Tektronix 7623A User manual

Tektronix

COMMITTED

EXCELLENCE

7623A/R7623A

STORAGE

OSCILLOSCOPE

WITH

OPTIONS

SERVICE

INSTRUCTION

MANUAL

WARRANTY

TEKTRONIX

insiruments

are

warranted

against

defective

materials

and

workmanship

for

one

year.

Any

questions

with

respect

the

warraniy

should

taken

with

your

TEK

TRONIX

Field

Engineer

representative.

requests

for

repairs

and

replacement

parts

should

directed

the

TEKTRONIY

Field

Office

representative

your

area.

This

will

assure

you

the

fastest

possible

service.

Please

include

the

instrument

Type

Number

Part

Number

and

Serial

Number

with

all

requests

for

parts

service.

Specifications

and

price

change

privileges

reserved.

1974

Tektronix,

Inc.,

Beaverton,

Oregon.

Printed

the

United

States

America.

All

rights

reserved.

Contents

this

publication

may

not

reproduced

any

torm

without

permission

Tektronix,

Inc.

ULS.A.

and

foreign

TEKTRONIX

producis

covered

U.S.

and

foreign

patents

and/or

patenis

pending.

TEKTRONIX

registered

trademark

Tektronix,

inc.

7623A/R7623A

Service

TABLE

CONTENTS

LIST

ILLUSTRATIONS

LIST

TABLES

PAGE

SECTION

OPERATING

INFORMATION

PRELIMINARY

OPERATION

1-1

POWER

SOURCES

1-1

POWER

CORD

1-1

OPERATING

VOLTAGE

1-1

OPERATING

TEMPERATURE

1-3

RACKMOUNTING

1-3

PLUG-IN

UNITS

1-4

PLUG-IN

INSTALLATION

AND

REMOVAL

1-4

CONTROLS

AND

CONNECTORS

1-5

FRONT

PANEL

CONTROLS

AND

CONNECTORS

1-6

REAR

PANEL

CONTROLS

AND

CONNECTORS

1-8

GENERAL

OPERATING

INFORMATION

1-10

INTENSITY

CONTROL

1-10

DISPLAY

FOCUS

1-10

GRATICULE

1-10

LIGHT

FILTER

1-11

BEAMFINDER

1-11

READOUT

MODES

1-12

DISPLAY

PHOTOGRAPHY

1-12

STORAGE

1-13

CARE

STORAGE

SCREEN

1-14

VERTICAL

MODE

1-15

TRIGGER

SOURCE

1-16

X-¥

OPERATION

1-17

INTENSITY

MODULATION

1-17

RASTER

DISPLAY

1-18

CALIBRATOR

1-18

SIGNALS

OUT

1-19

APPLICATIONS

1-20

SECTION

SPECIFICATIONS

INTRODUCTION

2-1

STANDARD

ACCESSORIES

2-9

7623A/R7623A

Service

SECTION

TABLE

CONTENTS

(cont.)

THEORY

OPERATION

LOGIC

FUNDAMENTALS

SYMBOLS

LOGIC

POLARITY

INPUT/OUTPUT

TABLES

NON

DIGITAL

DEVICES

BLOCK

DIAGRAM

THEORY

OPERATION

MAIN

INTERFACE

LOGIC

CIRCUIT

Z-AXIS

LOGIC

CLOCK

GENERATOR

VERTICAL

CHOPPED

BLANKING

CHOP

COUNTER

VERTICAL

MODE

CONTROL

VERTICAL

BINARY

PLUG-IN

BINARY

OUTPUT

BUFFERS

TRIGGER

SELECTOR

©@>

TRIGGER

MODE

AND

ADD

SIGNALS

TRIGGER

CHANNEL

SWITCH

TRIGGER

OUTPUT

AMPLIFIER

VERTICAL

SIGNAL

BUFFER

VERTICAL

INTERFACE

VERTICAL

CHANNEL

SWITCH

AUXILIARY

Y-AXIS

INPUT

AMPLIFIER

DELAY-LINE

BUFFER

DELAY

LINE

VERTICAL

AMPLIFIER

<@>

CENTERING

AND

READOUT

AMPLIFIER

INPUT

AMPLIFIER

BEAMFINDER

NETWORK

OUTPUT

AMPLIFIER

HORIZONTAL

AMPLIFIER

<6>

HORIZONTAL

CHANNEL

SWITCH

RIGHT

OUTPUT

AMPLIFIER

LEFT

OUTPUT

AMPLIFIER

PAGE

3-2

3-5

3-9

3-11

3-12

3-15

3-17

3-18

3-20

3-21

3-23

3-24

3-25

3-26

3-27

3-28

3-29

3-30

7623A/R7623A

Service

TABLE

CONTENTS

(cont.)

PAGE

OUTPUT

SIGNALS

3-31

VERT

SIG

OUT

3-31

GATE

OUT

3-31

SAWTOOTH

OUT

3-31

CRT

CIRCUIT

<7>

3-31

HIGH

VOLTAGE

REGULATION

3-31

AUTO

FOCUS

RESTORER

3-33

AUTO

FOCUS

3-34

CONTROL

GRID

RESTORER

3-34

Z-AXIS

AMPLIFIER

3-34

CRT

CONTROL

CIRCUITS

3-35

LOW-VOLTAGE

POWER

SUPPLY

3-35

POWER

INPUT

3-35

—50-VOLT

SUPPLY

3-38

—-15-VOLT

SUPPLY

3-40

+5-VOLT

SUPPLY

3-40

+15-VOLT

SUPPLY

3-40

+50-VOLT

SUPPLY

3-40

+130-VOLT

SUPPLY

3-40

GRATICULE

LIGHT

SUPPLY

3-41

CALIBRATOR

3-41

READOUT

SYSTEM

3-43

INTRODUCTION

3-43

THREE-COMPARTMENT

MAINFRAMES

3-43

DISPLAY

FORMAT

3-44

DEVELOPING

THE

DISPLAY

3-44

TIMER

3-51

TIME-SLOT

COUNTER

3-53

WORD

TRIGGER

3-54

CHANNEL

COUNTER

3-54

READOUT

CONTROL

3-54

SINGLE-SHOT

LOCKOUT

3-55

ENCODING

THE

DATA

3-56

COLUMN

AND

ROW

DATA

SWITCHES

3-59

DISPLAY-SKIP

GENERATOR

3-60

COLUMN

AND

ROW

DECODERS

3-60

ZEROS

LOGIC

AND

MEMORY

3-61

7623A/R7623A

Service

TABLE

CONTENTS

(cont.)

PAGE

CHARACTER

GENERATORS

3-64

DECIMAL

POINT LOGIC

AND

CHARACTER

POSITION

COUNTER

3-64

FORMAT

GENERATOR

3-65

Y-OUTPUT

AMPLIFIER

3-67

X-OUTPUT

AMPLIFIER

3-67

DISPLAY

SEQUENCE

3-67

STORAGE

SYSTEM

3-68

Loic

3-68

OPERATIONAL

AMPLIFIERS

3-73

SECTION

MAINTENANCE

PRELIMINARY

INFORMATION

PANEL

REMOVAL

4-4

POWER

UNIT

REMOVAL

4-2

PREVENTIVE

MAINTENANCE

CLEANING

4-3

LUBRICATION

4-4

VISUAL

INSPECTION

SEMICONDUCTOR

CHECKS

RECALIBRATION

TROUBLESHOOTING

AIDS

4-5

TROUBLESHOOTING

EQUIPMENT

TROUBLESHOOTING

TECHNIQUES

4-8

CORRECTIVE

MAINTENANCE

4-13

OBTAINING

REPLACEMENT

PARTS

4-13

SOLDERING

TECHNIQUES

4-13

COMPONENT

REPLACEMENT

4-14

SEMICONDUCTOR

REPLACEMENT

4-18

CATHODE-RAY

TUBE

REPLACEMENT

4-20

SWITCH

REPLACEMENT

4-21

GRATICULE-BULB

REPLACEMENT

4-22

POWER

TRANSFORMER

REPLACEMENT

4-22

HIGH

VOLTAGE

COMPARTMENT

4-22

FUSE

REPLACEMENT

4-23

RECALIBRATION

AFTER

REPAIR

4-23

INSTRUMENT

REPACKAGING

4-23

7623A/R7623A

Service

TABLE

CONTENTS

(cont.)

SECTION

PERFORMANCE

CHECK/CALIBRATION

PRELIMINARY

INFORMATION

CALIBRATION

INTERVAL

TEKTRONIX

FIELD

SERVICE

USING

THIS

PROCEDURE

TEST

EQUIPMENT

REQUIRED

SPECIAL

CALIBRATION

FIXTURES

CALIBRATION

EQUIPMENT

ALTERNATIVES

SIGNAL

CONNECTIONS

WARM-UP

AND

TEMPERATURE

REQUIREMENTS

PART

I--PERFORMANCE

CHECK

INTRODUCTION

OUTLINE

FOR

PART

I-PERFORMANCE

CHECK

PART

H—CALIBRATION

INTRODUCTION

OUTLINE

FOR

PART

II--CALIBRATION

SECTION

OPTIONS

SECTION

ELECTRICAL

PARTS

LIST

SECTION

DIAGRAMS

SECTION

MECHANICAL

PARTS

LIST

CHANGE

INFORMATION

PAGE

5-1

5-2

5-6

5-26

7623A/R7623A

Service

LIST

ILLUSTRATIONS

Frontispiece

Figure

1-1.

Location

voltage-selector

jumper.

Figure

1-2.

Front

panel

controls

and

connectors.

Figure

1-3.

Rear

panel

controls

and

connectors.

Figure

1-4.

Definition

measurement

lines

the

graticule.

Figure

1-5.

Location

Readout

Mode

switch.

Figure

1-6.

Location

Calibrator

jumper

Storage

circuit

board.

Figure

3-1.

Block

diagram

7623A.

Figure

3-2.

Logic

circuit

block

diagram.

Figure

3-3.

Z-Axis

logic

block

diagram.

Figure

3-4.

(A)

Clock

Generator

stage

U55A.

(B)

Idealized

waveforms

from

Clock

Generator

stage.

Figure

3-5.

(A)

Input

and

output

pins

for

Vertical

Chopped

Blanking

stage.

(B)

idealized

waveforms

for

Vertical

Chopped

Blanking

stage.

Figure

3-6.

(A)

Logic

diagram

for

Vertical

Chopped

Blanking

stage.

(B)

Table

input/output

combinations

for

Vertical

Chopped

Blanking

stage.

Figure

3-7.

Detailed

togic

diagram

Chop

Counter

stage.

Figure

3-8.

Idealized

input

and

output

waveforms

for

Chop

Counter

stage

Figure

3-9.

Logic

diagram

Vertical

Mode

Control

and

Vertical

Mode

Buffer

Amplifier

stages.

Figure

3-10.

Logic

diagram

Vertical

Binary

stage.

Figure

3-11.

Idealized

waveforms

showing

relationship

between

input

and

output

waveforms

for

Vertical

Binary

and

Plug-In

Binary

stages

when

operating

ALT

mode.

Figure

3-12.

Logic

diagram

Plug-In

Binary

and

Plug-In

Alternate

Buffer

stage.

Figure

3-13.

Detailed

block

diagram

Trigger

Selector

circuit

along

with

simplified

diagram

trigger

source

selection

circuitry.

Figure

3-14.

Input

levels

U324.

Figure

3-15.

Input/output

table

for

Trigger

Channel

Switch

stage.

Figure

3-16.

Vertical

Interface

detailed

block

diagram.

Figure

3-17.

Input/output

table

for

Vertical

Channel

Switch.

Figure

3-18.

Vertical

Amplifier

detailed

block

diagram.

Figure

3-19.

Horizontal

Amplifier

detailed

block

diagram.

Figure

3-20.

CRT

circuit

detailed

block

diagram.

Figure

3-21.

Low-Voltage

Power

Supply

detailed

block

diagram.

Figure

3-22.

Schematic

illustrating

voltage

drop

between

power

supply

output

and

load

due

resistance

interconnecting

wire.

Figure

3-23.

Calibrator

detailed

block

diagram.

Figure

3-24.

Location

readout

words

the

crt

identifying

the

originating

plug-in

unit

and

channel

(one

complete

frame

shown).

PAGE

1-2

1-5

1-9

1-11

1-13

1-20

3-8

3-10

3-11

3-16

3-17

3-19

3-20

3-21

3-22

3-23

3-24

3-25

3-26

3-27

3-29

3-32

3-36

3-39

3-41

3-44

7623A/R7623A

Service

LIST

ILLUSTRATIONS

(cont.)

PAGE

Figure

3-25.

Character

Selection

Matrix

for

7623A

Readout

System.

3-46

Figure

3-26.

Typical

readout

display

where

only

channel

the

Right

Vertical

and

3-47

Horizontal

units

displayed.

Figure

3-27.

Detailed

block

diagram

the

Readout

System.

3-48

Figure

3-28.

Output

waveforms

Timer

stage.

3-50

Figure

3-29,

Detail

output

pins

12, 13, 14,

and 16

U2126.

3-51

Figure

3-30.

Timer

stage

operation

when

Display-Skip

condition

occurs.

3-52

Figure

3-31.

Time

relationship

the

time-slot

(TS)

pulses

produced

U2159.

3-53

Figure

3-32.

Typical

encoding

scheme

for

voltage-sensing

amplifier

plug-in

unit.

Coding

3-57

shown

for

deflection

factor

100

microvolts.

Figure

3-33.

Idealized

current

waveforms

of:

(A)

Row

analog

data,

(B)

Column

analog

data.

3-58

Figure

3-34.

Block

representation

memory

sequence

U2232.

3-61

Figure

3-35.

Typical

output

waveforms

for

Zeros

Logic

and

Memory

stage

operation

(at

3-62

U2232).

Figure

3-36.

Readout

word

relating

possible

character

locations

the

decimal

point

3-65

instructions

that

can

encoded,

and

the

resultant

crt

display.

Figure

3-37.

Flow

chart

for

character

generation

the

Readout

System.

3-66

Figure

3-38.

Storage

circuit

simplified

block

diagram.

3-68

Figure

3-39.

Time

relationship

Storage

logic

pulses.

3-69

Figure

3-40.

BISTABLE

mode

Storage

waveforms.

3-70

Figure

3-41.

VAR

PERSIST

mode

Storage

waveforms.

3-71

Figure

3-42.

FAST

BISTABLE

mode

Storage

waveforms.

3-72

Figure

3-43.

FAST

VAR

PERSIST

made

Storage

waveforms.

3-74

Figure

4-1.

Power

Unit

removal.

4-2

Figure

4-2.

Location

circuit

boards

the

7623A.

Figure

4-3.

Location

circuit

boards

the

R7623A.

4-7

Figure

4-4.

Circuit

isolation

troubleshooting

chart.

4-10

Figure

4-5.

Location

screws

holding

Low

Voltage

sub-chassis.

4-17

Figure

4-6.

Location

screws

holding

Signals

Out

rear

panel.

4-18

Figure

5-1.

Typical

crt

display

when

checking

X-Y

phase

shift.

5-15

Figure

5-2.

Location

Calibrator

AC/DC

jumper. 5-17

Figure

5-3.

Location

High-Voltage

Test

Point.

5-30

Figure

5-4.

Location

adjustments

High-Voltage

cover.

5-32

Figure

5-5.

Typical

crt

display

when

checking

X-Y

phase

shift.

5-43

Figure

5-6.

Location

Calibrator

AC/DC

jumper.

5-46

vii

7623A/R7623A

Service

LIST

ILLUSTRATIONS

(cont.)

Section

figures

are

located

near

their

associated

diagrams

the

foldout

pages.

Figure

8-1.

Figure

8-2.

Figure

8-3.

Figure

8-4.

Figure

8-5.

Figure

8-6.

Figure

8-7.

Figure

8-8.

Figure

8-9.

Figure

8-10.

Figure

8-11.

Figure

8-12.

Figure

8-13.

Figure

8-14.

Figure

8-15.

Figure

8-16.

Figure

8-17.

Figure

8-18.

Figure

8-19.

Figure

8-20.

Figure

8-21.

Figure

8-22.

Figure

8-23.

Figure

8-24.

viii

Semiconductor

lead

configurations.

A1-Main

Interface

Board.

A2-Logic

Board.

A3-Trigger

Selector

Board.

A4-Vertical

Interface

Board.

A5-Vertical

Amplifier

Board

(front).

A5-Vertical

Amplifier

Board

(rear).

A6-Horizontal

Amplifier

Board.

A7-Output

Signals

Board.

A8-Z-Axis

Board.

A9-Anode

Board.

A10-High-Voltage

Board.

A11-Low-Voltage

Rectifier

Board.

A12-Low-Voltage

Regulator

Board.

A13-Readout

Board.

A14-Storage

Board.

Adjustment

locations-Low-Voltage

Regulator

board.

Adjustment

locations-Z-Axis

board.

Adjustment

locations-High-Voltage

board.

Adjustment

locations-Vertical

Amplifier

board.

Adjustment

locations-Horizontal

Amplifier

board.

Adjustment

locations-Signals

Out

board.

Adjustment

locations-Readout

board,

Adjustment

locations-Storage

board.

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