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Tektronix 442 Instruction Manual

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THE FOLLOWING SERVICING INSTRUCTIONS ARE
FOR USE BY QUALIFIED PERSONNEL ONLY. TO
AVOID PERSONAL INJURY, DO NOT PERFORM ANY
SERVICING OTHER THAN THAT CONTAINED IN
OPERATING INSTRUCTIONS UNLESS YOU ARE
QUALIFIED TO DO SO.
Tektronix, Inc.
P.O. Box 500
Beaverton, Oregon
97077
070-2374-01
Tektronix
WARNING
INSTRUCTION
Serial Number
COMMITTED TO EXCELLENCE
MANUAL
First Printing AUG 1977

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  • Page 1 FOR USE BY QUALIFIED PERSONNEL ONLY. TO AVOID PERSONAL INJURY, DO NOT PERFORM ANY SERVICING OTHER THAN THAT CONTAINED IN OPERATING INSTRUCTIONS UNLESS YOU ARE QUALIFIED TO DO SO. INSTRUCTION MANUAL Tektronix, Inc. P.O. Box 500 Beaverton, Oregon 97077 Serial Number First Printing AUG 1977 070-2374-01...
  • Page 2 WARRANTY .Tektronix warrants that this product is free from defects in materials and workmanship. The warranty period is one (1) year from the date of shipment. Tektronix will, at its option, repair or replace the '.product if Tektronix determines it is defective within the warranty ' period and if it is returned, freight prepaid, to a service center „...

  • Page 3: Table Of Contents

    442 Service TABLE OF CONTENTS Page Page LIST OF ILLUSTRATIONS ........Section 4 CALIBRATION PROCEDURE.... 4-1 LIST OF TABLES........... GENERAL..........4-1 SAFETY SUMMARY..........Introduction........4-1 Test Equipment R equired....4-1 Section 1 SPECIFICATION ........ PERFORMANCE CHECK ....ELECTRICAL CHARACTERISTICS . . 1-1 Introduction........

  • Page 4: List Of Illustrations

    Controls and switches accessible through 4- 13 Triggering and X-Axis adjustment locations the bottom of the 442 c a b in e t....on the A11 Trigger Switch b o a rd .... 4-26 Vertical system c o n tro ls ......2-5 5- 1 Cabinet removal........
  • Page 5 Horizontal Output board location 7-15 A2—Power Supply circuit board All—Trigger Switch circuit board component locations 7-9B component locations for SN below 7-16 Power Supply board location B021532 7-17 442 Oscilloscope troubleshooting chart 7-10 Trigger Switch circuit board location REV A MAY 1980...

  • Page 6: List Of Tables

    442 Service LIST OF TABLES Table Page Electrical Characteristics....Environmental Characteristics..Physical Characteristics..Power Cord Conductor Identification . . . 2-1 Ac Regulating Ranges ......2-2 Power Input Fuse Values..2-2 Attenuator and Gain Switching Sequence 3-3 Test Equipment R equired... 4-1 Vertical Deflection A ccuracy....
  • Page 7 442 Service OPERATORS SAFETY SUMMARY The general safety information in this part of the summary Grounding the Product is for both operating and servicing personnel. Specific This product is grounded through the grounding conduc­ warnings and cautions will be found throughout the tor of the power cord.
  • Page 8 442 Service SERVICE SAFETY SUMMARY FOR QUALIFIED SERVICE PERSONNEL ONLY Refer also to the preceding Operators Safety Summary. Do Not Service Alone Disconnect power before removing protective panels, soldering, or replacing components. Do not perform internal service or adjustment of this product unless another person capable of rendering first aid and resuscitation is present.
  • Page 9 442 Service 442 Oscilloscope. viii REV A MAY 1980...

  • Page 10: Section 1 Specification

    20 minutes. The adjustment procedure in Section 4, from 2 mV to 10 V/div. The Time Base provides stable when performed completely, allows the 442 to meet the triggering over the full bandwidth of the Vertical Amplifier electrical specification listed in Table 1-1.
  • Page 11 Specification—442 Service Table 1-1 (cont) Characteristics Performance Requirements Supplemental Information VERTICAL SYSTEM (cont) CMRR (DIFF Mode) At least 10:1 at 1 MHz in 10 mV/div (IX window) position for common mode signals of 8 divisions or less with gain adjusted for best CMRR at 50 kHz.
  • Page 12 Specification—442 Service Table 1-1 (cont) Characteristics Performance Requirements Supplemental Information VERTICAL SYSTEM (cont) Dc to at least 2 MHz. X-Axis Bandwidth 5-division reference signal. Approximately 1 Mfi. Input Resistance Input Capacitance Approximately 30 pF. Maximum Input Voltage 400 V (dc + peak ac).

  • Page 13: Environmental Characteristics

    Specification—442 Service Table 1-1 (cont) Supplemental Information Characteristics Performance Requirements Z-AXIS INPUT (cont) Usable Frequency Range Dc to 5 MHz. 30 V (dc + peak ac). 30 V p-p Maximum Input Voltage ac at 1 kHz or less. Approximately 10 kQ.

  • Page 14: Physical Characteristics

    Specification—442 Service Table 1-2 (cont) Characteristics Description Humidity Operating and Non-operating 5 cycles (120 hours) referenced to MIL-E-16400F. Vibration (Operating) 15 min along each of 3 major axes at a total displacement of 0.025” p-p (4 g’s at 55 Hz) with frequency varied from 10 Hz to 55 Hz to 10 Hz in one minute sweeps.

  • Page 15: Oscilloscope Dimensions

    Specification—442 Service FRONT VIEW 5.60 INCHES (14.22 cm) 11.25 INCHES (28.57 cm) 12.95 INCHES (32.89 cm) 2 3 7 4 -2 A Figure 1-1. 442 Oscilloscope dimensions. REV A MAY 1980...

  • Page 16: Section 2 Operating Instructions

    OPERATING INSTRUCTIONS INTRODUCTION The TEKTRONIX 442 Oscilloscope is a 35 MHz maximum bandwidth instrument with dual trace capability. A dual trace dc to 35 MHz vertical system provides calibrated deflection factors from 2 mV/divto 10 V/div. Triggering circuits provide stable triggering over the full vertical bandwidth. A horizontal deflection system provides calibrated sweep rates from 0.5 s/div to 0.1 //s/div.

  • Page 17: Commonly Used Power Plugs

    240 VOLT/50 Hz RATED 10 AMPERE The 442 power input fuse is located in a fuse holder on the back panel of the 442. See Figure 2-3. ( 2 3 8 9 - 7 6 ) 2 7 5 7 - 6 6 Figure 2-1.

  • Page 18: Indicators

    Operating Instructions—442 Service Figure 2-3. Power input fuse location on the 442 back panel. Figure 2-4. Crt Display and Power front panel controls and CONNECTORS, connectors. C O N T R O L S , A N D INDICATORS BEAM FINDER Introduction Spring-loaded push-button switch to locate off­...

  • Page 19: External Z Axis Input Connector On The

    ( ? ) ON indicator (LED) POWER INPUT SELECTOR SWITCHES and DC BALANCE CONTROLS Lights when power is applied to the 442 and the POWER ON/OFF button is pressed in. (Bottom of Cabinet. See Figure 2-6.) © ON/OFF Push Button Switch C A U T I O N Turns instrument ON (in) and OFF (out).

  • Page 20: Controls And Switches Accessible Through

    Channel 2 (Y) is the vertical ( Y-axis) signal input clockwise detent) position, these controls when the 442 is set for X-Y operation. The provide continuously variable (uncalibrated) TRIGGERING SOURCE switch must be set to X-Y deflection factors between...
  • Page 21 X-Y. (2?) Ground Symbol (External Ground Jack) Banana jack electrically and mechanically con­ nected to front panel and internal chassis to allow grounding the 442 to an external ground. MODE (22) VERT (Vertical Display Mode Switches) Five push-button switches that determine the vertical display signal source and operating mode.

  • Page 22: Triggering System C O N Tro Ls

    Operating Instructions—442 Service LINE: In this position, the trigger signal is derived from a sample of the line voltage applied to the instrument. EXT: (External Triggering): This position per­ mits triggering from signals applied to the external trigger input connector (item 28).

  • Page 23: Basic Oscilloscope Operation

    The most reliable signal measurements are made when the 442 and the unit under test are connected together by a - (in): Allows triggering from the negative- common reference (ground) lead in addition to the signal going slope of a trigger signal.

  • Page 24: Probe Compensation

    1 or channel 2 input connector and graticule divisions. Duration = 1/frequency. If a 60 Hz touch the probe tip to the 442 front panel PROBE ADJ pin power line frequency is being used, check that the connector.

  • Page 25: Display Of 0.5 V Probe Adj Output Signal

    Set VERT MODE switches to display the channel selected. 2. Connect the PROBE ADJ signal (via the probe supplied with the 442) to the Channel 1 or X input connector. Set the VOLTS/DIV switch to display about 5 divisions of waveform amplitude.

  • Page 26: Measuring Peak-To-Peak Voltage Of A Waveform

    Operating Instructions—442 Service Multiply the distance measured in step 6 by the Position the trace to the bottom line of the graticule VOLTS/DIV switch reading. or other reference line. If the voltage to be measured is negative with respect to ground, position the trace to the top line of the graticule.
  • Page 27 Operating Instructions—442 Service EXAMPLE: Assume that vertical distance paring harmonic signals to a fundamental frequency, or measured is 4.6 divisions (see Figure 2-13), the waveform for comparing the repetition rate of input and output is above the reference line, and the VOLTS/DIV switch pulses in a digital count-down circuit.
  • Page 28 Operating Instructions—442 Service Measure the vertical deflection in divisions, and 5. To measure the period of a signal, disconnect the calculate the amplitude of the unknown signal using the reference signal and connect the questioned signal to the following formula: selected channel input connector.

  • Page 29: Measuring The Time Duration Between

    Operating Instructions—442 Service Frequency Measurements measurement points (see Figure 2-14). The MAGNIFIER may be set to X10 (button in) to expand the display when The time measurement technique can also be used to measuring portions of more complex waveforms. If this determine the frequency of a signal.

  • Page 30: Measuring Time Difference Between Two Pulses

    ..(divisions) The calibrated sweep rate and dual-trace features of the 442 allow measurement of time difference between two separate events. To measure time difference, use the Substituting the given values: following procedure: Time Difference = 50 fjs X 4.5...

  • Page 31: Measuring Phase Difference

    45°/division as shown in Figure 2-17. Using the formula: frequency can be made using the dual-trace feature of the 442. This method of phase difference measurement can be Phase Difference = used up to the frequency limit of the vertical system. To horizontal make a phase comparison measurement, use the follow­...

  • Page 32: Phase Difference Measurement With An X-Y Display

    4. Center the display around the center graticule lines. The internal crt graticule lines in the 442 are not Measure the distance A and B as shown in Figure 2-18. illuminated, and may not be visible on a photograph of the Distance A is the horizontal measurement between two crt display when using ordinary photographictechniques.
  • Page 33 2. Surround the instrument with polyethylene sheet­ Required Reshipment Information ing to protect the finish and prevent packing material from If the instrument is to be shipped to a Tektronix Service entering the instrument. Center for service or repair, attach a tag containing the following information: 3.

  • Page 34: Section 3 Theory Of Operation

    GENERAL VERTICAL SWITCHING The Vertical Mode switches select the desired channel This section describes circuitry used in the 442 presentation and an appropriatetrigger signal. The output Oscilloscope. The description begins with a discussion of of each Preamplifier is connected to the Delay Line Driver operation usingthe block diagram shown in Diagrams and through a corresponding Input Buffer and a Diode Gate.

  • Page 35: Probe Adj

    The Probe Adjust Generator provides a square-wave dividers that provide constant attenuation at all frequen­ voltage output for checking and adjusting the compensa­ cies within the bandwidth of the 442. Input RC tion of voltage probes. characteristics (approximately 1 M fi times approximately...
  • Page 36 R4121 determines the 1 MQ input resistance, and R4122 limits the current drive to the gate of Q4122A. Diode Digital logic devices are used in the 442 to perform CR4122 protects the circuit from high negative-going some functions. LO and HI designations are used in this input signals by limiting voltages at the gate of Q4122A to description to indicate the states of the digital circuitry.
  • Page 37 Theory of Operation—442 Service Components C4396, R4396, C4397, C4395, R4397, In ALTernate or CHOPped Vertical Mode, Channel 1 C4398, and R4398 provide compensation (peaking) to and Channel 2 are alternately connected tothe delay line correct for delay line losses. driver. The setting of the SEC/DIV switch should be considered when selection of ALT or CHOP mode is made.
  • Page 38 Theory of Operation—442 Service output voltage controls the display intensity level by VERT OUTPUT AM PL, CRT, AND PROBE changing the dc voltage level at the junction of R462, C463, and C464. (Diagram 3) Vertical Output Amplifier Crt Circuit The Vertical Output Amplifier circuit provides final...

  • Page 39: Trigger

    When the output (pin 1 or 6 depending on serial number provides about 6.3 V for the crt filament. The crt filament is of the 442) of U24 is positive, voltage divider R22-R23 sets referenced to the cathode voltage (= -2 kV), preventing pin 3 at a positive voltage.
  • Page 40 Theory of Operation—442 Service COMP. The signal at P2000-1, from the collector of amplifier to center the crt display. +8 volts is also applied Q4388 (Vertical Switching diagram), is a portion of the to CR2182 and R2185 to electrically pi ace the sweep in the output of the delay line driver.

  • Page 41: Sweep And Horizontal Amplifier

    Theory of Operation—442 Service trigger input amplifier Q2164 and the normal trigger input When the MODE switch S2150 is in AUTO or NORM, +8 amplifier (Q2142, Q2144, and Q2152). When the SLOPE volts is applied to R2156, which causes pin 1 of U2156Ato switch is in the +OUT position, the output at the collector go HI enabling Schmitt trigger U2156A-U2156B.

  • Page 42: Horizontal Output Amplifier

    Theory of Operation—442 Service HORIZONTAL OUTPUT AMPLIFIER (Diagram 6) Transistors Q2332, Q2334, Q2344, and associated circuitry form a paraphase amplifier. Transistor Q2332isa low-impedance input for Q2334. Horiz Gain adjustment R2332 sets the gain of the paraphase amplifier. When the current through the collector of Q2334 increases, the current through the collector of Q2344 decreases and is 180°...

  • Page 43: Foldback Circuit A Ctio N

    Theory of Operation—442 Service merit may be operated from a 110 V to 132 V or 220 V to voltage difference remains constant, the increasing 250 V rms powerinput source, depending onthesetting of voltage on Q756 emitter due to the R754 voltage drop the 120 V/240 V Line Selector switch, S701.

  • Page 44: Section 4 Calibration Procedure

    Section 4—442 Service CALIBRATION PROCEDURE GENERAL accomplished on the oscilloscope. A partial list of test equipment is provided in the Performance Check subsec­ Introduction tion to list the required test equipment to complete the Performance Check only. This section of the manual is in two parts: Performance Check and Adjustment Procedure.

  • Page 45: Cabinet Rem Oval

    Attenuation, 10X; connector, 15. Probe Vertical attenuator a. TEKTRONIX P6108 bnc; compensation range, compensation, TV trigger 10X probe 010-6108-03 to match the 442 vertical checks. Low-frequency (standard accessory input characteristics. triggering check. for the 442). Bit, Phillips #1. 16. Screwdriver Interface board removal.

  • Page 46: Performance Check

    8. 10X Probe (442 Standard Accessory) Refer to the Preliminary Procedure preceding the 9. IX Probe Performance Check steps for instructions on setting the 442 for the available power input source voltage. 10. Bnc female-to-female adapter 11. Television Signal Source Test Equipment...

  • Page 47: Preliminary Procedure

    NOTE deleted. The 442 must have a warmup time of at least 20 minutes before starting the Performance Check Preparation Procedure, and must have been adjusted at an ambient temperature between +20°...

  • Page 48: Procedure

    The following procedure is arranged to be per­ formed in its entirety, starting with Step 1 and proceeding in sequence to the end. This ensures the Table 4-2 correct 442 and test equipment settings and connec­ tions for each step. VERTICAL DEFLECTION ACCURACY VOLTS/DIV...
  • Page 49 Calibration Procedure—442 Service Performance Check d. Set: d. CHECK—Duration of one cycle is within ap­ proximately 3.33 to 6 (3.3 to 6 horizontal graticule VERT MODE CH 1 divisions). AC-GND-DC (Channel 1) AC-GND-DC (Channel 2) e. Set the LEVEL control fully clockwise.

  • Page 50: Bandwidth Check Test Setup

    Calibration Procedure—442 Service Performance Check b. Set: 7. X-Axis Bandwidth Check SOURCE CH 1/CH 2 a. Set: VOLTS/DIV (CH 1 & CH 2) 5 m (IX) SOURCE SEC/DIV .1 m VERT MODE CH 2 (X-Y) AC-GND-DC (CH 1 & CH 2) DC...
  • Page 51 Calibration Procedure—442 Service Performance Check NOTE 10. Internal Triggering 2 MHz Check a. Connect the test equipment as shown in Figure 4-3. In the following Triggering check steps, adjust the LEVEL control, POSITION controls, and INTEN­ SITY control for a visible, stable triggered display b.
  • Page 52 Calibration Procedure—442 Service Performance Check LEVELED SINE-WAVE GENERATOR 442 OSCILLOSCOPE 2 3 7 4 - 7 A Figure 4-3. Triggering and Z-Axls input check test setup. 12. Internal Triggering 35 MHz Check 14. EXT and EXT/10 LEVEL Range Check a. Set: a.
  • Page 53 .5 p .5 ps TRIGGERING input connector and connect it to the Z 50 p .50 ps AXIS INPUT connector on the back panel of the 442. .1 m .1 ms .5 m .5 ms .2 (s) .2 (sec) d.
  • Page 54 NOTE This step may be omitted if the 442 is not planned to Set Channel 1 VOLTS/DIV and VAR to display 1 be used for displaying television sync signals. A division of composite sync signal (or 2.3 divisions of...

  • Page 55: Adjustment Procedure

    Adjustment Procedure Adjustment Procedure steps for instructions on setting including all subsections. the 442 for the available power input source voltage. When performing only a partial procedure, each sub­ section lists all the front panel control settings to prepare Internal Adjustments and Adjustment Interaction the instrument for step 1 in that subsection.
  • Page 56 Special calibration fixtures are used only where they facilitate instrument adjustment. These fixtures are 1. Attach the front cover on the 442 and position the available from Tektronix, Inc. Order by part number 442 face down (supported by the cover) on a work bench through your local Tektronix Field Office or represen­...

  • Page 57: Preliminary Procedure

    After knob/shaft reinstallation, rotate both controls fully counterclockwise. NOTE The 442 may be calibrated in either of two basic NOTE positions: in a horizontal plane or in a vertical plane. If the vertical plane (front panel facing upward) is...

  • Page 58: Moving Interface Board To Adjustment Access Position

    C a lib ra tio n P ro ce d u re— 442 Service A d justm en t P ro ced ure R E M O V E S C R E W CIRCUIT P L A S T IC...
  • Page 59 Adjust the INTENSITY and FOCUS con­ NOTE trols for a low-intensity, well-defined trace. The 442 must have a warmup time of at least 20 minutes before starting the Adjustment Procedure, NOTE and must be adjusted at an ambient temperature between 20°...

  • Page 60: Display And Power Supply

    Step 1 , part a, skip part band proceed to part c. If the ..8 V adjustment is changed for any reason, the accuracy of all circuitry in the 442 will be affected and the entire Adjustment Procedure should be performed.

  • Page 61: Interface Board Adjustment Locations (Board Shown In Access Position)

    Calibration Procedure—442 Service Adjustment Procedure 2. TRACE ROT (Trace Rotation) f. INTERACTION—Set the Channel 1 AC-GND-DC switch to GND and set the Channel 1 POSITION control to Set the Vertical POSITION control to move the trace move the baseline to the center horizontal graticule line.

  • Page 62: Vertical Amplifier

    (SN B010100-B010408) for minimum trace shift while Procedure at the beginning of this Adjustment alternately pressing the DIFF and CH 2 Vertical Mode Procedure to prepare the 442 for adjustment. buttons (see Figure 4-9 for location of adjustments). 4-19 REV A MAY 1980...
  • Page 63 ADJUST— C4105 (see Figure 4-9) for the best front SEC/DIV .2 m corner on the square-wave display (see Figure 4-10 for TRIGGERING MODE AUTO example). Disconnect the test equipment from the 442. SOURCE CH 1/CH 2 CPLG LEVEL Fully cw f.

  • Page 64: Vertical Attenuator, Preamplifier, Delay Line

    ADJUST—C4205 (see Figure 4-9) for the best MINIM UM square front corner (see Figure 4-10 for example). ABERRATIONS Disconnect the test equipment from the 442. HERE (1 9 8 2 -2 1 ) 2 3 7 4 -7 5 Figure 4-10. Display of correct (idealized) attenuator f.
  • Page 65 Move the 50 Q termination for the square-wave signal from the Channel 1 input connector to the Channel 2 input connector. m. Disconnect the test equipment from the 442. ADJUST—(For serial numbers B010409 through B022163) C4255 (see Figure 4-9) for best front corner of 6.

  • Page 66: Horizontal

    Introduction and Preliminary Procedure at the beginning of this Adjustment Procedure to prepare the 442 for adjustment. The 442 should display a baseline trace with the foregoing control settings. Set the INTENSITY, FOCUS, ASTIG, and POSITION controls as required to maintain a well-defined medium-intensity display wit hint he graticule area.

  • Page 67: Horizontal Adjustment Locations On A12

    Calibration Procedure—442 Service Adjustment Procedure g. INTERACTION—Between XI and X10MAGNIFIER settings. Repeat adjustment of R2321 and R2330 and re­ FRONT set Horizontal POSITION control until there is no change PANEL SWEEP TIM ING in time marker position when switching MAGNIFIER from (H IG H SPEED) XI to X I0.

  • Page 68: Triggering

    50 f i BNC Terminations (Item 20, two required) Small Screwdriver (Item 18) 50 Q BNC Cable (Item 12) PROCEDURE a. Set the 442 front panel controls as follows: INTENSITY For a visible 1. Internal Trigger DC Level, Composite Trigger DC...
  • Page 69 S ection 4— 442 Service CALIBRATION PROCEDURE GENERAL accomplished on the oscilloscope. A partial list of test equipment is provided in the Performance Check subsec­ Introduction tion to list the required test equipment to complete the Performance Check only. This section of the manual is in two parts: Performance Check and Adjustment Procedure.

  • Page 70: Section 5 Maintenance

    Interface board or the Horizontal board) by performing ure 5-1): the following steps (see Figure 5-2): 1. Attach the front cover on the 442 and position the 1. Remove the FOCUS and INTENSITY knob/shaft 442 face down (supported by the cover) on a work bench assemblies by disconnecting them from the poten­...

  • Page 71: Preventive Maintenance

    Maintenance—442 Service Slide the Interface board toward the rear of the 442 to clean the interior is to blow off the accumulated dust to clear the BEAM FINDER and ON/OFF push but- with dry, low-pressure air (approximately 9 pounds per ton/shaft assemblies from the front panel openings.

  • Page 72: Moving Interface Board To Access Position

    Maintenance—442 Service REMOVE SCREW OC CIRC UIT BOARD HOLDERS (#2 PHILLIPS) INTERFACE BOARD REMOVE SCREWS IN NORMAL OPERATING ‘ Si PHILLIPS) POSITION REMOVE FOCUS & INTENSITY KNOB/SHAFT ASSEMBLIES INTERFACE BOARD FROM FRONT PANEL PLACED IN ADJUSTMENT OPENINGS AND REINSTALL ACCESS POSITION...

  • Page 73: Troubleshooting

    Maintenance—442 Service CRT. A blue plastic light filter is installed on the 442 at understanding of the circuit operation is helpful in the factory. Clean the light filter and the crt face with a soft locating troubles, particularly where integrated circuits lint-free cloth dampened with denatured alcohol or a mild are used.

  • Page 74: Color Codes

    - POLARITY AND VOLTAGE RATING PRESENT ON SOME CAPACITORS © - TOLERANCE; F=±1% , J=5%, K=10%, M=20% © - COLORS IDENTIFY SIGNIFICANT DIG ITS IN TEKTRONIX PART NUMBER (E.G., BROWN, GRAY, GREEN STRIPES INDICATE PART NUMBER 152-0185-00) RESISTORS(Q) CAPACITORS(pF) DIPPED...

  • Page 75: Semiconductor Lead Configuration

    Maintenance— 442 Service TRANSISTORS INTEGRATED CIRCUITS 2 3 7 4 - 2 0 A Figure 5-4. Semiconductor lead configuration. REV A MAY 1980...

  • Page 76: Multi-Pin Connector Holder Indexing

    Some ceramic capacitors used in the 442 are color coded in picofarads, using a modified El A code (see Figure 5-3). The dipped tantalum capacitors used in the 442 are color coded in microfarads (see Figure 5-3).
  • Page 77 The symptom often identifies the circuit in which the conditions. The 442 control settings required to trouble is located. For example, poor focus indicates that obtain the listed waveforms and voltages are located the crt circuit (including the high voltage supply) is adjacent to the waveform illustrations.
  • Page 78 High currents may damage the diode. Do not measure tunnel diodes with an ohm­ meter; use a dynamic tester (such as a TEKTRONIX Type 576 Transistor-Curve Tracer). Checks on Another frequent cause of cam switch failure is solder diodes can be performed in much the same manner smoke residue.
  • Page 79 Maintenance—442 Service Troubleshooting Hints If neither the — 2 kV or a 50 kHz sine wave are present, check Q454, Q458, and Q446. Power SYMPTOM—No visible trace and no display when the BEAM FINDER button is pressed in (POWER ON LED is illuminated—if LED is not illuminated, check F700andthe...
  • Page 80 Maintenance—442 Service Short plug pins P4-9 to P4-11 on the A8 Vertical Connect a signal to the Channel 1 input and check board. If the trace still does not center vertically, the for a trigger pulse at the output of U2156B. If there is no problem may be in the vertical output circuitry.

  • Page 81: Corrective Maintenance

    5. Keep the component leads shorted together ment damage, observe the following precautions. whenever possible. 1. Disconnect the 442 from the power source before removing or installing components. 6. Pick up components by the body, never by the leads. 2. Use care not to interconnect instrument grounds, 7.
  • Page 82 Level sa MOS or CMOS microcircuits or discretes, ORDERING PARTS. When ordering replacement or linear microcircuits parts from Tektronix, Inc., it is imperative that all of the with MOS inputs (Most Sensitive) following information be included in order to ensure receiving the proper parts.
  • Page 83 (chassis-mounted power supply transistors are insulated from the chassis). The line voltage fuse, F700, is located in an externally accessible holder located on the back panel of the 442. Reinstall the insulators and replacethe silicone grease when replacing these transistors. The grease should be...

  • Page 84: Pin Connector Re-Installation In Multi-Pin

    Bend the slotted portion of the holder back to its plastic holders). Two types of multi-pin connectors are original position so connectors are captivated in the used in the 442, with different size holders. holder. If the larger multi-pin holder assemblies are damaged,...
  • Page 85 Contact Replacement. Cam Switch contacts in this assistance in repair of the cam switches, contact instrument are part of a contact strip assembly. Refer to your local Tektronix Field Office or representative. the Replaceable Mechanical Parts list for ordering infor­ mation.

  • Page 86: Attenuators, Attenuator Shift, Horizontal

    VOLTS/DIV VAR potentiometer at the end of the attenuator chassis toward the back of the 442. RETAINER BUSHING NOTE For some serial numbers of the 442, the VOL TS/DIV VAR potentiometers may be mounted with their RECESSED terminals connected directly to the Vertical board PORTION OF...
  • Page 87 Phillips-head screw (see Figure 5-8). Remove the four screws that secure the Vertical board to the 442 chassis. (Refer to Figure 5-8 for location of screws and board assemblies.) To re-install the attenuator assemblies and the Channel 1 Shift board, reassemble in reverse of the foregoing order.

  • Page 88: Interface, Trigger Switch, Horizontal, And

    Remove the Phillips-head screw from the edge of the board toward the front of the 442 (see Figure 5-8 for location of these items). To reinstall the Horizontal Output board, reverse the order of the foregoing procedure.

  • Page 89: Access Position

    (U460) may retain a 10,000 volt preparing it for removal from the 442. Moving it to the charge after the 442 is turned off. To avoid electrical access position also allows access for removal of the A12 shock, ground both the output terminal of U460 and Horizontal board.
  • Page 90 Timing Horizontal board; then lift the Trigger board board. toward the back of the 442 so the switch knobs clear the front panel openings. Use an Allen wrench to disconnect the SEC/DIV...
  • Page 91 442; then tilt the neck support bracket toward along with the crt and shield assembly in the the bottom of the 442 and tilt the crt faceplate end following steps. of the shield toward the top of the 442. Next, slide...

  • Page 92: And Connectors

    Test Semiconductors. a. TEKTRONIX 576 Curve ures reverse breakdown Tracer. voltages up to at least 400 V. b. TEKTRONIX 577 (D1 or D2) Curve Tracer with 177 Test Fixture 2. Test Oscilloscope with Frequency response, dc to Check operating wave­...

  • Page 93: Section 6 Replaceable Electrical Parts

    If a part you have ordered has been replaced with a new or improved part, your local Tektronix, Inc. Field Office or representative will contact you concerning any change in part number.
  • Page 94 Replaceable Electrical Parts—442 Service CROSS IN D E X -M F R . CODE NUMBER TO MANUFACTURER City, State, Zip M fr. Code Manufacturer Address CHATSWORTH, CA 91311 000DN FUSES UNLIMITED 9740 COZYCRAFT AVENUE 00213 NYTRONICS, COMPONENTS GROUP, INC., ORANGE STREET DARLINGTON, SC 29532 SUBSIDIARY OF NYTRONICS, INC.
  • Page 95 Replaceable Electrical Parts—442 Service Serial/Model No. Tektronix Dscont Code Mfr Part Number Ckt No. Part No. Name & Description BO 11417 CKT BOARD ASSY:INTERFACE 670-5349-00 B010100 80009 670-5349-00 CKT BOARD ASSY:INTERFACE 670-5349-01 B011418 80009 670-5349-01 B021816 CKT BOARD ASSY:POWER SUPPLY...
  • Page 96 Replaceable Electrical Parts—442 Service M f r S e r i a i / M o d e l N o . T e k t r o n i x C o d e M f r Part N u m b e r...
  • Page 97 Replaceable Electrical Parts—442 Service Tektronix Serial/Model No. Ckt No. Part No. Dscont Name & Description Code Mfr Part Number CAP. ,FXD,CER D1:0.1UF,20%,50V 281-0775-00 C2327 72982 8005D9AABZ5U104M 290-0480-00 CAP. ,FXD,ELCTLT:0.5UF,+50-10%,200V C2337 80009 290-0480-00 CAP. ,FXD,CER DI:2UF,20%,50V C2398 283-0212-00 72982 8141N064Z5U205M CAP. ,FXD,CER DI:2UF,20%,50V...
  • Page 98 Replaceable Electrical Parts—442 Service Tektronix Serial/Model No. E f t Dscont Name & Description Part No. Code Mfr Part Number Ckt No. 281-0773-00 CAP.,FXD,CER DI:0.01UF,10%,100V C4331 72982 8005H9AADW5R103K CAP.,FXD,CER DI:0.01UF,10%,100V 281-0773-00 C4332 72982 8005H9AADW5R103K CAP., FXD,CER DI:0.01UF,10%,100V 281-0773-00 72982 C4334...
  • Page 99 Replaceable Electrical Parts—442 Service Serial Model No. Tektronix Code Name & Description Mfr Part Number Dscont Ckt No. Part No. SEMICOND DEVICE: SILICON,30V,50NA 01295 XB010409 1N4152R CR2025 152-0141-02 SEMICOND DEVICE:SILICON,30V,50NA 01295 1N4152R CR2032 152-0141-02 SEMICOND DEVICE:SILICON,30V, 50NA 01295 1N4152R CR2036...
  • Page 100 Replaceable Electrical Parts—442 Service Tektronix Serial/Model No. Code Mfr Part Number Name Description Ckt No. Part No. Dscont & J2250 05574 131-1801-00 CONNECTOR,RCPT,:9 CONTACTS 000201-4832 J2260 131-1802-00 CONNECTOR,RCPT,:15 CONTACTS 05574 000201-4831 J4200 131-2116-00 CONN,RCPT,ELEC:FD-THRU,12 MALE,GOLD PLATED 27264 09-70-1129 108-0819-00 COIL,TUBE DEFLE: X-Y ALIGNMENT...
  • Page 101 Replaceable Electrical Parts—442 Service Tektronix Serial/Model No. Code Mfr Part Number Dscont Name & Description Ckt No. Part No. TRANSISTOR:SILICON,PNP 04713 SPS6868K Q2332 151-0188-00 Q2334 151-0124-00 TRANSISTOR:SILICON, NPN,SEL FROM 2N3501 04713 SM8138 151-0124-00 TRANSISTOR:SILICON,NPN,SEL FROM 2N3501 04713 SM8138 Q2344 TRANSISTOR:SILICON,NPN...
  • Page 102 Replaceable Electrical Parts—442 Service Tektronix Serial/Model No. Ckt No. Part No. Dscont Name & Description Code Mfr Part Number R413 315-0102-00 01121 CB1025 R414 315-0332-00 01121 CB3325 R4I6 315-0302-00 RES. 01121 CB3025 R417 315-0752-00 RES, 01121 CB7525 R419 315-0103-00 RES,...
  • Page 103 Replaceable Electrical Parts—442 Service Serial/Model No. Tektronix Mfr Part Number Dscont Name & Description Code Ckt No. Part No. R757 321-0671-00 RES.,FXD,FILM:8.51K OHM,0.5%,0.125W 24546 NC55C851 ID R762 RES.,FXD,CMPSN 560 OHM,5%,0.25W 01121 315-0561-00 CB5615 R763 315-0182-00 RES.,FXD,CMPSN:1.8K 0HM,5%,0.25W 01121 CB1825 B010849 RES., FXD,FILM...
  • Page 104 Replaceable Electrical Parts—442 Service Tektronix Serial/Model No. Mir Part Number Code Dscont Name Description Ckt No. Part No. & R2060 321-0149-00 RES. , , FXD,FILM:348 OHM,1%,0.125W 91637 MFF1816G348R0F R2061 321-0068-00 RES. , FXD,FILM:49.9 OHM,1%,0.125W 91637 MFF1816G49R90F R2062 311-1565-00 RES. , VAR,NONWIR:250 OHM,20%,0.50W...
  • Page 105 Replaceable Electrical Parts—442 Service Tektronix Serial/Model No. Ckt No. Part No. Dscont Name & Description Code Mfr Part Number R2233 315-0122-00 RES. , FXD, CMPSN:1.2K OHM,5%,0.25W 01121 CB1225 R2235 315-0681-00 RES. , FXD, CMPSN:680 OHM,5%,0.25W 01121 CB6815 R2236 315-0680-00 RES. , FXD, CMPSN:68 OHM,5%,0.25W...
  • Page 106 Replaceable Electrical Parts—442 Service Tektronix Serial/Model No. Ckt No. Part No. Dscont Name & Description Code Mfr Part Number RES. , FXD,CMPSN:1.8K OHM,5%,0.25W 01121 CB1825 R2356 315-0182-00 01121 CB7525 R2357 315-0752-00 RES. , FXD,CMPSN:7.5K OHM,5%,0.25W RES. , FXD,CMPSN:24 OHM,5%,0.50W 01121...
  • Page 107 Replaceable Electrical Parts—442 Service M fr S e r i a l/Model No. Tektronix M f r Part N u m b e r N a m e & Description C o d e D s c o n t C k t No.
  • Page 108 Replaceable Electrical Parts—442 Service Tektronix Serial/Model No. Name Description Mfr Part Number Dscont Code Ckt No. Part No. & RES. , FXD,FILM:1.96K OHM,1%,0.125W MFF1816G19600F R4267 321-0221-00 B010409 91637 RES. , FXD,CMPSN:750 OHM,5%,0.25W 01121 CB7515 R4268 315-0751-00 RES. , FXD,FILM:825 OHM,1%,0.125W...
  • Page 109 Replaceable Electrical Parts—442 Service Tektronix Serial/Model No. Ckt No. Part No. Dscont Name Description Code Mfr Part Number & R4349 315-0621-00 RES.,FXD,CMPSN:620 OHM,52,0.25W CB6215 01121 R4350 321-0207-00 RES.,FXD,FILM:1.4K OHM,12,0.125W MFF1816G14000F 91637 R4351 315-0101-00 RES. , FXD,CMPSN: 100 OHM,5%,0.25W CB1015 01121...
  • Page 110 Replaceable Electrical Parts—442 Service Tektronix Serial/Model No. Ckt No. Part No. Dscont Code Mfr Part Number Name Description & T700 120-0994-02 XFMR,PWR,STPDN: 80009 120-0994-02 B010100 BO 10119 MICROCIRCUIT,LI:OPERATIONAL AMPLIFIER 02735 CA741CG 156-0067-11 156-0067-12 B010120 BO 11417 MICROCIRCUIT, LI: OPERATIONAL AMPLIFIER...
  • Page 111 Values less than one are in microfarads Other ANSI standards that are used in the preparation (A*F). of diagrams by Tektronix, Inc. are: Resistors = Ohms (O). The information and special symbols below may appear in this manual. Assembly Numbers and Grid Coordinates The schematic diagram and circuit board component location illustration have grids.
  • Page 112 442 Service CH 1 ATTENUATOR F R O N T ASSEMBLY S 4100 S 4200 T" (Board Inside) © CM ^ ° R 4 1 0 4 R 4204 © © CH 2 § S CM CM ATTENUATOR ° ASSEMBLY...

  • Page 113: Oscilloscope Block Diagram

    Figure 7-4. 442 Oscilloscope block diagram. REV A JUN 1980 2 3 7 4 - 2 7 A...

  • Page 114: A8-Vertical Circuit Board Component Locations

    442 Service d e l a y l i n e LIGHT WIRE P4336 CR4332 CR4335 d e l a y l in e CR4336 CR4331 DARK WIRE R4195 R4335 o> £2 04196 e*. c m Q4302 co 9, . ©; © r-...
  • Page 115 GRID GRID GRID GRID C4122 J4100-3 2F R4177 R4318 J4100-4 2F C4131 R4178 R4321 J4200-1 C4155* R4179 R4322 J4200-2 4F R4181 C4156 R4324 J4200-3 4F R4182 C4158 R4325 J4200-4 4F R4183 C4166 R4331 R4184 C4168 R4332 R4186 C4177 P4336 R4334 FRONT C4187 P4346...
  • Page 116 C K T G R ID C K T G R ID G R ID C K T G R ID L O G L O O L O O L O O C 4 1 2 2 J 4 1 0 0 -3 R 4177 R 4318 J410Q -4...
  • Page 117 VERTICAL BOARD Figure 7-6. Vertical circu it board location.
  • Page 119 A 50 kHz, 100 mV sine wave was applied to the Channel 1 input and a 50 kHz, 2 V square wave was applied to the Channel 2 input. A Tektronix SG 503 provided the sine wave and a Tektronix FG 502 pro­...
  • Page 121 442 Service F ■ PI 38 C119 C124 R455 C445 P470 Q136 C115 R462 C l 13 r&o R446 R115 C114 R445 tote 0134 « <0 <0 CR443 ® Q112 ■ Q446 Q454 R453 £S R114 C443 P475 R447 R474 ■...
  • Page 123 Figure interface circu it board location. 7 -8.
  • Page 125 A 50 kHz, 100 mV sine wave was applied to the Channel 1 input and a 50 kHz, 2 V square wave was ap­ plied to the Channel 2 input. A Tektronix SG 503 provided the sine wave and a Tektronix FG 502 provided the square wave.
  • Page 127 442 Service X-Y GAIN FRONT g S 5 g g ° g g g R 2 0 6 2 S2030 o o o o 2 °« < o o > CO e o S ft® > e»CM CM O CM CM...
  • Page 128 GRID GRID GRID GRID GRID CR2005 ID C2001 R2006 RT2061 R2035 C2005 CR2006 ID R2007 R2036 CR2024 IF C2010 S2010 R2008t R2037 C2011 CR2025 1G R2010 R2038 S2030t CR2032 IF C2013 R2011 S2050t R2039 CR2036 IE C2014 R2013 R2048 CR2063 1H C2019 R2014 R2049...
  • Page 129 GRID G R ID C K T C K T G R ID C K T C K T C K T G R ID G R ID L O C L O C L O C L O C R2O0S R T2061 C 2001...
  • Page 130 A l l TRIGGER SWITCH BOARD 2 3 7 4 - 3 6 A Figure 7-10. Trigger Switch circu it board location.
  • Page 131 2 3 , 7 4 - S 4 V E R T IC A L OUT PUT, CRT t PROBE AD J <3> VRSO...
  • Page 132 A 50 kHz, 100 mV sine wave was applied to the Channel 1 input and a 50 kHz, 2 V square wave was ap­ plied to the Channel 2 input. A Tektronix SG 503 provided the sine wave and a Tektronix FG 502 provided the square wave.
  • Page 134 o > P2330 R2324 R2313 R2327 CR2326 R2326 R2315 R2317 CR2332 CR2331 R2182 GR2181 C2181 CR2183 R2314 3D 30 3D 3D 30 3D 30 ,tO to to to to to to ;tO r tO JO IOcto to oimcn cn oi (n O ) ®...
  • Page 135 GRID GRID GRID GRID C2123 P2200 R2151 R2278 C2124 P2270 R2152 R2310 C2125 P2310 R2153 R2311 C2128 P2312 R2154 R2313 C2144 P2330 R2156 R2314 C2149 R2157 R2315 C2156 Q2122 R2158 R2316 C2162 Q2124 R2162 R2317 C2163 Q2128 R2163 R2321 C2166 Q2134 R2322 R2164...
  • Page 136 TIMING BOARD (SEC/DIV Switch- BOARD Figure 7-12. Horizontal circuit board location. Static Sensitive Devices See M aintenan ce Section *See Parts List for serial number ranges, flncorrect marking on some boards, see R2164.
  • Page 138 A 50 kHz, 100 mV sine wave was applied to the Channel 1 input and a 50 kHz, 2 V square wave was ap­ plied to the Channel 2 input. A Tektronix SG 503 provided the sine wave and a Tektronix FG 502 provided the square wave.
  • Page 140 4 4 Z...
  • Page 141 A 50 kHz, 100 mV sine wave was applied to the Channel 1 input and a 50 kHz, 2 V square wave was applied to the Channel 2 input. A Tektronix SG 503 provided the sine wave and a Tektronix FG 502 provided the square wave.
  • Page 143 + IOOV C 2 3 3 7 + 8V + IOOV • R 2 3 5 5 < R 2 3 3 7 R 2 3 3 5 • SK > 7 5 K R 2 3 5 2 > R P 3 S 4 -- W V --- - - W v ---...
  • Page 144 442 Service Figure 7-13. A14—Horizontal Output circuit board component locations. GRID GRID C2337 R2331 R2332 C2398f R2333 C2399t R2334 CR2334 2C R2335 CR2342 2B R2336 FIGURE CR2356 2A 7-14 R2337 R2342 P2332 R2344 P2334 R2345 P2344 R2347 R2352 Q2332 R2353...
  • Page 145 HORIZONTAL OUTPUT 2 3 7 4 - 4 0 A BOARD Figure 7-14. Horizontal Output circuit board locations.
  • Page 146 442 Service POWER SUPPLY 2 3 7 4 - 4 2 A BOARD Figure 7-16. Power Supply circuit board location. GRID GRID GRID GRID GRID Q726 R746 T700$ C722t CR737 0734 C723* CR738 R747 C738 0736$ R752 U742 CR741 Q752...
  • Page 147 VO LTAG E CO NDITIO NS Voltages shown on this schematic diagram were measured w ith a Tektronix DM 502A Digital Multimeter. Voltage measurements can vary as much as ±20%. No signals were applied to the vertical input or to EXT-...
  • Page 148 R.EV K J U N \9SO...
  • Page 149 L E V E L C O M P A R A T O R C H E C K A N D S C H M IT T C R T T R IG G E R C IR C U IT S Figure 7-17. 442 Oscilloscope troubleshooting chart. @ JUN 1980...

  • Page 150: Section 8 Replaceable Mechanical Parts

    If a part you have ordered has been replaced with a new or Parts of Detail Part improved part, your local Tektronix, Inc. Field Office or Attaching parts for Parts of Detail Part representative will contact you concerning any change in part number.
  • Page 151 Replaceable Mechanical Parts—442 Service CROSS I N D E X - M F R . CODE NUMBER TO MANUFACTURER City, State, Zip Address M fr. Code Manufacturer SANTA FE SPRINGS, CA 90670 OOOAH STANDARD PRESSED STEEL CO., UNBRAKO DIV. 8535 DICE ROAD...
  • Page 152 Replaceable Mechanical Parts—442 Service Fig. & Index Tektronix Serial/Model No. Part No. Dscont Qty 1 2 3 4 5 Name & Description Code Mtr Part Number 1 COVER,SCOPE:FRONT 80009 200-1203-00 200-1203-00 (STANDARD ACCESSORY) 200-0602-00 200-0602-00 2 COVER,HDL LATCH:2.12 DIA X 0.7,ACETAL...
  • Page 154 REV. A DEC 1978...
  • Page 155 Replaceable Mechanical Parts—442 Service Fig. & Index Tektronix Serial/Model No. M fr Part No. Dscont Qty 1 2 3 4 5 Name & Description Code Mfr Part Number 366-1031-02 366-1031-02 K N O B :RED,VAR,0 .127ID X 0.392 OD 80009 213-0246-00 .
  • Page 156 Replaceable Mechanical Parts—442 Service Fig. & Tektronix Serial/Model No. Index Mfr Part Number Part No. Dscont Qty 1 2 3 4 5 Name & Description Code 1 CKT BOARD ASSY:INTERFACE 80009 672-0689-00 672-0689-00 (ATTACHING PARTS) 1 SCREW,MACHINE:6-32 X 0.312 INCH.PNH STL...
  • Page 157 Replaceable Mechanical Parts—442 Service Fig. & M fr Index Tektronix Serial/Model N o. Mfr Part Number Part No. Dscont Qty 1 2 3 4 5 Name & Description Code 47357 2 -80 131-0608-00 . . . TERMINAL,PIN:0.365 L X 0.025 PH BRZ GOLD 22526 .
  • Page 158 Replaceable Mechanical Parts—442 Service Fig. & Index Tektronix Serial/Model No. Mfr Part Number Dscont Qty 1 2 3 4 5 Name & Description Code Part No. 80009 386-3811-00 2-125 386-3811-00 SUBPANEL,REAR: (ATTACHING PARTS) 83385 SCREW,MACHINE:8-32 X 0.375 100 DEG.FLH STL...
  • Page 159 Replaceable Mechanical Parts—442 Service Fig. & Tektronix Serial/Model N o. M fr Index Dscont Qty 1 2 3 4 5 Name & Description Code N o. Part No. M fr Part Number 352-0497-00 3 HOLDER,CKT CD: 2 -160 80009 352-0497-00 210-0273-00 XB010160 1 TERMINAL,LUG:0.781 INCH LONG...
  • Page 160 Replaceable Mechanical Parts—442 Service Fig. & Index Tektronix Serial/Model No. M fr Part No. Dscont Qty 1 2 3 4 5 Name Description Code Mfr Part Number & 3 -1 366-1559-00 5 PUSH BUTTON:SIL GY,0.18 SQ X 0.43 80009 366-1559-00...
  • Page 161 Replaceable Mechanical Parts—442 Service F i g . & M f r I n d e x T e k t r o n i x S e r i a l / M o d e l N o .
  • Page 162 Replaceable Mechanical Parts—442 Service Fig. & Index Tektroni x S er i a l / Model No. Code Mfr Part Number Dscont Qty 1 2 3 4 5 Name Description Part No. & . . CONNECTOR,TERM.:22-26 AWG.BRS& CU BE GOLD...
  • Page 163 Fig. & Index T e k t r o n i x S e r i a l / M o d e l No. Mf r Part No. Dscont 1 2 3 4 5 Na me & De s c r i p t i o n Code Mf r Part N u 0 1 0 - 6 1 0 8 - 0 3...
  • Page 165 MANUAL CHANGE INFORMATION At Tektronix, we continually strive to keep up with latest electronic developments by adding circuit and component improvements to our instruments as soon as they are developed and tested. Sometimes, due to printing and shipping requirements, we can’t get these changes immediately into printed manuals.
  • Page 166 CALIBRATION TEST EQUIPMENT REPLACEMENT Calibration Test Equipment Chart This chart compares TM 500 product performance to that of older Tektronix equipment. Only those characteristics where significant specification differences occur, are listed. In some cases the new instrument may not be a total functional replacement. Additional support instrumentation may be needed or a change in calibration procedure may be necessary.
  • Page 167 7-18-80_______ M37963 c o m it t e d t o e x c e l le n c e Product: Manual Part No.: 442 SERVICE EFF SN B023856-UP__________ 070-2374-01 DESCRIPTION REPLACEABLE ELECTRICAL PARTS AND SCHEMATIC CHANGES CHANGE TO: 670-5247-03...
  • Page 168 Change Reference: Date:_____4-2-81_______ M43083_____ c o m it t e d e x c e l le n c e Manual Part N o .: Product: 442 SERVICE SN B024696-UP_______________ ____070-2374-01 DESCRIPTION TEXT CHANGES SECTION 5 Last page ADD: Selectable Components Selecting R463 (values between 680KT2 and 2 Mft) and R469 (values between 1 and 10 Mfi) .
  • Page 169 Produce 442 SERVICE_________________ Date: 4- 2~81 Change Reference: M43083 D E S C R I P T I O N appears, then repeat steps 1 and 2. If intensity modulation is now eliminated, permanently install the new value of R463. If intensity modulation is noted, install the next higher nominal value for R463, repeat steps 1 and 2, and if intensity modulation is now OK, permanently install the latest R463 value.
  • Page 170 Tektronix MANUAL c h a n g e in f o r m a t io n Date: 10-16-80______ Change Reference: M41860 c o m u t e d t o e x c e l le n c e EFF SN B024470 •...

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