Tektronix 4023 User manual

4023

COMPUTER DISPLAY

TERMINAL

SERVICE MANUAL

Tektronix,

Inc.

P.O.

Box

500

Beaverton,

Oregon

97077

MANUAL PART

NO.

070-1617-00

PRODUCT GROUP

COMMITTED

EXCELLENCE

Please

Check

for

CHANGE INFORMATION

the Rear

this

Manual

4023

COMPUTER DISPLAY

TERMINAL

SERVICE MANUAL

First Printing JAN

1974

Revised MAY 1981

1974

by Tektronix, Inc., Beaverton, Oregon.

Printed

Contents of this publication may not be reproduced

any

form without permission of Tektronix, Inc.

This instrument,

whole or in part, may be protected by one

or more

U.S.

or foreign patents

patent applications.

Information provided

request by Tektronix, Inc.,

P.O.

Box

500, Beaverton, Oregon 97077.

TEKTRONIX is a registered trademark of Tektronix, Inc.

4023

Service

TABLE OF

CONTENTS

SECTION 1 INSTALLATION AND OPERATION Page

Introduction

1-1

Installation

1-1

General

1-1

Mounting

the

Terminal

1-1

Circuitry Access

1-1

Selecting

Strappable

Options

1-1

AC Power Sources and Requirements 1-2

Voltage,

Current,

and Power Requirements 1-2

AC Power Cord and Grounding Requirements 1-6

Power Cord Color Coding 1-6

Spare Switch Connections 1-8

Spare Indicator Connection 1-8

Rear Panel Connectors 1-8

Control Descriptions 1-8

General 1-8

Display

and

Power Controls 1-8

Rear Panel Control 1-9

Console Controls and Indicators 1-9

The Keyboard 1-11

Function

Pad Controls 1-11

Operating Modes 1-13

General 1-13

Direct

Entry

1-13

Buffer

Entry

1-13

Enter Key

Entry

1-13

Send Key

Entry

1-14

Use

Message Separators 1-14

Buffer

Form

Fill-Out

Entry

1-14

Transmitting Form Fill-Out Data Via Enter 1-15

Transmitting Form Fill-Out Data Via Send 1-16

Nul Suppression 1-16

SECTION 2 CHARACTERISTICS

Introduction

2-1

Alphabetic Listing 2-2

Tables 2-7

Accessories 2-7

Code

Effect

2-7

Data Coding 2-11

Data Transfer 2-11

Display Specifications 2-12

Editing Specifications 2-13

Environmental Specifications 2-13

Field

Attribute

Codes 2-14

Physical Specifications 2-14

Power

Supply

Specifications 2-15

Reset Key

Functions

2-15

Strap

Options

2-16

Timing Specifications 2-23

SECTION 3 MAINTENANCE

General

Information

3-1

Introduction

3-1

Desk Mounting 3-1

Mounting

the

Terminal

the

Optional Pedestal

3-1

Servicing Procedure

3-1

Soldered

Options

3-1

Troubleshooting

Information 3-2

Troubleshooting

Procedure 3-2

Recommended

Troubleshooting

Equipment

3-2

Disassembly and Assembly 3-3

Access

the

Display Unit Circuitry 3-3

Keyboard

Information

3-3

REV.

B, DEC.

1974

Circuit Card

Information

3-3

4023

Service TABLE OF

CONTENTS

(cont)

SECTION 3

MAINTENANCE

(Cont)

Page

Rear Assembly Removal 3-3

Monitor

Assembly

Information

3-4

Monitor

Assembly Removal 3-4

CRT

Removal 3-5

Monitor

(CRT) Installation 3-5

Deflection

Amplifier

and High Voltage Board 3-5

High Voltage Transformer Removal 3-5

Silicon Grease 3-5

Power Transformer

Information

3-5

SECTION 4

PERFORMANCE

CHECK/ADJUSTMENT

PERFORMANCE

CHECK

4-1

General

4-1

Performance Check Procedure

4-1

ADJUSTMENT

4-9

Introduction

4-9

Equipment

Required 4-9

Adjustment

Procedure 4-9

Preliminary 4-9

Remove the Terminal Cover 4-9

Detailed Procedure 4-9

SECTION 5

ELECTRICAL

PARTS

LIST

5-1

SECTION 6

THEORY

OPERATION

INTRODUCTION

6-1

GENERAL

DESCRIPTIONS

6-1

Keyboard

6-1

Timing

Card

6-1

Keyboard Interface Card 6-2

Control

Card 6-2

Cursor Card 6-3

RAM

Card 6-3

Edit

Card 6-3

Low

Voltage Power

Supply

6-3

Display

Circuits

6-4

DETAILED

DESCRIPTION 6-4

Keyboard Description 6-4

General 6-4

Coded Character Generation 6-4

Function

Pad

Operation 6-4

Miscellaneous Functions 6-5

Timing

Card 6-5

Timing

6-5

Character Generation 6-7

Retrace Times 6-8

Circuit

Functions 6-9

Miscellaneous 6-11

Keyboard Interface Card 6-11

nputting

Keyboard Data 6-11

Control

Character Decoders 6-12

Keygate Generator

With

Repeat 6-12

TSTROBE and CSTROBE

Control

6-12

Move Cursor

Timing

6-12

Move Cursor Gates 6-13

Carriage Return and

Line

Feed

Circuits

6-13

Clear

Page

and

Erase

Input

Circuits 6-13

Page

Full

Circuit

6-14

Wrap-Around

Circuit

6-14

Miscellaneous

Circuits

and Operations 6-14

ii ®

TABLE OF

CONTENTS

(cont)

SECTION 6 THEORY

OPERATION (Cont)

Control Card

General Circuitry Information

Miscellaneous Circuits and Operation

Explanation

Transmission Control

Cursor Card

General

Cursor Register Operation

Display Register Operation

Edit Effects on the Registers

Cursor Addressing and Reading

Miscellaneous Circuits

Summary

Random Access Memory (RAM) Card

Introduction

Operation

Major Circuits

Sense Amps

Miscellaneous Circuits

Edit Card

Introduction

Edit Circuits

RolI·Up Circuitry

Read Cursor Position

Cursor Positioning

Character Decoding Circuit

Bit 8 and Bit 9

Set

Tab/Backtab Circuits

Display Circuits

General

Vertical

Horizontal

Video

Brightness

Focus

Power Supply

+15·Volt Supply

-12

and

-5·Volt

Supplies

+5·Volt Supply

WIRING AND SIGNAL INFORMATION

Wiring

How

Use the Wiring Information

Wire Lists

Minibus Signal Listing and Descriptions

DIAGRAMS

SECTION 7 MECHANICAL PARTS LIST

CHANGE INFORMATION

Page

6·14

6·15

6·16

6·20

6·21

6·23

6·24

6·26

6·27

6·28

6·29

6·30

6·31

6·32

6·33

6·34

6·35

6·44

7·1

4023

Service

iii

4023

Service Fig. 1·

1.4023

Computer

DisPlay

Terminal

Section

1-4023

Service

INSTALLATION

AND

OPERATION

This manual

part

the

following

set

documents

which describe

the

4023

Refreshed

Computer

Display

Terminal:

4023

USERS

MANUAL,

Tektronix

Part No.

070-1621-00.

Contents-An

explanation

how

operate

and

pro-

gram

the

4023.

4023

SERVICE

MANUAL,

Tektronix

Part No.

070-1617-00.

Contents-A

comprehensive

explanation

the

4023.

includes

operation,

characteristics, servicing,

adjustment,

circuit

description,

and

parts lists.

Optional

items used

with

the

Terminal are

explained

separate

manuals.

INTRODUCTION

The

4023

Computer

Display Terminal interfaces be-

tween

man

and

computer

permitting

inputs

through

integral

keyboard

and

providing a display

computer

output

data.

addition,

the

Terminal can relay

data

bi-directionally

between

peripheral devices

and

computer.

An Interface

Unit

must

be installed in

the

Terminal

and

connected

the

computer-either

directly

through

modem

(modulator-demodulator)-to

permit

information

interchange.

The

Terminal has

the

ability

have copies

made

its display, via a Hard

Copy

Unit.

INSTALLATION

GENERAL

Installation consists

desk-mounting

the

Terminal,

selecting

the

proper

operating

voltage

and

fuse size,

setting

the

desired

strap

options,

and

connecting

the

Terminal

the

computer.

These steps are discussed in

the

following

paragraphs.

MOUNTING

THE

TERMINAL

Desk-Mounting consists

simply

setting

the

Terminal

a desk

other

surface.

The

air vents

the

bottom

and

sides

should

kept

free

obstructions

permit

air

flow

through

the

unit.

A dimensional drawing

provided in Fig. 1-2 as an

installation aid.

REV.

Dl:C.

1974

CIRCUITRY

ACCESS

The

display

unit

cover

must

removed

permit

access

the

Motherboard

into

which

the

Terminal

Control

cards,

interface cards,

and

optional

accessory

cards

are installed.

Removing

the

display

unit

cover

opens

a line voltage

safety

interlock

switch,

which

automatically

cuts

power

when

the

cover

removed.

The

switch

actuator

(located, in

the

top,

left-rear corner) can be pulled

permit

Terminal

operation

with

the

display

unit

cover removed.

WARNING

Dangerous voltages exist

the display unit

area

when

the line cord

connected. Servicing should be done

only

qualified technicians.

SELECTING STRAPPABLE OPTIONS

Strappable

options

are movable wire

straps

located

circuit

cards inside

the

display

unit,

Figs. 1-3

and

1-4

show

the

strap

option

locations. These

straps

provide

options

for

the

operator

and

programmer

and

can be

set

the

user site

qualified technical

personnel.

The

circuit

cards (seven

them)

plug

into

the

Motherboard.

See Fig. 1-5

for

card

locations

the

Motherboard.

not

remove or install circuit cards while the

Terminal power

on.

The cards

must

installed in the order shown in

Fig.

1-5; otherwise, heat

not

dissipated properly.

The

positions

the

straps

are

dependent

upon

com-

puter

and

program

requirements,

and

some

cases,

upon

user preference.

The

location

and

description

the

movable

strap

options

for

the

Keyboard

Interface,

Control,

Timing,

and

Basic Data

Communications

nterface

cards are

shown

Figs. 1-3 and 1-4.

Information

cut-strap

options

can be

found

Section

this

manual.

The

Optional

Data

Communications

Interface

(021-0112-00)

be installed in P8.

The

Standard

Data

Communications

Interface (021-0111-00)

installed

P9. Detailed strap-

pable

option

information

for

these

two

interfaces

can

found

their

respective manuals.

1-1

Installation and

Operation-4023

Service

•

Fig.

1·2.

Physical

Dimensions.

Power

Sources

and

Requirements

Thi

s Te

rminal

intended

to be

operated

from

sing

phase

earth

referenced

power

source

having

one

current

carrying

conductor

(neutral)

ground

(earth)

potential

Operation

from

power

sources

where

both

curre

nt-

carrying

conductors

are

live

with

respect

earth

(such

phase-to-plyase

on a

multiphase

system,

across

the

leg

117-234

ngl

phase

three-wire

system)

not

recommend

because

the line

conductor

has

overcurrent

(fuse)

protection

within

the

instrument.

1-2

This

Terminal

designed

tooperate

from

either

a 110

220

volt

nominal

line

voltage

source

that

'has a

frequency

440 Hz. In

addition

any

three

voltage

ranges

for

100 Vac

four

voltage

ranges

for

220 Vac may

be selected. Voltage,

current

and

power

requirements

are

listed

below

VOLTAGE,

CURRENT,

AND

POWER

REQUIREMENTS

VOLTAGE

FREQUENCY

LINE

FUSE

INPUT

POWER

RANGE

(slo

blow)

100,115,

48Hz

120

220 W Max

200,220,

440Hz 1.25A -,

230, 240

REV

. B, DEC.

1974

BUF-position

with

BUFFER

selection

perm

its a

keyboard

also

generate

a linefeed.

position

permits

either

keyboard

computer

gen·

erated

generate

simultaneous

linefeed.

OUT

position

inhibits

simulta-

neous

linefeeds

with

CR,

regardless

origin.

0--.

EOL LF

GEN

n-I~J

LOCAL

OUT

O-_J

LOCAL

enables

line

feeds

generated

in LOCAL

when

transmitting

from

the

Terminal

buffer

aux-

iliary device. Line

feeds

are

not

transmitted

the

com-

puter

line_

enables

linefeeds

generated

transmit

circuits

when

operating

in LOCAL

ON LINE

with

BUFFER

selected.

OUT

prevents

linefeeds

from

being

generated

end

line.

o:t

M N

~ ~

iii iii iii iii iii

ciqqciq

Keyboard

nterface

Card.

Control

Card.

MESSAGE END

The

Message

End

character

the

last

character

sent

in a

buffer

Read Cursor trans-

mission.

The

standard

END

character

strapped

CR.

Installation and

Operation-4023

Service

DOES

td:~:~

position

performs

a line-

feed

only

upon

receipt

linefeed

command.

LF/CR

position

causes

simultaneous

carriage

return

function

upon

receipt

linefeed

command.

causes

wrap-around

when

moving

cursor

past

80th

character

position.

OUT

dis-

ables

wrap-around

OUT

is used

when

4023

does

not

require

prompt

char-

acter

for

data

transmission

from

buffer

line

time.

is used

when

4023

receive a

prompt

character

for

data

transmission

from

buffer.

Fig. 1-3A & B.

Options

the

Keyboard

nterface

and

Control

cards

that

can

selected

strap

placement.

® 1-3

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