Philips PM32671 Service Manual
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Philips PM32671 Service Manual

Philips PM32671 Service Manual

100 mhz dual-channel oscilloscope
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Oscilloscope
PM 32671 PM 3267U
I-It7
9499 445 021 11
84031 6/04
Scientific &
Industrial Equipment

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Summary of Contents for Philips PM32671

  • Page 1 Oscilloscope PM 32671 PM 3267U I-It7 9499 445 021 11 84031 6/04 Scientific & Industrial Equipment...

  • Page 3: Table Of Contents

    CONTENTS Page CHARACTERISTICS ..........1 .
  • Page 4 6- 1 CORRECTIVE MAINTENANCE ..........6.1.
  • Page 5 LIST OF FIGURES ..........1.1.
  • Page 6 ......Fig. 8.1. Pre-amplifier and trigger unit (unit ........8.2.

  • Page 7: Characteristics

    CHARACTERISTICS This instrument has been designed and tested in accordance with I EC Publication 348 for Class I I instruments" and UL1244"" and has been supplied in a safe condition. The present Service Manual contains information and warnings that shall be followed by the purchaser t o ensure safe operation and to retain the instrument in a safe condition.

  • Page 9: Trigger View

    TRIGGER VIEW 1.3. Trigger view Display of internal or external main time-base trigger signal. Frequency response internal: DC external: DC Both in DC trigger coupling. Rise-time internal : external : Both in DC trigger coupling. internal: 10% p.p. pushbutton MTB of S22 depressed. Pulse aberrations external: 6% (<...
  • Page 10 Additional error in MAGN mode 2%. Excluded are the first and last 50ns of which additional error is 5%. Measured over centre 8 div of screen. Expansion balance 1 div 0-jump between expanded and unexpanded sweep should not deviate from centre graticule more than the specified value.

  • Page 11: Triggering

    20 div Dynamic range + o r 5 div from screen centre Position range Linearity error Compression Phase shift between X and Y deflection 0.5 divlh. Measured a t 2mVldiv. Horizontal drift 0.025 divIK. Measured a t 2mVldiv. Horizontal temp. coefficient div (k 10%) line frequency.

  • Page 12: Additional Characteristics

    1.6. ADDITIONAL CHARACTERISTICS Calibration voltage generator output Error limit 2kHz approx. Frequency Additional input DC coupled External 2-modulation TTL compatible "1" is normal intensity "0" blanks display 1 Ons Min. required pulse width Power supply 132V AC ranges 270V Power consumption AC frequency DC range DC current...

  • Page 13: Rise-Time Measurement

    M A T Fig. 1.1. Rise-time measurement (90%) - t l (10%) (general formula) Rise-time of oscilloscope 0.35 bandwidth (Hz) of the instrument NOTE: Bear in mind that inaccuracies of CRT and time-base and rise-time of generator (measured with an input pulse with a rise-time lns) influence this measurement.

  • Page 14: Mechanical Data

    1.8. MECHANICAL DATA Dimensions: Depth Handle and controls excluded Width Handle excluded Height Feet excluded Mass 10.6 kg. (23,3 Ib) M A 9813 Fig. 1.2. Dimensions of instrument...

  • Page 15: Environmental Characteristics

    NOTE: The characteristics are valid only if the instrument is checked in accordance with the official checking procedure. Derails on these procedures and failure criteria are supplied on request by the PHILIPS-organisation in your country, or by N. V. PHILIPS’ GLOEILAMPENFABRIEKEN, TEST AND MEASURING DEPARTMENT, EINDHOVEN, THE NETHERLANDS.
  • Page 16 EXT-LINE TRIGGER INPUT RIGGER SELECTION NIT L TV CIRCUIT "2'6 "2'7 r---- TRIGGER AMPLIFIER TRIGGER SELECTION LOGIC TRIGGER COUPLING AMPLIFIER VOLTAGE CIRCUIT INPUT STAGE CONVERTOR "PI, 2 1. Fig. Bockdiagram...
  • Page 17 POWER SUPPLY UNIT LINE UNIT F I N A L Y AMPLIFIER UNIT FINAL VERTICAL COMPENSATION AMPLIFIER CIRCUIT SEPARATION CIRCUIT AMPLIFIER GENERATOR GENERATOR SELECTION LOGIC HORIZONTAL CIRCUIT CHANNEL SWITCH PROTECTION CIRCUIT MAINS VOLTAGE RECTIFIER CONVERTOR CONVERTOR STABILIZED TIME-BASE UNIl SUPPLY VOLTAGES FUSE LINE TRIGGER PICK-OFF...

  • Page 18: Block Diagram Description

    RCU IT DESC R PT ION 2.1. BLOCK DIAGRAM DESCRIPTION (see Fig. 2 . 1 . ) 2 . 1 . I . Vertical Deflection TRIGGER UNIT 3, DELAY LINE The vertical deflection system is located on the PRE-AMPLIFIER U N I T 8 AND FINAL AMPLIFIER UNlT9. The instrument has two identical vertical channels, A and B: only channel A i s described.
  • Page 19 The trigger signals derived from the AMPLIFIER circuits of channel A and B, and from the DELAY LINE DRIVER are routed t o the TRIGGER INPUT STAGE. These signals are in current form, which makes them less sensitive to interference; often a problem with long signal wires. I n the TRIGGER INPUT STAGE, these current signals are converted into voltage form, and fed t o the TRIGGER SELECTION CIRCUIT.
  • Page 20 The MAIN TIME-BASE GENERATOR produces a sawtooth voltage, the repetition time being controlled by the TIME/DIV switch. To enable the capacitors that determine the repetition rate sufficient time t o discharge, the HOLD-OFF CIRCUIT is employed. This time is adjustable with the HOLD-OFF control. After the HOLD-OFF time, the HOLD-OFF CIRCUIT sends a signal to the SWEEP-GATING LOGIC, which in turn starts the next time-base sweep.
  • Page 21 The selected signal i s routed to the FINAL HORIZONTAL AMPLIFIER via the HORIZONTAL PRE- AMPLIFIER. This pre-amplifier comprises the X POS potentiometer for horizontal shift of the trace, and i t s associated circuit. It also includes the X MAGNIFIER for x10 magnification of the horizontal deflection. If the X MAGN push-pull switch, incorporated in the X POS control, is pulled for x10 magnification the MAGN LED lights-up.

  • Page 22: Circuit Description Of The Vertical Section

    THE CONVERTER DRIVER stage drives the CONVERTER transformer. The rectified +14V output-voltage is fed back as control via the REGULATOR PROTECTION circuit. In this way, the voltages on the secondary windings of the CONVERTER transformer are stabilised. After rec- tification and smoothing, the stabilised supply voltages are fed to the various electronic circuits in the instru- ment.

  • Page 23: Impedance Converter

    Impedance converter (see Fig, 2.2. and 8.3.) The input signal is fed via FET V501 (in source-follower cor?figuration), transistors V503, V504 and V508 to the low-impedance attenuator. The special type FET V501, with very fast rise-time response, reduces the source impedance which prevents bandwidth loss.

  • Page 24: Continuous Control Circuit

    Continuous Control Circuit (see Fig. 2.3. and 8.3.) The output signal of the lowimpedance attenuator is fed to the integrated circuit D504 (3.6) via the con- tinuous circuit comprising FET D503 (13, 14, 16). This FET is located between the signal path, pin 6 of D504 and earth, via resistor R584. This resistor compen- sates the output impedance of the low-impedance attenuator ( 5 0 a and the impedance of the selected FET switch ( 3 0 a...

  • Page 25: Vertical Channel Selection Logic

    2-10 Amplifier 2.2.3. The channel A trigger signals for both time-bases are picked-off from pins 14 and 15 of integrated circuit D504 The circuit of D504 (known as a Cherry-stage) converts the voltage input signal into a current output signal (pins 12 and 13).
  • Page 26 2-1 I The vertical channel switches D831 and D631 are controlled by the vertical channel selection logic (D632, ADD, B. These switches control the vertical logic via connectors X204 (on SWITCH UNIT A102) and X501. Positive logic is used in the digital circuits; i.e. '1' is +5 V (H) and logic i s 0 V (L).
  • Page 27 2-1 2 The display sequence is as follows: Channel A TRIG VIEW Channel B depressed Vertical channels A, B and TRIG VIEW are displayed, and in this mode the chopper oscillator is switched off, so D633-10 is a t level H. The alternate pulses are applied to the clock inputs of flip-flop D634, which control the switching between the three vertical channels.
  • Page 28 2-13 2.2.6. Delay-line driver The delay-line driver consists of the Hooper stage V633lV634 and Cherry stage V636lV637. The Hooper stage has an additional compensation circuit with operational amplifier D636. One input of D636 measures the divider R692lR693. In the event of voltage differences between both inputs, the output of D636 compensates for this via R662lR663 to the bases of V663 and V664.
  • Page 29 2-13 2.2.6. Delay-line driver The delay-line driver consists of the Hooper stage V633lV634 and Cherry stage V636lV637. The Hooper stage has an additional compensation circuit with operational amplifier D636. One input of D636 measures the divider R692lR693. In the event of voltage differences between both inputs, the output of D636 compensates for this via R662lR663 to the bases of V663 and V664.

  • Page 30: Circuit Description Of The Horizontal Section

    2-14 2.3. CIRCUIT DESCRIPTION THE HORIZONTAL SECTION 8.5.) 2.3.1. Main Time-base Triggering (see Fig. Trigger selection circuit and trigger input stage (A, B, COMP) The trigger signal from the vertical channel A applied to shunt feedback amplifier V912, V913, as a symmetrical current signal.
  • Page 31 2-1 5 d ) Trigger coupling In the DC mode, relay contact K851 is closed and the signal is passed unattenuated via R868. In the LF mode, K851 is open and switch contact S20C is closed. The signal is now passed via the series low- pass filter R872, C858, R869.
  • Page 32 2-16 TV circuit With the TV CIRCUIT is possible to trigger the MTB on television line signals (TIME/DIV 20 ps In the TV mode, the FINAL TRIGGER AMPLIFIER i s inoperative and instead, the TV CIRCUIT triggers the MTB. The LEVEL control R6 is also inoperative and the slope switch S8 permits selection between positive and negative video signals.
  • Page 33 2-1 7 This stage produces positive and negative output d.c. voltages that are proportional to the positive and negative top of the trigger signal. In the AUTO mode, these voltages are applied t o the two ends of the LEVEL control R6. The input signal for the TOP DETECTOR i s derived from shunt feedback stage V863. The positive top of this signal is rectified by diode V867 and smoothed by C872.
  • Page 34 2-18 2.3.3. Main Time-base (see Fig. 8.9) For a fuller understanding of the functioning of the main time-base, important voltage waveforms in t h e MTB control logic are given in Fig. 2.5. a) Auto mode without triggering (free-running time-base) Consider the situation a t the moment the main time-base starts.
  • Page 35 2-19 Schmitt output D214-11 and NAND gate input D211-3 are a t level H when the hold-off capacitors are dis- charged. The H level on output pin 6 of flip-flop D212 is routed via 021 1 (3,4,5,6) and D209 (2,3,1) t o V O L T A G E W A V E F O R M S S W E E P GATING...
  • Page 36 2-20 I n the triggered mode, the signal path that starts the MTB directly after the hold-off period (in auto free-run mode) is interrupted by an H level on NAND gate D209-2. This interrupted signal path is via D211 (3,4,5,6) and D209 (2,3,1).
  • Page 37 2-2 1 The NOT TRIG'D indicator normally glows when awaiting single-shot trigger. i) HORIZONTAL CHANNEL SELECTION LOGIC& HORIZONTAL CHANNEL SWITCH MTB only (S2D depressed or all horizontal display mode switches S2 released) In this mode, S2D feeds a logic L to the input (10) of flip-flop D207.
  • Page 38 2-22 Z-LOGIC This stage sends a current signal t o the Z amplifier to control the intensity of the spot on the c.r.t. screen. The spot intensity depends on the mode selected; e.g. MTB, MTB intensified by DTB, DTB, A L T TB, EXT X DEFL, and also on the position of the INTENS control R12.
  • Page 39 2-23 MTB intensified When this mode is selected, the input of the F I N A L HORIZONTAL AMPLIFIER i s derived from the MTB output and the DTB TIME/DIV switch does not occupy the OFF position. Input D217-2 i s H during the MTB sweep, which means that D217-3 and input D218-13 are also H during the sweep period.
  • Page 40 2-24 Inputs D218-9/10 are H if X DEFL is selected or if the DTB TIME/DIV switch in OFF (V285 non- conductive). Input D218-11 is H if ALT TB is selected or if t h e final X amplifier is fed from the DTB signal. As a result, output D218-8 is L (i.e.
  • Page 41 2-25 Delayed Time-base (see Fig. 8.1 1 ) The DELAYED TIME-BASE GENERATOR itself generates a time-linear sawtooth in the same way as described for the main time-base. Transistor V229 is the constant-current source, with its base fed from a fixed d.c. voltage that is derived via the continuous TIME/DIV control R9.

  • Page 42: Important Voltage Waveforms In The Dtb Control Logic

    2-26 i s applied via the Darlington pair V219, V209, the voltage divider R239, R238 and emitter-follower V221 t o the input of the Schmitt trigger D203 (1,2,3), which i s the end-of-sweep detector. I f this voltage has reached a value o f +I Output D203-3 now becomes L and is inverted t o give H on output D203-8, which i s applied to pin 6 of SR flip-flop D204 (1 6).
  • Page 43 2-27 The other half of the final amplifier consists of V1303 (PNP, t o adapt d.c. level) V1307 (NPN, shunt- feedback amplifier), V1317 (NPN, t o adapt d.c. level), V1316 (PNP, current source) and V1314 (PNP output emitter-follower). The signal conditions are as follows: I f the sawtooth voltage on the base of V1371) rises, the collector current of V1372 also rises.

  • Page 44: The Power Supply

    2-28 2.5. THE POWER SUPPLY The stabilised power supply for the oscilloscope consists of the following: an input circuit a converter driver a flyback converter a regulator and protection circuit secondary output rectifiers 2.5.1. Input circuit The instrument can be set t o operate from the following mains supply voltages: 110 V, 220 V and 240 Va.c., these nominal voltages being selected by the mains voltage selector S25 a t the rear of the instrument.

  • Page 45: Fig . 2.9. Converter-Driver

    2-29 2.5.2. Converter Driver and Flyback Converter The converter driver consists of transistors V1438, V1413 and transformer T1404. The converter itself consists of the converter transformer T1402. 2 . 9 8.14) - The converter driver (see Fig. The circuit functions as follows: The pulse-width of the square-wave current I 1 that i s applied t o the base of transistor V1438 is determined by the integrated circuit D1402.
  • Page 46 2-30 The flyback converter (see Fig. 2.10) The flyback converter functions as follows: If transistor V1413 conducts under the control of base current 13, the collector current increases t o 4 A. During the period T I , the voltage level on the collector of V1413 i s e a t earth potential. A t the moment when V1413 i s blocked i t s collector current i s switched o f f (see point B of Fig.

  • Page 47: Fig . 2.1 0 . Fly-Back Converter

    2-3 1 The Regulator and Protection Circuit (see Fig. 8.15) 2 . 5 . 3 . The regulator circuit D1402, via transistors V1433 and V1428, controls the pulse-width of t h e square-wave current applied t o the base of V 1438. A t the moment of switch-on, the supply voltage for D1402 is delivered via the emitter-follower V1429 to pin 1 of 01402.
  • Page 48 Output current sensing The voltage level derived from potentiometer R1476 i s applied t o D1402-11 for current sensing. This+oltage level is taken from the current transformer T1403, This transformer has no power losses so i t s dissipation is low. I f the voltage level on D1402-11 exceeds 0,48 V, the output pulses from pins 14 and 15 are cut-off.
  • Page 49 2-33 8.15) 2.5.6. Line Trigger Pick-off (see Fig. The line trigger signal is derived from the secondary winding of the mains transformer via t h e connector The mains voltage sine-wave signal i s applied t o the transistor V1406 via resistors R1422 and R1423. The square-wave signal the collector o f V1406 is routed t o a filter consisting of R1419, R1416, R1414 and This filter re-converts the square-wave voltage t o a sine-wave voltage a t the mains frequency.
  • Page 50 2-34 Basic Digital Circuits (see Fig. 2.13) 2 . 6 . 2 . The type of logic used is T T L and the supply voltage The logic levels used are defined as follows: (H) constitutes an input between 2...5 V and an output between 2.4 5 V .

  • Page 51: Fig . 2.12. Basic Analog Circuits

    2-35 AND-GATE NAND-GATE SERIES FEEDBACK AMPLIFIER SHUNT FEEDBACK AMPLIFIER I N = O U T OR-GATE N 0 R-GATE S E T INPUT OUTPUT J- INPUT CLOCK INVERTED OUTPUT R E S E T I N P U T JK-FLIPFLOP M A T 916 MAT 917 LONG...
  • Page 52 D ISMANT I MG THE INSTRUMENT 3.1. GENERAL INFORMATION WARNING: The opening of covers or removal of parts, except those of which access can be gained by hand, is likely to expose live parts, and also accessible terminals may be live. The instrument shall be disconnected from all voltage sources before any adjustment, replace- ment or maintenance and repair during which the instrument will be opened.
  • Page 53 PERFORMANCE CHECK 4.1. GENERAL INFORMATION WARNING: Before switching on, ensure that the oscilloscope has been installed in accordance with the instructions outlined in chapter 2 of the operating manual, Installation instructions. This procedure is intended t o be used for incoming inspection t o determine the acceptability of newly pur- chased or recently recalibrated instruments.

  • Page 54: Preliminary Settings

    Duty cycle 50% Time-marker generator Repetition rate: 0.5s Tekstronix TG501 TV pattern generator Philips PM5519 Must have video output Variable mains transformer Philips ord. number Well insulated output voltage 242252900005 Philips PE1540 DC power supply Adjustable output: Current: 1,8A Moving-iron meter...
  • Page 55 PUT ABOUT IN MID POSITION AND DEPRESS: R l / S 4 , R 2 1 S 5 . R 4 / 5 6 , R 5 / 5 7 , PM 3267 AUTO VIEW CHOP ......
  • Page 56 Te kstroni x TG50 1 Time-marker generator Repetition rate: 0.5s Philips PM5519 TV pattern generator Must have video output Variable mains transformer Well insulated output voltage Philips ord. number 242252900005 Adjustable output: Philips PE1540 DC power supply Current: 1,8A Moving-iron meter Dummy probe 2 1 M a 0.1 % //25pF...
  • Page 57 4.4. CHECKING PROCEDURE SETT I N GS STEP BJ ECTl V E INPUT VOLTAGE MEASURING RESULTS 4.1. Power Start power supply Mains voltage - Switch power on s2 1 - Start a t selected mains voltage Pilot lamp B5 lights up. Power consumption 45W from ac 4.1 .
  • Page 58 EASURING RESULTS INPUT VOLTAGE S ETT I NGS STEP OBJECTIVE Square-wave signal 10kHz 4.3.3. Vertical deflect ion coefficients to A input (B) Trace height 5 DIV., or -3% 0.15 div. AMPL Trace height 4 DIV., or -3% (+ 0.12 div. Trace height 5 DIV., or -3% 0.15 div.
  • Page 59 STEP OBJECTIVE INPUT VOLTAGE SETTINGS Trace height 5 div., or -3% (+ 0.15 div.) Trace height 2.5 div., or -3% - Depress 0 of S17 (S18) 4.3.6. Input coupling Sine-wave signal 2kHz - Set the trace in the centre of the offset to A input (B) screen R1 f t ( R 2 f t ) - Depress AC of S17 ( 9 8 )
  • Page 60 M EASU R I NG RESULTS R EQU I R EM ENTS INPUT VOLTAGE SETTINGS STEP VOLTAGE Square-wave signal 1 MHz, AMPLIDIV to 2mV 4.3.1 0. Position controls R1 rise-time 1 ns, ampl. 12mV to A input (B) AMPLIDIV t o 0.1V Square-wave signal 1 MHz, rise-time 1 ns, ampl.
  • Page 61 MEASURING RESULTS STEP OBJECTIVE INPUT VOLTAGE Depress 0 of S17 6 1 8 ) 4.3.1 2. Trace jump Set trace in the centre of the screen a) attenuator Switch AMPLIDIV switch Trace jump 0.2 div. between 1OV 20 div Switch AMPLIDIV switch Trace jump 0.4 div.
  • Page 62 MEASU R ING RESULTS STEP 0 BJ INPUT VOLTAGE SETTINGS R EQU I R EM ENTS 4 . 4 . Trigger view Square-wave signal VIEW S1. 4.4.1. Sensitivity A (B) - Depress TRIG to A input - AMPL/DIV switch AMPL. Trace height 5 div.
  • Page 63 STEP OBJECTIVE INPUT VOLTAGE SETTINGS MEASURING RESULTS Sine-wave signal 1 kHz to 4.4.2. Sensitivity EXT Depress EXT of S23 Trace height 6 div. 0.18 div.) Depress TRIG VIEW EXT input X5 Ampl. 1.2V 4.4.3. Pulse aberrations Square-wave signal 1 MHz, AMPLIDIV to 20mV Trace height 6 div.
  • Page 64 EQU I R EM E NTS MEASURING RESULTS STEP 0 BJ ECTl V E INPUT VOLTAGE 4.5. Horizontal or X-axis Square-wave signal 2kHz, 4.5.1. Display modes ampl. 120mV to input A - Square-wave signal 2.4 div. high Depress MTB of S2 MTB (trace) lntensified part DTB visible - lntensified part (DTB) visible over the...
  • Page 65 STEP OBJECTIVE INPUT VOLTAGE SETTINGS R EQU I R EM ENTS TV signal from TV pattern Depress TV of Check for stable triggering on TV frame generator to input A (B) Adjust A (B) AMPL/DIV to pulses a t MTB TIME/DIV settings 0.5s/div. div.
  • Page 66 R EQU I R EM ENTS MEASURING RESULTS INPUT VOLTAGE SETTINGS J ECTl V E Trigger point adjustable over the Depress EXT of S23 Sine-wave signal 1 kHz, complete amplitude (k 1.6V) LEVEL R6 Trace must be triggered Sine-wave signal 25kHz, - Depress DC of S20 Trigger bandwith ampl.
  • Page 67 MEASURING RESULTS OBJECTIVE INPUT VOLTAGE Measured over div. in horizontal 1.7. Main time-base screen centre: Time-marker signal, MTB TIME/DIV S15 to 1.7.1. Time coefficients repetition time: 0.05 0.05 Coefficient error Coefficient error Coefficient error Coefficient error Coefficient error Coefficient error Coefficient error Coefficient error Coefficient error...
  • Page 68 OBJECTIVE INPUT VOLTAGE MEASURING RESULT! Single shot Square-wave signal 10kHz Trace once visible to input A Depress SINGLE of During SINGLE shot action NOT TRIG’D led B1 lights up Hold off Square-wave signal repeti- - TIME/DIV to 2@ Sweep HOLD OFF time can be varied tion time lops to input A HOLD OFF R 1 1 0 by a factor of I 0...
  • Page 69 I E ASU R I NG R ESU LTS R EQU I R EM ENTS INPUT VOLTAGE SETTINGS OBJECTIVE Signal triggers a t trace height of 0.5 div. Sine-wave signal freq. Trigger sensitivity to input A Depress A of S22 - Depress DTB of S22 - Adjust LEVEL R 4 0 Adjust generator to 0.5 div.
  • Page 70 SETTINGS R EQU I R EM ENTS MEASURING RESU LTS INPUT VOLTAGE Time-marker signal Depress DTB of repetition time: Measured over 8 div. in horizontal screen centre: Coefficient error 0.05 Coefficient error 0.2 ps 0.5 ps Coefficient error Coefficient error Coefficient error Coefficient error Coefficient error...
  • Page 71 0 B J ECTlV E SETTINGS INPUT VOLTAGE Intensified part (DTB) starts a t the 1.9.4. Delay time As 4.9.2. same point as the MTB trace (2nd to 0.05p Delay time to 1.0 vertical line) Set start of MTB-trace on the first vertical graticule line - DELAY TIME R 3 to 9.0...
  • Page 72 STEP 3 BJ ECTlV E INPUT VOLTAGE SETT I N GS MEASURING RESU LTI 4.10. Sine-wave signal 10kHz Set trace height to 6 div. A line under an angle of 45' with respect 4.10.1 to input A Depress A of S23 coefficients Depress X DEFL of S2 Sine-wave signal 10kHz...
  • Page 73 STEP INPUT VOLTAGE SETTINGS MEASURING RESULT! Depress X DEFL of S2 10.3. Dynamic range to input Depress B of S1 horizontal deflection 5 div. Horizontal deflection 20 div. Sine-wave signal 2kHz, - Depress X DEFL of A line under an angle of 45Owith respect and Y ampl.
  • Page 74 5- 1 CHECKING AND ADJUSTING WARNING: The opening of covers or removal of parts, except those t o which access can be gained by hand, likely to expose live parts, and also accessible terminals may be live. The instrument shall be disconnected from voltage sources before any adjustment, replacement or maintenance and repair during which the instrument will be opened.

  • Page 75: Adjustment Points Top View

    MAINS TRANS FORMER PRE AMPLIFIER E TRIGGER UNIT START MULTIPLIER R371 TRIG GAIN TRIG VIEW GAIN EXT TIME BASE-UNI RATIO 821022 Fig. 5.2. Adjustmen i Fig. 5.1. Adjustment points top view...

  • Page 76: Adjustment Points Right Side

    1205 GAIN R 6 6 0 A 20mV FINAL Y AMPLIFIER CONT A UNIT R 8 0 4 N / I R604 N / I CONTB R 822 GAIN GAIN R571 LIMIT C744 R779 C 7 4 6 SUPPLY VOLTAGE C R T SUPPLY VOLTAGE s a w...
  • Page 77 5.4. SURVEY OF ADJUSTING ELEMENTS AND AUXILIARY EQUIPMENT CHAPTER FIGURES RECOMMENDED INSTRUMENT ADJUSTING RESULT ADJUSTMENT AND INPUT SIGNALS ILEMENT POWER SUPPLY 5.5.1 .I. Digital multimeter 31474 Supply voltage adjustment 5.5.1.2. 5.3. 1476 Extra load between pin 2 (+14V) and Current sensing pin 1 of X858.
  • Page 78 ADJUSTMENT ADJUSTING ADJUSTING RESULT RECOMMENDED INSTRUMENT CHAPTER FIGURES ELEMENT AND INPUT SIGNALS LF CORRECTIONS AND SENSITIVITIES Continuous control of R622 Continuous attenuation starts a t 15' Function generator 5.5.4. 5.2. channel A (B) from counter clockwise-stop of R7 (R8j (square-wave signal 1 OkHz) R617 Trace height from 5 div.
  • Page 79 ADJUSTMENT ADJUSTING ADJUSTING RESULT RECOMMENDED INSTRUMENT CHAPTER FIGURES AND INPUT SIGNALS ELEMENT Pulse top errors Square-wave generator. 5.2. Input capacitance channel A (B) Trace rise-time height 2 : 1 (fig. 5.5.) Freq. 10kHz 6 div. 6 div. 6 div. 6 div. Adjust C of dummy 6 div.
  • Page 80 RECOMMENDED INSTRUMENT CHAPTER ADJUSTING RESULT ADJUSTMENT ADJUSTING AND INPUT SIGNALS ELEMENT Square-wave response C895 ((2896) Square-wave function generator, 5.5.5.6. 5.2. trigger view via channel frequency 1 MHz/rise-time Ins, 6 div. deflection. Square-wave response Square-wave function generator, 5.5.5.6. 5.3. trigger view via external frequency IOkHz, amplitude 2V.
  • Page 81 ADJUSTMENT ADJUSTING ADJUSTING RESULT RECOMMENDED INSTRUMENT CHAPTER FIGURES ELEMENT AND INPUT SIGNALS TIM E-BASE GENE R A T 0 RS Main-time-base time Check that the centre 8 cycles have a Time-marker generator, pulse 5.5.7.1. coefficients total width of 8 div. repetition rate: MTB TIME/DIV 0.05...
  • Page 82 CHAPTER FIGURES ADJUSTING RESULT ADJUSTMENT ELEMENT 5 -5.7.4. 'ime-marker generator, pulse Check that the centre cycles have a tota width of 8 div. MTB TIME/DIV. DTB TIME/DIV. 0.05 ps 0.05 p s 0.1 p 5.1. R349 0.1 ms 5.1. 0.1 ms 0.2 ms R 35 0.2 ms...
  • Page 83 5-12 5.5. ADJUSTING PROCEDURE The adjusting elements are indicated in fig. 5.1 5.2. and 5.3. for respectively top, bottom and right-hand side of the instrument. 5.5.1. Power supply Check that the voltage selector (S25) has been set to the local mains voltage. - Connect the instrument to the mains voltage or to a 24V battery supply.

  • Page 84: Geometry Check

    5-13 5.5.2.4. Focus and astigmatism - Set the AMPL/DIV switch - Depress 0 of S18. - Set the MTB TIME/DIV switch S15 to 20p. Depress ALT of S1. - Set the trace of channel B in the vertical centre of the screen by means of the POSITION control R2. - Set the FOCUS control R13 135' from i t s l e f t hand stop.
  • Page 85 5-1 4 5.5.3.3. Final Y amplifier balance - Interconnect both inputs of the delay line. - Adjust R1213 (fig. 5.2.) on the final Y amplifier unit so that the trace is just in the vertical mid of the screen. Disconnect both inputs of the delay-line. 0 of S17 and S18.
  • Page 86 5-15 5.5.4.4. Gain X I 0 (sensitivity) channel A Depress A (B) of S1. Depress A (B) of S23. Set the AMPL/DIV switch S9 (S11) to 2mV. Apply a square-wave signal, freq. IOkHz, ampl. 10mV to input A (B). Check that the trace height is 5 div. 3%;...
  • Page 87 5-16 5.5.5.2. Input capacitance, channel A (B) Apply via dummy probe (fig. 5.5.) a square-wave signal, freq. IOkHz, rise-time - Check the square-wave response; check that the pulse top errors do not exceed or - 1 % ; if necessary Trace height Adjusting element Channel A...
  • Page 88 5-1 7 - Set the TIME/DIV switch S15 t o 0 . 1 ~ . - Using C1206, R1217 and C544 (fig. 5.2.) adjust the square-wave response as straight as possible (fig. 5.6.). - Set the AMPL/DIV switch S9 to 50mV. - Apply to X2 (A) a square-wave signal of 300mV, frequency 1 MHz and with a rise-time 1 ns.
  • Page 89 5-1 8 5.5.5.7. Chopper cross-talk from channel A to B - Set the controls as indicated in fig. 4.1. Depress CHOP pushbutton of S1. Set the AMPL/DIV switches S9 and S11 to 20mV. Apply to X2 (A) a square-wave signal of 120mV, frequency 10kHz and with a rise-time 1 ns.
  • Page 90 5-1 9 5.5.6. Triggering 5.5.6.1. Trigger symmetry controls indicated in fig. 4.1. Set S15 to 50p. - Set to 2 V . - Apply a sine-wave signal 1.6V p-p frequency 10kHz to input A. Adjust the generator to trace height of 8 div. - Push the SLOPE switch S8 for positive triggering.
  • Page 91 5-20 5.5.6.5. Trigger view balance - Depress T R I G VIEW o f S1. Depress 0 of S17. - Depress A U T O PP of - Depress DC o f - Depress A o f is in the vertical centre of the screen; if necessary readjust R841 (see fig. 5.2.). - Check t h a t the trace 5.5.6.6.
  • Page 92 5.5.7. Time-base generators NOTE: Before starting the adjustment of the time-base generators and the delay time multiplier add a 1 . 8 M a resistor ford. nr. 4822 63 194) across R371 on the time-base (unit 2). This compensates for sweep time inaccuracies at high ambient temperatures.
  • Page 93 5-22 5.5.7.4. Delayed time-base time coefficients Set the controls as indicated in fig. 4.1. - Depress A of Set the DELAY TIME control R3 to 0. Set the MTB TIME/DIV switch S15 to 2 p . Set the DTB TIME/DIV switch S13 to time-marker signal, pulse repetition rate Ip, to input X2 (A).
  • Page 94 5-23 5.5.9. Calibration voltage - Check if the output voltage on CAL output socket X I has a frequency of 2kHz 10%) and a duty cycle between 45 and 55%. 0.7%. Check the output voltage on X I with a well calibrated oscilloscope. Amplitude must be 1.2 Volt If incorrect readjust R1549 on unit 5.

  • Page 95: Corrective Maintenance

    6.2. REPLACEMENTS Standard parts Electrical and mechanical part replacements can be obtained through your local Philips organisation or representative. However, many of the standard electronic components can be obtained from other local suppliers. Before purchasing or ordering replacement parts, check the parts l i s t for value tolerance, rating and description.
  • Page 96 6 . 2 . 3 . 2 . Static sensitive components (V501 and V701) This instrument contains electrical components (MOS devices) that are susceptible t o damage from static discharge. Servicing static-sensitive assemblies or components should be performed only a t a static-free work station by qualified service personnel.

  • Page 97: Replacing Knobs

    6.1.) 6.2.4. Replacing knobs (see fig. Single knobs and delay time multiplier knob Prise off cap A. - Slecken screw (or nut) B. - Pull the knob from the spindle. Double knobs - Prise off cap A and slacken screw B. - Pull the inner knob from the spindle.

  • Page 98: Fig 6.2A

    6.2.6. Replacing the cathode ray tube (CRT) WARNING: Handle the CRT carefully. Rough handling or scratching can cause the CRT to implode. In particular be very careful with the side connections of the CRT. If these pins are bent the CRT is likely to develop a loss of vacuum.

  • Page 99: Removing The Printed Circuit Boards

    6.2.7. Removing the printed circuit boards - Remove 2 screws in the unit. Remove screw that secures the unit to the right chassis plate. Unplug 1 multipole connector. - Unplug 2 coaxial connectors. - Unplug one single pole connector. - Slide the unit out of the front panel. - Remove the trigger source unit as indicated in chapter 6.2.7.1.

  • Page 100: Fig . 6.1

    and right-hand chassis to a cable that comes ear panel. C R T remains in position v be taken off. Fig. 6.3. Removal time-base unit lent. This screw i s as possible. s from the EHT multi- remove the can be disconnected -circuit) the isolation is interrupted.
  • Page 101 and right-hand chassis to a cable that comes ear panel. C R T remains in position v be taken off. Fig. 6.3. Removal time-base unit lent. This screw i s as possible. s from the EHT multi- remove the can be disconnected -circuit) the isolation is interrupted.

  • Page 102: Time-Base Unit Removed

    6.2.7. Removing the Removing the Remove2 Remove Unplug - Unplug2c - Unplug oni - Slide the u 6 . 2 . 7 . 2 . Removal of pi - Removeth - Unplug the - Unplug3c - Unplug in the right - Slacken thi screws it is - Removeth...
  • Page 103 6-1 0 6.2.7.4. Removal of switch unit and potentiometer unit Remove the time base unit as indicated in chapter 6.2.7.3. Remove the trigger source unit as indicated in chapter 6.2.7.1. Remove the pre-amplifier and trigger unit as indicated in chapter 6.2.7.2. Remove one multipole connector from the final X/Z amplifier unit.
  • Page 104 6.2.7.7. Removal o f final X/Z amplifier unit - Unplug multipole connectors. - Unplug 1 coaxial cable. - Unplug single-wire connectors from the time-base. Remove very carefully the side connections of the CRT WARNING: Handle the CRT carefully. Rough handling or scratching can cause the CRT to implode. In particular be very careful with the side connections of the CRT.

  • Page 105: Soldering Techniques

    6-1 2 Soldering techniques solder and a Ordinary Watt pencil type soldering iron can be used for the majority of the soldering. I f a higher wattage-rating soldering iron is used on the etched circuit boards, excessive heat can cause the etched circuit wiring t o separate from the base material.

  • Page 106: Checks After Repair And Maintenance

    6-13 - Capacitors. Leakage can be traced with an ohmmeter adjusted to the highest resistance range. When testing take care of polarity and maximum allowed voltage. An open capacitor can be checked if the response for AC signals is observed. Also a capacitance meter can be used: compare the measured value with value and tolerance indicated in the parts list.

  • Page 107: Accessory Information

    6-15 6.7. ACCESSORY INFORMATION 6.7.1. Adjustments Matching the probe to your oscilloscope The measuring probe has been adjusted and checked by the manufacturer. However, to match the probe to your oscilloscope, the following manipulation is necessary. Connect the measuring pin to the CAL socket of the oscilloscope. A trimmer C2 (Fig.
  • Page 108 6-16 6 . 7 . 2 . Dismantling 6.13) Dismantling the probe (see Fig. The front part 11 of the probe can be screwed from the rear part 13. Item 11 can then be slid from 12 and 13. The RC combination 12 is soldered t o 13. For replacement of 12 refer t o the next section. Dismantling the compensation box (see Fig.
  • Page 109 6.7.4. Parts List Mechanical parts (see Fig. 6.13 6.14.) Items 1 to 10 are standard accessories supplied with the probe. item Ordering number Description 5322 321 20223 Earth cable 5322 256 94136 Probe holder 532225544026 Soldering terminals which may be incorporated in circuits routine t e s t points 532253264223 Marking ring red...

  • Page 110: Parts List

    PARTS LIST Subject t o alteration without notice 7.1. PARTS INDICATED IN FIG. 7.1. 7.6. Description Ord. number Fig. 7.1. 532241430004 Ten turn knob (used for "delay time") Pushbutton brown/green (31 pcs./instrument). 532241420034 Pushbutton brown (used for "single"). 532241420033 Instrument cover (without handle and feet). 532244790372 5322 414 70016 Cover, brown with line.

  • Page 111: Mechanical Parts. Rear View

    M A T 1173 Fig. Mechanical parts, rear view MAT 11 7 4 Fig. 7.2. Mechanical parts, rear view...
  • Page 113 7.2. PARTS NOT INDICATED WITH ITEM-NUMBERS IN THE FIGURES Ordering nu Ordering number Description 532227660208 Pushbutton switch S1 (on time base unit) 532227670075 Pushbutton switch S2 and S3 (on time base unit) Pushbutton switch S17 S20 (on pre-ampl. +trigger unit) 532227680237 Pushbutton switch S22, S23 (on trigger unit) 5322 276 60209...

  • Page 114: Electrical Parts

    7.3. ELECTRICAL PARTS IMPORTANT: Because of problems in the computer program in sorting out the component numbers in the correct sequence, the computer parts lists are somewhat confusing. However all the components are listed. LIST OF POTENTIOMETER SWITCH COMBINATIONS Function Service ordering code Positionlpull to invert A.
  • Page 115 Resistors: 5322 1 16 5051 5 R296 R333 5322 1 16 50484 5322 1 16 54589 R334 R411 532211654653 532211654034 R517 532211654632 7,5 K a 532211654608 R607 532211654034 R717 R807 7,5 K a 532211654608 R870 1 K a 4822 116 51235 R869 532211651052 5322 1 16 50459...
  • Page 116 ORDERING CODE POSNR DESCRIPTION 18PF 4822 122 31061 5322 124 14081 4822 122 31058 CAPACITORICERAM 15 PF 4822 122 31041 CAPACITORPCERAM 4822 122 31058 15 PF 27 PF 4822 122 30045 4822 122 31215 4822 122 31056 12 PF 5322 125 50048 3,5 PF TRIMCAP 4822 122 31045 10 PF TRIMCAP...
  • Page 117 7-10 O R D E R I N G CODE POSNR D E S C R I P T I O N C 1310 1 0 0 4822 1 2 2 31426 1 0 0 4822 1 2 2 31414 C 1 3 1 1 1 0 0 4822 1 2 2 31414...
  • Page 118 7-1 1 O R D E R I N G CODE POSNR D E S C R I P T I O N C 1 5 0 6 C A P A C I T O R P C E R A M 1 0 0 4822 122 3 1 4 1 4 C 1 5 0 7...
  • Page 119 7-1 2 ORDERING CODE POSNR DESCRIPTION 4822 122 30034 CAPACITORtCERAM C 263 4822 122 31414 C 264 4822 122 31414 C 265 CAPACITORtCERAM 4822 122 31414 C 267 CAPACITORtCERAM 5322 121 40175 C 268 CAPACITOR, FOIL 4822 122 30045 27PF C 269 CAPACITORtCERAM 4822 122 31414...
  • Page 120 7-13 ORDERING CODE POSNR DESCRIPTION C 568 CAPPELECTROLYT. 33UF 40% 4822 124 20945 C 569 CAPACITORPCERAM 4822 122 31414 C 572 5322 124 14066 CAPACITORPCERAM ONF-2 4822 122 31414 CAPACITORPCERAM 4822 122 31414 C 576 CAP, ELECTROLYT. 33UF 40% 4822 124 20945 C 631 F-2 0 +5 0 4822 122 31414...
  • Page 121 7-14 POSNR DESCRIPTION ORDERING CODE 4822 124 20945 CAP, ELECTROLYT. 4822 122 31414 C 762 4822 122 31414 C 763 4822 124 20688 C 764 4822 122 31414 C 766 4822 122 31414 C 767 4822 122 31414 5322 121 40323 C 771 CAPACITOR, FOIL 4822 122 31414...
  • Page 122 7-15 POSNR DESCRIPTION ORDERING CODE C 925 CAPACITORPCERAM 4822 122 31316 C 929 CAPACITORPCERAM 4822 122 30053 C 931 4822 121 40232 4822 122 31414 C 932 CAPACITORPCERAM 4822 122 31316 CAPACITORPCERAM 4822 122 30104 CAPACITORPCERAM 33PF 4822 122 31067 4822 122 30104 C 936 4822 122 31067...
  • Page 123 7-16 POSNR DESCRIPTION ORDERING CODE 5322 280 20099 5322 280 20101 5322 280 20099 RELAY, REED 5322 280 20101 RELAY, REED 5322 280 20099 5322 280 20101 5322 280 20099 RELAY, REED 5322 280 20099 COIL COIL 1401 5322 156 44014 COIL COIL 1402...
  • Page 124 7-1 7 POSNR ORDERING CODE DESCRIPTION MR25 1013 4822 116 51268 1014 MR25 4822 116 51253 1016 39 O1K MR25 4822 116 51246 1017 MR25 5322 116 54595 1019 MR25 5322 116 54504 MR25 5322 116 54019 R 1021 MR25 5322 116 54504 1022 MR25...
  • Page 125 7-1 8 ORDERING C O D E POSNR DESCRIPTION 4 0 2 M R 2 5 5 3 2 2 116 54519 1087 6 4 9 M R 2 5 5 3 2 2 116 5 4 5 3 2 R 1 0 8 8 MR25 5 3 2 2 116 50581...
  • Page 126 7-19 CODE POSNR ORDERING DESCRIPTION 5 3 2 2 116 54613 M R 2 5 R 1 2 2 5 3 2 2 116 50635 M R 2 5 1221 116 51253 4822 1227 5 3 2 2 116 30236 R 1228 MR25 5 3 2 2 116 54511...
  • Page 127 7-20 POSNR DESCRIPTION ORDERING CODE 1332 MR25 5322 116 55361 1333 MR25 5322 116 50484 1334 MR25 5322 116 54547 1336 402K MR25 5322 116 55283 1337 MR25 4822 116 51179 1338 MR25 5322 116 54547 1339 402K MR25 5322 116 55283 1347 MU25 4822 116 51179...
  • Page 128 7-21 ORDERING CODE POSNR DESCRIPTION 1447 MR25 4822 116 51253 1448 MR25 5322 116 50583 MR25 4822 116 51268 1449 MR25 1451 5322 116 54595 1452 MR25 5322 116 50484 MR25 5322 116 54655 1453 MR25 5322 116 54632 1456 MR25 1457 5322 116 50586...
  • Page 129 7-22 POSNR DESCRIPTION ORDERING CODE 1551 MR25 4822 116 51179 MR25 5322 116 54482 1552 4822 116 51235 1553 MR25 5322 116 54595 MR25 5322 116 50572 MR25 5322 116 50664 MR25 5322 116 50767 5322 116 55258 MR25 511K 5322 116 55426 MR25 MR25...
  • Page 130 7-23 POSNR DESCRIPTION ORDERING CODE MR25 4822 116 51235 TRIMMING POTM, 5322 101 14069 MR25 5322 116 50506 MR25 4822 116 51259 MR25 5322 116 54595 4822 111 30067 MR25 5322 116 54192 FILM RESISTOR, MR25 5322 116 55549 MR25 5322 116 50926 MR25 5322 116 55422...
  • Page 131 7-24 ORDERING CODE POSNR DESCRIPTION 5322 101 14069 5322 116 50904 MR25 RESISTOR 5322 116 52123 MR25 MR25 4822 116 51253 4822 116 51253 MR25 5322 116 50904 5322 116 54192 MR25 5322 116 50675 MR25 MR25 5322 116 50675 4822 116 51259 MR25 5322 116 54595...
  • Page 132 7-25 ORDERING CODE POSNR DESCRIPTION 4822 116 51282 MR25 MR25 5322 116 54192 5322 116 54442 MR25 5322 116 54442 MR25 R 526 5322 116 54571 MR25 MR25 5322 116 54034 5322 116 54474 MR25 R 529 4822 116 51235 MR25 R 531 5322 116 54541...
  • Page 133 7-26 CODE DESCRIPTION ORDERING POSNR MR25 5322 116 55641 365K 5322 116 55499 348K MR25 5322 100 10141 5322 116 50675 MR25 4822 116 51266 MR25 5322 116 54279 R 621 115K 5322 100 10141 POTM, TRIMMING MR25 5322 116 54623 MR25 4822 116 51179 5322 116 51394...
  • Page 134 7-27 POSNR DESCRIPTION ORDERING CODE MR25 5322 116 54459 MR25 5322 116 54466 MR25 5322 116 50452 MR25 5322 116 55549 988K MR30 5322 116 51401 5322 116 55148 MR25 5322 116 54014 172K MR30 5322 116 51399 920K MR30 5322 116 55218 5322 116 54875 825K...
  • Page 135 7-28 POSNR DESCRIPTION ORDERING CODE 5322 116 54426 4822 116 51268 4822 116 51253 MR25 MR25 5322 116 55571 5322 116 50412 MR25 RESISTOR FILM 5322 116 50412 MR25 5322 100 10133 R I FIM I N G 5322 116 55367 MR25 R 806 MR25...
  • Page 136 7-29 POSNR DESCRIPTION ORDERING CODE MR25 5322 116 55549 MR25 5322 116 50926 MR25 5322 116 50926 MR25 4822 116 51232 MR25 5322 116 55448 MR25 5322 116 54595 4822 116 51268 MR25 4822 116 51268 R 907 5322 100 10139 MR25 5322 116 55549 MR25...
  • Page 137 7-30 ORDERING CODE DESCRIPTION POSNR MR25 5322 116 50672 FI LM RESISTOR YR25 5322 116 50515 4822 116 51253 YR25 5322 116 54595 4822 110 72196 FILM 51 1 YR25 4822 116 51282 YR25 5322 116 54511 YR25 4822 116 51282 YR25 4822 116 51282 FILM...
  • Page 138 ORDERING CODE POSNR DESCRIPTION 4822 130 41782 1313 TRANSISTOR 4822 130 41646 1314 TRANSISTOR 4822 130 41646 1316 TRANSISTOR 4822 130 41782 TRANSISTOR 1317 DIODE 4822 130 30613 1318 1319 4822 130 30613 TRANSISTOR 4822 130 41448 1371 1372 TRANSISTOR 4822 130 41448 TRANSISTOR 4822 130 44197...
  • Page 139 7-32 ORDERING CODE POSNR DESCRIPTION 4822 130 44196 TRANSISTOR 4822 130 44197 TRANSISTOR 4822 130 44196 TRANSISTOR 4822 130 30613 BAN62 DIODE 5322 130 41664 TRANSISTOR 4822 130 44197 TRANSISTOR 4822 130 30613 DIODE 4822 130 30613 DIODE 4822 130 30613 DIODE 4822 130 30613 DIODE...
  • Page 140 7-33 ORDERING CODE POSNR DESCRIPTION 4822 130 30613 DIODE 4822 130 30613 DIODE 4822 130 30613 DIODE 4822 130 44196 TRANSISTOR 4822 130 44196 TRANSISTOR 4822 130 44196 TRANSISTOR 4822 130 44196 TRANSISTOR 4822 130 40493 TRANSISTOR 4822 130 40493 TRANSISTOR 4822 130 41448 TRANSISTOR...
  • Page 141 7-34 POSNR D E S C R I P T I O N ORDER I N G CODE V 8 6 3 TRANSISTOR 4 8 2 2 1 3 0 4 4 1 9 7 V 8 6 4 TRANSISTOR 4 8 2 2 1 3 0 4 4 1 9 6 V 8 6 5...

  • Page 142: Time-Base Unit P.c.b. With Component Location Raster

    7-38 Fig. 7.7. Time-base unit p.c.b. with component location raster...
  • Page 143 Capacitors C201 C202 A l l C203 C204 C206 C207 C208 C209 C211 C212 C213 C216 C218 C219 C221 C222 C223 C224 C225 C226 C227 C230 C232 C234 C236 C237 C238 C240 C241 C242 C243 C244 C246 C247 C248 C249 C250 C251 C252...
  • Page 144 7-40 7.7) 7.4. LOCATION LIST PARTS SITUATED THE TIME-BASE UNIT A2 (see Fig. C27 1 R216 C272 R217 R277 D 14lC14 C273 R218 R278 D 14lC14 R279 C274 R219 R 282 C275 R220 R 283 C276 R221 C277 R222 C278 C279 R224 R287...

  • Page 155: Location Of Electrical Parts

    ’ - LOCATION OF ELECTRICAL PARTS 8.1. have been divided in groups which relate to the circuit, the unit and the circuit diagram, according the following table. ltemnumber Location Unit Figure Potentiometer unit, front and rear side 8.17. 8 . 1 Switch unit 8.8.18.10.
  • Page 156 FROM V241-a TO R243 FROM V235-a TIME-BASE UNIT 2 TO X850 H F I I UNIT 102 PRINTING FACING PC.6 Fig. 8.1. Pre-amplifier and trigger-unit (unit 3), p.c. b. lay-out...
  • Page 157 COAXIAL CABLE CONNECTIONS ON UNIT. UNIT 103 UNIT 6 - CHOPPER BLANKING X206 UNIT 2. TIME - BASE UNIT POTENTIOMETER UNIT 103...

  • Page 158: Lay-Out

    FROM Xi502 ON FINAL X I 2 AMPLIFIER IVNIT 5 VERTICAL DEFLECTION BE CLOSED DURING AOJUSTMENT MAT1492 WAVE RESPONSE 8.2. Final lay-out Fig. Y-amplifier (unit...
  • Page 159 INPUT COUPLING HIGH-IMP A T T V710 v707 0701 - 7 c CORR R737 R738...
  • Page 160 LOW-IMP ATT + l A FROM RBI'. POSITION A FROM...
  • Page 161 VERTICAL CHANNEL SWITCH FINAL Y-AMPLIFIER (UNIT 91 MUST BE CLOSED DURING SQUARE WAVE ADJUSTMENT...
  • Page 162 01201...

  • Page 163: Time Base Unit

    8-1 1 TO R208 TIME-BASE UNIT SWITCH UNIT 102 SWITCH UNIT TIME-BASE UNIT EXT. LINE S I B - 6 ‘TIME- BASE V 701 UNIT 102 PRINTING FACING PC.6.

  • Page 165: Fig. 8.6. Circuit Diagram Delayed Time Base Triggering (Unit 3)

    8-1 5 C934 R1086 402E R921 V922 c935 TRIG TRIGGE SELECTION M T B Fig. 8.6. Circuit diagram delayed time-base triggering (unit...
  • Page 166 8-16 UNIT V906 MAT 1496...

  • Page 167: P.c.b. Lay-Out

    8-17 E X T - LINE TRIG P R E AMPL AND TRIGGER UNIT D T B 8.7. Fig. Trigger selection unit (unit MAT 1496...
  • Page 168 8-19 X206 UNIT 3 FROM X 8 0 6 CHOPPER BLANKING X207 FROM X6 2-MODE I- -- -- -- -- - TO V9OL-C TO V88L-a TO 5206-6 TO S2OA-5 UNIT 3 SWITCH...
  • Page 169 8-2 1 DTB TRIG FROM X867 UNIT 3 MTB TRIG FROM X868 UNIT 3 POTENTIOMETER UNIT 103 TRIGGER MODE SELECTION AUTO SINGLE CONT MAT1498 HOLD OFF...

  • Page 170: Fig. 8.9. Circuit Diagram Main Time Base

    18-21 8-21 FROM X806 Z - L O G I C E X T t TO 0203/5 C U R R E N T VOLTAGE CONVERTOR Circuit Fig. 8.9. diagram main time-base (unit 2)
  • Page 171 8-22 - 7 F HORIZONTAL CHANNEL TRACE SEP CIRCUIT SELECTION LOGIC ALT TB I" 0211 FROM MAT 1199 Fig. 8.9. Circuit diagram main time-base (unit...
  • Page 172 8-24 - 7 v 0201 TO R1017 X-DEFLECTION AMPLIFIER - 7F HORIZONTAL FROM S W E E P OTB CHANNEL SWITCH - 7F S W E E P , T O X 2 V l 3 7 l / b AMPL UNIT 1 2 2 3...
  • Page 173 8-23 SWITCH UNIT DURING ADJUSTMEN1 OF SWEEP SPEED5 MAIN TIME BASE GENERATOR HOLD OFF R367 HOLD OFF TIME BASE Fig. 8.9, Circuit diagram main time-base (unit 2)
  • Page 174 8-25 -- -- - FROM X 8 0 6 CHOPPER BLANKING TO 0631-15 X867 TO V9OL-C TO V88L-a TO 5206-6 TO S2OA-5 UNIT 3 SWITCH UNIT 102...
  • Page 175 8-26 DTB TRIG FROM X867 UNIT 3 MTB TRIG FROM X868 UNIT 3 AMPL U N I T 5 POTENTIOMETER UNIT 103 MTB CONT MAT 1498 (OPTION) HOLD Fig. 8.10. Time-base unit (unit...

  • Page 176: Fig. 8 . 1 1 . Circuit Diagram Delayed Time Base

    8-27 R262 - 7F M T B 0203 FROM M T B -7 F OTB TRIG C 2 7 0 FROM X869 10” Fig. 8.11. Circuit diagram delayed time-base (unit 2)
  • Page 177 8-28 X213 D E L A Y E D TIME B A S E GENERATOR R273 v 2 2 7 TO V21l v 2 1 2 M T B S W E E P GATING LOGIC...

  • Page 178: Final X Z - Amplifier- Unit 5

    8-29 TRACE ROT. COIL FINAL X Z - AMPLIFIER- UNIT 5 TO X l 2 0 l ON FINAL AMPLIFIER UNIT 91 TRACE ROTATION...
  • Page 179 TIMER- BASE UNIT x 2 0 2 F R O M V 2 L 9 A NOT TRIG. FROM D 2 0 2 - 1 2 FROM FROM X I 5 5 1 Z- INPUT T I M E - B A S E UNIT 2 TO PIN 3 - C R T TO PIN 7 CRT SOCKET ICATHOOEI TO PINIL CRT SOCKET...
  • Page 180 8-31 Z -AMPLIFIER CHAN B D T B XMAGN XMAGN Fig. Circuit diagram final X-amplifier, calibration unit and display section...
  • Page 181 8-32 : x 2 X151 FROM H V MULTIPLIER FOCUS ROTATION - 7 v CALIBRATION VOLTAGE - 7G FINAL X- AMPLIFIER 4 5 v 5 5 v...
  • Page 182 8-33...

  • Page 183: Power Supply Unit

    8-34 > PREAMPLIFIER TRIGGER UNIT [UNIT R970 A M P L I F I E R FROM POWER Fig. 8.14. Power supply unit (unit...

  • Page 188: Voltage-Waveforms In The Instrument

    The t e s t points are marked on the units. The required t e s t equipment consists o f an oscilloscope of 100 MHz (e.g. Philips PM 3262) with a suitable attenuator probe. The input square wave signal for the "oscilloscope under t e s t " can be obtained from a function generator Standard-settings for the "oscilloscope under test"...

  • Page 189: Vertical Deflection And Triggering

    VERTICAL DEFLECTION A N D TRIGGERING Unit Measuring oscilloscope: 0.1 V/div. 20 ps/div. DC input coupling Oscilloscope under test: channel A channel Measu ring osci I loscope : 20 psfdiv. DC input coupling Oscilloscope under test: channel A channel B Measu ri ng oscilloscope: DC input coupling Oscilloscope under test:...
  • Page 190 Measuring oscilloscope : 5 mV/div. AC input coupling Oscilloscope under test: Select vertical display via channel A and Measuring oscilloscope: 0.1 Vldiv. 1 ms/div. DC input coupling Oscilloscope under t e s t : Select vertical display mod( ALT combined with TRIG VIEW Measuring oscilloscope : 0.1 Vldiv.
  • Page 191 Measu ring oscil loscope : 5 mV1div. 20 ps/d AC input coupling Oscilloscope under test: channel A. channel Measuring oscilloscope: 20 psldiv. AC input coupling Oscilloscope under test: MTB triggering via COMP. Waveform depends on chai and B position control. Depress A L T of S1 NOTE: For the following measurements the Trigger selection unit must be lifted.
  • Page 192 Measuring osci I loscope: 20 mV1div. AC input coupling Oscilloscope under test: Select MTB triggering via the EXT input. Apply the channel A/B input signal t o EXT input socket. Measuring oscilloscope : 20 psldiv. AC input coupling Oscilloscope under test: Select MTB triggering via COMP.
  • Page 193 Measuring oscilloscope: AC input coupling Osci I I oscope under test: Measuring osci I loscope : AC input coupling Oscilloscope under test: L F trigger coupling of MTB. Measuring oscilloscope: AC input coupling Oscilloscope under test: trigger coupling of M TB.
  • Page 194 Measuring oscilloscope : 50 mV/div. AC input coupling M easu r i n g o sc AC input coupling Oscilloscope under t e s t : This t e s t point is located on the trigger selection unit. Select MTB triggering via the EXT input.
  • Page 195 Measuring osci I loscope : 20 mVIdiv. AC input coupling Measuring oscilloscope: AC input coupling. Oscilloscope under t e s t : DTB. trigger coupling Measuring oscilloscope: AC input coupling Oscilloscope under t e s t : of DTB. trigger coupling...

  • Page 196: Horizontal Deflection

    HORIZONTAL DE F L ECTlON Unit Measuring oscilloscope: 0.1 Vldiv. 20 p l d i v . DC input coupling M easu ring osci I I osco pe : 0.2 Vldiv. 0.5 msldiv. DC input coupling Measuring osci I loscope: 0.2 Vldiv.
  • Page 197 9-1 0 Measuring oscilloscope: Vldiv. 0.5 msldiv. DC input coupling. Oscilloscope under test: Select ALT TB mode (S2). Adjust the DTB to 20pIdiv. Operate the HOLD OFF control t o avoid "double" triggering. Measuring oscilloscope msldiv. DC input coupling. Measuring oscilloscope: 0.5 msldiv.
  • Page 198 9-1 1 Measuring osci I loscope : DC input coupling Oscilloscope under test: Adjust the DTB t o Select A L T TB mode Depress A of Measuring oscilloscope: 0.2 msldiv. DC input coupling. Oscilloscope under test: Adjust the DTB t o 20 psldiv. Select DTB mode (S2).
  • Page 199 9-1 2 Measuring oscilloscope: 0.1 Vldiv. 0.5 msldiv. DC input coupling Oscilloscope under test: Adjust the DTB t o 20 psldiv. Select DTB mode (S2). Measuring oscilloscope: 0.1 Vldiv. 0.5 msldiv. DC input coupling. Oscilloscope under test: Adjust the DTB t o 20 p l d i v . Select A L T TB mode Operate the HOLD OFF control t o avoid “double”...

  • Page 200: Powersupply

    9-13 9.4. POWER SUPPLY Unit 6 Measuring osci I loscope: Vfdiv. 5 msfdiv. DC input coupling Measuring oscilloscope : 2 Vfdiv. 20 psfdiv. DC input coupling Measuring oscilloscope: 2 Vfdiv. DC input coupling...
  • Page 201 The information contents of the coded failure description necessary for our computerized processing of quality data. Since the reporting of repair and maintenance routines must be complete and exact, we give you an example of a correctly filled-out PHILIPS SERVICE Job sheet. Country Day Month Year /Version...
  • Page 202 5631717 CEP 01401 tel. 2821fi11 P.O. Box. 20104. Dar es Salaam: tel. 29571 Service Centre. Thailand: Philips Electrical Co. o f Thailand Ltd.. 283 Silorn Road. P.D. Box 961, Bangkok Caixa Portal 3159 S. Amaro. CEP 04752 Lebanon: Philipr Middle €art A.P L.,...

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