Tektronix 7623A Manuale utente

COMMITIED

EXCELLENCE

WARNING

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.

PLEASECHECK FOR CHANGE INFORMATION

AT THE

REAR

OF THIS MANUAL.

STORAGE

OSCILLOSCOPE

WITH

OPTIONS

SERVICE

INSTRUCTION

MANUAL

Tektronix,

Inc.

P.O. Box 500

Beaverton, Oregon 97077

070-1685-00

Product Group 42

Scans

ARTEK

MEDU

Serial

Number

First Printing

MAY

1974

Revised

APR 1984

DIGITALY REMASTERED

OUT OF PRINT- MANUAL SCAN

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Contents of this publicationmay not be reproduced in any

form without the written permission of Tektronix, Inc.

Productsof Tektronix, Inc. and its subsidiaries are covered

by U.S. and foreign patents and/or pending patents.

TEKTRONIX, TEK, SCOPE-MOBILE, and

are

registered trademarks of Tektronix, Inc. TELEQUIPMENT

is a registered trademark of Tektronix U.K. Limited.

Printed in U.S.A. Specification and price change privileges

are reserved.

INSTRUMENT SERIAL NUMBERS

Each instrument has a serial number on a panel insert, tag,

or stamped on the chassis. The first number or letter

designates the country of manufacture. The last five digits

of the serial number are assigned sequentially and are

unique to each instrument. Those manufactured in the

United States have six unique digits. The country of

manufacture is identified as follows:

6000000 Tektronix, Inc., Beaverton, Oregon, USA

100000 Tektronix Guernsey, Ltd., Channel Islands

200000 Tektronix United Kingdom, Ltd., London

300000 SonyPTektronix,Japan

700000 Tektronix Holland, NV, Heerenveen,

The Netherlands

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7623A/R7623A Service

TABLE

CONTENTS

LlSTOF

LLUSTRATlONS

LlSTOF TABLES

SECTION

OPERATING INFORMATION

PRELIMINARY OPERATION

AC POWER SOURCES

AC POWER CORD

OPERATING VOLTAGE

OPERATING TEMPERATURE

RACKMOUNTING

PLUG-IN UNITS

PLUG-ININSTALLATIONAND REMOVAL

CONTROLS AND CONNECTORS

FRONT PANEL CONTROLS AND CONNECTORS

REAR PANEL CONTROLSAND CONNECTORS

GENERAL OPERATING INFORMATION

INTENSITY CONTROL

DISPLAY FOCUS

GRATICULE

LIGHT FILTER

BEAMFINDER

READOUTMODES

DISPLAY PHOTOGRAPHY

STORAGE

CARE OF STORAGE SCREEN

VERTICAL MODE

TRIGGER SOURCE

X-Y OPERATION

INTENSITY MODULATION

RASTER DISPLAY

CALIBRATOR

SIGNALS OUT

APPLICATIONS

SECTION

SPEC1FICATIONS

INTRODUCTION

STANDARD ACCESSORIES

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TABLE

CONTENTS

(cont.)

SECTION

THEORY OF OPERATION

LOGIC FUNDAMENTALS

SYMBOLS

LOGICPOLARITY

INPUTIOUTPUTTABLES

NON DIGITALDEVICES

BLOCK DIAGRAM

THEORY OF OPERATION

MAIN INTERFACE

LOGIC CIRCUIT

Z-AXIS LOGIC

CLOCK GENERATOR

VERTICAL CHOPPED BLANKING

CHOP COUNTER

VERTICAL MODE CONTROL

VERTICAL BINARY

PLUG-INBINARY

OUTPUT BUFFERS

TRIGGER SELECTOR

TRIGGER MODE AND ADD SIGNALS

TRIGGER CHANNELSWITCH

TRIGGER OUTPUT AMPLIFIER

VERTICALSIGNAL BUFFER

VERTICAL INTERFACE

VERTICAL CHANNEL SWITCH

AUXILIARY Y-AXIS INPUTAMPLIFIER

DELAY-LINE BUFFER

DELAY LINE

VERTICAL AMPLIFIER

CENTERING AND READOUT AMPLIFIER

INPUTAMPLIFIER

BEAMFINDER NETWORK

OUTPUT AMPLIFIER

HORIZONTAL AMPLIFIER

HORIZONTAL CHANNEL SWITCH

RIGHT OUTPUT AMPLlFlER

LEFT OUTPUT AMPLIFIER

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TABLE OF CONTENTS

(cont.)

OUTPUT SIGNALS

VERT SIG OUT

GATE OUT

SAWTOOTH OUT

CRT CIRCUIT

HIGHVOLTAGE REGULATION

AUTO FOCUS DC RESTORER

AUTO FOCUS

CONTROL GRID DC RESTORER

Z-AXISAMPLIFIER

CRT CONTROL CIRCUITS

LOW-VOLTAGEPOWER SUPPLY

POWER INPUT

-50-VOLT SUPPLY

-15-VOLT SUPPLY

+5-VOLT SUPPLY

+15-VOLT SUPPLY

+50-VOLT SUPPLY

+130-VOLTSUPPLY

GRATICULE LIGHT SUPPLY

CALIBRATOR

READOUT SYSTEM

INTRODUCTION

THREE-COMPARTMENTMAINFRAMES

DISPLAY FORMAT

DEVELOPINGTHE DISPLAY

TIMER

TIME-SLOTCOUNTER

WORD TRIGGER

CHANNELCOUNTER

READOUT CONTROL

SINGLE-SHOT LOCKOUT

ENCODINGTHE DATA

COLUMN AND ROW DATASWITCHES

DISPLAY-SKIPGENERATOR

COLUMN AND ROW DECODERS

ZEROS LOGICAND MEMORY

iii

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TABLE

CONTENTS

(cont.)

CHARACTER GENERATORS 3-64

DECIMAL POINT LOGICAND CHARACTER POSITION COUNTER3-64

FORMAT GENERATOR 3-65

Y-OUTPUTAMPLlFlER 3-67

X-OUTPUTAMPLlFlER 3-67

DISPLAY SEQUENCE 3-67

STORAGE SYSTEM

3-68

LOG

C 3-68

OPERATIONAL AMPLIFIERS 3-73

SECTION

MAINTENANCE

PRELIMINARY INFORMATION

PANEL REMOVAL

POWER UNIT REMOVAL

PREVENTIVE MAINTENANCE

CLEANING

LUBRICATION

VISUAL INSPECTION

SEMICONDUCTOR CHECKS

RECALIBRATION

TROUBLESHOOTING

TROUBLESHOOTING AIDS

TROUBLESHOOTING EQUIPMENT

TROUBLESHOOTINGTECHNIQUES

CORRECTIVE MAINTENANCE

OBTAINING REPLACEMENTPARTS

SOLDERINGTECHNIQUES

COMPONENT REPLACEMENT

SEMICONDUCTOR REPLACEMENT

CATHODE-RAYTUBE REPLACEMENT

SWITCH REPLACEMENT

GRATICULE-BULB REPLACEMENT

POWER TRANSFORMER REPLACEMENT

HIGHVOLTAGE COMPARTMENT

FUSE REPLACEMENT

RECALIBRATIONAFTER REPAIR

INSTRUMENTREPACKAGING

SELECTED COMPONENT CRITERIA

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1983

7623AlR7623A Service

TABLE OF CONTENTS

(cont.)

SECTION

PERFORMANCE CHECKICALIBRATION

PRELIMINARY INFORMATION

CALIBRATION INTERVAL

TEKTRONIX FIELD SERVICE

USING THIS PROCEDURE

TEST EQUIPMENT REQUIRED

SPECIAL CALIBRATION FIXTURES

CALIBRATION EQUIPMENTALTERNATIVES

SIGNAL CONNECTIONS

WARM-UPAND TEMPERATURE REQUIREMENTS

PART I-PERFORMANCE CHECK

INTRODUCTION

OUTLINE FOR PART I-PERFORMANCE CHECK

PART II-CALIBRATION

INTRODUCTION

OUTLINE FOR PART II-CALIBRATION

SECTION

OPTIONS

SECTION

ELECTRICAL PARTS LIST

SECTION

DIAGRAMS

SECTION

MECHANICAL PARTS LIST

CHANGE INFORMATION

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LIST OF ILLUSTRATIONS

PAGE

Frontispiece

Figure 1-1. Location of voltage-selectorjumper.

Figure1-2. Front panel controls and connectors.

Figure 1-3. Rear panel controls and connectors.

Figure 1-4. Definitionof measurementlinesonthe graticule.

Figure 1-5. Location of Readout Modeswitch.

Figure 1-6. Location of Calibratorjumper on Storagecircuit board.

Figure3-1. Block diagram 7623A.

Figure3-2. Logic circuit block diagram.

Figure3-3. 2-Axis logic block diagram.

Figure3-4. (A)Clock Generator stage of U55A. (B)ldealizedwaveforms from Clock

Generator stage.

Figure3-5. (A) lnput and output pinsfor Vertical Chopped Blankingstage. (B) ldealized

waveformsfor Vertical Chopped Blankingstage.

Figure3-6. (A) Logicdiagramfor Vertical Chopped Blankingstage. (B)Table of input/output

combinationsfor Vertical Chopped Blankingstage.

Figure3-7. Detailedlogicdiagram of Chop Counter stage.

Figure 3-8. ldealized inputand output waveforms for Chop Counter stage

Figure 3-9. Logic diagramof Vertical ModeControl and Vertical Mode Buffer Amplifier

stages.

Figure 3-10. Logic diagramof Vertical Binary stage.

Figure3-11. ldealizedwaveforms showing relationshipbetween input and output waveforms

for Vertical Binary and Plug-InBinary stages when operating inALT mode.

Figure3-12. Logic diagram of Plug-InBinary and Plug-InAlternate Buffer stage.

Figure3-13. Detailed block diagram of Trigger Selector circuit along with simplified diagram

of trigger source selection circuitry.

Figure3-14. lnput levelsat pin4 of U324.

Figure3-15.

nputloutput table for Trigger Channel Switch stage.

Figure 3-16. Vertical Interfacedetailed block diagram.

Figure 3-17. Input/output table for Vertical Channel Switch.

Figure3-18. Vertical Amplifier detailed block diagram.

Figure3-19. Horizontal Amplifier detailed block diagram.

Figure3-20. CRT circuit detailed block diagram.

Figure3-21. Low-VoltagePower Supply detailed block diagram.

Figure3-22. Schematic illustrating voltage drop betweenpower supply output and load due

to resistance of interconnectingwire.

Figure 3-23. Calibratordetailed block diagram.

Figure3-24. Location of readoutwords on the crt identifyingthe originatingplug-inunit

and channel (onecomplete frame shown).

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LIST

ILLUSTRATIONS

(cont.)

Figure 3-25. Character SelectionMatrix for 7623A Readout System.

Figure 3-26. Typical readoutdisplay where only channel

of the Right Vertical and

Horizontal units

displayed.

Figure3-27. Detailed block diagram of the ReadoutSystem.

Figure3-28. Output waveforms of Timer stage.

Figure 3-29. Detailof output at pins 12, 13, 14, and 16 of U2126.

Figure3-30. Timer stage operationwhen Display-Skipcondition occurs.

Figure3-31. Time relationshipof the time-slot (TS)pulses producedby U2159.

Figure 3-32. Typical encoding scheme for voltage-sensingamplifier plug-inunit. Coding

shownfor deflection factor of 100microvolts.

Figure3-33. Idealizedcurrent waveforms of: (A)Row analog data, (6)Columnanalog data.

Figure 3-34. Block representationof memory sequence inU2232.

Figure 3-35. Typical output waveformsfor Zeros Logic and Memory stage operation(atpin

7 of U2232).

Figure3-36. Readout word relating10possiblecharacter locationsto the decimal point

instructionsthat can be encoded, and the resultantcrt display.

Figure 3-37. Flow chart for character generation by the Readout System.

Figure3-38. Storage circuit simplified block diagram.

Figure 3-39. Time relationshipof Storage logic pulses.

Figure 3-40. BISTABLE modeStorage waveforms.

Figure3-41. VAR PERSIST mode Storage waveforms.

Figure3-42. FAST BISTABLE mode Storage waveforms.

Figure3-43. FAST VAR PERSIST modeStorage waveforms.

Figure4-1. Power Unit removal.

Figure4-2. Location of circuit boards inthe 7623A.

Figure4-3. Location of circuit boards inthe R7623A.

Figure4-4. Circuit isolation troubleshootingchart.

Figure4-5. Location of screws holding Low Voltage sub-chassis.

Figure4-6. Location of screws holdingSignals Out rear panel.

Figure 5-1. Typical crtdisplay when checking

X-Y

phase shift.

Figure5-2. Location of Calibrator ACIDC jumper.

Figure5-3. Location of High-VoltageTest Point.

Figure5-4. Location of adjustments in High-Voltagecover.

Figure5-5. Typical crt display when checking

X-Y

phase shift.

Figure5-6. Location of CalibratorACIDC jumper.

PAGE

Section8 figuresare located near their associateddiagrams on the foldout pages.

REV

B MAR

1980

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vii

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