Centronics 704 Manuale utente

AUG

1979

Centronics

No.

37400700

Rev-1

Rad

Seb

Mee

SOT

tte

eee

TECHINIGAL

MANUAL

Pens

ecient

nee

etn

eee

vat

CENTRONICS’

data

computer

corporation

Hudson,

New

Hampshire

03051

Telephone

(603)

883-0111

THE

INFORMATION

CONTAINED

HEREIN

PROPRIETARY

AND

!IS

NOT

RELEASED

REPRODUCED

WITHOUT

WRITTEN

PER-

MISSION

CENTRONICS

data

computer

corp.

CENTRONICS

Centronics

Data

Computer

Corp.

Hudson,

N.H.

03051

Tel.

(603)

883-0111,

TWX.

(710)

228-6505,

TLX.

94-3404

Eastern

Region

(Mass.):

Tel.

(617)

935-6150

Central

Region

(Texas):

Tel.

(817)

461-5711,

TWX.

910-890-4916

Western

Region

(Calif.):

Tel.

(714)

979-6650,

TWX.

910-595-1925

Centronics

Data

Computer

(Canada)

Ltd.

Mississauga,

Ontario

Tel.

(416)

625-0770,

TWX.

610-492-4382

Centronics

Data

Computer

(U.K.)

Ltd.

London,

England

Tel.

581-1011,

TLX.

8951373

Centronics

Data

Computer

(France)

Rue

Dombasie,

75015

Paris,

France

Tel.

828-4051,

TLX.

202686

Centronics

Data

Computer

(Germany),

Gmbh

6000

Frankfurt

Main

Tel.

666-1021,

TLX.

841-413224

Centronics

Puerto

Rico

Dorado,

Puerto

Rico

Tel.

(809)

796-1881,

TLX.

385-9349

197§$

Centronics

Data

Computer

Corp.

All

rights

reserved

Patents

pending

U.S.A.

and

other

countries

Printed

U.S.A.

Specifications

subject

change

without

notice.

the

U.S.A.,

for

fast

service

call

toll

free

1-800-258-1952

TECHNICAL

MANUAL

MODEL

704

PRINTER

CENTRONICS’

data

computer

corporation

Hudson,

New

Hampshire

03051

Telephone

(603)

883-0111

TABLE

CONTENTS

SECTION

INTRODUCTION

Section

1.1

MANUALS.

«©

«© «© «©

«© «@

1.2

GENERAL

DESCRIPTION.

1.3

PHYSICAL

DESCRIPTION

o«

-«

1.321

Mechanism

12-342

Electronics.

«2.

123.3

Paper

Handling

Mechanism

1.4

PRINTER

OPERATION

- - +

«©

1-4-1

Character

Printing

124.2

Paper

Motion

1-4.3

Special

Functions.

1.5

SPECIFICATIONS

SUMMARY.

. . .

SECTION

INSTALLATION/SET-UP

2e1

INTRODUCTION

~©

«©

e©

202

FLOOR

PLANNING

-«©

«© «© oc

203

SET-UP

PROCEDURES

e e

SECTION

THEORY

OPERATION

3e1

OVERALL OPERATION

ce o«

-«

301.1

Input/Output

Signals

301.2

Microprocessor

control

321.3

Memory

Organization.

3.2

MICROPROCESSOR

(MPU)

«©

« «

3e2e1

Architecture

e e °

3e2Qe2

Timing

e e

36223

Basic

MPU

Operation

. . «

30204

Microprocessor

Program

Control

-j-

4=3

1-3

1-4

1-7

3-4

3-6

3-9

TABLE

CONTENTS

(cont'd)

Section

3.3

3.7

3.8

3.9

3.10

BUS

STRUCTURE»~

«©

«+

3.1

General

Description

Detailed

Description

033

Input

Data

Transfers.

3.4

I/O

Bus

Transfers.

SYSTEM

TIMING

SERIAL

COMMUNICATIONS

« «

e«

3-5-1

Input

Data

° ° ®

3.5.2

Output

Datae

CONTROL

CHARACTERS

»«

«.«

Firmware

Response

3.6.1

36-2

Control

Codese

.«

MRI

AND

DEVICE

SELECT

DECODING

367.1

Device

Select

3e7e2

MRI

Decoding

e e

CONTROL

PANEL/MPU

COMMUNICATIONS

VFU

Reader/MPU

COMMUNICATIONS

PRINTER

MECHANISM

OPERATION

3-10.1

Carriage

Motor

Operation

3210-2

VIDINT

Generation

3e-10.3

Character

Generation.

MISCELLANEOUS

OPERATIONS

3-11.-1

Audio

Alarm

3e11-2

Paper

Out

e e e

3211-3

Motor

Control

STEPPER

MOTOR

OPERATION

POWER

DISTRIBUTION

-«©

«©

3-18

3-19

3-20

3-23

3-24

3-26

3-27

3-29

3-30

3-31

3-35

3-36

3<38

3-41

ATO

MN:

ree

TABLE

CONTENTS

(cont'd)

-1ii-

Section

SECTION

MAINTENANCE

4.1

INTRODUCTION

.«

«©

ee e«

4.2

PRINTER

MARKING

AND

CONFIGURATION

4.2.1

Centronics

Nameplate

4.262

Fuse

Marking

and

Location

4.2.3

logic

Board

Marking

and

Configuration

4.2.4

Dip

Switch

Settings,

Control

Panel

4.3

RECOMMENDED

PREVENTIVE

MAINTENANCE.

4.4

TROUBLESHOOTING

GUIDE

.«.

e«

4.5

RECOMMENDED

TOOLS

.©

+26

e«

oe.

SECTION

ADJUSTMENTS

INTRODUCTION

e e e

‘eo

5.2

CHARACTER

PRINTING

ADJUSTMENTS

5.2.1

Penetration

Adjustment,

Head

522-2

Timing

Fence

Adjustment.

522-3

Carriage

Actuator

Arms

Adjustment

5.2.4

Main

Drive

Belt

Adjustment.

5.3

PAPER

MOTION

ADJUSTMENTS

-«

e«

-«

5.3.1

Paper

Feed

Timing

Belt

Adjustment

523-2

Platen

Adjustment.

. .

5-323

Tractor

Drive

Timing

Belt

Tension

5.3.4

Paper

Tension

Adjustment.

5.4

ELECTRICAL

ADJUSTMENTS

2°

e«

5.4.1

Video

Amplifier

Adjustments

5.4.2

Logic

Board

Adjustments.

SECTION

REMOVAL/

REPLACEMENT

6.1

INTRODUCTION

«©

5»

«©

e«

COVER

ASSEMBLIES

e e

6.3

HEAD

ASSEMBLY.

6.4

POWER

DRIVER

BOARD

ASSEMBLY

6.5

TIMING

FENCE

ASSEMBLY

o«

6.6

VIDEO

AMPLIFIER

ASSEMBLY

. . .

4-1

4-2

4-9

4~11

4-13

5=1

5-2

5=3

5-4

5=5

5-6

5-9

6-4

6-5

6-6

TABLE

CONTENTS

(cont'd)

Section

6.7

RIBBON

CARTRIDGE

ASSEMBLY

6.8

LIGHTWEIGHT

CARRIAGE

ASSEMBLY

. .

6.9

STEPPER

MOTOR

ASSEMBLY,

CARRIAGE

DRIVE

6.10

STEPPER

MOTOR

ASSEMBLY,

PAPER

DRIVE

6.11

PLATEN

ASSEMBLY

6.12

VERTICAL

FORMAT

UNIT

~© -© «©

-»

6.13

TRACTOR

DRIVE

ASSEMBLY

°° es

6.14

FEED

TRACTORS,

LEFT/RIGHT

. .

6.15

PRIMARY

VOLTAGE

ASSEMBLY

. .

e«

6.16

CAPACITOR/DIODE

BRIDGE

ASSEMBLY

6.17

FAN

ASSEMBLY

* e

«©

e©

6.18

LOGIC

BOARD

ASSEMBLY

.«

-«

6.19

CONTROL

PANEL

ASSEMBLY

©e©

SECTION

ELECTRICAL

DRAWINGS

APPENDIX

SIGNAL

GLOSSARY

6-10

6-11

6-12

6-13

6-14

6-16

6-17

6-18

6-19

6-20

2-2

3=1

3-3

3=4

3-5

3-6

3-7

3=8

3-9

3-10

3-11

3-12

3-13

3-14

3-15

3-16

3-17

3-18

3-19

3-20

3-21

3-22

3-23

3-24

3-25

3-26

3-27

4-1

4=2

4=3

5-1

5=2

5=3

LIST

ILLUSTRATIONS

Model

704

Printer.

.« «© e« «6

«o

« «

Major

Assemblies

.«

«.«

«ce

e«

e« -e

Printer

Basic

Block

Diagram

. .

.«

Printer

Pictorial

Diagram.

. .

« «

Character

Printing/Paper

Motion

. . .

.e«

Printer

Outline

Drawing.

.«

.« .«

e«

Set-Up

Proc

edur

° ®

Overall

Block

Diagram

. .

«o«

Memory

Map

+« +«

e« «©

-«

8080A

Microprocessor

Designations

MPU

Block

Diagram.

.«

+« «+

««

Typical

Output

Instruction

Cycle

Timing

. .

MPU

Status

Word

«©

«© «©

Bus

Structure

Block

Diagram

. .

.« .«

« e

$1/82

MPU

Timing

Circuit

e ©

e «

G$2BY2/P2BY8

Timing

Circuit

°°

Data

Bus

Assignments

(Baud

Rate

Commands).

Control

Panel

Status

Word

. .

-«

.«

« «

Exploded

Section

Timing

Fence.

e«

.«

Video

Amplifier

Simplified

Schematic

Video

Edge

Detector

Circuit/Timing

. . .

Miscellaneous

Operations

e«

«.«

«+«

e« -.

Basic

Stepping

Motor

Operation

.-«

«+ «+

Stepper

Motor

Drive

Circuit

ele

lls

Power

Distribution

Diagram.

.«

«©

«+

e e

FLOW

CHARTS

Printer

Initialization

.~.

.«

c«

-«

.«

Main

Program

Monitoring

loop

-«

e«

Routine

«.«

«-

e«

«e«

-«

Video

Interrupt

Routine.

.«

e«

« e

Carriage

Drive

Interrupt

Routine.

.«

Paper

Drive

Interrupt

Routine.

.«

e«

Control

Character

Interrupt

Routine.

VFU

Paper

Tape

Load

Routine

. .

.«

e e

Control

Character

Interrupt

Routine.

Centronics

Nameplate.

. .

+« e«

.«

e«

logic

Board

Marking

«©

-«

+« e«

Dip

Switch

Setting

(Control

Panel)

-«

Recommended

Tools

«© e@

Penetration

Adjustment

(Print

Head

Assembly).

Timing

Fence

Adjusttment

-«

+«

-e

Carriage

Actuator

Arms

Adjustment

« -

2~1

2-3

3-0

3-2

3-4

3-5

3-7

3-8

3-10

3=17

3-18

3-19

3-27

3-30

3-31

3-32

3-36

3-38

3-39

3-41

3-42

3-43

3-44

3-45

3-46

3-47

3-48

3-49

4-1

4-2

4-3

4-13

5=2

5=3

Ongena

San

amg

Figure

5-4

5=5

5-6

5-7

5-8

5-9

5-10

5-11

6-1

6-2

6-3

6-4

6=5

6-6

6-7

6-8

6-9

6-10

6-11

6-12

6-13

6-14

6-15

6-16

6-17

7=1

7-2

7=3

7-4

7=5

7-6

7=7

7-9

7-10

LIST

ILLUSTRATIONS

Main

Drive

Belt

Adjustment.

. .

Paper

Feed

Timing

Belt

Adjustment

Platen

Adjustment

©.

-»

Tractor

Drive

Timing

Belt

Tension

Paper

Tension

Adjustment

. .

Optical

Pickup/Timing

Fence

Alignment

Optical

Pickup,

Vertical

Alignment

Duty

Cycle

and

Phase

Adjustment

Video

REMOVAL/

REPLACEMENT

Cover

Assemblies

.«

e«

Head

Assembly

~ .

.« e«

Power

Driver

Board

Assembly

Timing

Fence

Assembly

.«

Video

Amplifier

Assembly

Ribbon

Cartridge

Assembly

. . .

Carriage

Assembly

°°

e©

«©

Stepper

Motor

Assembly,

Carriage

Drive.

Stepper

Motor

Assembly,

Paper

Drive.

Platen

Assembly

.-«

.«

o «

Vertical

Format

Unite

. .

e«

Tractor

Drive

Assembly

Feed

Tractors,

Primary

Voltage

Assembly

Capacitor/Diode

Bridge

Assy

Fan

Assembly

.« -«

e«

Logic

Board

Assembly.

. .

Control

Panel

Assembly

. . .

FUNCTIONAL

SCHEMATICS

Data/IO/Address

BuS

«©

.«

«=

.«

Input

Data

.«

«©

«@

Device

Select

.«

.o«

Control

Panel/MPU.

° °

e °

VFU

Reader/MPU.

e e

e .

e e

CG/STM/CRM/MPU.

.«

e«

«©

e«

SCHEMATIC

DIAGRAMS

Logic

Board

6 © © ©

Power

Driver

Board

.«

Video

Amplifier

Board

Control

Panel

Board

»«

5-4

5=5

5-5

5-6

5-7

5-9

6-0

6=3

6-4

6-5

6-6

6-7

6~9

6-10

6-11

6-12

6-13

6-15

6-16

6-17

6-18

6-19

6-20

7=3/7=4

7-5/7-6

7=7/7-8

7-9/7=10

7=11/7=12

7~13/7-14

7-18

7=19

7-22

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