Tektronix 7140 User manual

7104
OSCILLOSCOPE
WITH
OPTIONS
r

T~Jctronbc
INSTRUCTION MANUAL
Tektronix, Inc .
P .O . Box 500
Beaverton, Oregon

97077

Serial
Number
COMMffTEDTO EXCELLENCE
PLEASE CHECK FOR
CHANGE INFORMATION
AT THE REAR OF THIS
MANUAL .
7104
OSCILLOSCOPE
WITH
OPTIONS
070-2314-00

First
Printing NOV 1978
Product Group 42
Revised NOV 1986

Copyright © 1978 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

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 pa~iel 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 :
8000000

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

PAGE

PAGE
LIST OF ILLUSTRATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iv

INTENSITY
MODULATION . . . . .. .. .. .. ... .. .. .. 2-15
LIST
OF TABLES .. .. .. .. .. .. .. ... .. .. .. .. .. .. . . . . . . . .
vi

REMOTE INPUT SIGNALS . . . . .. .. .. .. ... .. .. .. 2-15
OPERATORS SAFETY SUMMARY .. .. ... .. .. .. .. . . . . . . . vii

APPLICATIONS
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-15
SERVICING SAFETY SUMMARY . . . . . . . . . . . . . . . . . . . . . . . . ix

VERTICAL AMPLIFIER PLUG-IN UNITS . . . . . . . . . .

2-15
TIME-BASE PLUG-IN UNITS . . . . . . . . . . . . . . . . . . . . 2-16
SECTION 1 GENERAL INFORMATION

SAMPLING DISPLAYS . . . . . . . . . . . . . . . . . . . . . . . . 2-16
INTRODUCTION .. .. .. .. .. .. ... .. .. .. .. . . . . . . . . . .
1-1

SPECIAL PURPOSE PLUG-IN UNITS . . . . . . . . . . . . 2-16
OPERATORS MANUAL ... . ... .. .. .. ..
. . . . . . . . . .

1-1

X-Y OPERATION . . . . . . . . .. .. .. .. ... .. .. .. .. ... 2-17
INSTRUCTION MANUAL . . . . . . . . . . . . . . . . . . . . . . . . .
1-1

RASTER DISPLAYS . . . . . . .. .. .. .. ... .. .. .. .. .. 2-17
INSTALLATION
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
INITIAL
INSPECTION
. . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
OPERATING-POWER
INFORMATION . . . . . . . . . . . . . . 1-1
OPERATING VOLTAGE .. .. ... .. .. .. .. . . . . . . . . . . 1-2

WARNING
OPERATING TEMPERATURE . . . . . . . . . . . . . . . . . . . .

1-2
OPERATING POSITION . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
PACKAGING FOR SHIPMENT . . . . . . . . . . . . . . . . . . . . . . 1-3

THE REMAINING PORTION OF THIS TABLE OF
SPECIFICATION .. .. .. .. .. ... . ... .. .. .. .. . . . . . . . . . . 1-3

CONTENTS LISTS THE SERVICING INSTRUC-
SYSTEM ELECTRICAL SPECIFICATION . . . . . . . . . . . . .
1-11

TIONS . THESE SERVICING INSTRUCTIONS ARE
STANDARD ACCESSORIES . . . . . . . . . . . . . . . . . . . . . . . .
1-14

FOR USE BY QUALIFIED PERSONNEL ONLY . T O
SECTION 2 OPERATING INSTRUCTIONS

AVOID ELECTRICAL SHOCK, DO NOT PERFORM
PRELIMINARY
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . 2-1

ANY SERVICING OTHER THAN THAT CALLED OUT
REDUCTION
OF
DISPLAY GAIN WITH

IN

THE

OPERATING

INSTRUCTIONS

UNLESS
OUTPUT CHARGE
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

QUALIFIED TO DO SO .
PLUG-IN UNITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
INSTALLATION OF PLUG-IN UNITS . . . . . . . . . . . . . . . 2-2

SECTION 3 THEORY OF
OPERATION
CONTROLS AND CONNECTORS . . . . . . . . . . . . . . . . . . . 2-2

BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
FRONT-PANEL COLOR CODING . . . . . . . . . . . . . . . . .

2-2

DESCRIPTION . .. .. ... .. .. .. .. ... .. .. .. .. . . . . .

3-1
OPERATORS CHECKOUT PROCEDURE . . . . . . . . . . . . . 2-2

DETAILED CIRCUIT OPERATION . . . . . . . . . . . . . . . . . . . 3-4
TEST EQUIPMENT REQUIRED . . . . . . . . . . . . . . . . . . 2-2

LOGIC FUNDAMENTALS . . . . . . . . . . . . . . . . . . . . . . . 3-4
PRELIMINARY SETUP . . . . . . . . . . . . .. .. .. .. ... ..
2-2

SYMBOLS .. ... . ... .. .. .. .. ... .. .. .. .. . . . . . 3-4
DISPLAY FOCUS . . . . . . . . . . . . . .. .. .. .. ... . ... ..

2-3

LOGIC POLARITY .. .. .. .. .. ... .. .. .. .. . . . . .

3-4
TRACE ALIGNMENT . . . . . . . . . . . . . . . . . . . . . . . . . . .

2-3

INPUT/OUTPUT TABLES . . . . . . . . . . . . . . . . . . . . .

3-8
GRATICULE ILLUMINATION . . . . .. .. .. .. ... . ... .. 2-3

NON-DIGITAL SERVICES . . . . . . . . . . . . . . . . . . . . . . . 3-8
CONTROL
ILLUMINATION . . . . . .. .. .. .. ... .. .. ..

2-3

CABLE DISTRIBUTION . . . . . . . . . . . . . . . . . . . . . . . . .

3-8
VERTICAL DEFLECTION SYSTEM . . . . . . . . . . . . . . . 2-3

MODE SWITCH AND
CALIBRATOR . . . . . . . . . . . . . . . 3-8
HORIZONTAL DEFLECTION SYSTEM .. .. ... .. .. .. 2-3

CALIBRATOR . . . . .... .. ... .. .. .. .. .. ..
. . . . .
3-8
TRIGGERING . . . . . . . . . . . . . . . . .. .. .. .. ... .. .. .. 2-7

MODE SWITCHING . . . . . . . . . . . . . . . . . . . . . . . . .
3-8
READOUT . . . . . . . . . . . . . . . . . . .. .. .. .. ... .. .. .. 2-7

MAIN INTERFACE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8
BEAMFINDER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8

LOGIC
.. .. ... . ... .. .. .. .. ... .. .. .. .. . . . . . . . . . .3-8
CALIBRATOR . . . . . . . . . . . . .. .. .. .. .. .. ... .. .. .. 2-8

HORIZONTAL LOGIC .. .. ... .. .. .. .. . . . . . . . . 3-10
Z-AXIS INPUT . . . . . . . . . . . .. .. .. .. ... . ... .. .. .. 2-8

Z-AXIS LOGIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12
INTENSITY LIMITING . . . . . .. .. .. .. ... . ... .. .. ..
2-8

HORIZONTAL BINARY . . . . . . . . . . . . . . . . . . . . . . 3-13
DETAILED OPERATING INFORMATION . . . . . . . . . . . . . . .
2-8

VERTICAL BINARY . . . . . . . . . . . . . . . . . .. .. ... 3-15
GRATICULE . . . . . . . . . .. .. .. .. .. .. ... .. .. .. .. ..

2-8

PLUG-IN BINARY . . . . . . . . . . . . . . . . . . . .. .. ...

3-16
GRATICULE ILLUMINATION . . . . . . . . . . . . . . . . . . . . .

2-8

VERTICAL CHOPPED BLANKING . . . . . . .. .. ... 3-17
LIGHT FILTER . . . . . . . . . . . .. .. .. .. ... . ... .. .. .. 2-9

CHOP COUNTER . . . . . . . . . . . . . . . . . . . .. .. ...
3-18
CONTROL ILLUMINATION . . . . . . . . . . . . . . . . . . . . . . 2-9

VERTICAL MODE
LOGIC . . . . . . . . . . . .. .. .. ...
3-21
INTENSITY CONTROLS . . . .. .. .. .. ... .. .. .. .. .. 2-9

TRACE SEPARATION
. . . . . . . . . . . . . . . . .. .. ... 3-21
DISPLAY FOCUS . . . . . .. .. .. .. ... . ... .. .. .. .. ..

2-9

MCP
(MICROCHANNEL PLATE) INTENSITY
ASTIGMATISM-FOCUS ADJUSTMENTS . . . . . . . . . . .

2-9

TRACKING .. .. .. .. ... .. .. .. .. . . . .. .. .. ...

3-22
BEAMFINDER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10

TIME-BASE CONTROLLED Z-AXIS FOR X-Y
TRACE ALIGNMENT . . . . . . . . . . . . . . . . . . . . . . . . . .

2-10

DISPLAYS . . . . . . . . . . . . . . . . . . . . . .. .. .. .. ... 3-22
READOUT DISPLAY . . . . . . . . . . . . . . . . . . . . . . . . . .
2-10

TRIGGER SELECTOR .. ... .. .. .. .. . . . . . . . . . . . . 3-24
CARE OF CRT SCREEN . . . . . . . . . . . . . . . . . . . . . . .

2-11

A AND B TRIGGER CHANNEL SWITCHES . . . . . 3-24
VERTICAL AND HORIZONTAL
MODE

A AND B TRIGGER AMPLIFIER . . . . . . . . . . . . . . 3-24
COMBINATIONS
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-11

VERTICAL SIGNAL OUTPUT
AMPLIFIER . . . . . .

3-25
VERTICAL TRACE SEPARATION ... .. .. .. .. ... . .

2-13

READOUT SYSTEM SN 8053266 & BELOW . . . . . . . . .

3-25
TRIGGER SOURCE . . . . . . . . . . . . . . . . . . . . . . . . . . .

2-13

DISPLAY FORMAT . . . . . . . . . . . . . .. .. .. .. ... .. ..

3-25
CALIBRATOR OUTPUT . . . . . . . . . . . . . . . . . . . . . . . .

2-13

DEVELOPING THE DISPLAY . . . . . . . . . . . . . . . . . . . .
3-27
SIGNAL OUTPUTS . .. .. .. ... . ... .. .. .. .. ... .. 2-14

TIMER . . . . . . . . . . . . . . . . . . . . . . . .. .. .. .. ... .. .. 3-28
DISPLAY PHOTOGRAPHY . . . . . . .. .. .. .. .. ... .. 2-14

TIME-SLOT COUNTER . . . . . . . . . . . . . . . . . . . . . . . . . 3-31
REV NOV 1985
TABLE OF CONTENTS
7104 Instruction

7104 Instruction
TABLE OF CONTENTS
(CONT)
PAGE

PAGE
WORD TRIGGER . . . . . . . . . . . . . . . . . . . . . . . . . . . . -

3-31

CRT CIRCUIT
.. .. ... .. .. .. .. .. .. ..- -- -- -- - - - - - -

3-60
CHANNEL COUNTER . . . . . . . . . . . . . . . . . . . . . . . . .
3-32

CONTROL GRID DC
RESTORER . . . . . . . . . . . . . . . .

3-60
SINGLE-SHOT LOCKOUT
. . . . . . . . . . . . . . . . . . . . . . 3-32

FOCUS
GRID DC RESTORER . . . . . . . . . . . . . . . . . -
3-63
ENCODING THE
DATA . . . . . . . . . . . . . . . . . . . . . . . - 3-32

HIGH-VOLTAGE
TRANSFORMER . . . . . . . . . . . . . . . .

3-63
COLUMN AND ROW
DATA SWITCHES . . . . . . . . . . .

3-34

ANODE
VOLTAGE MULTIPLIER .. .. .. .. .. ... .. ..

3-63
DISPLAY-SKIP
GENERATOR . . . . . . . . . . . . . . . . . . . 3-35

GRID BIAS SUPPLY .. .. ... .. .. .. .. .. .. --- -- --
3-63
COLUMN
AND ROW DECODERS . . . . . . . . . . . . . . .

3-35

MICROCHANNEL PLATE SUPPLY
.. .. .. .. ... .. ..

3-63
ZEROS
LOGIC AND MEMORY . . . . . . . . . . . . . . . . . .
3-35

GRID BIAS . . . . . . . . .. .. .- -- --- -- -- ~~ ~~ ~~ ~~ ~~-
3-64
CHARACTER GENERATOR . . . . . . . . . . . . . . . . . . . .
3-37

-2400 VOLT SUPPLY
. .. .. .. ... .. .. .. .. .. .- --. 3-64
DECIMAL POINT LOGIC AND CHARACTER

GRID CROW BAR . . .. .. .. .. ... . ... .. .. .- -- ---
3-65
POSITION COUNTER . . . ... .. .. .. . .
. . . . . . . . . . . 3-37

CRT . . . . . . . . . . . . . .. .
. .. .. .. .. ... .. .. .. .. . . . 3-65
FORMAT GENERATOR . . . . . . . . . . . . . . . . . . . . . - - -
3-38

CONTROL RECTIFIER
. . . . . . . . . . . . . . . . . . . . - - - - - - - 3-66
Y-OUTPUT . . . . . . . . . . . . . . . . . . . . . . . . . . . - - - - - - .

3-38

INVERTER START
NETWORK . . . . . . . . . . . . . . . . . .

3-66
X-OUTPUT . . .. .. .. .. .. .. . . . . . . . . . . .
. . . . . . . . . 3-38

INVERTER ... .. . . . . . .
. .. .. .. .. .. .. ... . . . . . . .
3-67
DISPLAY SEQUENCE . . . . . . . . . . . . . . . . . . . . . . . . -
3-38

OVER-VOLTAGE
STOP . . . . . . . . . . . . . . . . . - - - - - - - .
3-67
READOUT SYSTEM SN B053267 &
ABOVE . . . . . . . . . . 3-38

INVERTER
CONTROL . . . . . . . . . . . . . . . . . . - - - - - - -
3-67
DISPLAY FORMAT
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-40

POWER ON
LOGIC . . . . . . . . . . . . . . . . . - - - - - ~ - ~ ~ -
3-69
DEVELOPING
THE DISPLAY . . . . . . . . . . . . . . . . . . . . 3-40

LV
REGULATOR .. ... . ... .. .. .. .. . . . . . . . - - - - - ~ ~ -

3-69
TIMER . . . . . . . . . . . . . . . . . . . . . . . . - - - - - - ~ - - - - - - -

3-43

OPERATIONAL AMPLIFIER
POWER
TIME-SLOT
COUNTER .. .. .. ... .. .. .. .. .. .. . . . .
3-43

SUPPLIES .. .. .. .. ... .. .. .. .. .- -- - - - ~ ~ ~ - ~ ~ ~ -
3-69
WORD
TRIGGER ... .. .. .. .. .. . . . . . . . . - - - - - - - .
3-46

+50 VOLT SUPPLY . . . . . . . . . . . . . . . . . . . . . - ~ - - - .

3-70
CHANNEL COUNTER . . . . . . . . . . . . . . . . . . . . . . . . .

3-46

-15 VOLT SUPPLY . . . . . . . . . . . . . . . . . . . . . . . . - - .
3-70
SINGLE-SHOT LOCKOUT . . . . . . . . . . . . . . . . . . . . . .
3-46

+5
VOLT SUPPLY .. .. .. .. .. ... -. .. .. .- - - - - - --
3-70
ENCODING THE DATA . . . . . . . . . . . . . . . . . . . . . . . -
3-46

+15 VOLT SUPPLY
. . . . . . . . . . . . . . . . . . . . . - - -
- -.
3-70
COLUMN AND ROW DATA SWITCHES . . . . . . . . . . .
3-47

-50 VOLT SUPPLY
. . . . . . . . . . . . . . . . . . . . . . - - - - .
3-71
DISPLAY-SKIP GENERATOR
. . . . . . . . . . . . . . . . . . . 3-48

FAN CIRCUIT . .. ... . ... .. .. .. .- --- -- -- -- -- ~~ -
3-71
COLUMN AND ROW
DECODERS . . . . . . . . . . . . . . . 3-48

GRATICULE-LIGHT
SUPPLY . . . . . . . . . . . . . . . . . . . -
3-71
ZEROS LOGIC AND MEMORY
. . . . . . . . . . . . . . . . . . 3-49

DELAY COMP
(OPTION 2) . . . . . . . . . . . . . . . . . . - - - - - .

3-71
CHARACTER
GENERATOR . . . . . . . . . . . . . . . . . . . . 3-49

TIME-BASE
OPERATION . . . . . . . . . . . . . . . . . . . . - -
3-71
HORIZONTAL
CHARACTER POSITION

X-Y
OPERATION . . . . . . . . . . . . . . . . . . - - - - - - - - - - - -
3-71
COUNTER . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-51
DECIMAL
POSITION LOGIC . . . . . . . . . . . . . . . . . . . .
3-51

SECTION
4 MAINTENANCE
X-Y
VECTOR GENERATORS .. ... . ... .. .. .. .. -- 3-52

PREVENTATIVE MAINTENANCE . .. .. .. .. ... .. .. -- -.
4-1
X-Y OUTPUT
AMPLIFIERS . . . . . . . . . . . - . . . . . . . - -

3-52

CABINET PANEL REMOVAL
. . .. .. .. .. ... . ... .. .-

4-1
SIGNALS OUT . . . . . . . . . .. .. .. .. . .
. . . . . . . . . . . . . . . 3-52

CLEANING ... .. .. . . . . . . . .
. . . . . . . . . . . . . . . . . . . .
4-1
+SAWTOOTH AMPLIFIER . . . . . . . . . . . . . . . . . . . . .
3-53

EXTERIOR . . . . . . . . . . . . . . . . - -- -- -- -- --~ ~ ~--
4-1
+GATE AMPLIFIER . . . . . . .. .. .. . . . . . .
. . . . . . . . . 3-53

CRT . . . . . . . . .
. . . . . . . . . . . . . . .. .. .. .. . . . . . . .
4-1
GRATICULE ILLUMINATION
. . . . . . . . . . . . . . . . . . . . 3-53

INTERIOR . . . . . . . . . . . . . . . . - - - - - - - - - - - - - ~ ~ - -
4-2
VERTICAL CHANNEL SWITCH
....... .. .. ... .. .. .. 3-53

VISUAL INSPECTION
. . . . . . . . . . . . . . . .. .. .. .. ..-

4-2
CHANNEL SWITCH . . . . . . . . . . . . . . . . . . : . . . . . . . .
3-53

SEMICONDUCTOR
CHECKS . . . . . . . . . . . . . . . - - - - -
4-2
VERTICAL CHANNEL
SELECTOR .. .. .. .. .. ... ..

3-53

PERIODIC
ELECTRICAL ADJUSTMENT
. . . .
. . . . . . .

4-2
RIGHT AND LEFT
CHANNEL FEEDBESIDE . . . . . . .

3-54

TROUBLESHOOTING
. . . . . . . . . . . . . . - - - - - - ~ - - - - - ~ ~ -

4-2
VERTICAL
AMPLIFIER . . . . . . . . . . . . . . . . . . . . . . . . . . -

3-54

TROUBLESHOOTING AIDS .. ... .. .. .- .. . . . - - - - -

4-2
DELAY-LINE COMPENSATION . . . . . . . . . . . . . . . . . .
3-54

DIAGRAMS . . ... .. .. .. .. ..- -- -- -- -- -- -- ~ ~ ~ -
4-2
OUTPUT
AMPLIFIER . . . . . . . . . . . . . . . . . . . . - - - - - - 3-55

CIRCUIT BOARD
ILLUSTRATIONS . . . . . . . . . . . .

4-2
FEEDBESIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . - - - - -
3-55

TROUBLESHOOTING
CHART .. ... .. .. .. .. .. . .

4-3
AUXILIARY AMPLIFIER . . . . . . . . . . . . . . . . . . . . . . . -

3-55

ADJUSTMENT
AND
TEST
POINT
OUTPUT
AMPLIFIER . . . . . . . . . . . . . . . . . . . . . . . . . .

3-55

LOCATIONS . .. .. ... .. .. .. .. .. .. ... -- -- -- ~~

4-3
POWER SUPPLY SHUTDOWN . . . . . . . . . . . . . . . . . .
3-56

COMPONENT COLOR
CODING . . . . . . . . . . . . . - .
4-3
HORIZONTAL CHANNEL SWITCH
. . . . . . . . . . . . . . . . . .

3-56

SEMICONDUCTOR
LEAD CONFIGURATIONS . . . .

4-3
CHANNEL SWITCH . . . . . . . . . . . . . . . . . . . . . . . . - - -
3-56

MULTI-PIN
CONNECTORS . ... .. .. .. .. ... .. --
4-3
HORIZONTAL CHANNEL
SELECTOR . . . . . . . . . . . .

3-56

TROUBLESHOOTING
EQUIPMENT ... .. .. .. .. .. .. ...

4-3
A AND B
CHANNEL FEEDBESIDE . . . . . . . . . . . . . . . 3-56

TROUBLESHOOTING
TECHNIQUES . . . . .. .. .. .. .- --.

4-6
HORIZONTAL AMPLIFIER
. . . . . . . . . . . . . . . . . . . . . . . .

3-57

1 .
CHECK CONTROL SETTINGS ... .. .. .. .. ...

4-6
READOUT
POSITIONING . . . . . . . . . . . . . . . . . . . - - - 3-57

2 .
CHECK ASSOCIATED
EQUIPMENT . . . . . . . . . . 4-6
OUTPUT
AMPLIFIER . . . .. .. .. .. .. ... .. .. .. .. .. 3-57

3 . VISUAL
CHECK . . . . . . . . . . . . . . . . . . . . . . . - - -
4-6
INPUT CLAMP
. .. .. .. ... .. .. .. .. .. .. ... .. .. --

3-57

4 . CHECK INSTRUMENT ADJUSTMENT
. . . . . . . .

4-6
INTENSITY
LIMITER AND Z-AXIS . . . . . . . . . . . . . . . . . .

3-58

5 .
ISOLATE TROUBLE TO
A CIRCUIT . . . . . . . . . .

4-6
INTENSITY LIMITER .. .. .. ... .. .. .. .. .. .. ... ..
3-58

6 .
CHECK VOLTAGES AND WAVEFORMS
. . . . . . 4-7
Z-AXIS
AMPLIFIER . .. .. .. ... .. .. .. .. .. .. .-- --

3-59

7 . CHECK INDIVIDUAL
COMPONENTS . . . . . . . - .

4-7
AUTO FOCUS . . . . . . . . . . . . . . . . .. .. .- -- -- --- --

3-60

8 . REPAIR AND
ADJUST THE CIRCUIT . . . . . . . .

4-7
REV NOV
1985

TABLE OF
CONTENTS (CONT)
TROUBLESHOOTING
THE HIGH-EFFICIENCY
POWER-SUPPLY UNIT ... .. .. .. .. ... . . . . . . . . . ~ ~ ~ ~ .
4-7
GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . 4-7
PRELIMINARY PROCEDURE . . . . . . . . . . . . . . . . .
4-8
TROUBLESHOOTING PROCEDURE . . . . . . . . . . . .
4-8
TROUBLESHOOTING THE CRT AND ASSOCIATED
CIRCUITRY . .. .. .. .. ... . . . . . . . . . . . . . .
. . . . . . . . . . 4-12
CRT DISPLAY SYMPTOM
CHECKOUT
PROCEDURE . . . . . .... .. .. .. .. ... .
. . . . . . . . . 4-13
CRT CIRCUIT
TROUBLESHOOTING
PROCEDURE .. .. .. ... .. .. .. .. .. .. ... .. .. . .
4-13
CORRECTIVE MAINTENANCE
. . . . . . . . . . . . . . . . . . . . . 4-22
OBTAINING
REPLACEMENT PARTS . . . . . . . . . . . . .

4-22
SOLDERING
TECHNIQUES . . . . . . . . . . . . . . . . . . . .
4-22
COMPONENT
REMOVAL AND REPLACEMENT ... ..
4-23
DISPLAY UNIT KICKSTAND . . . . . . . . . . . . . . . . .
4-23
POWER-SUPPLY UNIT REMOVAL . . . . . . . . . . . .
4-23
CATHODE-RAY TUBE REMOVAL . . . . . . . . . . . . .
4-24
CATHODE-RAY TUBE REPLACEMENT
. . . . . . . . 4-25
CIRCUIT BOARDS . . . . . . . . . . . . . . . . . . . . . . . . -
4-25
PLUG-IN INTERFACE CONNECTORS
. . . . . . . . . 4-30
DELAY LINE REMOVAL
. . . . .. ... .. .. .. .. .. .. 4-30
SEMICONDUCTORS .. .. .. .. .. .. ... .. .. .. ..
4-30
INTERCONNECTING
PINS
. . . . . . . . . . . . . .. .~ ~.
4-34
PUSHBUTTON SWITCHES . .. .. .. ... .. .. .. ..
4-35
GRATICULE
LIGHT BULBS . . . . . . . . . . . . . . . . . .
4-35
POWER
TRANSFORMER . . . . . . . . . . . . . . . . . . . .
4-35
LINE
FUSE
. . . . . . . . . . . . .. .. .. .. .. .. ... .. ..
4-37
ADJUSTMENT
AFTER REPAIR . . . . . . . . . . . . . . .
4-37
7104 Instruction
PART I-PERFORMANCE CHECK
. . . . . . . . . . . . . . . 5-15
INDEX TO PERFORMANCE
CHECK
PROCEDURE . . . . . . . . . . . . . . . . . . . . . . . . . . .. ..
5-15
PERFORMANCE CHECK
POWER-UP
SEQUENCE
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-15
A .
Z-AXIS AND DISPLAY . . . . . . . .. .. .. .. ... .. 5-16
B .
CALIBRATOR AND OUTPUT SIGNALS . . . . . 5-18
C . TRIGGER SYSTEM . . . . . . . . . . . . . . . . . . . . . .
5-22
D . HORIZONTAL SYSTEM . . . . . . . . . . . . . . . . . . 5-24
E . VERTICAL SYSTEM . . . . . . . . . . . . . . . . . . . . .

5-27
F . READOUT SYSTEM . . . . . . . . . . . . . . . . . . . . .
5-31
G . PHOTOGRAPHIC WRITING
RATE .
. . . . . . . . .
5-33
PART II-ADJUSTMENT AND PERFORMANCE
CHECK . . . . . . ... .. .. .. . . . . . . . . . . . . . . .
. . . . . . . 5-35
INDEX TO ADJUSTMENT
AND PERFORMANCE
CHECK . .. ... .. . . . . . . . . . .
. . . . . . . . . . . . . . . . 5-35
ADJUSTMENT
AND PERFORMANCE CHECK
POWER-UP SEQUENCE
. . . . . . . . . . . . . . . . . . . . 5-35
A . POWER
SUPPLY . . . . . . . . . . . . . . . . . . . . . . . 5-36
B .
Z-AXIS AND DISPLAY . . . . . . . . . . . . . . . . . . . 5-38
C .
CALIBRATOR AND OUTPUT SIGNALS ... .. 5-46
D .
TRIGGER SYSTEM .. .. .. ... .. .. .. .. . . . . . 5-50
E . HORIZONTAL SYSTEM . . . . . . . . . . . . . . . . . .
5-54
F . VERTICAL SYSTEM . . . . . . . . . . . . . . . . . . . . . 5-61
G . READOUT SYSTEM SN B053266
& BELOW . . . . . . .
. . ... .. .. .. .. ... .. .. .. .. . 5-68
G . READOUT SYSTEM SN 8053267
& ABOVE . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . 5-71
H . PHOTOGRAPHIC
WRITING RATE . . . . . . . . . . 5-74
SECTION 8 INSTRUMENT
OPTIONS
SECTION 5 CALIBRATION
USING
THESE PROCEDURES . .. .. .. .. ... .. .. 5-2

SECTION
7 REPLACEABLE ELECTRICAL PARTS
PERFORMANCE CHECK SUMMARY .. .. ... .. .. 5-2
ADJUSTMENT INTERVAL . . . . . .. .. .. .. ... .. ..
5-2

SECTION 8 DIAGRAMS AND CIRCUIT
BOARD
TEKTRONIX FIELD SERVICE . . .. .. .. .. ... .. ..
5-2

ILLUSTRATIONS
TEST
EQUIPMENT REQUIRED . . . . . . . . . . . . . . . . .
5-12
SPECIAL FIXTURES . . . . . . . . . . . . . . . . . . . . . . .
5-12

SECTION 9 REPLACEABLE MECHANICAL
PARTS
TEST EQUIPMENT ALTERNATIVES . . . . . . . . . . .

5-12
CHANGE INFORMATION

7104 Instruction
IV
LIST
OF
ILLUSTRATIONS
FIGURE

PAGE FIGURE

PAGE
NO .

NO .
Frontis
piece

7104 Features . . . . . . . . . . . . : . . . . . . . . . . . . . . . . . . .
x

3-20

Character selection matrix for 7104 Readout
1-1

7104 dimensional drawing . . . . . . . . . . . . . . . . . . . .

1-12

System SN 8053267 & Above . . . . . . . . . . . . . . . .

3-41
3-21

Detailed block diagram of 7104 Readout System
2-1

Front-panel controls, connectors and

SN ~053267 & Above . . . . . . . . . . . . . . . . . . . . . . . 3-44
indicators .. ... .. .. .. .. . . . . . . . . . . . . . . . . . . . . .

2-4

3_22

Developing a typical character on the crt
2-2

Rear-panel controls and connectors . . . . . . . . . . . . .
2-6

SN ~053267 & Above . ... . ... .. .. .. .. ... .. .. 3-50
2-3

Definition
of
graticule measurement lines
. . . . . . . . .

2-8

3_23

Theoretical timing diagrams for the Intensity
2-4

Location of readout on the crt
identifying the

Limiting
stage . .. .. .. ... .. .. .. .. .. .. ... .. .. 3-61
originating plug-in and channel . . . . . . . . . . . . . . . . 2-10

3_24

(A) Representation of Inverter stage . Idealized
waveforms
of
(B)
total inverter current,
h,
3-1

Basic block diagram of the 7104 Oscilloscope . . . . .

3-2

(C)
voltage of CR1234 and CR1241, and (D) voltage
3-2

Breakdown of sep~rate stages within Horizontal

across primary . .. ... . ... .. .. .. .. ... .. .. .. ..

3-68
Logic IC (4428) . . . . . . . . . .. .. .. .. ... .. .. .. .. 3-10
3-3

(A) Diagram of clock generator stage ; (B) Idealized

4_1

Color code for resistors and capacitors . . . . . . . . . .

4-4
waveform for clock generator stage . . . . . . . . . . . .

3-18

q-2

Semiconductor lead configurations .. ... .. .. .. .. .

4-5
3-4

Idealized waveforms for the Vertical Chopped

4-3

Orientation of multi-pin connectors . . . . . . . . . . . . . .

4-6
Banking IC (04320) . . . . . . .. .. .. .. ... .. .. .. .. 3-19

4_4

Current sensing waveform at R1284 showing :
3-5

(A) Input and output pins
for
Chop Counter IC,

A . Power supplies not in current limit operation
04340 ; (B) Idealized waveforms for Chop Counter

B . Power supplies in current limit operation . . . . .

4-10
stage . . . . . . . . . . . . . .. .. .. .. .. .. ... .. .. .. ..
3-20

4_5

Location of line shortage capacitor screws used
3-6

Logic diagram of Vertical Mode Logic stage . . . . .

3-22

for manually
discharging C1216 and C1217 . . . . . .

4-10
3-7

(A) Logic diagram of Trace Separation stage ;

4-6

Typical waveforms on C1216
and
C1217 with the
(B) Table of input/output combinations . . . . . . . . . . 3-23

line voltage set to about 20 volts . . . . . . . . . . . . . . 4-11
3-8

Location of readout display on the crt identifying

4_7

Current waveforms of T1230 showing burst
the originating plug-in and channel . . . . . . . . . . . . .

3-25

operation at line voltage of about 60 volts . . . . . . .

4-12
3-9

Character selection matrix for 7104 Readout

4_g

Current waveform at T1230 for normal inverter
System SN ~053266 & Below . . . . . . . . . . . . . . . . 3-26

operation at line voltage of 115 volts . . . . . . . . . . . 4-12
3-10

Typical readout display where only channel 2 of the

4_g

Waveform at TP1234 on the power-supply Inverter
Right Vertical and B Horizontal units is displayed .

3-27

board with the line voltage at about 20 volts . . . . .

4-12
3-11

Output waveforms of the Timer stage . . . . . . . . . .

3-29

4_10

Typical waveform at junction of R1811 and
3-12

Detail
of output at
pins 12,
13,
14 and 16 of

CR1747
on the
High
Voltage circuit board . . . . . . . 4-17
02126 . . . . . . . . .. .. .. .. .. .. ... .. .. .. .. ... . 3-29

4_11

Typical waveform
at junction of R1814 and
3-13

Timer
stage operation
when display-skip condition

CR1816 on
the High
Voltage circuit board .. .. ...

4-18
occurs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-30

4_12

Power supply unit securing screws . .. .. .. .. ... 4-23
3-14

Timer relationship of the time-slot (TS) pulses

4-13

Location of securing screws for the A6-Main
produced by Q2159 .. .. .. ... . ... .. .. .. .. ... . 3-31

Intertace board . . . . . . . . . . . . . .. .. .. .. ... . ... 4-27
3-15

Typical encoding scheme for voltage-sensing plug-

4-14

Correct placement of power transistor and
in unit . Coding shown for deflection factor of 100

mounting hardware on rear heat sink .. .. ... . ...

4-29
microvolts . . . . . .. .. .. .. ... . ... .. .. .. .. ... .

3-33

q_15

HYPCON assembly removal and replacement . . . .

4-32
3-16

Idealized current waveforms of
(A) Row
analog

4-16

Coaxial end-lead connector assembly . . . . . . . . . .

4-34
data and (B) Column analog data . . . . . . . . . . . . . . 3-34

4_17

Exploded view of circuit-board pin and ferrule . . . . 4-35
3-17

Typical
output
waveforms for Zeros Logic and

4_18

Removal
procedure
for
push-button switches . . . .

4-36
Memory stage operation (at pin 7 of 02232) . . . . . 3-36
3-18

Readout word relating 10 possible character

5_1

Typical 7104 Photographic Writing
Rate . . . . . . . . 5-34
locations to the decimal point instructions that can

5_2

Readout display with Q2225
removed . . . . . . . . . .

5-69
be encoded ; and the resultant crt display . . . . . . .

3-38

5_3

Typical 7104 Photographic Writing Rate
. . . . . . . .

5-72
3-19

Flow chart for character generation by the
Readout System .. .. .. .. ... .. .. .. .. .. . . . . . . 3-38
REV NOV 198 5

LIST OF ILLUSTRATIONS (CONT)
The illustrations in section 8 are located near their associated
diagrams on the foldout page .
7104 Instruction
8-1

Location of circuit boards
in
the
7104 .

8-15

A1-Front Panel circuit board assembly .
8-2

Semiconductor lead configurations .

8-16

A21-Z-Axis circuit
board assembly .
8-3

A1-Front Panel circuit
board assembly
.

8-17

A22-High Voltage circuit board assembly .
8-4

A5-Mode Switch circuit board assembly .

8-18

A2-Display Control circuit board assembly .
8-5

A6-Main Intertace circuit board assembly .

8-19

A23-Inverter circuit board assembly .
8-6

A13-Logic circuit board assembly .

8-20

A24-Rectifier circuit board assembly .
8-7

A14-Trigger Selector circuit board assembly .

8-21

A25-Low-Voltage Regulator circuit board assembly .
8-SA

A15-Readout System circuit board assembly

8-22

A26-Fan Motor circuit board assembly .
(SN 8053267 & Above) .

8-23

A28-X-Y Delay Compensation circuit board assembly .
8-SB

A27-Readout Protection circuit board assembly .

8-24

7104 Troubleshooting Chart .
8-9

A15-Readout System circuit board assembly

8-25

Test Point and Adjustment Locations A .
(SN B053266 & Below) .

8-26

Test Point and Adjustment Locations B .
8-10

A1-Front Panel
circuit board assembly
.

8-27

Test Point and Adjustment Locations C .
8-11

A16-Vertical Channel Switch circuit board assembly .

8-28

Test
Point
and Adjustment Locations
D .
8-12A

A17-Vertical Amplifier circuit board assembly .

8-29

Test Point and Adjustment Locations E .
8-128

A18-Termination circuit board assembly .

8-30

Test Point and Adjustment Locations F .
8-13

A19-Horizontal Amplifier circuit
board
assembly .

8-31

Test Point and Adjustment Locations G .
8-14

A19-Horizontal Amplifier circuit board assembly .

8-32

Test Point and Adjustment Locations H .
REV NOV 198 5

V

7104 Instruction
VI
LIST
OF
TABLES
TABLE

PAGE TABLE

PAGE
NO .

NO .
1-1

Power-Cord Conductor Identification . . . . . . . . . . . .

1-2

3_g

Input/Output
Combinations for the Plug-In Binary
1-2

Power-Cord Plug Configuration . . . . . . . . . . . . . . . .
1-2

stage .. .. .. .. ... .. .. .. .. ... .. .. .. .. .. . . . . 3-17
1-3

Shipping Carton Test Strength .. .. .. .. ... .. .. ..

1-3

3-10

Input/Output Combinations for the Vertical Chopped
1-4

Electrical Characteristics . . . . . .. .. .. .. ... .. .. ..
1-3

Blanking stage . ... .. .. .. .. ... .. .. .. .. . . . . . . 3-19
1-5

Environmental Characteristics . . . . . . . . . . . . . . . . .
1-10

3_11

Standard Readout Format .. .. .. ... .. .. .. .. . . 3-27
1-6

Physical Characteristics . . . . . . . . . . . . . . . . . . . . .
1-11

3_12

Channel Address Code SN 8053266 & Below . . . . 3-32
1-7

7104 Oscilloscope
Vertical System Specification . . 1-13

3-13

Channel Address Code SN 8053267 & Above . . . 3-46
1-8

7104 Oscilloscope System
Horizontal Specification 1-14
1-9

Special Purpose
Plug-In Units . . . . . . . . . . . . . . . . 1-14

4-1

Recommended Power Supply
Troubleshooting
Sequence .
. . . . . . . . . . . . . . . . . . . . .. .. .. .. ... .. 4-8
2-1

Display Combinations . . . . . . . . . . . . . . . . . . . . . . .

2-11

4_2

Typical Power-Supply Resistance . . . . . . . . . . . . . . . 4-9
4-3

Burst Voltage Test Points . . . . . . . . . . . . . . . . . . . .

4-10
3-1

Basic Logic Reference . . . . . . . . . . . . . . . . . . . . . . .
3-5

4-4

Recommended CRT Circuitry Troubleshooting
3-2

Mode Switchinglnputs/Outputs . . . .. .. .. .. ... ..
3-9

Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-14
3-3

Input/Output Combinations
for A Lockout
(04428 Pin
14

3-11

4-5

Selected Component Criteria . . . . . . . . . . . . . . . . . 4-37
3-4

Input/Output Combinations
for B Lockout
(04428
Pin 15)
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-11

5-1

Calibration
Procedure Electives . . . . . . . . . . . . . . . . 5-1
3-5

Input/Output Combinations for Alternate Pulse

5-2

Performance Check Summary .. .. ... .. .. .. .. . .

5-3
(04428
Pin
8) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-12

5-3

Test
Equipment . .. .. ... .. .. .. .. ... .. .. .. .. . 5-13
3-6

Input/Output Combinations for Z-Axis Logic stage

3-14

5-4

Power Supply Tolerance . . . . . . . . . . . . . . . . . . . . .

5-37
3-7

Input/Output Combinations of the Horizontal
Binary

5-5

Vertical Compensation Adjustments . . . . . . . . . . . .

5-63
stage . .. .. ... .. .. .. .. ... .. .. .. ..
. . . . . . . . . 3-14
5-6A

Low-Frequency Compensation
.. .. ... .. .. .. .. . 5-64
3-8

Input/Output Combinations for the Vertical
Binary

5-6B

Low-Frequency Compensation
.. .. .. .. ... .. .. .

5-64
stage . . . . . . . . . . . . . . . . . . . . .~~~~~~~~~~~~~~~
3-16

g_1

Optionlnformation
Locator ... .. .. .. .. ... .. .. .. 6-1
REV AUG
198 6

OPERATORS
SAFETY
SUMMARY
The following
general safety information applies to
all operators and service personnel . Specific
warnings and cautions
will be found
throughout the manual
where they apply and should be followed in each
instance .
As Marked on
Equipment
TERMS
In This
Manual
CAUTION statements
identify conditions or practices that could result
in damage to the equipment or
other property .
WARNING statements
identify conditions or practices that could result
in personal injury or loss of
life .
CAUTION
indicates a personal
injury hazard not immediately accessible as one
reads the marking, or a
hazard to
property including the
equipment itself .
DANGER indicates a personal
injury hazard immediately accessible as one
reads the marking .
SYMBOLS
In This Manual
This symbol
indicates where applicable cautionary or other
information is
to be
found .
As Marked
on Equipment
DANGER-High voltage .
Power Source
This product is intended to operate
from a power source that will not apply more than 250
volts rms between the supply
conductors or between either supply
conductors and ground . A protective ground
connection, by way of the grounding
conductor
in the power cord, is essential
for safe operation .
Grounding the Instrument
WARNINGS
7104
Instruction
This instrument is grounded
through the grounding conductor of the power cord .
To avoid electrical shock, plug
the
power cord into a properly
wired receptacle before connecting to the input or
output terminals of the
instrument . A
protective ground
connection, by way of the grounding conductor in the
power cord, is essential for safe
operation .
Use the Proper
Power Cord
Use only the power cord
and connector specified for your instrument . Use
only
a
power cord that is in good
condition . For
detailed information
on power cords and connectors, see page
1-2 of this manual .
Refer cord
and connector changes to
qualified service personnel .

7104
Instruction
Use
the Proper Fuse
To
avoid fire hazard, use
only the fuse specified in the parts
list for this instrument, and
which is identical in type,
voltage
rating, and current
rating .
Refer fuse replacement
to qualified service
personnel .
Do Not Operate
in Explosive Atmosphere
To
avoid explosion, do not
operate this instrument in an atmosphere
of explosive gasses until it
has been specifically
certified
for such operation .
Do Not
Remove Panels

Covers
To
avoid personal injury, do
not remove the protective cabinet
panels or covers . Do not operate
this instrument without
the
panels or covers properly
installed .
Do Not Remove
CRT Implosion Shield
Do not remove the clear
plastic implosion shield
covering the crt faceplate . This shield
provides protection to
the operator
from crt implosion
.

Do
Not Service Alone
Use Care When Servicing With Power On
Power
Source
Crt Handling
SERVICING
SAFETY
SUMMARY
Silicone
Grease Handling
FOR QUALIFIED SERVICE PERSONNEL
ONLY
Refer also to the preceding Operators
Safety Summary
7104 Instruction
Do not perform internal service or adjustment of
this product unless another person capable of rendering first aid and'
resuscitation is present .
Dangerous
voltages exist at several points
in this product . To avoid personal injury, do not touch
exposed connections
and components
while power is on .
Disconnect power before
removing protective panels, soldering, or replacing
components .
This product is intended
to operate from a power source
that will not apply more than 250 volts rms between
the supply
conductors or
between either supply conductor
and ground . A protective ground connection by
way of the grounding
conductor
in the power cord is essential for safe
operation .
Use care
when handling a crt . Breakage of
the crt causes a high-velocity scattering of glass fragments
(implosion) .
Protective clothing
and safety glasses should
be worn . Avoid striking the crt on any object which
might cause it to crack
or implode .
When storing a crt, place
it in a protective carton or set it face down in a protected
location on a smooth
surface
with a soft mat under
the faceplate .
Handle silicone
grease with care . Avoid getting
the silicone grease in your eyes .
Wash hands thoroughly after use .

7104
Instruction
7104 Features
The
TEKTRONIX 7104
Oscilloscope is a solid-state,
wide-bandwidth instrument
designed for general-purpose
applications .
The 7104
can also be used
to observe or photograph
very fast repetitive or single shot
waveforms .
The
7104 accepts Tektronix
7000-series plug-in units
; the flexibility of the plug-in
feature and variety of
plug-in units
available
allows the system
to be used for many
measurement applications . The
left pair of plug-in
compartments are
for
vertical
deflection and
the right pair are for
horizontal deflection . Electronic
switching between each
pair will produce
multitrace vertical
and/or horizontal displays .
2314-43

INTRODUCTION
OPERATORS MANUAL
INSTRUCTION MANUAL
GENERAL INFORMATION
The Operators
Manual is divided into the following three

Section
7-Replaceable Electrical Parts contains in
sections :

formation necessary
to order replaceable parts and
assemblies
related to the electrical functions of the
Section
1-General Information contains instrument

instrument .
description, electrical
specifications, environmental
characteristics, standard
and recommended

Section 8-Diagrams
and Circuit Board Illustrations
accessories, installation,
and packaging for shipment

includes detailed
circuit schematics, locations of
instructions .

assembled boards
within the instrument, voltage and
waveform
information, circuit board component
Section 2-Operating
Instructions contain information

locators, and
locations of adjustments to aid in the
relative to operating
and checking the instrument

performing of the Adjustment and Performance Check
operation .

portion of the Calibration procedure .
Section 3-Instrument
Options contains a description

Section 9-Replaceable
Mechanical Parts includes in-
of available options
and gives the location of the

formation necessary to
order replaceable mechanical
incorporated
information for those options .

parts and shows
exploded drawings which identify
assemblies .
The first two sections of
the Instruction Manual contain
operating instructions
which are identical to the first two

INSTALLATION
sections of the
Operators Manual .
This instrument was inspected both mechanically
and
WARNING

electrically before shipment . It should be free of mars or
scratches and should meet or
exceed all electrical
THE
REMAINING

PORTIONS

OF

THE

specifications . To
confirm this, inspect the instrument for
lNSTRUCTlONMANUAL
CONTAlNSERVlClNG

Physical damage
incurred in transit and test the electrical
INSTRUCTIONS . THESE
SERVICING

Performance by
following the Operators Checkout
INSTRUCTIONS ARE FOR USE
BY QUALIFIED

Procedure
in Section 2, Operating Instructions
. Verify
SERVICE PERSONNEL
ONLY . T O AVOID

Performance Requirements by referring a qualified
ELECTRIC SHOCK OR
OTHER PERSONAL

service person to the servicing sections of the
Instruction
INJURY, DO
NOT PERFORM ANY SERVICING

Manual . If there is damage or
deficiency, contact your
OTHER
THAN THAT DESCRIBED IN THE

local Tektronix Field
Office or representative .
OPERATING
INSTRUCTIONS UNLESS YOU
ARE
QUALlflED TO DO SO .
Section 3-Theory of Operation
contains basic and
general circuit analysis
that may be useful for
servicing or
operating the instrument .
Section
4-Maintenance describes routine and cor-
rective maintenance procedures with detailed
instructions for replacing
assemblies, subassemblies,
and individual components .
INITIAL
INSPECTION
Section 1-7104
Section 6-Instrument Options
contains a description
of available options
and locations of incorporated
information for those
options .
OPERATING-POWER
INFORMATION
This instrument can
be operated from either a 115-volt or
230-volt nominal supply source, 48
to 440 hertz . The line
fuse remains
the same for both 115-volt and 230-volt
operation .
CA
UTION
Section 5-Calibration
contains procedures to check

To
prevent damage to the instrument a/ways
the

operational

performance

and electrical

check
the LINE VOLTAGE SELECTOR switch
characteristics of
the instrument . Procedures also

located on the
rear of the instrument before
include
methods
for adjustment of the instrument to

connecting the instrument to the supply
meet
specifications .

circuit .

General Information-7104
WARNING
AC POWER SOURCE
AND CONNECTION .
This instrument
operates from a single-phase
power source .
It has a three-wire power cord
and
two-po% three-terminal
grounding-type
plug . The voltage to ground
(earth) from either
po% of
the power source must not exceed
the
maximum rated operating
voltage, 250 volts .
Before making connection
to the power
source, determine
that the instrument is
adjusted to match the voltage of
the power
source, and has a
suitable two-po% three-
terminal
grounding-type plug . Refer any
changes to qualified
service personne%
GROUNDING .
This instrument is safety class
l
equipment (lEC designation)
. All accessible
conductive parts are
directly connected
through the grounding
conductor of the
power cord to
the grounding contact of the
power plug .
The power
input plug must only be inserted in
a
mating receptac% with a grounding
contact .
Do not defeat the
grounding connection . Any
interruption of the grounding
connection can
create an electric shock
hazard .
Conductor

~

Color

~ Alternate Color
Ungrounded (Line)

~ Brown

~ Black
Grounded (Neutral)

~ Blue

~ White
Grounded
(Earthing) ~ Green-Yellow ~
Green-Yellow
230 V AC
TABLE
1-2
Power-Cord
Plug Configuration
Nominal Line
Voltage

~

Reference Standards
115VAC
'ANSI C73 .11
2 NEMA 5-15-P
31EC 83
'ANSI C73 .20
2 NEMA 6-15-P
3 1EC 83
° BS 1363
B CEE 7,
sheets IV, VI, & VII
B AS C112
'ANSI-American National
Standards Institute
2 NEMA-National
Electrical Manufacturer's Association
3 1EC-Intemational
Electrotechnical Commission
4 8S-British Standards
Institution
S CEE-Intemational
Commission on Rules for the Approval of
Electrical
Equipment
B AS-Standards
Association of Australia
For electric shock protection,
the grounding
connection must be
made before making
connection to the
instrument's input or

OPERATING
VOLTAGE
output terminals .

The
LINE VOLTAGE
SELECTOR switch (located on the
rear
panel) allows
selection of 115-volt or 230-volt
nominal
line voltage operation . To convert from 115-volt
to 230-volt
operation, change the power cord
and plug to
match
the power-source receptacle,
then use a small
screwdriver to move the LINE
VOLTAGE SELECTOR
TABLE 1-1

switch to the desired range .
The line fuse remains the
Power-Cord Conductor
Identification

same for both 115-volt
and 230-volt operation .
OPERATING TEMPERATURE
The 7104 can be
operated where the ambient air
temperature is
between
0°
and +50° C and can be stored
in ambient
temperatures from -55° to +75° C . After
storage at
temperatures outside the operating
limits,
allow the chassis temperature to reach
a safe operating
limit before applying power
.
The 7104 is cooled by
air drawn in through holes in the
top,
side, and bottom panels
and blown out through the
fan exhaust . To ensure
proper cooling of the instrument,
maintain the clearance
provided by the feet on the
bottom and
allow at least 2 inches clearance (more
if
possible)
at the top, sides, and rear of the instrument
.
The power-cord plug required
depends upon the ac input

OPERATING POSITION
voltage and the
country in which the instrument is to be
used . Should you
require a power-cord plug other than

A bail-type stand, mounted on
the bottom of the
that supplied with
your instrument, refer to the standards

instrument, permits the
instrument to be tilted up about
listed in
Table 1-2 .

10° for more convenient
crt viewing .

PACKAGING FOR SHIPMENT
If this instrument is to be shipped for long distances by
'

commercial transportation,
it
is
recommended that the
instrument be
packaged in the original manner . The
carton and packaging
material in which your instrument
was
shipped should be saved and used for this purpose .
Also,
if this instrument is to be shipped to a Tektronix
Service Center for service or repair, attach a tag to the
instrument
showing the following : Owner of the
instrument
(with address), the name of a person at your
firm who can be contacted,
complete instrument type
and
serial number,
and
a
description
of
the service
required
.
If the original packaging is unfit
for
use or
not
available,
package the instrument as follows :
Gross Weight (Ib)

~

Carton Test Strength (Ib)
1 . Obtain a corrugated cardboard
shipping carton having
inside dimensions
at least six inches greater than the

0-10
instrument dimensions ; refer to Table 1-3 for carton test

10-30
strength requirements .
30-120
2 . Enclose
the instrument with polyethylene sheeting or
equivalent
to protect the finish of the instrument .

120-140
The electrical characteristics listed in Table
1-4
apply
when
the
following conditions are met : (1) Calibration of
the
instrument
must have taken place at an ambient temperature between
+2p°
and +30° C, (2) the instrument must be
allowed a
20-minute warm-up
period,
(3) all
specifications are valid at an ambient temperature of 0° to +50° C,
unless
otherwise stated,
(4) the instrument must be in an environment that meets the limits described in Table 1-5 .
Any applicable conditions not listed above are expressly stated as part of that characteristic .
Environmental
characteristics are listed in Table 1-5 and Physical characteristics are listed in Table 1-6 .
Deflection
Factor
Characteristic
Difference Between Vertical Compartments
Low-Frequency Linearity
Frequency Response
Step Response
Risetime (10 to 90°k),
with 7A29
Amplifier
Unit
REV B SEP 1980
SPECIFICATION
TABLE 1-4
Electrical Characteristics
VERTICAL
SYSTEM
General Information-71 p4
3 . Cushion
the instrument on all sides by tightly packing
dunnage or urethane foam between the carton and the
instrument, allowing three inches on each side .
4 . Seal the carton with shipping tape or with an
industrial stapler .
5
.
Mark the address of the Tektronix Service Center and
your return address on the carton
in
one or more
prominent locations .
1 °~ or less .
TABLE 1-3
Shipping Carton Test Strength
Performance Requirement
Compatible with all 7000-series plug-in units .
200
275
375
500
0 .1 div or less compression or expansion of
a center-screen
2-div display positioned anywhere vertically
within the
graticule area .
Varies with plug-in unit selected . See 7104 Oscilloscope
Vertical Systems Specification, Table 1-7 .
350 ps
or less (calculated from bandwidth) .

General Information-7104
Isolation Between
Vertical Compartments
(8 division
signal)
Delay
Line
Vertical Display Modes
LEFT, RIGHT, ALT Modes
Difference in Signal Delay Between
Vertical Compartments
LEFT
ALT
ADD
CHOP
Repetition Rate
RIGHT
"Staved ALT"
Characteristic
VERT TRACE SEPARATION (B)
TABLE 1-4 (CONT .)
Electrical Characteristics
At least 160 :1
from do to 100 MHz and at least 80 :1
from
100
MHz to 1 GHz .
Permits viewing leading edge of triggering signal
.
7850-series time-base units will not display
leading
edge of the trigger signal in 7104 (except
7B50A) .
50 ps or
less .
Performance Requirement
Selected by front-panel VERTICAL MODE
switch .
Left vertical-unit displayed .
NOTE
Display
alternates between left and right vertical units at
a
rate
determined
by the horizontal plug-in unt(s) .
Display is algebraic sum of
left and right vertical units .
Display chops between
Left and Right vertical units
asynchronously
to horizontal plug-in unit(s) .
1 MHz within 20% .
Right vertical unit displayed
.
Slaved operation occurs if : (1) VERT MODE
switch set
to ALT, (2) HORIZ MODE switch set to
ALT or CHOP,
(3) time-base unit is installed in each
horizontal compartment
and (4) time-base unit installed in A
HORIZ compartment
operates in Independent mode .
When in slaved operation the display
alternates between :
(1) trace produced by LEFT VERT unit
displayed at sweep
rate of B time-base unit and (2)
trace produced by RIGHT
VERT unit displayed at sweep rate of
A time-base unit .
NOTE
VERT TRACE SEPARATION
(BJ control is inoperative
in "Slaved ALT" Mode
.
Positions "B" trace at least
4 div above and below "A"
trace, when 7104 operates
in ALT or CHOP horizontal
modes . See note
concerning "Slaved ALT" vertical mode .
REV A SEP 1979

Deflection
Factor
Gain Difference
Between Horizontal
Compartments
DC Linearity
Fastest Calibrated
Sweep Rate
Horizontal
Display Modes
A
ALT
CHOP
B
Chopped Mode
Repetition
Rate
Bandwidth
REV A SEP 1979
Characteristic
Phase Shift Between
Vertical and
Horizontal
Deflection
Systems
Option 2 (B
HORIZ compartment
only)
with 7A19s or
7A29s, at least one
of which
has the
variable delay option
TABLE 1-4 (CONT .)
Electrical Characteristics
TRIGGERING
Performance
Requirement
General
Information-7104
A and B TRIGGER SOURCE

I
Selected by front-panel
switches . Lights behind
pushbuttons
are illuminated to indicate
trigger source .
VERT MODE

The trigger source is
controlled by vertical
display mode
selection .
Source (sources) is (are)
shown by the
illumination
of
the
LEFT and RIGHT trigger source
buttons . Source
follows (is
same as) the vertical
display with the
following
two
exceptions :
VERT MODE

~

Trigger Source
CHOP ~
LEFT
"Slaved ALT"

~

RIGHT
for A TRIGGER
f

LEFT
for B TRIGGER
See Vertical Display
Modes for slaved
operation .
LEFT

Trigger source : LEFT
vertical unit . LEFT
trigger source
button illuminated
.
RIGHT

Trigger source
: RIGHT vertical unit . RIGHT
trigger source
button
illuminated .
HORIZONTAL
SYSTEM
Compatible with all
7000-series plug-in units
.
1 % or less .
0 .05 division or less
error at each
graticule line after
adjusting for no
error at second and
tenth graticule
lines .
200
ps/div . (See 7104
Horizontal System Specs ., Table 1-8 .)
Selected
by front-panel HORIZONTAL
MODE switch
.
A horizontal unit displayed
.
Display
alternates between A and
B horizontal units .
Display chops
between A and B horizontal
units
.
B horizontal unit
displayed .
200 kHz
within
20%
.
2° or less from
do to at least 50 kHz
.
2° or less from do
to 50 MHz after adjusting variable delay
for
balance at 35
MHz . Phase balance can be
obtained at any
frequency
up to 250 MHz .
350 MHz

General Information-7104
X-Y Displays
Waveshape
Polarity
Output Resistance
Output Voltage
Into 100
kf2 or greater
Into 50 O
Output Current
Amplitude Accuracy
(P-P Voltage)
Repetition
Rate
Duty Factor
Rise
Time and Fall Time
+SAWTOOTH OUT
Source
Polarity
Output Voltage
Rate of
Rise
Into
50 O
Into 1 Mfg
Output Resistance
+GATE
Source
Characteristic
TABLE 1-4 (CONT .)
Electrical Characteristics
CALIBRATOR
Square wave .
450 f2 .
40
mV,
0 .4
V, 4V .
4 mV, 40 mV, 0 .4 V .
Within 1 % .
1 kHz within 0 .25%
.
49 .8% to 50
.2% .
SIGNAL OUTPUTS
Approximately 950 !Z .
Performance Requirement
X-Y displays can
only be obtained in
conjunction with a
time-base
unit . With an amplifier unit
installed in the
A(B)
horizontal compartment the Z-axis
can only be controlled
by the
time-base unit in the B(A)
horizontal compartment .
This is independent of the
horizontal mode switch
selection .
Positive going, with baseline
near 0 volt .
(Selected
by front-panel CALIBRATOR
switch .)
40 mA available through
CALIBRATOR output
with optional
bnc-to-Current Loop adapter .
CALIBRATOR must be
set to
4 V for calibrated output .
500 ns or less
into 100 pF or less .
Selected by
front-panel switch .
A : A
HORIZ time-base unit .
B :
B HORIZ time-base unit .
Positive-going with baseline
at
0
V within 1 V into
1 Mfl .
50
mV/unit of time selected by
time-base unit time/div
switch, within 15%, 100 ns/div
maximum sweep rate .
1 V/unit of time selected by the
time-base unit time/div
switch, within 10% ; 1 ps/div
maximum sweep rate .
Selected by front-panel
switch .
A : A Gate, derived from
A HORIZ time-base
unit main gate .
B : B Gate, derived from
B HORIZ time-base
unit main gate .

+GATE
(continued)
Polarity
Output Voltage
Into 50 f2
Into
1 Mfg
Rise Time Into 50 f2
Fall Time Into 50 f2
Output Resistance
SIG OUT
So u rce
Output Voltage
Into 50
f2
Into 1 Mfg
Bandwidth Into 50
f2
DC
Centering
Aberrations
Output Resistance
Readout Modes
Free-Run (Not Labeled)
PULSED
REV NOV 1986
Pulse Source
Characteristic
TABLE 1-4 (CONT .)
Electrical Characteristics
Performance
Requirement
General Information-7104
Positive-going with baseline at 0 V within 1 .0
V into 1 Mfg .
0 .5
V within
10% .
10 V within 10% (up to 1 ps/div sweep rate) .
5 ns or less .
15 ns or less
.
Approximately 950
f2 .
Selected by B TRIGGER SOURCE
switch .
Same as B TRIGGER SOURCE .
25 mV/div of vertical
deflection within 25% .
For
a
maximum output of ±2 V : 0 .5 V/div of vertical deflection
within 25% .
Varies with vertical
plug-in selected ; see 7104-series
Oscilloscope Systems
Specification .
0V
within 1 V into 1 Mfg .
25% or less p-p
within
50 ns
of step .
Approximately 950 f2 .
READOUT DISPLAY
Continuously displayed .
Single-shot operation .
Selected by front-panel switches .
+GATE : Triggered by the trailing edge of
the +GATE selected
by the front-panel switch .
EXT : Controlled through rear-panel
remote control connector .
MAN : Manual trigger, independent
of other pulse sources .