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COMMITTED TO EXCELLENCE

IN U TIL N MANUA
Tektronix, Inc .
P .O. Box 500
Beaverton, Oregon 97077 Serial Number,-.-

070-2320-00 First Printing APRIL 1979
(V

.
101 ; . : "IlLhoM me written permission of Tektronix, in

and
man-

I i I dt K5()I I eK(!Uf I I X . k I
y), lektronix U.K . Lir, -,ited .

Ilic!ii w ~1 . ;-,.A. S! ,Hcification and price change
Nriviiuyes are reserved .
7A29 Instruction

PAGE PAGE

LIST OF ILLUSTRATIONS . . . . . . . . . . . . . . . . . . . . ... .. . .. . . . . . . iii SECTION 3 THEORY OF OPERATION
LIST OF TABLES . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . .. . .. . . . . . . iii BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ... .. . . 3-1
OPERATORS SAFETY SUMMARY . . . . . . . . . . . . ... .. . .. . . . . . . iv DETAILED CIRCUIT OPERATION . . . . . . . . . . . . . . . . ... .. . . 3-1
SERVICE SAFETY SUMMARY . . . . . . . . . . . . . . . . ... .. . .. . . . . . . .v INPUT SWITCHING AND READOUT . . . . . . . . . . ... .. . . 3-3
DELAY LINE . . . . . . . . . . . . . . . . . . . . . . . . . . . . ... .. . . 3-3
AC-OFF-DC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ... .. . . 3-3
SECTION 1 GENERAL INFORMATION INPUT ATTENUATORS . . . . . . . . . . . . . . . . . . . ... .. . . 3-3
INTRODUCTION . . . . . . . . . . . . . . . . . . .. . ..... ... .. . .. . 1-1
INPUT PROTECTION . . . . . . . . . . . . . . . . . . . . . ... .. . . 3-3
INSTALLATION . . . . . . . . . . . . . . . . . . .. . . . . .. . .. ... ... 1-1
POWER SUPPLIES . . . . . . . . . . . . . . . . . . . . . . ... .. . . 3-3
INITIAL INSPECTION . . . . . . . . . . .. . . . . .. . .. . .. . .. 1-1
READOUT SWITCHING . . . . . . . . . . . . . . . . . . ... .. . . 3-3
OPERATING INFORMATION . . . . .. . . . . .. . .. . .. . .. 1-1
INPUT AMPLIFIER . . . . . . . . . . . . . . . . . . . . . . . . . . ... .. . . 3-4
OPERATING TEMPERATURE . . . .. . .............. 1-2
FAST OVERLOAD PROTECTION . . . . . . . . . . ... .. . . 3-4
PACKAGING FOR SHIPMENT . . . . . .. . . . . . . . . . . .. . .. 1-2
FEEDBESIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . ... .. . . 3-4
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . .. . .............. 1-2
1-6 INPUT AMPLIFIER . . . . . . . . . . . . . . . . . . . . . . . ... .. . . 3-4
STANDARD ACCESSORIES . . . . . . . . . . .. . . . . . . . . . . . . . ..
POSITION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . .. . . 3-5
RECOMMENDED ACCESSORIES . . .. . .............. 1-6
TRIGGER AND OUTPUT AMPLIFIER . . . . . . . . . .. . .. . . 3-6
PROBES . . . . . . . . . . . . . . . . . . . . . . .. . .............. 1-6
OUTPUT AMPLIFIER . . . . . . . . . . . . . . . . . . . . . ... .. . . 3-6
TRIGGER AMPLIFIER . . . . . . . . . . . . . . . . . . . . .. . .. . . 3-6
SECTION 2 OPERATING INSTRUCTIONS
CONTROLS AND CONNECTORS . . . . . . . . . . . . . . . . . . . 2-1
CHECKOUT PROCEDURE . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
BEFORE YOU BEGIN . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 SECTION 4 MAINTENANCE
PREVENTIVE MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
TEST EQUIPMENT REQUIRED . . . . . . . . . . . . . . . . . . . 2-1
SETUP PROCEDURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 CLEANING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
AMPLIFIER FUNCTIONS . . . . . . . . . . . . . . . . . . . . . . . . 2-3 EXTERIOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . 4-1
DETAILED OPERATING INFORMATION . . . . . . . . . . . . . 2-4 INTERIOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
PROBES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4 VISUAL INSPECTION . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
VERTICAL GAIN CHECK AND PERIODIC ELECTRICAL ADJUSTMENT . . . . . . . . 4-2
SEMICONDUCTOR CHECKS . . . . . . . . . . . . . . . . . . . . 4-2
ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
INPUT COUPLING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
VOLTS/DIV SWITCH . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5 TROUBLESHOOTING AIDS . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
POLARITY SWITCH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5 DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
TRACE IDENTIFICATION AND CIRCUIT BOARD ILLUSTRATIONS . . . . . . . . . . . . . . . 4-2
READOUT FUNCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . 2-5 TROUBLESHOOTING CHART . . . . . . . . . . . . . . . . . . . . 4-2
VARIABLE DELAY (OPTION 4) . . . . . . . . . . . . . . . . . . . 2-5 TEST POINT AND ADJUSTMENT
MATCHING DELAY TIMES USING TWO LOCATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
7A29 UNITS, ONE HAVING VARIABLE COMPONENT COLOR CODING . . . . . . . . . . . . . . . . . . 4-2
DELAY (OPTION 4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5 SEMICONDUCTOR LEAD CONFIGURATIONS . . . . . 4-5
WIRING COLOR CODE . . . . . . . . . . . . . . . . . . . . . . . . . 4-5
INTER-BOARD PIN CONNECTOR
IDENTIFICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5
MULTI-PIN CONNECTOR IDENTIFICATION . . . . . . . 4-5
INTERFACE CONNECTOR PIN LOCATIONS . . . . . . . 4-5
TROUBLESHOOTING EQUIPMENT . . . . . . . . . . . . . . . 4-6
TROUBLESHOOTING TECHNIQUES . . . . . . . . . . . . . . . . . 4-6
THE REMAINING PORTION OF 'THIS TABLE OF 1 . CHECK CONTROL SETTINGS . . . . . . . . . . . . . . . . . 4-6
CONTENTS LISTS THE SERVICING INSTRUCTIONS . 2 . CHECK ASSOCIATED EQUIPMENT . . . . . . . . . . . . 4-6
, THESE SERVICING INSTRUCTIONS ARE FOR USE 3 . VISUAL CHECK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6
BY QUALIFIED PERSONNEL ONLY . 'TO AVOID 4 . CHECK INSTRUMENT ADJUSTMENT . . . . . . . . . . 4-6
ELECTRICAL SHOCK, DO NOT PERFORM ANY 5 . ISOLATE TROUBLE TO A CIRCUIT . . . . . . . . . . . . 4-6
SERVICING OTHER THAN THAT CALLED OUT IN THE 6 . CHECK VOLTAGES AND WAVEFORMS . . . . . . . 4-7
OPERATING INSTRUCTIONS UNLESS QUALIFIED 7 . CHECK INDIVIDUAL COMPONENTS . . . . . . . . . . . 4-7
TO DO SO . 8 . REPAIR AND ADJUST THE CIRCUIT . . . . . . . . . . . A-7
7A29 Instruction

(COQ! = .)

PAGE PAGE

CORRECTIVE MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . 4-8 PART I---PERFORMANCE CHECK . . . . . . . . . . . . . . . . . . .. . 5-8
OBTAINING REPLACEMENT PARTS . . . . . . . . . . . . . . . . 4-8 INDEX TO PART I .-PERFORMANCE CHECK . . . . .. . 5-8
SOLDERING TECHNIQUES . . . . . . . . . . . . . . . . . . . . . . . . . 4-8 PERFORMANCE CHECK POWER-UP SEQUENCE .. . 5-8
COMPONENT REMOVAL AND REPLACEMENT . . . . . . 4-9 A . LOW FREQUENCY . . . . . . . . . . . . . . . . . . . . . . . . . . .. . 5-9
OPTION 4 VARIABLE DELAY LINE . . . . . . . . . . . . . . . 4-9 B . HIGH FREQUENCY . . . . . . . . . . . . . . . . . . . . . . . . . . .. 5-14
CIRCUIT BOARDS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-9 C . INPUT PROTECTION . . . . . . . . . . . . . . . . . . . . . . . . .. 5-18
AC-OFF-DC SWITCH . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10 PART II---ADJUSTMENT AND PERFORMANCE
INPUT ATTENUATORS . . . . . . . . . . . . . . . . . . . . . . . . . 4-11 CHECK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-21
SEMICONDUCTORS . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-14 INDEX TO PART 11--ADJUSTMENT
INTEGRATED CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . 4-14 AND PERFORMANCE CHECK . . . . . . . . . . . . . . . . . . . . 5-21
INTERCONNECTING METHODS . . . . . . . . . . . . . . . . 4-15 ADJUSTMENT AND PERFORMANCE CHECK
COAXIAL END-LEAD CONNECTOR POWER-UP SEQUENCE . . . . . . . . . . . . . . . . . . . . . . . . . . 5-21
(PELTOLA CONNECTOR) . . . . . . . . . . . . . . . . . . . . . . . 4-16 A . LOW FREQUENCY . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-22
END-LEAD PIN CONNECTOR (P220) . . . . . . . . . . . . 4-16 B . HIGH FREQUENCY . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-29
MULTIPLE END-LEAD PIN CONNECTOR C . INPUT PROTECTION . . . . . . . . . . . . . . . . . . . . . . . . . . 5-36
(HARMONICA CONNECTOR) . . . . . . . . . . . . . . ., . . . 4-16
INTERBOARD MULTI-PIN CONNECTOR
(COMB CONNECTOR, J70) . . . . . . . . . . . . . . . . . . . . . 4-16
CIRCUIT-BOARD PINS . . . . . . . . . . . . . . . . . . . . . . . . . 4-16 SECTION 6 INSTRUMENT OPTIONS
FRONT-PANEL RESET LIGHT . . . . . . . . . . . . . . . . . . . 4-17
ADJUSTMENT AFTER REPAIR . . . . . . . . . . . . . . . . . 4-17
SECTION 7 REPLACEABLE ELECTRICAL PARTS
SECTION 5 CALIBRATION
USING THESE PROCEDURES . . . . . . . . . . . . . . . . . . 5-2 SECTION 8 DIAGRAMS AND CIRCUIT BOARD
PERFORMANCE CHECK SUMMARY . . . . . . . . . . . . 5-2 ILLUSTRATIONS
ADJUSTMENT INTERVAL . . . . . . . . . . . . . . . . . . . . . . 5-5
TEKTRONIX FIELD SERVICE . . . . . . . . . . . . . . . . . . . . 5-5
SECTION 9 REPLACEABLE MECHANICAL PARTS
TEST EQUIPMENT REQUIRED . . . . . . . . . . . . . . . . . . . . . 5-5
SPECIAL FIXTURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-5
TEST EQUIPMENT ALTERNATIVES . . . . . . . . . . . . . 5-5 CHANGE INFORMATION
7A29 Instruction

FIGURE FIGURE
PAGE NO . PAGE
NO .
4-8 Exploded view of circuit-board pin and
7A29 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .vi ferrule . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-16
VARIABLE (Volts/Div) control effects on 4-9 Front-panel light socket assembly . . . . . . . . . . . . . 4-17
bandwidth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
1-2 Maximum rms input voltage . . . . . . . . . . . . . . . . . . . . 1-5
The illustrations in section 8 are located near their associated
1-3 7A29 dimensional drawing . . . . . . . . . . . . . . . . . . . . . 1-7
diagrams on the foldout page .
2-1 Front-panel controls, connectors and
indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2 8-1 Semiconductor Lead Configurations .
3-1 Basic block diagram of the 7A29 Amplifier . . . . . 3-2 8-2 Circuit Board Locations .
4-1 Color code for resistors . . . . . . . . . . . . . . . . . . . . . . . . 4-3 8-3 A1-Main circuit board assembly .
4-2 Semiconductor lead configurations . . . . . . . . . . . . . . 4-4 8-4 A3-Readout Switching circuit board assembly .
4-3 Inter-board multi-pin connector assembly . . . . . . . 4-5 8-5 A1-Main circuit board assembly .
4-4 Orientation of multi-connector holders . . . . . . . . . . 4-5 8-6 A2-High Frequency circuit board assembly .
4-5 Location of pin numbers on interface 8-7 A1-Main circuit board assembly.
connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6 8-8 A2-High Frequency circuit board assembly.
4-6 HYPCON connector assembly . . . . . . . . . . . . . . . . . . 4-12 8-9 7A29 Troubleshooting Chart .
4-7 Coaxial end-lead connector assembly . . . . . . . . . . 4-15 8-10 Test Point & Adjustment Locations .

TABLE
NO . PAGE

1-1 Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . 1-2
1-2 Environmental Characteristics . . . . . . . . . . . . . . . . . . 1-5
1-3 Physical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . 1-6
4-1 Attenuator Fault Location . . . . . . . . . . . . . . . . . . . . . 4-11
5-1 Calibration Procedure Electives . . . . . . . . . . . . . . . . . 5-1
5-2 Performance Check Summary . . . . . . . . . . . . . . . . . . 5-2
5-3 Test Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-5
5-4 Vertical Deflection Accuracy . . . . . . . . . . . . . . . . . . 5-11
5-5 Control Settings for Low-Frequency
Step Response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-12
5-6 1 G Hz Gain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-15
5-7 Vertical Deflection Accuracy . . . . . . . . . . . . . . . . . . 5-26
5-8 Control Settings for Low-Frequency
Step Response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-27
5-9 Vertical Amplifier Frequency Gain . . . . . . . . . . . . 5-33
6-1 Option Information Locator . . . . . . . . . . . . . . . . . . . . 6-1