Tektronix 7704A User manual

genase

Tektronix,

Inc.

P.O.

Box

500

Beaverton,

Oregon

97005

070-1260-00

TEKTRONIX

INSTRUCTION

MANUAL

Serial

Number

locce

373

€

uid

privileges

merica.

All

rights

reserved.

Contents

this

publication

may

not

reproduced

any

___

form

without

permission

Tektronix,

Inc.

Nese”

SECTION

TABLE

CONTENTS

TABLE

CONTENTS

LIST

ILLUSTRATIONS

LIST

TABLES

OPERATING

INFORMATION

PRELIMINARY

INFORMATION

Operating

Voltage

CONTROLS

AND

CONNECTORS

CIRCUIT

DESCRIPTION

BLOCK

DIAGRAM

Block

Diagram

Description

CIRCUIT

OPERATION

LOGIC

FUNDAMENTALS

Symbols

Logic

Polarity

Input/Output

Tables

Non-Digital

Devices

CALIBRATOR

AND

ERONT

PANEL

<1»

MAIN

INTERFACE

LOGIC

CIRCUIT

TRIGGER

SELECTOR

VERTICAL

INTERFACE

HORIZONTAL

INTERFACE

OUTPUT

SIGNALS

INVERTER/RECTIFIERS<8>

LOW-VOLTAGE

REGU

ATORS>

READOUT

SYSTEM

MAIN

INTERCONNEC

VERTICAL

AMPLIFIER

HORIZONTAL

AMPLIFIER

CRT

CIRCUIT

MAINTENANCE

Panel

Removal

Power-Unit

Removal

PREVENTIVE

MAINTENANCE

Cleaning

Lubrication

Visual

Inspection

Semiconductor

Checks

Recalibration

TROUBLESHOOTING

Troubleshooting

Equipment

Troubleshooting

Techniques

7704A

Service

Page

1-1

2-1

2-3

2-6

2-7

2-9

2-25

2-28

2-30

2-31

2-33

2-37

2-39

2-55

2-57

2-58

2-59

3-1

3-2

3-3

7704A

Service

TABLE

CONTENTS

(cont)

Page

Special

Adjustment

Procedures

3-5

CORRECTIVE

MAINTENANCE

Soldering

Techniques

3-10

Component

Replacement

3-10

Recalibration

After

Repair

3-19

Instrument

Repackaging

3-19

SECTION

CALIBRATION

Calibration

Interval

4-1

Tektronix

Field

Services

4-1

Using

This

Procedure

4-1

TEST

EQUIPMENT

REQUIRED

4-1

Special

Calibration

Fixtures

4-1

Calibration

Equipment

Alternatives

4-1

Signal

Connections

4-2

CALIBRATION

PROCEDURE

Index

Calibration

Procedure

4-3

Preliminary

Procedure

for

Calibration

4-4

POWER

SUPPLY

4-5

Z-AXIS

AND

DISPLAY

4-7

VERTICAL

SYSTEM

4-10

TRIGGERING

4-14

HORIZONTAL

SYSTEM

4-16

CALIBRATOR

4-19

OUTPUT

SIGNALS

4-21

READOUT

SYSTEM

4-23

SECTION

ELECTRICAL

PARTS

LIST

SECTION

DIAGRAMS

AND

CIRCUIT

BOARD

ILLUSTRATIONS

Symbols

and

Reference

Designators

SECTION

MECHANICAL

PARTS

LIST

CHANGE

INFORMATION

Number

1-1

1-2A

1-2B

2-1

2-2

2-3

2-4

2-6

2-7

aoe

2-9

2-10

2-11

2-12

2-17

2-18

2-20

)

2-21

7704A

Service

LIST

ILLUSTRATIONS

Frontispiece

Line

Selector

assembly

rear

panel!

(shown

with

cover and

fuses

removed).

7704A

front-panel

controls

and

connectors.

7704A

rear-panel

controls

and

connectors.

7704A

block

diagram.

Calibrator

circuit

detailed

block

diagram.

Block

diagram

Logic

Circuit.

Breakdown

separate

stages

within

Horizontal

Logic

(U2573)

showing

inputs

and

outputs

for

each

stage.

(A)

Logic

diagram

for

Sweep

Lockout

stage;

(B)

Table

input/output

combinations.

(A)

Logic

diagram

for

Sweep

Lockout

stage;

(B)

Table

input/output

combinations.

(A)

Logic

diagram

for

Alternate

Pulse

Generator

stage;

(B)

Table

input/output

combinations.

Input

and

output

pins

for

Z-Axis

Logic

IC.

(A)

Logic

diagram

for

Z-Axis

Logic

stage;

(B)

Table

input/output

combinations.

(A)

Logic

diagram

for

Horizontal

Binary

stage;

(B)

Table

input/output

combinations.

Input

and

output

pins

for

Vertical

Binary

IC.

(A)

Logic

diagram

for

Vertical

Binary

stage;

(B)

Table

input/output

combinations.

Input

and

output

pins

for

Plug-In

Binary

IC.

(A)

Logic

diagram

for

Plug-In

Binary

stage;

(B)

Table

input/output

combinations.

(A)

Diagram

Clock

Generator

stage;

(B)

Ide-

alized

waveforms

for

Clock

Generator

stage.

(A)

Logic

diagram

for

Vertical

Chopped

Blanking

stage;

(B)

Table

input/output

combinations.

Idealized

waveforms

for

Vertical

Chopped

Blank-

ing

stage.

(A)

Logic

diagram

for

Chop

Counter

stage;

(B)

Table

input/output

combinations.

Logic

diagram

Vertical

Mode

Logic

stage.

Simplified

schematic

trigger

selection

circuitry.

Input

levels

U2404

and

U2424

(source

triggering

signal

shown

parentheses).

Page

1-1

2-12

2-13

2-14

2-16

2-17

2-18

2-19

2-20

2-23

2-24

2-25

2-26

2-27

Number

2-22

2-23

2-24

2-25

2-27

2-28

2-29

2-30

2-31

2-32

2-33

2-34

2-36

2-37

2-38

2-39

2-40

2-41

2-42

2-43

Input/output

table

for

and

Trigger

Selector

stages.

Detailed

block

diagram

Vertical

circuit.

Interface

Input/output

table

for

Vertical

Plug-In

Selector.

Input/output

table

for

Vertical

Trace

Separation

stage.

Horizontal

Interface

circuit

detailed

block

diagram.

Input/output

table

for

Horizontal

Plug-In

Selector.

Output

Signals

detailed

block

diagram.

Detailed

block

diagram

circuit.

Inverter/Rectifiers

Simplified

schematic

Inverter,

Regulator,

and

Inverter

Control

stages.

Detailed

block

diagram

Low-Voltage

Regulators

circuit.

Location

readout

words

the

CRT

identifying

the

originating

plug-in

and

channel

(one

complete

frame

shown,

simulated

readout).

Character

Selection

Matrix

for

7704A

Readout

System.

Typical

readout

display

where

only

channel

the

Right

Vertical

and

Horizontal!

units

displayed.

Detailed

block

diagram

Readout

System.

Output

waveforms

Timer

stage.

Detail

output

pins

12, 13, 14,

and

U3433.

Timer

stage

operation

when

Display-Skip

condition

occurs,

Time

relationship

the

time-slot

(TS)

pulses

produced

U3445.

Typical

encoding

scheme

for

voltage-sensing

plug-

unit.

Coding

shown

for

deflection

factor

100

microvolts.

Ideafized

current

waveforms

of:

(A)

Row

analog

data,

(B)

Column

analog

data.

Block

U3401.

representation

memory

sequence

Typical

output

waveforms

for

Zeros

Logic

and

Memory

stage

operation

(at

U3401).

Page

2-27

2-28

2-29

2-30

2-31

2-32

2-34

2-35

2-38

2-40

2-41

2-42

2-43

2-45

2-46

2-47

2-49

2-50

2-52

2-54

ata

7704A

Service

Number

2-44

2-45

2-46

2-47

2-48

3-1

3-2

3-6

3-7

3-3

4-1

4-2

4-3

LIST

ILLUSTRATIONS

(cont)

Readout

word

relating

possible

character

loca-

tions

the

decimal

point

instructions

that

can

encoded,

and

the

resultant

CRT

display.

Flow

chart

for

character

generation

the

Read-

out

System,

Vertical

Amplifier

circuit

detailed

block

diagram.

Horizontal

diagram.

Amplifier

circuit

detailed

block

Detailed

block

diagram

CRT

Circuit.

Power-unit

securing

screws.

Troubleshooting

chart

for

7704A.

Location

P4417

and

P4418

A44,

Vertical

Amplifier

board.

Location

adjustments

A22,

Vertical

Interface

board.

Location

P4315

and

P4316

A43,

Horizontal

Output

board.

Location

adjustments

A23,

Horizontal

Inter-

face

board.

Disassembly

and

assembly

Display

and

Acquisi-

tion

units.

Exploded-view

drawing

portion

the

power

unit

identifying

several

critical

parts.

Waveform

showing

correct

high-frequency

com-

pensation

horizontal

amplifier.

Circle

surrounds

compensated

portion

waveform.

Typical

display

when

checking

X-Y

phase

shift.

Readout

display

with

03416

removed.

Electrode

configuration

for

semiconductors

used

the

7704A.

Location

circuit

boards

the

7704A.

A10—Calibrator

circuit

board.

Electrode

configuration

for

semiconductors

shown

diagram

Calibrator

and

Front

Panel

A20—Main

Interface

circuit

board.

Main

Interface

A25—Logic

circuit

board.

Page

2-55

2-56

2-57

2-58

2-60

3-1

3-6

3-9

3-10

3-11

3-12

3-15

4-18

4-23

6-1

6-2

6-3

6-4

6-6

Number

6-7

6-14

6-15

6-16

6-17

Electrode

configuration

for

semiconductors shown

diagram

Logie

Circuit

A24—Trigger

Selector

circuit

board.

Trigger

Selector

A22—Vertical

Interface

circuit

board

(front

view).

A22—Vertica!l

Interface

circuit

board

(rear

view).

Vertical

Interface

A23—Horizontal

Interface

circuit

board.

Horizontal

Interface

A33-—Signal

Out

circuit

board.

Output

Signals

A30—Power

Supply

Inverter

circuit

board.

A31—Rectifier

and

Filter

circuit

board.

Electrode

configuration

for

semiconductors

shown

diagram

Inverter/Rectifiers

A32—Regulator

circuit

board.

Electrode

configuration

for

semiconductors

shown

diagram

Low-Voltage

Regulators.

A34—Readout

circuit

board.

Electrode

configuration

for

semiconductors

shown

diagram

10.

Readout

System

Main

Interconnect

A44—Vertical

Amplifier

circuit

board.

Vertical

Amplifier

A43—Horizontal

Output

circuit

board.

Efectrode

configuration

for

semiconductors

shown

diagram

13.

Horizontal

Amplifier

A41—Z-Axis

circuit

board.

A42-HV

circuit

board.

Page

6-9

6-10

6-21

6-23

6-24

6-27

6-28

Number

6-25

6-26

6-27

6-28

6-29

6-30

6-31

6-32

6-33

Nese!

7704A

Service

LIST

ILLUSTRATIONS

(cont)

Electrode

configuration

for

semiconductors

shown

diagram

14,

CRT

Circuit.

+54-Volt

test

point

focation

A32—Regulator

board

(top

power

unit).

+54-Volt

adjustment,

R3143,

location

power

unit.

Power-supply

test

points

and

—50-Volt

adjustment

locations

A32—Regulator

board.

+150-Volt

test

point location

A43—Horizontal

Output

board.

4222,

high-voltage

test

point

location.

Location

Z-Axis

and

Display

calibration

adjust-

ments

and

test

points

A41—Z-Axis

board.

Location

Vertical

System

calibration

adjust-

ments

A44—Vertical

Amplifier

board.

Location

high-frequency

compensation

adjust-

ments

A22—Vertical

Interface

board.

Location

Horizontal

System

calibration

adjust-

ments

A43—Horizontal

Output

board.

Page

6-29

6-31

6-33

6-35

Number

Page

6-35

Location

Calibrator

adjustments

A10—Cali-

6-35

brator

board.

6-36

Location

signal

selector

switches

A33—Out-

6-35

put

Signals

board.

6-37

Location

Readout

System

calibration

adjust-

6-35

ments

A34—Readout

board.

MECHANICAL

PARTS

LIST

ILLUSTRATIONS

Number

D7704

A7704

Front

A7704

Rear

Cabinet

Accessories

Instrument

Options

Repackaging

LIST

TABLES

Number

Page

2-1

Basic

Logic

Reference

2-3

2-2

Standard

Readout

Format

2-42

2-3

Channel

Address

Code

2-48

3-1

Power

Supply

Tolerance

and

Ripple

3-4

3-2

Fuse

Ratings

3-19

4-1

Test

Equipment

4-2

Power

Supply

Tolerance

4-6

4-3

High-Frequency

Compensation

4-11

Bee

JIORIZ

aDRAWING

TIME

#ASEF

Prigny

“TAR

OSCILLOSCOPE

SYSTEM

3855

ccmrasinmemn

HORE.

7704A

Oscilloscope

System.

‘

INTRODUCTION

The

TEKTRONIX

7704A

Oscilloscope

System

solid-state,

high

performance

instrument

designed

for

gen-

eral

applications.

(For

rise

time

and

bandwidth

specifica-

tions

oscilloscope

systems

using

the

7704A,

see

the

Operators

manual).

The

system

composed

two

individ-

ual

units,

the

A7704

Acquisition

Unit

and

the

D7704

Display

Unit.

The

A7704

Acquisition

Unit

has

four

plug-in

compart-

ments.

The

left

pair

plug-in

units

connected

the

vertical

system;

the

right

pair

connected

the

horizontal

system.

Electronic

switching

between

the

plug-ins

con-

nected

each

system

allows

dual-trace

vertical

display

dual-sweep

horizontal

display.

7704A

Service

The

D7704

Display

Unit

features

CRT

with

small

spot

size

and

high

writing

rate.

addition

the

waveform,

the

CRT

can

also

display

alpha-numeric

information

from

the

plug-in

units,

such

deflection

factor,

sweep

rate

and

other

encoded

parameters.

Standard

graticule

size

centimeters.

supplies

the

Acquisition

Unit

supply

power

for

the

entire

instrument.

These

supplies

are

regulated

assure

that

performance

not

affected

variations

line

voltage

and

frequency,

changes

load

due

the

varying

power

requirements

the

plug-in

units.

sesso!

Section

1—7704A

Service

OPERATING

INFORMATION

PRELIMINARY

INFORMATION

Operating

Voltage

The

7704A

can

operated

from

either

115-volt

ora

230-volt

nominal

fine

voltage

source.

The

Line

Selector

assembly

the

rear

panel

converts

this

instrument

from

one

operating

voltage

the

other.

This

assembly

also

includes

line

fuses.

Use

the

following

procedure

obtain

correct

instrument

operation

from

the

line

voltage

available.

CAUTION

This

instrument

designed

for

operation

from

power

source

with

its

neutral

near

earth

(ground)

potential

with

separate

safety-earth

conductor.

not

intended

for

operation

from

two

phases

multi-phase

system,

across

the

legs

single-phase,

three-wire

system.

Disconnect

the

instrument

from

the

power

source.

Loosen

the

two

captive

screws

which

hold

the

cover

onto

the

selector

assembly;

then

pull

remove

the

cover.

convert

from

115-volt

230-voit

nominal!

line

voltage,

vice

versa,

pull

out

the

Selector

switch

bar

(see

Fig.

1-1)

and

plug

back

into

the

remaining

hole.

Change

the

line-cord

power

plug

match

the

power-source

receptacle,

use

115-

230-volt

adapter.

Power

Cord

Conductor

Identification

Indicator

Tab

Captive

Screws

Selector

Switch

bar

Conductor

Color

Alternate

Color

Ungrounded

(Line)

Brown

Black

Grounded

(Neutral)

Blue

White

Grounding

(Earthing)

|Green-Yellow

Green-Yellow

Install

the

cover

and tighten

the

captive

screws.

REV.C,

NOV.

1976

Fig.

1-1.

Line

Selector

assembly

rear

pane!

(shown

with

cover

and

fuses

removed).

Before

applying

power

the

instrument,

check

that

the

indicator

tab

the

switch

bar

protruding

through

the

correct

hole

for

the

desired

line

voltage

range.

The

7704A

designed

used

with

three-wire

power

system.

the

three-

two-wire

adapter

used

connect

this

instrument

two-wire

power

system,

sure

connect

the

ground

lead

the

adapter

earth

(ground).

Failure

complete

the

ground

system

may

allow

the

chassis

this

instrument

to be

elevated

above

ground

potential

and

pose

shock

hazard.

CONTROLS

AND

CONNECTORS

The

major

controls

and

connectors

are

located

the

front

panel

the

instrument.

Several

auxiliary

functions

are

provided

the

rear

panel.

Figure

1-2

shows

the

front

and

rear

panels

and

provides

brief

descriptions

each

control

and

connector.

For

detailed

operating

infor-

mation,

refer

the

7704A

Operators

Manual.

1-1

Operating

Information—7704A

Service

ASTIG

Screwdriver

adjust-

ment

obtain

well-defined

display.

Does

not

require

re-

FOCUS

Adjustment

for

opti-

adjustment

normal

use.

mum

display

sharpness.

BEAM

FINDER

Compresses

and

defocuses

display

within

graticule

area

regardless

dis-

play

position

applied

signal.

INTENSITY

Controls

bright-

ness

the

display

(except

the

readout

portion).

‘

JI04A

TRACE

ROTATION

Screw-

OSEIRLASCOPE.SYSTEM

driver

adjustment

align

READOUT

Controls

bright-

trace

with

graticule.

;

ness

the

readout

portion

the

CRT

display.

Turns

off

the

readout

system

when

the

CCW

detent

position,

GRAT

!LLUM

Controls

grati-

cule

illumination.

CALIBRATOR

Provides

cali-

brated

40mV-4V,

1kHz

square-wave

signals.

TRIGGER

SOURCE

Selects

internal

trigger

source

for

HORIZ

time

base.

POWER

(PULL)

INTEN

Controls

brightness

the

trace

produced

the

HORIZ

plug-in.

vertical

gin

compart

‘AT704

AOBOSTION

UNIT

ment(s)

providing

the

vertical

deflection

signal.

HORIZONTAL

MODE

Selects

horizontal

plug-in

compart-

VERT

TRACE

SEPARATION

INTEN

Controls

brightness

eflecion

agra

(B}

Vertically

positions

the

trace

produced

the

HORIZ

trace

with

respect

HORIZ

plug-in.

the A

HORIZ

trace

(dual-

sweep

modes

only)

TRIGGER

SOURCE

Selects

internal

trigger

source

for

HORIZ

time

base.

Fig.

1-2A.

7704A

front-panel

controls

and

connectors.

1-2

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