCXO. The dust cap is toward the rear of the HP 8560A. 5. Adjust 10 MHz ADJ on A15U302 for a frequency counter reading of 300.000000 MHz f30 Hz.
Page 86: 13. Demodulator Adjustment
AM/FM Signal Generator ......... HP 8640B .
Page 87 .........
Page 88 A4C707 FM DEMOD for the loudest audio tone from the internal speaker. This adjustment method may give broader and less accurate results than when using the oscilloscope to peak the response. 11. Set the.HP 8560A LuNE) switch to off. Disconnect the probe from A4R718. 2-54 Adjustment Procedures...
Page 89: 14. External Mixer Bias Adjustment
BNC,122 cm(48in) ........
Page 90 14. External Mixer Bias Adjustment [m) EXTERNAL MIXER BIAS, On the HP 8560A press then BIAS OFF. 4. Adjust A15R926 EXT BIAS ZERO for a DVM reading of 0.000 Vdc 512.5 mV. 2-56 Adjustment Procedures...
Page 91: 15. External Mixer Amplitude Adjustment
IF INPUT. The flatness compensation amplifiers are then adjusted (via DACs) to place the displayed signal at the reference level. Only the determination of the Flatness Compensation Amplifier slope is performed if the HP 8560A has Option 002. BNC CABLE...
Page 92 EXTERNAL MIXER AMPTD CORRECT , then CNV LOSS VS FREQ . 5. On the HP 8560A, press LCAL), MORE 1 OF 2, SERVICE CAL DATA, 3RD IF AMP, and CAL 3RD AMP GAIN. Wait until the message ADJUSTMENT-DONE appears in the active function block.
Page 94: 16. Second If Gain Adjustment
No test equipment or test setup is required for this adjustment procedure. Procedure 1. Set the HP 8560A m switch off, disconnect the power cord, and remove the analyzer cover. Fold down the Al5 RF and Al4 Frequency Control assemblies. Prop up the Al4 Frequency Control assembly.
Page 95 16. Second IF Gain Adjustment A15Al B E N E A T H I E L D SK118 Figure 2-19. Location of AlSAl Adjustment Procedures 2-61...
Page 96: A15U802 Values
16. Second IF Gain Adjustment Table 2-13. A15U802 Values Second IF Amplifier U802 Value Second IFA Pad Gain Range (dB) Part Number (dB) 13.1 to 14.2 0955-0308 0955-0309 14.3 to 15.2 15.3 to 16.2 0955-0310 16.3 to 17.2 0955-0311 17.3 to 18.2 0955-0312 18.3 to 19.2 0955-0313...
Page 97: 17. Signal Id Oscillator Adjustment
Microwave Frequency Counter ........
Page 98 BNC, 122 cm (48 in) (2 required) ........
Page 99 Fs dB HIGH. F3 dB HIGH = 10. Observe the HP 8566A/B display as you adjust A15C629 SIG ID for the lowest obtainable frequency with less than 3 dB decrease in amplitude from maximum. Record the frequency counter reading as Fs dB LOW.
Page 100: 18. 600 Mhz Amplitude Adjustment
Spectrum Analyzer ........
Page 101 ATTEN ............OdB 5. While observing the HP 8566 display, adjust A15R726 600 MHz AMPLITUDE to minimize the noise floor.
Page 102: Mhz Reference Adjustment (Option 003)
Frequency Counter ..........HP 5334A/B Frequency Standard ....... . . HP 5061B Cesium Beam...
Page 103: Mhz Reference Adjustment (Option 003)/Setup And Adjustment Location
19. 10 MHz Reference Adjustment (Option 003) SPECTRUM ANALYZER FREQUENCY STANDARD /’ E L E C T R O N I C OOOb 10 MHz OUTPUT BNC CABLE BNC CABLE B O T T O M - S I D E V I E W O F M A I N D E C K FREO SK120...
Page 104 INPUT A signal and 10.0 MHz with a displayed resolution of 0.010 Hz (10 mHz). Locate the FREQ ADJ control on the HP 8560A. This control is accessible through the center deck of the spectrum analyzer. See Figure 2-22.
Page 105: Tracking Oscillator Adjustment (Option 002)
..........5061-5458 ....... HP 10503A BNC, 122 cm (48 in.) (3 required)
Page 106: Tracking Oscillator Adjustment Setup
3. Set the HP 8560A LINE switch on. Press (mCTRL), TRACKING GENRATOR , SRC PWR ON, (AUX-), REAR PANEL, and 10 MHz EXT . Allow the HP 8560A to warmup for at least five minutes. Set the controls as follows: C E N T E R F R E Q .
Page 107: Tracking Oscillator Range Centering
Repeat steps 7 through 14 at least once more until no further adjustment of AlOC3 TRK OSC CTR is necessary. Set the HP 8560A LINE switch off. Replace the dust cap screw on AlO. Disconnect all cables from AlO. 17. Reinstall A10 in the HP 8560A.
Page 108: Assembly Replacement
Assembly Replacement This chapter describes the removal and replacement of all major assemblies. The following replacement procedures are provided: Page Access to InternalAssemblies............3- Cable Color Code..............3- 2 Procedure 1. Analyzer Cover............3- 3 Procedure 2. Al Front Frame/Al8 CRT ..........3-4 Procedure 3.
Page 109: Access To Internal Assemblies
Access to Internal Assemblies Servicing the HP 8560A requires the removal of the spectrum analyzer’s cover assembly and the folding down of six board assemblies. Four of these assemblies lay flat along the top of the analyzer and two lay flat along the bottom of the analyzer. All six assemblies are attached to the analyzer’s right side frame using hinges and fold out of the analyzer allowing access to all...
Page 110: Procedure 1. Analyzer Cover
Procedure 1. Analyzer Cover Procedure 1. Analyzer Cover Removal/Replacement 1. Disconnect the line-power cord, and place the analyzer on its front panel. 2. Loosen (but do not remove) the four rear-bumper screws, using a 4 mm hex wrench. Pull the cover assembly off towards the rear of the instrument. Caution When replacing the analyzer’s cover, use caution to avoid damaging any cables.
Page 111 A6AlW3 post-accelerator cable. Make sure that the analyzer’s 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 112: Procedure 2. Al Front Frame/Al8 Crt
Procedure 2. Al Front Frame/Al8 CRT Warning The voltage potential at A6AlW3 is +9 kV. Failure to discharge A6AlW3 severe electrical shock correctly may result in to personnel and damage to the instrument. A6AlW3 HIGH-VOLTAGE PROBE ’ \ G R O M M E T A6A-1 W3 SK123 Figure 3-2.
Page 113 Procedure 2. Al Front Frame/Al8 CRT ,W42 ( S T R D ) 4 P L A C E S w 4 7 ( O P T 0 0 2 ) 5J15 ( O P T 0 0 2 ) Figure 3-3.
Page 114 Procedure 2. Al Front Frame/Al8 CRT 22. Use a 9/16-inch nut driver to remove the dress nut holding the front-panel CAL OUTPUT connector to the front panel. If necessary, drill out the nut driver to fit over the BNC connectors and cover the tip with heatshrink tubing or tape to avoid scratching the enameled front panel.
Page 115 Note 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 analyzer.
Page 116 Procedure 2. Al Front Frame/Al8 CRT AIAIWI SK127 Figure 3-6. 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 analyzer. 8.
Page 117 Procedure 2. Al Front Frame/Al8 CRT 15. Connect W36, coax 86, to the front-panel IF INPUT connector. 16. Use a 5/16-inch wrench to connect W41 from the A9 Input Attenuator to the front-panel INPUT 5OQ connector. Make sure that W40, W36, and AlWl are routed between W41 and the attenuator bracket.
Page 118: Procedure 3. Alal Keyboard/Front Panel Keys
Procedure 3. AlAl Keyboard/Front Panel Keys Procedure 3. AlAl Keyboard/Front Panel Keys Removal 1. Remove the front frame from the analyzer as described in Procedure 2, “Al Front Frame/A18 CRT.” 2. Place the front frame face-down on the bench and remove the front-frame center support. 3.
Page 119: Procedure 4. Ala Rpg
Procedure 4. AlA RPG Removal 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 120 Procedure 5. A2, A3, A4, and AS Assemblies Procedure 5. A2, A3, A4, and A5 Assemblies Removal 1. Remove the analyzer’s cover. 2. Place the analyzer on its right side frame. 3. Remove the eight screws holding the A2, A3, A4, and A5 assemblies to the top of the analyzer.
Page 121: Procedure 5. A2, A3, A4, And A5 Assemblies
Procedure 5. A2, A3, A4, and A5 Assemblies SK129 Figure 3-7. A2, A3, A4, and A5 Assembly Removal Replacement 1. Place the analyzer top-side-up on the work bench. 2. Attach the assembly being installed to the two chassis hinges with two panhead screws. 3.
Page 122: Assembly Cables (1 Of 2)
Procedure 5. A2, A3, A4, and A5 Assemblies B L U E W 2 4 G R E E N w 5 4 R E D C O M P O N E N T S I D E W H I T E B L U E C O M P O N E N T B L A C K...
Page 123: Assembly Cables (2 Of 2)
Procedure 5. A2, A3, A4, and A5 Assemblies W 5 2 WH I TE V I O L E T W 2 7 SK131 O R A N G E Figure 3-8. Assembly Cables (2 of 2) 3-18 Assembly Replacement...
Page 124: Coaxial Cable Clip
A6 power supply top shield. 9. Fold the A2 and A3 assemblies together as a unit into the 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 125: Hp-Ib And Alal Wl Cable Placement
Procedure 5. A2, A3, A4, and A5 Assemblies AlAlWl A 3 J602 A19Wl SK133 Figure 3-10. HP-IB and AlAl Wl Cable Placement 3-18 Assembly Replacement...
Page 126: Procedure 6. A6 Power Supply Assembly
A6AlW3 post-accelerator cable. Make sure that the analyzer’s 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 127: A6 Power Supply Connections
Procedure 6. A6 Power Supply Assembly 16. Use a screwdriver to remove three standoffs from the A6 Power Supply assembly. 17. Remove the A6 Power Supply assembly by lifting from the regulator heatsink toward front of analyzer. Replacement 1. Attach the A6 Power Supply assembly to the analyzer’s chassis using the three standoff screws.
Page 128: Power Supply Cover
Procedure 6. A6 Power Supply Assembly 7. Fold the A2, A3, A4, and A5 assemblies into the analyzer as described in Procedure 5, “A2, A3, A4, and A5 Assemblies Replacement,” steps 6 through 12. SK135 Figure 3-12. Power Supply Cover Assembly Replacement 3-21...
Page 129: Procedure 7. A6Al High Voltage Assembly
A6AlW3 post-accelerator cable. Make sure that the analyzer’s 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 130: Al7 Crt Driver Mounting Screws
Procedure 7. A6Al High Voltage Assembly 16. Disconnect ribbon cable A6AlWl from A6J5. See Figure 3-11. 17. Remove the two screws (1) securing two board-mounting posts to the left side frame and remove the posts. See Figure 3-13. 18. Remove the two left side-frame screws (2) securing the Al7 assembly. 19.
Page 131 Procedure 7. A6Al High Voltage Assembly 10. Fold the A2, A3, A4, and A5 assemblies into the analyzer and secure the analyzer cover assembly as described in Procedure 5, “A2, A3, A4, and A5 Assemblies.” 3-24 Assembly Replacement...
Page 132: Procedure 8. A7 Through Al3 Assemblies
Procedure 8. A7 through Al3 Assemblies Procedure 8. A7 through Al3 Assemblies A separate replacement procedure is supplied for each assembly listed below. Before beginning a procedure, do the following: w Fold out the Al4 and Al5 assemblies as described in Procedure 9, “Al4 and Al5 Assemblies.”...
Page 133: Assembly Locations
Procedure 8. A7 through Al3 Assemblies w 4 4 w 3 9 W 3 8 w 4 2 T A N D A R D F L 1 W 5 6 w 4 5 w 4 7 - w 3 4 (OPTION 0 0 2 ) F L 2...
Page 134: Rf Section Bias Connections
Procedure 8. A7 through Al3 Assemblies G A T E B I A G N D W H I T E / V I O L E T ( 9 7 ) B L A C K SJ17 Figure 3-15. RF Section Bias Connections Assembly Replacement 3-27...
Page 135: A7 1St Lo Distribution Amplifier
A7 1st LO Distribution Amplifier Removal 1. Remove the two screws securing the assembly to the analyzer’s center deck. 2. Use a 5/16-inch wrench to disconnect W38 and W39 at A7Jl and J2. 3. Disconnect W42 (W43 on Option 002) at the front-panel 1ST LO OUTPUT connector. Loosen W42 (W43 on Option 002) at A7J3.
Page 136: A8 Low Band Mixer
A8 Low Band Mixer A8 Low Band Mixer Removal 1. Disconnect W34 at A15A2J1, and place the analyzer upside-down on the work bench with Al4 and Al5 folded out to the left. 2. Remove W45 from FL1 and A8Jl 3. Use a 5/16-inch wrench to loosen the semirigid coax cable connections at A8J2 and A8J3. 4.
Page 137: A9 Input Attenuator
A9 Input Attenuator Removal 1. Disconnect W34 at A15A2J1, and place the analyzer upside-down on the work bench. 2. Remove W41 and disconnect W44 from the attenuator. 3. Remove screw (1) securing the attenuator to the front-frame center support. See Figure 3- 15.
Page 138: A10 Tracking Generator (Option 002)
A10 Tracking Generator (Option 002) A10 Tracking Generator (Option 002) Removal 1. Use a 5/16 inch wrench to remove the Tracking Generator’s RF OUT, LO OUT, and LO IN semi-rigid cables. 2. Disconnect W14 and W16 from the Tracking Generator. 3.
Page 139: Allyto
All YTO Removal 1. If the analyzer is an Option 002, remove the Tracking Generator before proceeding. 2. Place the analyzer top-side-down on the work bench. 3. Use a 5/16 inch wrench to remove W56/FL2/W57 (as a unit). 4. Disconnect W38 at the All Assembly. 5.
Page 140: Al3 Second Converter
Al3 Second Converter Al3 Second Converter Caution Turn off the analyzer’s power when replacing the Al3 Second Converter Assembly. Failure to turn off the power may result in damage to the assembly. Removal 1. Disconnect W34 at A15A2Jl and place the analyzer upside-down on the work bench. 2.
Page 141: Procedure 9. Al4 And Al5 Assemblies
Procedure 9. Al4 and Al5 Assemblies R e m o v a l 1. Remove the analyzer’s cover as described in Procedure 1, “Analyzer Cover.” 2. Place the analyzer on its right side frame. 3. Remove the eight screws and washers holding the Al4 and Al5 assemblies to the bottom of the analyzer.
Page 142 Procedure 9. Al4 and Al5 Assemblies Caution DO NOT fold the board assemblies out of the 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 143: Al4 And Al5 Assembly Cables
Procedure 9. Al4 and A15 Assemblies AIAI W 3 2 w 3 7 WI 1 (OPTION 0 0 2 ) Y \ \ W I 9 (OPTION 0 0 1 ) w 4 9 (OPTION 0 0 3 ) w 3 5 (OPTION 0 0 3 ) W 3 6 (DELETED...
Page 144: Procedure 10. Al7 Crt Driver
Procedure 10. Al7 CRT Driver Procedure 10. Al7 CRT Driver Removal 1. Remove the analyzer’s cover assembly and fold out the A2, A3, A4, and A5 assemblies as described in Procedure 5, “A2, A3, A4, and A5 Assemblies Removal,” steps 3 through 6. 2.
Page 145: Procedure 11. Bl Fan
Procedure 11. Bl Fan Removal/Replacement Warning 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 146: Procedure 12. Btl Battery
Procedure 12. BTl Battery Procedure 12. BTl Battery Warning Battery BTl contains lithium polycarbon monofluoride. Do not incinerate or puncture this battery. Dispose of discharged battery in a safe manner. Caution To avoid loss of the calibration constants stored on the A2 Controller assembly, connect the analyzer to the main power source and turn on before removing the battery.
Page 147: Procedure 13. Rear Frame/Rear Dress Panel
A6AlW3 post-accelerator cable. Make sure that the analyzer’s 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 148: Main Deck Screws
Use a 5/16-inch wrench to disconnect Jll from the rear panel. 19. Disconnect the two cable ties holding ribbon cable W7 to the A19 HP-IB assembly. 20. Remove four screws (1) securing the rear frame to the main deck. See Figure 3-22.
Page 149 Replace the battery. 11. Secure the battery assembly to the rear frame, using two flathead screws. 12. Reconnect the two cable ties on the A19 HP-IB assembly to hold ribbon cable W7 to the A19 assembly. 13. Connect the fan and line-power cables to A6J3 and A6JlOl on the A6 Power Supply.
Page 151: Procedure 14. W3 Line Switch Cable
A6AlW3 post-accelerator cable. Make sure that the analyzer’s 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 152: W3 Dress And Connection To A6 Power Supply
20. Remove AlWl and AlWlDSl from the line-switch assembly. Let each hang freely. Note If contact removal tool, HP part number 8710-1791, is available, complete assembly removal by performing “Removal” steps 21 and 22. If not, skip to “Removal” step 23.
Page 153: Line Switch Mounting Screw And Cable Dress
Procedure 14. W3 Line Switch Cable 21. From the top side of the analyzer, use contact removal tool, HP part number 8710-1791, to remove the four wires from the W3 connector. See Figure 3-26. With wire cutters, clip the tie wrap holding the cable to the contact housing.
Page 154: W3 Cable Connector
Procedure 14. W3 Line Switch Cable C O N N E C T O R \ L 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 )
Page 155 Procedure 14. W3 Line Switch Cable Replacement (Using Contact Removal Tool, HP part number 8710-1791) 1. Ensure that the action of the switch is working properly. With a pair of wire cutters, clip the tie wrap holding the cable to the contact housing of the replacement W3 assembly.
Page 156: Side Frame Mounting Screws
Procedure 14. W3 Line Switch Cable 6. Attach the line-switch assembly into the front frame using the captive panhead screw. Be sure to connect the line-switch grounding lug with the screw. SK152 Figure 3-27. Side Frame Mounting Screws 7. On the top side of the analyzer, redress W3. 8.
Page 157: Procedure 15. Eerom (A2U501)
The EEROM is replaced with the power on. Use a nonmetallic tool to remove the defective EEROM and install the new EEROM. Turn the HP 8560A (LINE) switch off. Remove the analyzer’s cover assembly and fold out the A2, A3, A4, and A5 assemblies as described in Procedure 5, "A2,...
Page 158: A21 Ocxo Mounting Screws
Procedure 16. A21 OCXO (Option 003) Procedure 16. A21 OCXO (Option 003) Removal 1. Remove the rear-frame assembly as described in Procedure 13, “Rear Frame/Rear Dress Panel Removal,” steps 1 through 22. 2. Place the analyzer on its right-side frame. 3.
Page 159: Replaceable Parts
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.) No invoices.
Page 160: Direct Phone-Order System
4. The description of the part. 5. A five-digit code indicating a typical manufacturer of the part. 6. The manufacturer part number. Firmware-Dependent Part Numbers Refer to Firmware Note: HP 856X Series, HP 85620A, and HP 85629B. 4-2 Replaceable Parts...
Page 161: Reference Designations, Abbreviations And Multipliers (1 Of 4)
Table 4-2. Reference Designations, Abbreviations and Multipliers (1 of 4) 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...
Page 162: Reference Designations, Abbreviations, And Multipliers (2 Of 4)
Table 4-2. 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 163: Reference Designations, Abbreviations, And Multipliers (3 Of 4)
Table 4-2. Reference Designations, Abbreviations, and Multipliers (3 of 4) ABBREVIATIONS PLSTC Plastic Subminiature, Panel A Type (Threadec Nano, None P N P Positive Negative Connector) N-CHAN N-Channel Positive (Transistor Subminiature, Nanohenry POLYC Polycarbonate B Type (Slip-on Nanometer, POLYE Polyester Connector) Nonmetallic P O T...
Page 164: Reference Designations, Abbreviations, And Multipliers (4 Of 4)
Table 4-2. Reference Designations, Abbreviations, and Multipliers (4 of 4) ABBREVIATIONS Variable VDC Volts-Direct Current Microcandela Y I G Yttrium-lron- Microfarad Garnet Microhenry Microliter, Underwriters’ Watt, Wattage, Laboratories, Inc. White, Wide, Width UNHDND Unhardened W/SW With Switch ZNR Zener Wire Wound Variable, Violet, Volt, Voltage By (Used with...
Page 165: Manufacturers Code List (1 Of 3)
Table 4-3. Manufacturers Code List (1 of 3) Mfr. Manufacturer Name Address Code CO633 RIFA AB STOCKHOLM Cl433 AB ELEKTRONICK GMBH SALZBURG D8350 GROSS A STUTTGART D8351 MARQUARDT GMBH RIETHEIM D8439 ROEDERSTEIN/RESISTA GMBH LANDSHUT K7253 STC/STANTEL DEVON K8479 HOLSWORTHY ELECTRONICS LTD H O L S W O R T H Y E G SO545 NEC ELECTRONICS INC MTN VIEW...
Page 166 MA US 25403 NV PHILIPS ELCOMA EINDHOVEN 27014 NATIONAL SEMICONDUCTOR CORP SANTA CLARA CA US 28480 HP DIV 01 SAN JOSE COMPONENTS SAN JOSE 29005 STORM PRODUCTS CO LOS ANGELES 30043 SOLID STATE DEVICES INC LA MIRADA jL585 RCA CORP...
Page 167 Table 4-3. Manufacturers Code List (3 of 3) Mfr. Manufacturer Name Address Code AMETEK INC PAOLI 6E259 PA US ALLEN MFG CO HARTFORD 70276 GENERAL INSTRUMENT CORP CLIFTON 71744 DOW CORNING CORP MIDLAND 71984 CONTINENTAL SCREW CO DIV OF AMCA BEDFORD 72228 BECKMAN INDUSTRIAL CORP...
Page 168 Table 4-4. Replaceable Parts Reference HP Part <: Description Mfi Part Designation Number I: - Code Number ACCESSORIES SUPPLIED 1810-0118 TERMINATION-COAXIAL SMA; 0.5W; 500 16179 2003-6113-O2 1250-0780 ADAPTER-COAX F-BNC M-N 24931 29JP104-2 HP 10502P 50R COAX CABLE WITH BNC MALE...
Page 169 Table 4-4. Replaceable Parts (continued) Reference HP Part Description Part Designation Number Code Number 0515-0889 SCREW-MACH M3.5 x 0.6 GMM-LG 28480 0515-0889 0515-1241 SCREW-MACH M5 x 0.8 12MM-LG PAN-HD 28480 0515-1241 0515-1331 SCREW-METRIC SPECIALTY M4 x 0.7 THD; 7MM 28480 0515-1331 5061-9501 FRONT HANDLE ASS’Y...
Page 170 Table 4-4. Replaceable Parts (continued) Reference HP Part Description MG Part Designation N u m b e r D Code Number AlAl See Tbl A-l 1 BD AY-KEYBOARD 28480 See Tbl A-l 0960-0745 RPG ASSEMBLY (Includes Cable) 28480 0960-0745 See Tbl A-l...
Page 171 CABLE ASSEMBLY, TWO WIRE, TRACE ALIGN (P/O A18MP1, A17J5 to A18Ll) 28480 see Tbl A-l See Tbl A-l HP-IB ASSEMBLY 5061-9031 SABLE ASSEMBLY, RIBBON, HP-IB 28480 iO61-9031 A19Wl IA2J5 to Rear Panel J2) 5062-7755 BATTERY ASSY (Includes W6, BTl) 28480 jO62-7755 28480 1813-0644 121 (Opt.
Page 172 Table 4-4. Replaceable Parts (continued) Reference HP Part Description Mfr Part Designation Number Code Number 5061-9036 5083-9036 FAN ASSEMBLY (Includes Wire) 28480 1420-0341 BATTERY 3.0 V 1.2 A-HR LITHIUM 08709 BR 213 A 55P POLYCARBON MONOFLORIDE; BUTTON TERMINATIONS 2110-0709 THIONYL FUSE 5A 250V NTD FE IEC...
Page 173 Table 4-4. Replaceable Parts (continued) Reference HP Part Description Mfi- Part Designation Number Code Number ASSEMBLY SHIELDS (continued: A4 Assembly 5021-991: AMP 1 (BOTTOM) 2848C 5021-991: 5021-991: AMP 1 (TOP) 5021-991: 2848C 5021-9914 AMP 2 (TOP) 2848C 5021-9911 5021-991: AMP 2 (BOTTOM)
Page 174 Table 4-4. Replaceable Parts (continued) Reference HP Part Description Part Designation Number Code Number CABLE ASSEMBLIES POWER CABLE, RIBBON 5061-9024 28480 5061-9024 CONTROL CABLE, RIBBON 5061-9025 28480 5061-9025 CABLE ASSEMBLY LINE SWITCH 5062-0’728 28480 5062-0728 CABLE ASSEMBLY, RIBBON, OPTION 5061-9033...
Page 175 Table 4-4. Replaceable Parts (continued) HP Part Reference Description Mfr Part Number Designation Code Number 08560-60001 CABLE ASSEMBLY, A10 ALC 2848( 08560-6000. (Opt. 002) EXT (Rear Panel Jll to AlO) 5062-0721 CABLE ASSEMBLY, COAX 97, LO SWEEP 28480 5062-0721 0.5 V/GHz (A14J7 to Rear Panel JS) iv19 (Opt.
Page 176 Table 4-4. Replaceable Parts (continued) Reference HP Part Description Part Designation Number Code Number w 3 5 5062-0710 CABLE ASSEMBLY, COAX 92, INT 2ND IF 28480 5062-0710 (A13J2 to A15J801) 5062-0725 CABLE ASSEMBLY, COAX 86, EXT 2ND IF 28480 5062-0725...
Page 177: Replaceable Parts
Table 4-4. Replaceable Parts (continued) Reference HP Part C QtY Description Part Designation Number Code Number w 5 1 5062-6478 CABLE ASSEMBLY, COAX 84, 10 MHz REF2 28480 5062-6478 (A15J304 to A4J7) 5062-6477 CABLE ASSEMBLY, COAX 9, 10.7 MHz CAL SIG...
Page 178 4-20 Replaceable Parts...
Page 179 B O T T O M V I E W Description kern Code SCREW-MACH M3 x 0.5 30MM-LG PAN-HD 28480 SCREW-MACH M3 x 0.5 GOMM-LG PAN-HD 28480 SCREW-MACH M3 x 0.5 lOOMM-LG PAN-HD 28480 28480 WASHER-FL MTLC NO. 4 .125-IN-ID SCREW-MACH M3 x 0.5 GMM-LG PAN-HD 28480 Figure 4-1.
Page 180 4-22 Replaceable Parts...
Page 181 Parts List, Cover Assembly (See Figure 4-2) Item HP Part Description Mfr Part Number Code Number 5041-8911 BAIL HANDLE 28480 5041-8911 TRIM CAP 5041-8912 28480 5041-8912 0515-1114 SCREW MACH M4 X 0.7 lOMM-LG PAN-HD 28480 0515-1114 SPRING-CPRSN ,845 IN-OD 1.25-lN-OA-LG...
Page 182 4-24 Replaceable Parts...
Page 183 Parts List, Main Chassis (See Figure 4-3) Description Part Item HP Part Code Number Number SCREW-MACH M3 X 0.5 8MM-LG PAN-HD SEM 0515-1079 0515-1079 28480 5180-9023 5180-9023 SMM 3.0 35 PCPDS 28480 SCREW-MACH M3 X 0.5 35MM-LG PAN-HD SEM 0515-1826...
Page 184 4-26 Replaceable Parts...
Page 185 Parts List, RF Section (See Figure 4-4) Item HP Part Description Mfr Part Number Code Number 0515-0886 SCREW-MACH M3 X 0.5 GMM-LG PAN-HD 2848C 0515-0886 0515-0886 SCREW-MACH M3 X 0.5 GMM-LG PAN-HD 2848C 0515-0886 0515-0886 SCREW-MACH M3 X 0.5 GMM-LG PAN-HD...
Page 186 4-28 Replaceable Parts...
Page 187 Parts List, Front Frame (See Figure 4-5) [ten HP Part Description Part Number Code Number 0515-1622 SCREW-SKT-HD-CAP M4 X 0.7 8MM-LG 2848C 0515-1622 5041-8906 CRT BEZEL 2848C 5041-8906 1000-0897 RF1 CRT FACEPLATE 2848C 1000-0897 0370-3069 KNOB BASE l-1/8 JGK .252-IN-IO...
Page 188 4-30 Replaceable Parts...
Page 189 Parts List, Rear Frame (See Figure 4-6) Iten HP Part Description Mfr Part Number Code Number 0515-0890 28480 0515-0890 SCREWMACH M3 X 0.5 GMM-LG SODEG-FLH-HD 5062-7755 28480 5062-7755 BATTERY HOLDER (INCLUDES WIRES) 0515-1669 0515-1669 28480 SCREW-MACH M4 X 0.7 40MM-LG PAN-HD...
Page 190 4-32 Replaceable Parts...
Page 196: Major Assembly And Cable Locations
Major Assembly and Cable Locations Introduction This chapter identifies the module’s assemblies and cables and contains the following figures: Page Figure 5-l. Hinged Assemblies ......... . . Figure 5-2.
Page 197 A19Wl HP-IB Cable ........
Page 198 Cables .............Figure W34 First LO Samp.
Page 199: Hinged Assemblies
nnnu noon 0000 0000 noon n o o n A l 5 S K 1 5 5 Figure 5-l. Hinged Assemblies W 2 4 AIAIWI W 2 5 W 2 3 A3Wl C O M P O N E N T A19Wl *w53 S K 1 5 6...
Page 200: Top View (A2 And A3 Unfolded)
w 5 4 w 5 5 S K 1 5 7 W 2 7 Figure 5-3. Top View (A2 and A3 Unfolded) Major Assembly and Cable Locations 5-5...
Page 201: Top View (A2, A3, A4, And A5 Unfolded)
W 2 7 W 5 2 A19Wl AlAlWl A 1 9 A6Al A 2 1 A l 6 A l 7 w 5 5 A 1 8 ( O P T I O N 0 0 3 ) S K 1 5 8 Figure 5-4.
Page 202: Bottom View (Al5 Unfolded)
W I 9 ( O P T I O N 0 0 1 ) w 4 9 ( O P T I O N 0 0 3 ) (OPTION 0 0 3 ) W 3 6 (DELETED O P T I O N 0 0 2 ) W 2 9 w 3 4 W22 \...
Page 203: Bottom View (Al5 And Al4 Unfolded)
AIAI W 3 2 ‘WI4 WI 1 ( ‘ O P T 10~ 002) Figure 5-6. Bottom View (Al5 and Al4 Unfolded) 5-8 Major Assembly and Cable Locations...
Page 204: Front End
w 4 4 w 3 9 W 4 2 (STANDARD) F L 1 W 5 6 w 4 5 w 4 7 - w 3 4 O P T I O N 0 0 2 ) F L 2 w 3 3 W 4 6 O P T I O N...
Page 205: Rear View
BTl/A20 Figure 5-8. Rear View 5-10 Major Assembly and Cable Locations...
Page 206: General Troubleshooting
General Troubleshooting Introduction This chapter provides information needed to troubleshoot the instrument to one of the six major functional sections. Chapters 7 through 12 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 207: Assembly Test Points
The test jack is a collection of test points located on a 16-pin jack. There are over 26 test jacks used throughout the analyzer. The HP 85629B Test and Adjustment Module uses the analyzer’s test jacks during diagnostic and adjustment procedures. The pins on the test jack may be manually probed, provided caution is used to prevent accidental shorting between adjacent pins.
Page 208 T E S T P O I N T S O N B L O C K D I A G R A M T E S T J A C K P I N N A M E @AMPLIFIER T E S T J A C K T P 2 J4-MS8 /---...
Page 209: Ribbon Cable Connections (1 Of 2)
P O W E R F O R C O N T R O L L E R A N D I N T E R F A C E ‘.42 O N L Y D G N D D G N D D G N D D G N D 0 1 5...
Page 210 R E A R P A N E L J 3 A2J6 OAl5 . L O P T IDENT OAl4 0 1 1 8 . O A 1 3 O D 6 O D 5 D GND i . 8 7 . O D 4 D G N D D GND A2J2...
Page 211: Wr Prot/Wr Ena Softkey Menus
WR PROT/WR ENA Softkey Menus The jumper on jack A2J12 is shipped from the factory in the WR PROT (write protect) position (jumper on pins 2 and 3). W hen the jumper is set to the WR ENA (write enable) position (jumper on pins 1 and 2), an alternate softkey menu is displayed under (CAL).
Page 212: Wr Ena Softkey Menu
P A T T E R N I F A D J F R E Q O N O F F D I A G N O S E A D J C U R R I F S T A T E F U L L I F A D J R E F L V L...
Page 213: Troubleshooting To A Functional Section
Troubleshooting to a Functional Section 1. Refer to Table 6-l for the location of troubleshooting information. 2. If the HP 85629B Test and Adjustment Module (TAM) is available, refer to “Using the TAM” 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 214: Alal Keyboard
Al5 RF Assembly Chapter 10. Synthesizer Section Chapter 11. RF Section Chapter 12. Display/Power Supply Section Al7 CRT Driver A18 CRT Chapter 12. Display/Power Supply Section A19 HP-IB Chapter 9. Controller Section FL1,2 Chapter 11. RF Section General Troubleshooting 6-9...
Page 215: Using The Tam
(found in all menus) for useful information. Pressing (MODULE) will return you to the TAM’s main menu. The TAM acts as the active controller on the HP-IB bus. No other active controller should be connected to the bus. Diagnostic Functions The TAM provides the four diagnostic functions listed below.
Page 216: Tam Requirements
The HP 85629B Test and Adjustment Modules with firmware revision A Note or B will not properly execute Automatic Fault Isolation on the HP 8560A Spectrum Analyzer. HP 8560A Spectrum Analyzers with serial prefix 3207A and above have the Note TAM firmware residing in the spectrum analyzer.
Page 217: Inconsistent Results
TAM is malfunctioning and should be serviced. Blank Display It is possible to use the TAM’s Manual Probe Troubleshooting without a display if an HP-IB printer is available. Refer to Chapter 12 for more information. Automatic Fault Isolation Automatic Fault Isolation (AFI) is designed to isolate most faults to one or two assemblies.
Page 218: If/Log Check
(with measured and expected voltages/currents) is displayed with a list of additional areas to check. 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 General Troubleshooting 6-13...
Page 219: Cal Osc. Troubleshooting Mode
printer is connected, press Print Page to provide a hard copy of the currently displayed screen (the softkey labels will not be printed). Each test connector has fifteen pins (one pin is missing to act as a key). The pins contain eight measured signal lines (measured signal lines denoted as MS1 through MSS), one input signal line (OSl), one ground, and five pins encoding a five-bit connector address.
Page 220: Error Messages
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 221: Error Message Elimination
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 856OA/856lB/8563A Spectrum Analyzer Operating and Programming Manual Refer to the for information on programming the analyzer.
Page 222: Adc Errors (200 To 299)
124 NOP IBLK I-block format not valid here. 125 NOP STRNG Strings are not valid for this command. 126 NO ? This command cannot be queried. 127 BAD DTMD Not a valid peak detector mode. 128 PK WHAT? Not a valid peak search parameter. 129 PRE TERM Premature A-block termination.
Page 223: Lo And Rf Hardware/Firmware Failures (300 To 399)
LO and RF Hardware/Firmware Failures (300 to 399) YTO Loop Errors (300 to 301) These errors often require troubleshooting the Al4 Frequency Control assembly (Synthesizer Section) or the ADC circuits. 300 YTO UNLK YTO (1st LO) L oo is unlocked. The ADC measures YTO-ERR voltage under phase-lock condition.
Page 224 307 FREQ ACC Transfer oscillator pretuned DAC out of range. The transfer oscillator pretune procedure attempts to find pretuned DAC values by programming the PLL to 25 different frequencies and incrementing the transfer oscillator pretune DAC until XFRSENSE changes polarity. ERR 307 is set if the DAC is set to 255 (maximum) before XFRSENSE changes polarity.
Page 225: Yto Loop Errors (317 To 318)
315 FREQ ACC Indicates problems in the span calibration. Troubleshoot any unlocks before attempting to troubleshoot span calibration problems, because the loops must all lock in order to perform the calibration. If LO spans greater than 1 MHz are correct, check A14U114B , A14U115A, A14U116, or A14QlOl.
Page 226: Yto Loop Errors (331)
Unable to adjust MAINSENSE 1 c ose to 0 volts using the coarse adjust 324 FREQ ACC DAC. The coarse adjust and fine adjust DAC are used together to set MAINSENSE to 0 volts with the loop opened. ERR 324 is set if the coarse adjust DAC cannot bring MAINSENSE close enough to 0 volts for the fine adjust DACs to bring MAINSENSE to exactly 0 volts.
Page 227: Yto Leveling Loop (334)
YTO Leveling Loop (334) This error often requires troubleshooting the Al4 Frequency Control assembly or A7 LODA (Synthesizer Section) or the ADC circuits. 334 LO AMPL 1ST LO Distribution Amplifier is unleveled. This error is usually accompanied by error codes 300 or 301. ERR 301 YTO UNLK is cleared once ERR 334 has been cleared.
Page 228 3. If ERR 581 or ERR 582 appears, the fault is most likely caused by the Cal Oscillator. Refer to errors 581 and 582. 4. If ERR 581 or ERR 582 does not appear, troubleshoot the A5 IF assembly. Multiple IF Errors During IF adjust: If a FULL IF ADJ sequence (pressing ICAL) and FULL IF ADJ ) results in IF errors while displaying...
Page 229 425 RBW 3K Unable to adjust 3 kHz Resolution Bandwidth in first XTAL pole. 426 RBW 3K Unable to adjust 3 kHz Resolution Bandwidth in second XTAL pole. 427 RBW 3K Unable to adjust 3 kHz Resolution Bandwidth in third XTAL pole. 428 RBW 3K Unable to adjust 3 kHz Resolution Bandwidth in Fourth XTAL pole.
Page 230 460 AMPL Unable to adjust first step gain stage. Lin to log conversion AMPLG. 461 AMPL Unable to adjust second step gain stage. Lin to log conversion AMPL7. 462 AMPL Unable to adjust second step Gain stage. Lin to log conversion AMPL8.
Page 231 495 RBW IOK Unable to adjust 10 kHz Resolution Bandwidth. XTAL SWP GAIN 496 RBW 100 Unable to adjust 100 Hz Resolution Bandwidth. Inadequate Q, 497 RBW 100 Unable to adjust 100 Hz Resolution Bandwidth. Alignment problem. 498 RBW 100 Unable to adjust 100 Hz Resolution Bandwidth.
Page 232 510 AMPL .3M Unable to adjust amplitude of 300 kHz Resolution Bandwidth. Insufficient gain during LC BW Cal. 511 AMPL IM Unable to adjust amplitude of 1 MHz Resolution Bandwidth. Insufficient gain during LC BW Cal. 512 RBW 100 Unable to adjust 100 Hz Resolution Bandwidth. Insufficient gain during crystal BW Cal.
Page 233 531 RBW (300 Flatness correction data for Resolution Bandwidths <300 Hz not acceptable. 532 RBW <300 Absolute gain data for Resolution Bandwidths ~300 Hz not acceptable. 533 RBW <300 ADC timeout using <300 Hz Resolution Bandwidth. 534 RBW (300 Unable to do frequency count of CAL OSC using IF down-converter. 535 RBW <300 Unable to obtain adequate FM demod range to measure 500 Hz IF filter.
Page 234 564 LOG AMPL Unable to adjust amplitude of log scale. No compression in CalLogPower . 565 LOG AMPL Unable to adjust amplitude of log scale. Gain compression error in CalLogPower. 566 LOG AMPL Unable to adjust amplitude of log scale. Unable to set LOG CAL LVL in CalLogPower 567 LOG AMPL Unable to adjust amplitude of log scale.
Page 235 582 AMPL Unable to adjust 100 kHz and 210 kHz Resolution Bandwidths. 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 50R. 2.
Page 236: System Errors (600 To 651)
Faults on the A2 Controller assembly can cause these errors. Refer to Chapter 9, “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. General Troubleshooting 6-3 1...
Page 237: Program Rom Check-Sum Errors (705 To 710)
ROM, an error code is generated. If a defective programmed ROM is found, replace it with another ROM with the same HP part number. Refer to Chapter 4, “Replaceable Parts.” Although some of these errors might result in a blanked display, it is possible to read these errors over HP-IB.
Page 238: Ram Check Errors (711 To 719)
ROM U309 Check-sum error of program ROM A2U309. 709 ROM U310 Check-sum error of program ROM A2U310. 710 ROM U311 Check-sum error of program ROM A2U311. RAM Check Errors (711 to 719) The instrument power-on diagnostics check the program RAM. This includes the two RAMS used for STATE storage.
Page 239: Model Number Error (719)
BCD overflow. Option Module Errors (800 to 899) 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 240: Block Diagram Description
Block Diagram Description The spectrum analyzer is comprised of the six main sections listed below. See Figure 6-4. 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 7 through 12.
Page 241: Rf Section
Al4 Frequency Control and Al5 RF assemblies. The HP 8560A Spectrum Analyzer uses triple conversion to produce the 10.7 MHz IF and a fourth conversion used only in 100 Hz, 30 Hz, and 10 Hz resolution bandwidths. A8 Low Band Mixer up-converts the RF input to a first IF of 3.9107 GHz.
Page 242: A15Al Second If Distribution Amplifier (P/O A15)
Al3 Second Converter The Al3 Second Converter down-converts the 3.9107 GHz 1st IF to a 310.7 MHz 2nd IF. The converter generates a 3.6 GHz second LO by multiplying a 600 MHz reference. Bandpass filters remove unwanted harmonics of the 600 MHz driving signal. First IF and 2nd LO signals are filtered by cavity filters.
Page 243: Reference Pll (P/O A15)
Spanwidth Sweep Applied 20.1 MHz 3.8107 GHz All YTO’s main coil 1.01 MHz to 20.0 MHz All YTO’s FM coil 100 kHz to 1 MHz Roller Oscillator PLL’s Main Oscillator 100 Hz to 100 kHz Roller Oscillator PLL’s Offset Oscillator When the sweep ramp is applied to one of the PLLs, the analyzer must prevent this loop from trying to compensate for changes in the output frequency.
Page 244: Roller Oscillator Pll (P/O A14)
,- Y T O PLL7 / R O L L E R O S C I L L A T O R P L L \ 1ST L O O U T P U T 3.0 - 6.81 GHz Y T O / O F F S E T L O C K LOOP? 10 M H z T C X O S K 1 6 8...
Page 245: A5 If Assembly
The HP 8560A uses trace-data manipulation to generate the 5 dB/DIV scale from the 10 dB/DIV scale. The A3 Interface Assembly amplifies and offsets the 10 dB/DIV video to generate the 2 dB/DIV scale. The 1 dB/DIV scale is generated from the 2 dB/DIV scale through trace data manipulation.
Page 246: Adc/Interface Section
An Automatic IF Adjustment, in analyzer firmware, sets center frequency and 3 dB bandwidth of all filter poles through varactor and PIN diodes. The firmware also controls crystal-pole symmetry and the step gain amplification. ADC/Interface Section The ADC/Interface Section is the link between the Controller Section and the rest of the spectrum analyzer.
Page 247: Adc
Triggering The HP 8560A has five trigger modes: free run, single, external, video, and line. The Free Run and Single trigger signal comes from the 1 MHz ADC clock. The line trigger signal comes from the A6 Power Supply. Video triggering originates from A3’s video filter buffer circuit.
Page 248: Eerom
EEROM The EEROM stores important amplitude-related correction data. This includes data for mixer-bias DACs, and RF Gain DACs (flatness correction). The analyzer serial number, model number, and installed options are also stored in EEROM. Firmware The analyzer firmware reads the model number and installed options from the EEROM to determine how to respond to certain keystrokes.
Page 249 6-44 General Troubleshooting...
Page 254 ADC/lnterface Section The ADC/Interface Section includes the AlAl Keyboard, AlA RPG (rotary pulse generator), and A3 Interface assemblies. Table 7-l lists signal versus pin numbers for control cable W2. Troubleshooting Using the TAM ............7-4 Automatic Fault Isolation .
Page 255 Table 7-1. W2 Control Cable Connections (1 of 2) Signal A3J2 (pins) A4J2 (pins) A5J2 (pins) A14J2 (pins) A15J2 (pins, D GND D GND D GND D D GND LRF_STB LFC-STB LIF-STB CAL OSC TUNE LLOG-STB VCMON D GND RT PULSE HSCAN D GND tESERVED...
Page 256 Table 7-1. W2 Control Cable Connections (2 of 2) A5J2 43J2 (pins) A4J2 (pins) (pins) 114J2 (pins) Signal A GND SCAN RAMP VIDEO TRIGGER A GND R/T DAC2 R/T DACl * Indicates signal source connectors ADC/lnterface Section 7-3...
Page 257: Troubleshooting Using The Tam
Troubleshooting Using the TAM When using Automatic Fault Isolation, the TAM indicates suspected circuits that need to be manually checked. Use Table 7-2 to locate the manual procedure. Table 7-3 lists assembly test connectors associated with each Manual Probe Troubleshooting test.
Page 258: Automatic Fault Isolation References
Table 7-2. Automatic Fault Isolation References Manual Procedure to Perform Suspected Circuit Indicated by Automatic Fault Isolation \DC ASM 3heck ADC ASM 1DC MUX Check ADC MUX ‘LDC Start/Stop Control 2heck ADC Start/Stop Control iutomatic Check Analog Bus Drivers pault Isolation (in this chapter) inalog Bus Drivers lutomatic...
Page 259: Tam Tests Versus A3 Test Connectors
Table 7-3. TAM Tests Versus A3 Test Connectors Manual Connector Probe Measured Signal Lines Troubleshooting Test Video Input to Interface A3J105 Video to Rear Panel Video MUX LOG Offset/LOG Expand MSl, MS3 Video Filter Buffer Amp. MS3, MS5, OS1 Video Peak Detectors MS5, MS6 ADC MUX Variable Gain Amplifier...
Page 260: Keyboard/Rpg Problems
Keyboard/RPG Problems Keyboard Interface See function block G of A3 Interface Assembly Schematic Diagram (sheet 3 of 6). 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. The CPU determines the key pressed by setting only one keyboard scan line (LKSCNO through LKSCN5) low through U602 and reading the keyboard sense lines.
Page 261: Rpg Interface
RPG Interface See function block J of A3 Interface Assembly Schematic Diagram (sheet 3 of 6). U608B latches the RPG direction from the two RPG outputs, RPG-01 and RPG-02. Counterclockwise RPG rotation produces low-going pulses which result in a high output on U608B.
Page 262: Triggering Problems
Table 7-5. Counter Frequencies A3U606 pin # Nominal Frequency (Hz) 3900 1950 Triggering Problems See function block H of A3 Interface Assembly Schematic Diagram (sheet 3 of 6). The 1 MHz ADC clock provides synchronization in FREE RUN and SINGLE triggering. LINE triggering synchronization originates on the A6 Power Supply.
Page 263 8. If the voltage changes incorrectly, proceed as follows: a. Check the -10 Vdc reference (A3U409 pin 4). b. While using the front-panel knob to adjust the video trigger level, check for the presence of pulses on A3U409 pin 15 (LDAC2). c.
Page 264: Flatness Control (Rf Gain Dacs)
Flatness Control (RF Gain DACs) See function block M of A3 Interface Assembly Schematic Diagram (sheet 4 of 6). RF Gain DACs control the Al5 assembly’s flatness compensation amplifiers. The RF Gain DACs are arranged so that the output of one DAC is the voltage reference for the other DAC. This results in an RF GAIN voltage which is exponentially proportional to the DAC settings.
Page 265: A3 Assembly's Video Circuits
2. Connect W26 to A2J4. 3. Set the HP 8560A to the following settings: SPAN ............OHz SWEEP TIME .
Page 266 The on-screen amplitude level will probably not change as expected, since the Note video circuitry is assumed to be faulty. 15. Monitor A3TP14 while stepping the reference level from -10 dBm to +30 dBm. If the voltage does not step approximately 100 mV per 10 dB step, refer to “Video MUX” in this chapter.
Page 267: Log Offset/Log Expand
............50 Hz 4. Set the HP 8560A sweep time to 50 ms.
Page 268: Video Mux
See function block V of A3 Interface Assembly Schematic Diagram (sheet 5 of 6). The HP 8560A 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 269: Video Filter Buffer Amplifier
4. Step the Video BW down to .1 Hz. At each step, the amplitude of the LO feedthrough should decrease. 5. Refer to Table 7-7 and check for correct latch settings for the selected video bandwidth setting. 6. If latch A3U102’s output is not correct, trigger an oscilloscope on LLOGSTB (UlO2 pin 9) and monitor U102 pin 1 and other latch inputs while changing the video bandwidth.
Page 270: Positive/Negative Peak Detectors
LOG dB/DIV ..........10 dB/div 2. If the HP 8560A does not meet the conditions in steps a through e below, the positive and negative peak detectors are probably faulty.
Page 271: Peak Detector Reset
Peak Detector Reset See function block R of A3 Interface Assembly Schematic Diagram (sheet 4 of 6). 1. Press (PRESET] on the HP 8560A and set the controls as follows: C E N T E R F R E Q .
Page 272: Adc Mux
1. Press (%?i) on the HP 8560A and set the controls as follows: C E N T E R F R E Q ..........300 MHz SPAN .
Page 273: Logic Levels At A3U108
NEG PEAK 5. Set the HP 8560A to the following settings: SPAN ............lMHz SWEEP TIME .
Page 274: Variable Gain Amplifier (Vga)
Track and Hold See function block AC of A3 Interface Assembly Schematic Diagram (sheet 6 of 6). 1. Press [PRESET) on the HP 8560A and set the controls as follows: C E N T E R F R E Q .
Page 275: A3 Assembly's Adc Circuits
2. If a 10 MHz TTL signal is absent on W22, refer to the 10 MHz Reference (on the Al5 RF Assembly) troubleshooting procedure in Chapter 11. 3. Set the HP 8560A’s ISPAN) to zero. 4. Reconnect W22. 5. With an oscilloscope probe, monitor A3J401 pin 20.
Page 276: Adc Start/Stop Control
8. Press (PRESET) on the HP 8560A and set the controls as follows: SPAN ............OHz DETECTOR MODE .
Page 277: Adc
See function block F of A3 Interface Assembly Schematic Diagram (sheet 2 of 6). 1. Press (=I) on the HP 8560A and set the controls as follows: SPAN ............0 Hz SWEEP TIME .
Page 278: Ramp Counter
0 to 600. The ramp counter is incremented by HRST-PK-ENA. 1. Press [w) on the HP 8560A and set the controls as follows: SPAN ............lMHz DETECTOR MODE .
Page 279: A3 Assembly's Control Circuits
A digital control problem will cause the following three steps to fail. 1. On the HP 8560A, press (-1, ATTEN MAN, 0, a, and (dB. 2. A click should be heard after pressing dB in step 1, unless ATTEN was previously set to 70 dB.
Page 280: Analog Bus Timing
A3U407 goes low. 1. Press (PRESET) on the HP 8560A and set the controls as follows: ..........300 MHz C E N T E R F R E Q SPAN .
Page 281: Demultiplexer A3U410 Truth Table
13. Monitor A3U401 pin 9 (LV_STB) with an oscilloscope or logic probe. This is the strobe for the A4 Log Amplifier/Cal Oscillator assembly. 14. Press [w) and check that pulses occur when toggling between LINEAR LOG DB/DIV . Interface Strobe Select See function block K of A3 Interface Assembly Schematic Diagram (sheet 3 of 6).
Page 283 IF Section The IF Section contains the A4 Log Amplifier/Cal Oscillator and A5 IF assemblies. Troubleshooting Using the TAM ............8-3 Troubleshooting A4 Log Amplifier with the TAM .
Page 284 300 Hz to 3 kHz Resolution Bandwidth Out of Specification ......8-36 Low-Pass Filter ..............8-40 Sweep Generator .
Page 285: If Section
IF Section. Note HP 85629B Test and Adjustment Modules with firmware revisions A through F cannot make valid measurements on test connectors A4J9, A4J10, or A4Jll. A 4 L O G A M P...
Page 286: Automatic Fault Isolation References
Table 8-1. Automatic Fault Isolation References Suspected Circuit Indicated Manual Procedure to Perform by Automatic Fault Isolation Check Cal Oscillator on A4 Assembly Troubleshooting A4 Cal Osc with the TAM Check Input Switch on A5 IF Assembly Troubleshooting A5 with the TAM Linear Amplifiers Check Linear Amplifiers on A4 Assembly Refer to “Log Expand”...
Page 287: Tam Tests Versus Test Connectors (1 Of 2)
Table 8-2. TAM Tests Versus Test Connectors (1 of 2) Zonnector Manual Probe Troubleshooting Test Measured Signal Liner Video Input to Interface A3J105 Video to Rear Panel Video MUX Log Offset/Log Expand MSl,MS3 Video Filter Buffer Amplifier MS3, MS5, OS1 Video Peak Detectors MS5, MS6 ADC MUX...
Page 288: Tam Tests Versus Test Connectors (2 Of 2)
Table 8-2. TAM Tests Versus Test Connectors (2 of 2) Connector Manual Probe Troubleshooting Tes Measured Signal Liner A5J7 Ref 15 dB Attenuator Stage MSl, MS2, MS3 2nd Step Gain Stage MS2, MS3, MS4 2nd/3rd Step Gain Stage MS3, MS4, MS5 3rd Step Gain Stage MS4, MS5, MS6 Fine Atten/Srd XTL Pole...
Page 289: If Section Troubleshooting With Tam
~5 OdBm 1 0 . 7 M H z F A D J O F F .-mm----- C A L O S C +lV D C L ---------I I F A D J O F F W 5 4 D I S C O N N E C T E D ,‘-, ]+I- (RED)
Page 290: Troubleshooting A4 Cal Oscillator With The Tam
If a failure is indicated in the IF/LOG CHECK, press More Info to provide more detailed information about the detected failure. If an HP-IB printer is available, connect it to the analyzer HP-IB connector, then press Print Page for a hard copy output.
Page 291: Sweep Width Settings
Table 8-3. Sweep Width Settings Sweep Width Sweep Time RES BW RANGE MA1 MAO Adjusted 20 kHz 5 ms 10 kHz $5 V 10 kHz 10 ms 3 kHz 0 V +5v +5 V 4 kHz 30 ms 1 kHz +5 V +5 V 0 V 2 kHz 60 ms...
Page 292: Parameters Adjusted
Parameters Adjusted The following IF parameters are adjusted in the sequence listed: 1. Amplitude A. Video Offsets: analog (using A4 Log Amplifier video offset DAC) and digital (applying stored constant to all readings) 1. Linear Scale Offset 2. Log Scale Offset a.
Page 293: Requirements
B. 10 kHz resolution bandwidth 1. Center frequency of LC tank that loads the crystal 2. Symmetry adjustment to cancel crystal case capacitance. 3. Bandwidth C. 3 kHz resolution bandwidth: center frequency of LC tank and bandwidth of resolution bandwidth D.
Page 294: Available Reference Level Range
Performance Test Failures Failures in IF-Section-related performance tests may be investigated using the following information. IF Gain Uncertainty Performance Test 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 295: Scale Fidelity Performance Test
4. Set the signal generator controls as follows: Amplitude ........... . +lO dBm .
Page 296: Log Amplifier
5. Verify that this level is about -700 mV. 6. Adjust the reference level of the HP 8566A/B to place the signal at the reference level. 7. Reduce the input signal level in 10 dB steps while noting the voltage displayed on the DMM.
Page 297: Log Amplifier
10. If log fidelity is poor near the bottom of the screen or the 1 MHz resolution bandwidth is narrow, a fault might exist in the wide/narrow filter switch. Refer to function block G HP 856UA/6lB/63A Spectrum Analyzer of A4 Log Amplifier Schematic Diagram in the Component Level Information binder.
Page 298: Video Offset
Video Offset Refer to function block P of A4 Log Amplifier Schematic Diagram (sheet 3 of 4) in the HP 856OA/6lB/63A Spectrum Analyzer Component Level Information binder. The circuit provides a programmable video offset, with a step size of 5 mV, from -300 mV to +900 mV.
Page 299: Frequency Counter Prescaler/Conditioner
4. Set the HP 8566A/B to 4.8 kHz center frequency and 2 kHz span. 5. Connect the VIDEO OUTPUT (rear panel) of the spectrum analyzer through a 20 dB attenuator and dc block to the input of the HP 8566A/B. Set the sweep time of the 10 seconds.
Page 300: 4.8 Khz And 10.7 Mhz If Filters
3. Set the HP 8566A/B to 4.8 kHz center frequency and 2 kHz span. 4. Connect the VIDEO OUTPUT ( rear panel) of the 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 301: 10.6952 Mhz Vcxo
The amplitude at 4.5 kHz and 5.1 kHz relative to 4.8 kHz should be 0 to -2.5 dB.. 10.6952 MHz VCXO Refer to function block E of A4 Log Amplifier Schematic Diagram (sheet 2 of 4) in the HP 856OA/61B/63A Spectrum Analyzer Component Level Information binder.
Page 302: Synchronous Detector
Limiter Refer to function block G of A4 Log Amplifier Schematic Diagram (sheet 2 of 4) in the HP 856OA/61B/63A Spectrum Analyzer Component Level Information binder. The Limiter consists of 7 identical 20 dB gain stages. A “log narrow filter” is switched in for RBWs 5100 kHz.
Page 303: Log Offset/Gain Compensation
During digital resolution bandwidths the two signals are separated by 4.8 kHz. Log Offset/Gain Compensation Refer to function blocks L and M of A4 Log Amplifier Schematic Diagram (sheet 3 of 4) in the HP 856OA/61B/63A Spectrum Analyzer Component Level Information binder.
Page 304: A5 If Section
Caution For troubleshooting, it is recommended that you use an active probe, such as an 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...
Page 305: If Signature
2. Connect the source connection of a 3 dB power splitter to A5J5. (Minicircuits Model: ZSC J-2-l) Connect one output of the power splitter to the input of an HP 8566A/B Spectrum Analyzer. Connect the other output of the power splitter to cable W27 (coax 3).
Page 306 TRIGGER ............Single 4. On the HP 8566A/B press (SHIFT), (trace A blank) to set detector to SAMPLE mode. 5. On the spectrum analyzer, press [m) and set the controls as follows: CENTER FREQ .
Page 308: If Adjust Signature
R E F 1 0 . 0 ATTEN 2 S A M P L E C E N T E R 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 W P 5 0 0 msec...
Page 309: Detailed If Adjust Signature (5)
R E F 1 0 . 0 ATTEN 2 dB,’ S A M P L E C E N T E R 1 0 . 7 0 0 0 0 0 M H z S P A N 0 R E S B W 3 0 0 V B W S W P 1 .
Page 310: If Signature
Common IF Signature Problems Region A of Figure is noisy: Suspect the first LC pole. Region B of Figure is flat: Suspect the third step-gain stage, the fine attenuator, or the fourth LC-pole output amplifier. H Region C of Figure 8-4 has no dB step: Suspect the reference 15 dB attenuator.
Page 311: Noise With Correct Shape
R E F 1 0 . 0 ATTEN 2 0 S A M P L E C E N T E R 1 0 . 7 0 0 0 0 0 M H z S P A N Q 1 R E S B W 3 0 0 kHz V B W 3 0 0 kHz S W P 5 0 0 set...
Page 312: Region B Amplitude Offset
I”.; dBmi ATTEN dB,’ S A M P L E C E N T E R 1 0 . 7 0 0 0 0 0 MHz S P A N 0 H z 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 1...
Page 313: Faulty Crystal Short
*ATTEN l0dB R L O d B m lOdB/ C E N T E R 300.0000MHz S P A N 5 0 0 0kHz *RBW 1.0MHz V B W 1.0MHz S W P 5 0 m s S K 1 8 2 Figure 8-13.
Page 314: 30 Khz Resolution Bandwidth Problems
30 kHz Resolution Bandwidth Problems Shape factor too high: Shape factor is the ratio of the 60 dB bandwidth to the 3 dB bandwidth. Shape factor should be less than 15:l. If one of the LC poles malfunctions, the shape factor may be the only indication of the failure. Isolate the non-functioning pole with the IF signature.
Page 315: Faulty Crystal Symmetry
S K 1 8 4 Figure 8-15. Faulty Crystal Symmetry Step Gains Refer to function blocks B, H, and I of A5 IF Filter Schematic Diagram (sheets 1 of 3 and HP 856OA/61B/63A Spectrum Analyzer Component Level Information in the binder.
Page 316: A4 Assembly's Cal Oscillator Circuit
A4 Assembly’s Cal Oscillator Circuit 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 317: Cal Oscillator Unlock At Beginning Of If Adjust
Y. See Figure 8-23, Cal Oscillator Block Diagram. Inadequate CAL OSC AMPTD Range Refer to function block AC of A4 Calibration Oscillator Schematic Diagram in the HP 856OA/61B/63A Spectrum Analyzer Component Level Information binder. 1. If A4R826, CAL OSC AMPTD, has inadequate range to perform the IF Amplitude Adjustment, press LCAL).
Page 318: Hz To 3 Khz Resolution Bandwidth Out Of Specification
3. Connect the source connection of a 3 dB power splitter (Minicircuits Model: ZSC J-2-l) to A4J8. Connect one output of the power splitter to the input of an HP 8566A/B Spectrum Analyzer. Connect the other output of the power splitter to cable W52 (coax...
Page 320: Output Waveform, 3 Khz Resolution Bandwidth
ATTEN 1 R E F - 4 3 . 0 1 dB,’ C E N T E R S P A N 0 1 0 . 8 0 0 0 0 0 M H z V B W S W P 5 0 .
Page 321: Output Waveform, 300 Hz Resolution Bandwidth
R E F - 4 3 . 0 ATTEN 1 1 dB/ i \, \ -& \ L- \ ‘- \, - ‘\ L \ - \ ~A& C E N T E R 1 0 . 7 1 0 0 0 0 M H z S P A N 0 RES B W 1 0 kHz V B W...
Page 322: Sweep Generator
AM/FM Demodulation, Audio Amplifier, and Speaker Refer to function blocks R, S, and T of A4 Cal Oscillator Schematic (sheet 4 of 4) Diagram in HP 856OA/61 B/63A Spectrum Analyzer Component Level Information binder. If the audio circuits are not functioning use the following procedure to isolate the problem.
Page 323 3. Adjust the spectrum analyzer reference level and center frequency to display the 400 Hz modulation frequency eight divisions peak-to-peak. 4. On the spectrum analyzer press (mCTRL), AM/FM DEMOD , AM DEMOD ON, and set the sweep time to 5 seconds. 5.
Page 324 8-42 IF Section...
Page 328: Troubleshooting Using The Tam
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 ............9-l Blank Display .
Page 329: Tam Tests Versus Test Connectors
Use the following procedure if the instrument’s display is blank. This procedure substitutes an HP-IB printer for the display. 1. Connect the printer to the HP 8560A and set the printer’s address to the value required by the TAM. This is usually 1.
Page 330 CONTROLLER TEST SPi7 C O N N E C T O R ) Figure 9-1. A2 Test Connectors 10. Press SOFT KEY #4. The results will be sent to the printer. 11. If a failure is indicated in any of these tests, the fault lies on the A2 Controller assembly. To obtain more information: a.
Page 331: Digital Signature Analysis (Dsa)
Al and ending with A23) should be one-half the frequency of the previous line. 6. If step 4 reveals problems, microprocessor A2Ul is probably faulty. 7. Set the HP 8560A’s LINE switch off. Replace jumper A2El. Move the DSA jumper from connecting E5 and E6 to connecting E6 and E7.
Page 332: Blanking
5. Compare the signals at the following test points with those illustrated in Figure 9-2. A2J202 pin 14 X POS: Y POS: A2J202 pin 3 Z OUT: A2J201 pin 3 BLANKING: A2J202 pin 15 Note Waveforms displayed on an analog scope may show considerably more spikes. This is normal and is due to the wider displayed bandwidth.
Page 333: Blanking Waveforms
4. Compare the blanking-circuit input signals at the following test points with those illustrated in Figure 9-3. BLANKING: J202 pin 15 BLANK: U214 pin 12 VECTOR: U214 pin 11 U213 pin 13 5. The waveforms in Figure 9-3 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 334: Display Jumbled Or Trace Off Screen
4 . 0 0 V/div 2 . 5 0 V 2 . 0 us/div 9 6 . 0 0 u213-13 B L A N K I N G S K 1 9 3 Figure 9-4. Expanded Blanking Waveforms Display Jumbled or Trace Off Screen See function blocks D and I of A2 Controller Schematic Diagram (sheet 1 of 4) in the Component-Level Information binder.
Page 335: Switch Driver Waveform Lchar
1 0 . 0 V/div 0 0 v 2 0 0 us/div 0 . 0 0 0 s I N T E G R A T E S A M P L E L C H A R V E C T O R SK194 Figure 9-5.
Page 336: Distorted X/Y Line Generator Waveforms
13. Figure 9-8 illustrates the waveforms of properly working line generators. Whenever there is a pulse on TPl or TP2, the appropriate integrator (U201B or U203B) generates a ramp (the output vector) which feeds back to U201A (U203A) and shows on its output. 5 .
Page 337: Intensity
a 0 0 v/dIv 0 . 0 0 v 1 0 . 0 us/div 0 . 0 0 0 s U201A-1 T P 2 U203A- 1 S K 1 9 7 Figure 9-8. Normal X/Y Line Generator Waveforms Intensity The length of the vector being drawn can effect intensity (U210A, U21OC, and U2lOD). Refer to “Long Lines Dimmer Than Short Lines”...
Page 338: Long Lines Dimmer Than Short Lines
Long Lines Dimmer Than Short Lines See function block M of A2 Controller Schematic Diagram (sheet 1 of 4) in the HP 856OA/61B/63A 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.
Page 339: Analog Zero-Span Problems
In these settings, DEFl causes switching between the line generators and the analog inputs (sweep and video). DEFl remains high when the CRT adjust pattern is on. Refer to function block M of the A2 Controller Schematic, HP 856OA/61B/63A Spectrum Analyzer Component Level Information sheet in the binder.
Page 340: Frequency-Count Marker Problems
A2 Controller assembly: Disconnect W53 from A2J7. Connect the output of a synthesized source, such as an HP 3335A, to A2J7. Set the synthesized source to the following settings: Amplitude ........... . +lO dBm .
Page 341: Frequency Counter
Frequency Counter See function block 2 of A2 Controller Schematic Diagram (sheet 4 of 4) in the Component-Level Information binder. 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’s ADC (Analog to Digital Converter).
Page 342: State- And Trace-Storage Problems
Reconnect W22 to A2J8. b. Set the HP 8560A to the following settings: SPAN ........... ..Zero Span SWEEP TIME .
Page 343: Keyboard Problems
CRT changed according to the program, the A2 Controller assembly is working properly. Refer to Chapter 7, “ADC/Interface.” 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 345 Synthesizer Section The Synthesizer Section includes the A7 First LO Distribution Amplifier, 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. Page Confirming a Faulty Synthesizer Section .
Page 346: Confirming A Faulty Synthesizer Section
(HP 11240B) b t e ween the active probe and the spectrum-analyzer input. Confirming a Faulty Synthesizer Section The All YTO (the HP 8560A’s first LO) is a Yig-Tuned Oscillator which tunes from 2.95 to 6.8107 GHz. The A7 1ST LO Distribution Amplifier (LODA) levels All’s output and distributes the signal to the A8 Low Band Mixer, A15A2 Sampler, and the front panel’s 1ST...
Page 347: L. Center Frequency Tuning Values
2. Set the HP 8560A to the following settings: SPAN ............OHz .
Page 348 SPAN ............0 Hz Connect a power meter directly to the output of the All YTO. Press the HP 8560A’s step-up key and measure the YTO output power at each step. Check that All YTO’s output power is between f9 and +13 dBm.
Page 349: L. Yto Loop Test Setup
19. Connect a frequency counter to A15JlOl. Connect a high-frequency test cable from an HP 8340A/B Synthesized Sweeper to A15A2Jl. See Figure 10-2. 20. Connect a BNC cable from the HP 8560A’s 10 MHz REF IN/OUT to the HP 8340A/B’s FREQUENCY STANDARD EXT input.
Page 350: Sampler And Sampling Oscillator Test Setup
SINGLE. 28. Set the HP 8560A’s trigger to 29. Move jumper A14J23 to the TEST position. 30. Disconnect W34 from A15A2Jl and measure the power of the signal at the end of W34.
Page 351: Sampling Oscillator Test Frequencies
YTO to be controlled only by the Main Coil Tune DAC. Synthesizer Section troubleshooting is best done with the HP 8560A’s SPAN set to 0 Hz (even though it is still possible to sweep the Main and FM coils of the YTO).
Page 352: Al4 And Al5 Test Connectors
(CAL), MORE, FREQ DIAGNOSE, LO FREQ . To display the nominal YTO’s frequency, press Table 10-3. YTO Frequency in TEST Position Roller Oscillator Frequency YTO Pretune Accuracy Nominal YTO Frequency -104 to -93 MHz +30/-10 MHz LO Frequency +lO MHz -93 to -73 MHz LO Frequency to -65 MHz...
Page 353: Automatic Fault Isolation References (1 Of 2)
Table 10-4. Automatic Fault isolation References (1 of 2) Suspected Circuit Indicated Manual Procedure to Perform by Automatic Fault Isolation Check the YTO Loop Check 1st LO Confirming a Faulty Synthesizer Section (steps 9-11) (steps 10-13) Check 1st LO Pretune Frequency and Amplitude Unlocked YTO PLL (steps l-6) Check 3rd LO Drive...
Page 354: Automatic Fault Isolation References (2 Of 2)
Table 10-4. Automatic Fault Isolation References (2 of 2) Suspected Circuit Indicated Manual Procedure to Perform by Automatic Fault Isolation (steps 14-18) Check Offset Oscillator PLL Offset Oscillator PLL (steps 9-13) Check Offset Oscillator PLL Pre-Scaler Offset Oscillator PLL (steps 4-8) Check Offset Oscillator Pretune Circuitry Offset Oscillator PLL (step 8)
Page 355: Tam Tests Versus Test Connectors
Table 10-5. TAM Tests versus Test Connectors (1 of 2) Connector Manual Probe Troubleshooting Test Measured Signal Line, A14J 15 Sweep Generator Span Attenuator DAC Span Attenuator Switches Sweep + Tune Mult Input Amp MSl, OS1 Sweep + Tune Mult Input Switches MSl, MS3 VCO Sweep Driver MS6, OS1...
Page 356 Table 10-5. TAM Tests versus Test Connectors (2 of 2) Connector Manual Probe Troubleshooting Test Measured Signal Lines A14J303 XFER Amp Bias Main Amp Bias Out Amp Bias Main Osc Bias Main Pretune DAC Course Adj DAC Fine Adj DAC Span Multiplier DAC A15J200 Positive 15 Volt Supply Sampler Drive Buffer Bias...
Page 357: General Pll Troubleshooting
General PLL Troubleshooting The Synthesizer Section relies heavily on Phase-Lock Loops (PLL). Typically, faulty PLL’s are either locked at the wrong frequency or unlocked. The information below applies to troubleshooting these two classes of problems on a generalized PLL. PLL Locked at Wrong Frequency Numbers in the following text identify items in Figure 10-4.
Page 358: Unlocked Pll
1. The loop integrator’s output voltage (1) should be attempting to tune the oscillator to the correct frequency. a. The voltage at (1) should increase as the frequency increases on the following PLLs: YTO PLL A14J17 pin 1 (YTO LOOP ERROR) Reference PLL A15J502 pin 3 (LO3 ERR) Sampler PLL...
Page 359: Sweep Signal Destination Versus Span
Frequency Span Accuracy Problems The HP 8560A employs lock-and-roll tuning to sweep the 1st LO. The 1st LO is locked to the start frequency immediately after the previous sweep has been completed. The 1st LO is then unlocked, and, when a trigger signal is detected, the 1st LO sweeps (rolls).
Page 360: Confirming Span Problems
2. 2. Set the HP 8560A to the following settings: START FREQ ..........lO MHz .
Page 361: Settings Of Sweep Switches
On the HP 8560A press 9. Remove jumper A14J23 and connect a dc voltage source to A14J23 pin 2. 10. Connect a microwave frequency-counter or spectrum analyzer to the HP 8560A’s 1ST LO OUTPUT. 11. Set the dc-voltage source’s output for 0 Vdc and note the 1st LO frequency.
Page 362: Roller Oscillator Span Problems (Lo Spans 51 Mhz
13. The voltage at A14U332 pin 2 should be approximately 19% of the voltage at A14523 pin 2. 14. If the 1st LO frequency did not change in step 12, set the HP 8560A’s (LINE) switch OFF and disconnect WlO from A14J3.
Page 363: Input To Main/Fm/Vco Sweep Switch
3. If A14J17 pin 1 does not appear to be correct, verify that the sweep ramp is reaching the Main/FM/VCO Sweep Switch as follows: Change the oscilloscope’s amplitude scale to 1.25 V/d’iv and monitor the A14J15 pin 14. The waveform should be a 0 V to -10 V sweep of 50 ms duration. See Figure 10-7. Check for a 0 V to -10 V ramp at A14J15 pin 13.
Page 364 4. Set the HP 8560A to the following settings to open U324A and close U418C. This inverts the waveform at A14J15 pin 13. START FREQ ..........678.8 MHz SPAN .
Page 365: First Lo Span Problems (All Spans)
A 0 V to -10 V ramp should be present. 8. Change the HP 8560A’s span to 500 kHz and check for a 0 V to -5 V ramp at U323 pin 9. Change the HP 8560A’s span to 200 kHz and check for a 0 V to -2 V ramp at U323 pin 10.
Page 366 17. Set the HP 8560A’s sweep time to 100 ms. The voltage at 518 pin 4 should measure approximately -4.21 Vdc. 18. Set the HP 8560A’s sweep time to 200 ms. The voltage at 518 pin 4 should measure approximately -2.1 Vdc.
Page 367: Unlockedyto Pll
Unlocked YTO PLL Operation The All YTO is locked to two other oscillators, the Roller PLL’s Main Oscillator and the Offset PLL’s Sampling Oscillator. For LO spans of 1.01 MHz and above, either the FM or Main Coil of the YTO is swept directly. For LO spans of 1 MHz and below, the Roller PLL’s Main Oscillator is swept.
Page 368 negative Sampler IF’s, the Main Roller Oscillator must sweep from a higher frequency to a lower frequency. This is necessary since an increasing YTO frequency decreases the Sampler IF for negative Sampler IF’s. The opposite is true for positive Sampler IF’s, so in these cases, the Main.
Page 369: Troubleshooting An Unlocked Yto Pll
Sampler IF Troubleshooting an Unlocked YTO PLL 1. If the YTO PLL is unlocked, error code 301 should be displayed. Place the HP 8560A in ZERO SPAN. Figure 10-8 illustrates the simplified YTO PLL. 2. Move the jumper on A14523 to connect pins 2 and 3 (TEST position). Refer to Figure 10-3 for the location of A14523.
Page 370: Troubleshooting An Unlocked Yto Pll
5. Calculate the YTO’s frequency error by subtracting the frequency recorded in step 3 from the frequency recorded in step 4. Record the result below: YTO Frequency Error = YTO Frequency Error = YTO Frequency (MEASURED) -YTO FreqUenCy(CALCuLATED) On the HP 8560A, press Record the Main MORE, FREQ DIAGNOSE, MAIN ROLLER. Roller frequency below: Main Roller Frequency = MHz 7.
Page 371 8. If the YTO Frequency Error recorded in step 5 is less than 10 MHz, do the following: a. Measure the frequency at A14J304. The frequency should be equal to the frequency recorded in step 6. If not, refer to “Unlocked Roller Oscillator PLL” in this chapter. b.
Page 372: Yto Frequency Errors With A14J23 On Pins 2 And
19. Set jumper A14J23 to the TEST position and set the HP 8560A to the following settings: CENTER FREQ ...., ......2.9 GHz SPAN .
Page 373 25. Disconnect W32 from A15JlOl. Monitor the Sampler IF output (A15J101, SAMPLER IF) with a synthesized spectrum analyzer such as an HP 8568A/B or HP 8566A/B. 26. The Sampler IF should measure between 74 MHz and 114 MHz at -15 dBm to +2 dBm.
Page 374: Voltages In Fm Coil And Main Loop Drivers
3 3 . If the voltage monitored in step 23 is correct with a 0 dBm output but not with -15 dBm output, suspect A14U201 or A14U202. If the voltage does not change, check the YTO PLL Loop’s divide-by-two circuits as follows: Set the signal generator for an 80 MHz output.
Page 375: Main Coil Coarse And Fine Dacs Voltages
The DACs adjust the FM-coil current to zero before any sweep begins. Refer to function block I of Al4 Frequency Control Schematic (sheet 2 of 5). 42. Set the HP 8560A to the settings listed below. These set both DACs to 128 (the DAC setting range is 0 to 255).
Page 376: Unlocked Roller Oscillator Pll
Unlocked Roller Oscillator PLL Operation The Roller Oscillator is used in the HP 8560A as a reference for the 1st LO phase-lock loop. It provides the 25 Hz start-frequency resolution for the 1st LO, and is the means by which the 1st LO is swept in LO spans of 1 MHz or less (Roller spans).
Page 377: Offset Oscillator Pll
3. The oscillator’s power level, measured with an active probe at TP302, should measure - 1 5 dBm. 4. Set the HP 8560A to the following settings: C E N T E R F R E Q ..........300 MHz SPAN .
Page 378 MHz, connect a frequency counter to UlOl pin 3 (using a x10 oscilloscope probe). Place the counter in the high-input impedance function. 11. Set the HP 8560A to the following settings: C E N T E R F R E Q .
Page 379: Transfer Oscillator Pll
SPAN ............OHz 22. Check that the voltage at U112 pin 5 is the same as that on U112 pin 3. 23. Set the HP 8560A to a SPAN of 100 kHz. Note A14U112 is a sample-and-hold IC that stores the phase-lock error voltage during offset sweeps (5100 kHz).
Page 380 15. Confirm that U127 pin 1 is high. The signal amplitude at U127 pin 3 is 21 Vp-p. 16. Set the HP 8560A to the following settings: C E N T E R F R E Q ..........300MHz SPAN .
Page 381: Main Oscillator Pll
4. Confirm that the voltage at J303 pin 2, Main Osc Bias, is +8 Vdc fl V. 5. Set the HP 8560A to the following settings: ..........300 MHz C E N T E R F R E Q SPAN .
Page 382 13. If the Transfer Oscillator drive signal is not present, check the XFER AMP BIAS at J303 pin 3. The voltage should measure +2 Vdc to +4 Vdc. 14. Check that the voltage at U424B pin 7 is nominally -14 Vdc. Diodes CR302 and CR303 form a PIN diode switch that turns off the Transfer Oscillator drive to the mixer in Main Roller Spans (100 kHz <LO Span 51 MHz).
Page 383: Operation
Unlocked Offset Lock Loop (Sampling Oscillator) Operation The Offset Lock Loop drives the A15A2 Sampler. The Offset Lock Loop’s sampling oscillator tunes to one of fifteen discrete frequencies between 280 MHz and 298 MHz. Refer to Al5 Schematic (sheet 3 of 3). M ixer A15U400 mixes the oscillator’s output with 300 MHz from the Reference PLL, producing a 2 MHz to 20 MHz IF signal.
Page 384: Sampling Oscillator Pll Divide Ratios
Table 10-15. Sampling Oscillator PLL Divide Ratios Center Divide TP 406, N Control !klplitlg Control Oscillator Freq.* R a t i o s T P 4071 Lines Lines Freq. (MHz) (MHz) (MHz) 1 Bl 1 B2 I B3 I B4 I B5 INI M 1 280.0 high high high high low...
Page 385 +0.6 V to +2.2 V. 16. Set HP 8560A to the following settings: CENTER FREQ ..........369.3 MHz SPAN .
Page 386: Unlocked Reference Pll
3. If the oscillator begins to oscillate, the SAWR is probably defective. 4. On the HP 8560A, press (j), REAR PANEL, and 10 MHz INT . 5. Measuring tune line voltage (LO3 ERR) indicates if the Reference PLL is locked. Measure the voltage at A15J502 pin 3.
Page 387 Measure the signals at the following test points with an active probe/spectrum analyzer combination such as an HP 85024A/HP 8566A/B. The signal level at TP701 should be sufficient to drive an ECL input. TP506 50 MHz, >+3 dBm U502 pin 15 300 MHz,>+3 dBm...
Page 388: Third Lo Driver Amplifier
29. If the front-panel CAL OUTPUT amplitude is out of specification and cannot be brought within specification by adjusting A15R561, CAL AMPTD, check the Calibrator AGC Amplifier with the following steps. Refer to function block W of Al5 RF Schematic (sheet 3 of 4).
Page 389: Sampler And Sampler If
YTO loop. When the IF is between 78 and 87 MHz, PIN diodes switch a 120 MHz notch filter in the sampler IF section. 1. Set HP 8560A to the following settings: C E N T E R F R E Q .
Page 390 Sampler IF circuitry. Continue with the following steps. 9. Set the HP 8560A to the following settings: ..........300MHz C E N T E R F R E Q SPAN .
Page 391: Sweep Generator Circuit
Sweep Generator Circuit The Sweep Generator operates by feeding a constant current from DAC U307 into an integrator, U320B. See function block K of Al4 Frequency Control Schematic (sheet 2 of 5). This current is scaled by resistors R20 through R24 and U312B/C/D. See Figure 10-9. The capacitors used in the integrator depend on the sweep-time range;...
Page 392: Simplified Sweep Generator During Retrace
C14.Cl5.Cl6 C U R R E N T S O U R C E ’ I SWEEP C R 6 U308, RZO-R24 U312B/C/D 75oR R 2 9 U31 12A 5 2 6 K U312D S K 1 1 1 0 Figure 10-10.
Page 393: Simplified Synthesizer Section
w 3 4 R O L L E R B L A C K P L L ’ S ------ 6 0 0 MHz I h - - - e - - A P P R O X 0 dBm w 3 2 J304 GRAY/VIOLEl...
Page 394: Simplified Al4 Assembly Block Diagram
A l 5 - 1 5 OdBm J501 S A M P L E R /P/O A l 4 F R E Q U E N C Y C O N T R O L 1 Y T O L O O P Y T O L O O P ERROR TO FM COIL...
Page 395: Simplified Al5 Assembly Block Diagram
W 3 4 1ST L O S A M P J501 C A L O U T P U T T O F R O N T P A N E L T O S I G I D O S C I L L A T O R FRoM A7 LoDA >...
Page 396: A21 Ocxo (Option 003 Only
A21 OCXO (Option 003 only) Spectrum analyzers with Option 003, Precision Frequency Reference, use an oven-controlled crystal oscillator (OCXO) instead of the standard temperature compensated crystal oscillator (TCXO), 1oca e t d on the Al5 RF assembly. Jacks J305 and J306 on the Al5 RF assembly are located where the TCXO would normally be installed.
Page 399: Harmonic/Spurious Outputs Too High . . . . . . . . . . . . . . . . . 1
RF Section The RF Section converts the input signal to a 10.7 MHz IF (Intermediate Frequency). See Figure 11-5 for a detailed section block diagram. Note The block diagrams for the Al4 and Al5 assemblies are located in Chapter 10, Synthesizer Section.
Page 400: L. Al4 And Al5 Test Connectors
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, h aving dc coupled inputs, either set the active probe for an ac coupled output or use a dc blocking capacitor (HP 11240B) between the active probe and the spectrum analyzer input.
Page 401 Table 11-l. Automatic Fault Isolation References Procedure to Perform Suspected Circuit Indicated Manual 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 LODA (LO Distribution Amplifier)
Page 402: Tam Tests Versus Test Connectors
1. Disconnect all inputs from the front-panel INPUT 2. Set the HP 8560A to the following settings: ..........0 Hz C E N T E R F R E Q SPAN .
Page 403: Low Band Problems
Installation and Verification manual or use TAM functional test). 4. If the performance test fails, perform the First LO Distribution Amplifier adjustment located in Chapter 2. If the adjustment fails, set the HP 8560A to the following settings: C E N T E R F R E Q .
Page 404: A7 Loda (Lo Distribution Amplifier)
Caution Connecting or disconnecting the A7 LODA’s bias with the HP 8560A IuNE] switch on will destroy the A7 LODA. Always set the HP 8560A (LINE switch off before removing or reinstalling W12 to either the A7 LODA or A14JlO.
Page 405: Attenuator Pin Values
Verification Manual. 2. If there is a step-to-step error of approximately 10 dB or more, continue with step 3. ATTEN AUTO MAN 3. On the HP 8560A press [n), and until is underlined. 4. Step the RF ATTEN from 0 dB to 70 dB. A “click” should be heard at each step. The absence of a click indicates faulty attenuator drive circuitry.
Page 406: 11-8 Rf Section
Set the HP 8560A’s (LINE) switch off and disconnect W13 from A14J12. b. Set the HP 8560A’s (LINE] switch on and set the analyzer to the following settings: CENTER FREQ ..........300MHz SPAN .
Page 407: Synthesizer Section
Component-Level Information binder. 1. Set the HP 8560A to the following settings: ..........300 MHz CENTER FREQ SPAN .
Page 408: Al5 Rf Assembly
Amplitude adjustment in Chapter 2 of this manual. 3. If adjustment cannot be made, disconnect W35 from A15J801. 4. On the HP 8560A press (PRESET) and set the controls to the following settings: C E N T E R F R E Q .
Page 409: Confirming Third Converter Output
8. If a flat line is displayed within 2 dB of the reference level and the performance test failed, troubleshoot the Al5 RF Assembly. Confirming Third Converter Output 1. Connect the HP 8560A’s CAL OUTPUT to INPUT 50 a. 2. Set the HP 8560A to the following settings: C E N T E R F R E Q .
Page 410 The signal should measure approximately -10 dBm. If the signal level is incorrect, continue with step 13. 12. Enter #0 into the HP 8560A Flatness Data. The signal level at A15J601 should measure less than -32 dBm. This sets the gain of Flatness Compensation Amplifiers to a minimum (attenuators to maximum attenuation).
Page 411: Flatness Compensation Control
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 8560A is set to SIG ID ON, the SIG ID Oscillator turns on during alternate sweeps.
Page 412: 10 Mhz Reference
SAWR, and the circuit will begin to oscillate. 10 MHz Reference The HP 8560A 10 MHz reference consists of 10 MHz TCXO (Option 003: A21 OCXO) with associated TTL level generator and distribution amplifier. The TCXO and TTL level generator (or OCXO) are turned off when using an external 10 MHz reference. Also, with the analyzer set to EXTernal frequency reference, line receiver U304B is disabled and U304A is on.
Page 413: Mhz Reference At A15J302
If there is no problem with INTernal 10 MHz reference operation, check EXTernal 10 MHz reference operation as follows: Set the HP 8560A’s 10 MHz reference to external by pressing 10 MHz EXT . Connect a 10 MHz, -2 dBm, signal to the rear-panel 10 MHz REF IN/OUT connector.
Page 414: Mhz Ttl-Reference At U303 Pin 5
Graph V/div 1 . 0 0 v 5 0 . 0 ns/div 0 . 0 0 0 [Ghan A15J302 Figure 11-4. 10 MHz TTL Reference at U303 Pin 5 II-16 RF Section...
Page 415: Rf Section Mnemonic Table
Table 11-4 lists the RF Section mnemonics shown in Figure 11-5 and provides a brief description of each. Table 11-4. RF Section Mnemonic Table Mnemonic Description MAIN COIL+, MAIN COIL- YTO Main Coil Tune Signal FM+, FM- YTO FM Coil Tune Signal LO SENSE LO Amplitude Sense Voltage LEVEL ADJUST...
Page 416: A10 Tracking Generator (Option 002)
A10 Tracking Generator (Option 002) Block Diagram Description The A10 Tracking Generator consists of several smaller circuits. The A10 is not component-level repairable; a rebuilt exchange assembly is available. The block diagram of the tracking generator is unique in that it only recreates one of the spectrum analyzer’s intermediate frequencies.
Page 417: Output Amplifier
Output Amplifier The output amplifier low-pass filters the signal emerging from the Output Mixer and then amplifies it into a usable range. The amplifier also contains a detector for leveling the output. Bias Board The bias board contains the ALC circuitry for the tracking generator and distributes dc power from the Al4 Frequency Control Assembly to the rest of the tracking generator.
Page 418: Excessive Residual Fm
Either the tracking oscillator or the ALC circuitry could be responsible for excessive residual FM. The residual FM should be measured on another spectrum analyzer, such as an HP 8566A/B or HP 8568A/B, using slope detection with the HP 8560A set to zero span. Proceed as follows to troubleshoot residual FM problems: 1.
Page 419: Flatness Out-Of-Tolerance
(the “test analyzer”). Set the test analyzer to sweep from 300 kHz to 2.9 GHz, with a sweeptime of 100 msec or less. Set the HP 8560A to sweep from 300 kHz to 2.9 GHz with a 50 second sweeptime. Press (SGLSWP) on the HP 8560A and observe any responses on the test analyzer, ignoring the desired output signal.
Page 420: Harmonic/Spurious Outputs Too High
1st LO and the 600 MHz drive signals using another spectrum analyzer. When checking the 1st LO, the HP 8560A must be set to zero span. Press ICAL), MORE I OF 2, FREQ DIAGNOSE, LO FREQ to determine the 1st LO frequency.
Page 421: Power Sweep Not Functioning Properly
BLANKING output of the HP 8560A. Set the POWER SWEEP RANGE to 12.8 dB and TRK GEN RF POWER to -10 dBm. Set the HP 8560A SWEEPTIME to 50 ms. A 0 to +lO V ramp should be observed on the oscilloscope. The amplitude of the ramp should decrease approximately 780 mV for each 1 dB decrease in POWER SWEEP RANGE.
Page 422 Setup the HP 8560A as indicated in the Tracking Oscillator Range Adjustment procedure, using a spectrum analyzer, such as an HP 8566A/B, in place of the frequency counter. Try to adjust AlOC3 until a signal is displayed on the HP 8566A/B. If adjusting AlOC3 does not start the tracking oscillator functioning, the A10 Tracking Generator is suspect.
Page 424 Display/Power Supply Section The Display/Power Supply Section contains the A6 Power Supply, A6Al HV Module, Al7 CRT Driver, and Al8 CRT. Figure 12-1 illustrates the section block diagram. Table 12-1 lists signal versus pin numbers for Power Cable Wl. P a g e Troubleshooting Using the TAM .
Page 425: L. Simplified Section Block Diagram
F R O N T P A N E L L E D F A N ‘OWER SUPPLi’ - 1 2 6 4SSEMBLY 110/220 - 1 5 V O L T A G E L I N E F L 4 ^,.,, _r S E L E C T O R >WI ILH...
Page 426: Wl Power-Cable Connections (1 Of 2)
Table 12-1. Wl Power-Cable Connections (1 of 2) Signal A2J1 A3J1 A4J1 A5J1 A6Jl A14J1 A15J1 (pins (pins (pins (pins (pins (pins (pins A GND A GND A GND SCAN RAMF A GND -12.6 V - 1 5 V 14” A GND - 1 5 V f15 V...
Page 427: Automatic Fault Isolation References
Table 12-1. Wl Power-Cable Connections (2 of 2) Signal A2Jl A3Jl A4Jl A5Jl 46Jl- 414J1 415Jl :pins) :pins) :pins) :pins) :pins) (Pins) (Pins) $5 V 4 0 * $5 v $5 V +5 V +5 V +5 V LINE TRIGGER +15 V +15 V - 1 5 V...
Page 428: Blank Display
Use the following procedure if the instrument’s display is blank. This procedure substitutes an HP-IB printer for the display. 1. Connect the printer to the HP 8560A and set the printer’s address to the value required by the TAM. This is usually 1.
Page 429: Blank Display
SOFT KEY 9. Move the probe cable to A2J201, press #l and wait five seconds. SOFT 16. Press . The results will be sent to the printer. 11. If a failure is indicated in any of these tests, the fault lies on the A2 Controller assembly. to obtain more information: a.
Page 430: Display Distortion
CRT Driver, or A18Vl CRT might be at fault. Display Distortion The HP 8560A 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 431: Focus Problems
If the line generator or fast zero-span portion of the adjustment fails, troubleshoot the A2 assembly. 4. If the adjustments do not remedy the problem, set the HP 8560A’s (LINE) switch off and place the Al7 CRT Driver in the service position.
Page 432: Intensity Problems
6. 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 A17J7( 10). 7. The nominal A17J7(10) voltage is -1600 Vdc, but the CRT will function with this voltage within 200 V of -1600 Vdc.
Page 433 60 V range to account for tube variations, and achieve proper intensity. 8. If the grid and cathode voltages are correct, turn off the HP 8560A and check A17CRlO with an ohmmeter. If A17CRlO is good, suspect the A18Vl CRT.
Page 434: A6 Power Supply Assembly
A6 Power Supply Assembly The HP 8560A 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 435: Buck Regulator Waveform
11. If there are pulses at TP206, or there are pulses at TP210, but not at TP206, the Buck Regulator Control circuitry is probably faulty. 12. Disconnect the power cord from the HP 8560A. 13. Connect the positive output of a current-limited dc power supply to the cathode of A6CR201 and the ground to A6TP201.
Page 436: Line Fuse Blowing
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 HP 8560A is turned on, disconnect the power cord and lift the drain of A6QlO2 from TP108. If the line fuse still blows, suspect U102.
Page 437: High Voltage Supplies
9. If the voltages do not return to near their nominal range, the A6 Power Supply is probably at fault. 10. If the +5 V supply is low, suspect the feedback circuit. Measure the voltage of the +5 V reference (U305 pin 5) and the f7.5 V references (U306B pin 7 and U306D pin 14). 11.
Page 438: Crt Supply Dropping Out
CRT Supply Dropping Out See function block K of A6 Power Supply Schematic Diagram in the Component-Level Information binder. The CRT Supply is a separate switching supply which provides the +llO Vdc for the Al7 CRT Driver from a winding on the A6Al HV Module. The CRT Supply operates at approximately 30 kHz.
Page 439: Buck Regulator Control
Buck Regulator Control See function block H of A6 Power Supply Schematic Diagram in the Component-Level Information binder. The Buck Regulator Control pulse-width modulates the Buck Regulator and provides a synchronized signal to the DC-DC Converter Control circuitry. The Buck Regulator Control has two feedback paths.
Page 440: Power Up
Power Up See function block M of A6 Power Supply Schematic Diagram in the Component-Level Information binder. 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 +4.99 Vdc.
Page 441 12-18 Display/Power Supply Section...
Page 444 (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. Table A-l lists board assembly part numbers and corresponding component-level information packet (CLIP) part numbers.
Page 445: A-L. Hp 8560A Spectrum Analyzer Documented Assemblies
Table A-l. HP 8560A Spectrum Analyzer Documented Assemblies Board Assembly Instrument Assembly CLIP Part Number* Serial Prefix Part Number 41Al Keyboard 2913A through 3147A 08562-60031 08562-90110 08562-90188* 3204A and above 08562-60140 A2 Controller Assembly 2913A through 2925A 08560-60013 08563-90010 2948A through 2949A...
Page 446 Table A-l. HP 8580A Spectrum Analyzer Documented Assemblies (continued) Board Assembly Instrument Assembly CLIP Part Number’ Serial Prefix Part Number 3133A through 3217A Al4 Frequency Control (Opt. 005) 08560-60058 08560-90073 3218A and above 08560-60065t 08560-90080* Al5 RF Board 3029A through 3115A...
Page 447 Table A-2. A4 and A18 Assemblies Shipped with HP 8560As Serial Prefixed below 3207A Board Assembly Instrument Assembly CLIP Part Number Serial Prefix Part Number A4 Log Amplifier 2913A through 2948A 08560-60010 08560-90022 2929A 08560-60033 08560-90023 2950A through 3204A 08560-60035...
Page 448: A-3. Al5 Rf Assemblies Shipped With Hp 8560As Serial Prefixed Below 3029A
Table A-3. Al5 RF Assemblies Shipped with HP 8560As Serial Prefixed below 3029A RF Board Option Assembly Instrument CLIP Part Number Serial Prefix Part Number Al5 RF Board, Standard 2913A through 3009A 08562-60103 08562-90104 08562-60122 08562-90107 3017A through 3027A 2913A through 3009A...
Page 449 Component-Level Information Packets...

HP 8560A Service Manual

Table of Contents

Adjustment Procedures

Assembly Replacement

Major Assembly and Cable Locations

General Troubleshooting

Assemblies

Table of Contents

Quick Links

Chapters

Troubleshooting

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Summary of Contents for HP 8560A