Service Manuals, User Guides, Schematic Diagrams or docs for : Tektronix 7b87_sm
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COMMITTED TO EXCELLENCE
CHECK FOR CHANGE INFORMATION
REAR O THIS MANUAL.
UIRE CLOCK
TI ON MANUAL
Tektronix, Inc .
P.O . Box 500
Beaverton, Oregon 97077 Serial Number
070-2788-00 First Printing APR 1980
Product Group 42 Revised JAN 1986
Copyright Ll~ 1980 Tektronix, Inc. All rights reserved .
Contents of this publication may not be reproduced in any
form without the written permission of Tektronix, Inc .
Products of Tektronix, Inc. and its subsidiaries are covered
by U .S . and foreign patents and/or pending patents .
TEKTRONIX, TEK, SCOPE-MOBILE, and 19!!44 are
registered trademarks of "Tektronix, Inc . TELEOUIPMENT
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 parlel 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 :
13000000 "Tektronix, Inc., Beaverton, Oregon, USA
100000 Tektronix Guernsey, Ltd ., Channel Islands
200000 Tektronix United Kingdom, Ltd ., London
300000 Sony/Tektronix, Japan
700000 Tektronix Holland, NV, Heerenveen,
The Netherlands
71387 Instruction
PAGE PAGE
LIST OF ILLUSTRATIONS . . . . . . . . . . .. . .. . .. . ... .. . .. . . .. . . iii DETAILED CIRCUIT DESCRIPTION . . . . . . . . . . . . . . . . . . . . . 3-1
LIST OF TABLES . . . . . . . . . . . . . . . . . . . .. .. . .. . . .. . .. . .. . .. . . iv FRONT-PANEL DISTRIBUTION . . . . . . . . . . . . . . . . . . . . . 3-3
OPERATORS SAFETY SUMMARY . . ... .. . .. . ... ... .. . . .. . . .v TRIGGER GENERATOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
SERVICING SAFETY SUMMARY . . . . .. . .. . .. . ... .. . ... . .. . vii EXTERNAL SOURCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
INTERNAL AND LINE SOURCE . . . . . . . . . . . . . . . . . . 3-3
TRIGGER SOURCE SELECTOR AND
SECTION 1----OPERATING INSTRUCTIONS AMPLIFIER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 PEAK-TO-PEAK AUTO . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
CONTROLS, CONNECTORS, AND INDICATORS . . . . . . 1-1 SLOPE SELECTOR AND TRIGGER
FUNCTIONAL CHECK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 GENERATOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
SETUP PROCEDURE . . . . . . . . . . . . . . . . . . . . . . . . . . ., 1-1 GATE GENERATOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
SWEEP FUNCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4 LOGIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
TRIGGERING FUNCTIONS . . . . . . . . . . . . . . . . . . . . . . 1-4 SWEEP MODES . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . 3-5
PRETRIGGER ACQUIRE CLOCK FUNCTIONS . . . . . 1-5 HOLD OFF TIMING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
GENERAL OPERATING INFORMATION . . . . . . . . . . . . . . 1-6 LOCKOUT BUFFER AMPLIFIER . . . . . . . . . . . . . . . . . . 3-7
TRIGGERING SWITCH LOGIC . . . . . . . . . . . . . . . . . . . 1-6 HOLD OFF OUTPUT AMPLIFIER . . . . . . . . . . . . . . . . . 3-7
TRIGGERING MODES . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6 SWEEP GENERATOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
TRIGGER COUPLING . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9 TIMING CURRENT SOURCE . . . . . . . . . . . . . . . . . . . . . 3-7
TRIGGER SOURCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9 RAMP GENERATOR . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10
TRIGGER SLOPE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11 HORIZONTAL PREAMPLIFIER . . . . . . . . . . . . . . . . . . 3-10
TRIGGER LEVEL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11 SWEEP GATE GENERATOR . . . . . . . . . . . . . . . . . . . . 3-10
HORIZONTAL SWEEP RATES . . . . . . . . . . . . . . . . . . 1-11 DVM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10
TIME MEASUREMENT . . . . . . . . . . . . . . . . . . . . . . ., . 1-11 DELAY TIME COMPARATOR AND DELAY
SWEEP MAGNIFICATION . . . . . . . . . . . . . . . . . . . . . . 1-11 GATE GENERATOR . . . . . . . . . . . . . . . . . . . . . . . . 3-10
VARIABLE HOLD OFF . . . . . . . . . . . . . . . . . . . . . . . . . 1-12 DIGITAL VOLTMETER . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11
MAINFRAME OPERATING MODES . . . . . . . . . . . . . 1-12 DELAY COMPARISON VOLTAGE-TO-RAMP
APPLICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12 CONVERTER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12
TIME INTERVAL MEASUREMENTS . . . . . . . . . . . . . . . . 1-12 COMPARATOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12
PERIOD AND FREQUENCY MEASUREMENTS . . . 1-12 REFERENCE CURRENT SOURCE . . . . . . . . . . . . . . . 3-12
RISE-TIME AND FALL-TIME MEASUREMENTS . . 1-13 REFERENCE CURRENT INVERTER . . . . . . . . . . . . . . 3-12
PULSE WIDTH MEASUREMENTS . . . . . . . . . . . . . . . 1-14 COUNTER AND ENCODER . . . . . . . . . . . . . . . . . . . . . 3-12
CLOCK GENERATOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12
CONTROL LOGIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-13
SECTION 2--SPECIFICATION OSCILLATOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-13
STANDARD ACCESSORIES . . . . . . . . . . . . . . . . . . . . . . . . 2-4 FIRST DIVIDER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-15
X1-X10MULTIPL-EXER . . . . . . . . . . . ., . . . . .3-15
------------ DECADE DIVIDER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-15
WARNING INTERNAL CLOCK MULTIPLEXER . . . . . . . . . . . . . . 3-15
OUTPUT CLOCK MULTIPLEXER . . . . . . . . . . . . . . . . 3-15
THE REMAINING PORTION OF THIS TABLE OF CONTENTS INTENSIFY CIRCUIT . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-15
LISTS SERVICING INSTRUCTIONS . THESE SERVICING 71387 IN A HORIZ PLUG-IN COMPARTMENT . . . . . . . 3-16
INSTRUCTIONS ARE FOR USE BY QUALIFIED PERSONNEL IN] ERNAL BUTTON PRESSED . . . . . . . . . . . . . . . . . . 3-16
71387 IN B HORIZ PLUG-IN COMPARTMENT . . . . . . . 3-16
ONLY . T O AVOID ELECTRICAL SHOCK, DO NOT PERFORM
ANY SERVICING OTHER THAN THAT CALLED OUT IN THE INTERNAL BUTTON PRESSED . . . . . . . . . . . . . . . . . . 3-16
OPERATING INSTRUCTIONS UNLESS QUALIFIED TO DO TIME/DIVISION AND READOUT SWITCHING . . . . . . . 3-17
BASIC READOUT SYSTEM . . . . . . . . . . . . . . . . . . . . . 3-17
SO .
TIME/DIVISION READOUT . . . . . . . . . . . . . . . . . . . . . 3-17
ACQUIRE-STOP DELAY TIME READOUT . . . . . . . . 3-17
INTERFACE CONNECTIONS AND POWER
SECTION 3---THEORY OF OPERATION SUPPLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-17
BLOCK DIAGRAM DESCRIPTION . . . . . . . . . . .......... . . 3-1
TRIGGER GENERATOR . . . . . . . . . . . . . . . . .......... . . 3-1
SWEEP GENERATOR . . . . . . . . . . . . . . . . . . .......... . . 3-1 SEC'T'ION 4-MAINTENANCE
PICKOFF AMPLIFIER AND DELAY GATE PREVENTIVE MAINTENANCE . ... ... ............... . . . 4-1
GENERATOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1 CLEANING . . . . . . . . . . . . . . . . ... ... . . . . .. . .. . . . . . . . . . 4-1
LOGIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1 EXTERIOR . . . . . . . . . . . . . ... ... . . . . . . . . . . . . . .. . . . 4-1
DIGITAL VOLTMETER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1 INTERIOR . . . . . . . . . . . . . . ... ... .. . . . . . . . . . . . . . . . . 4,1
CLOCK GENERATOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1 SWITCH CONTACTS . . . . .. . ... ............... . . . 4-1
REV JUN 1981
71387 Instruction
PAGE PAGE
VISUAL INSPECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1 SECTION 5 .--.-PERFORMANCE CHECK AND
LUBRICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1 ADJUSTMENT
CAM SWITCH LUBRICATION . . . . . . . . . . . . . . . . . . . . 4-2 PRELIMINARY INFORMATION . . . . . . . . . . . . . . . . . . .. . . 5-1
SEMICONDUCTOR CHECKS . . . . . . . . . . . . . . . . . . . . . . . 4-2 ADJUSTMENT INTERVAL . . . . . . . . . . . . . . . . . . . .. . . 5-1
ADJUSTMENT AFTER REPAIR . . . . . . . . . . . . . . . . . . . . . 4-2 TEKTRONIX FIELD SERVICE . . . . . . . . . . . . . . . . . .. . . 5-1
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2 USING THIS PROCEDURE . . . . . . . . . . . . . . . . . . .. . . 5-1
TEST EQUIPMENT REQUIRED . . . . . . . . . . . . . . . . . . .. . . 5-1
TROUBLESHOOTING AIDS . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
SPECIAL FIXTURES . . . . . . . . . . . . . . . . . . . . . . . . .. . . 5-1
DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
TEST EQUIPMENT ALTERNATIVES . . . . . . . . . . .. . . 5-1
VOLTAGES AND WAVEFORMS . . . . . . . . . . . . . . . . . 4-2
CIRCUIT-BOARD ILLUSTRATIONS . . . . . . . . . . . . . . . 4-2 INDEX TO PERFORMANCE CHECK AND
SWITCH CAM IDENTIFICATION . . . . . . . . . . . . . . . . . 4-4 ADJUSTMENT PROCEDURE . . . . . . . . . .. . .. . ... . . 5-4
DIODE COLOR CODE . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4 PRELIMINARY PROCEDURE . . . . . . . . . . . . . .. . .. . ... . . 5-4
A . TRIGGERING SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . .. . . 5-5
WIRING COLOR CODE . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
SEMICONDUCTOR LEAD CONFIGURATIONS . . . . . 4-4 B . HORIZONTAL/AQS SYSTEM . . . . . . . . . . . . . . . . . . . .. . 5-10
INTER-BOARD PIN CONNECTOR
IDENTIFICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
MULTI-PIN CONNECTOR IDENTIFICATION . . . . . . . 4-4 SECTION &---INSTRUMENT OPTIONS
INTERFACE CONNECTOR PIN LOCATIONS . . . . . . . 4-5
PERFORMANCE CHECK AND ADJUSTMENT . . . . . 4-5
STATIC SENSITIVE DEVICES . . . . . . . . . . . . . . . . . . . . . . . 4-5 SECTION f --REPLACEABLE ELECTRICAL PARTS
TROUBLESHOOTING EQUIPMENT . . . . . . . . . . . . . . . . . . 4-6
TROUBLESHOOTING TECHNIQUES . . . . . . . . . . . . . . . . . 4-6
TROUBLESHOOTING PROCEDURE . . . . . . . . . . . . . . 4-6 SECTION 8--DIAGRAMS AND CIRCUIT BOARD
CORRECTIVE MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . 4-8 ILLUSTRATIONS
OBTAINING REPLACEABLE PARTS . . . . . . . . . . . . . . . . . 4-8
SOLDERING TECHNIQUES . . . . . . . . . . . . . . . . . . . . . . . . . 4-9
COMPONENT REMOVAL AND REPLACEMENT . . . . . 4-10 SECTION 9---REPLACEABLE MECHANICAL PARTS
CIRCUIT BOARDS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10
SWITCHES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-12
SEMICONDUCTORS . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-15 CHANGE INFORMATION
INTERCONNECTING PINS . . . . . . . . . . . . . . . . . . . . . . 4-15
CIRCUIT-BOARD PINS . . . . . . . . . . . . . . . . . . . . . . . . . 4-15
FRONT-PANEL LIGHTS . . . . . . . . . . . . . . . . . . . . . . . . 4-16
ADJUSTMENT AFTER REPAIR . . . . . . . . . . . . . . . . . . . . 4-16
INSTRUMENT' REPACKAGING . . . . . . . . . . . . . . . . . . . . . 4-16
REV JUN 1981
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