Epson LG1-1070, LG1-570 Service Manual

EPSON TERMINAL PRINTER

LG1-570/lo7cJ

L

4000566

REV.-B

.

NOTICE

“ All rights reserved. Reproduction of any part of this manual in any from

whatsoever without

SEIKO EPSON’s

express written permission is forbidden.
“ The contents of this manual are subject to change without notice.
‘ All efforts have been made to ensure the accuracy of the contents of this manual.

However, should any errors be detected, SEIKO EPSON would greatly appreciate
being informed of them.

‘

The above notwithstanding SEIKO EPSON can assume no responsibility for any

errors in this manual or the consequences thereof.

@

Copyright 1991 by

SEIKO EPSON CORPORATION

Nagano, Japan

-i-

REV.-A

PRECAUTIONS

Precautionary notations throughout the text are categorized relative to 1) personal injury, and 2) damage

to equipment:

DANGER

Signals a precaution which, if ignored, could result in serious or fatal personal
injury. Great caution should be exercised in performing procedures preceded by
a DANGER heading.

WARNING Signals a precaution which, if ignored, could result in damage to equipment.

The precautionary measures itemized below should always be observed when performing repair/main­tenance procedures.

DANGER

1.

2.

3.

1.

2.

3.

4.

5.

ALWAYS DISCONNECT THE PRODUCT FROM BOTH THE POWER SOURCE AND THE
HOST COMPUTER BEFORE PERFORMING ANY MAINTENANCE OR REPAIR
PROCEDURE.

NO WORK SHOULD

B&

PERFORMED ON THE UNIT BY PERSONS UNFAMILIAR WITH

BASIC SAFETY MEASURES AS DICTATED FOR ALL ELECTRONICS TECHNICIANS IN

THEIR LINE OF WORK.
WHEN PERFORMING TESTING AS DICTATED WITHIN THIS MANUAL, DO NOT

CONNECT THE UNIT TO A POWER SOURCE UNTIL INSTRUCTED TO DO SO. WHEN
THE POWER SUPPLY CABLE MUST BE CONNECTED, USE EXTREME CAUTION IN
WORKING ON POWER SUPPLY AND OTHER ELECTRONIC COMPONENTS.

WARNING

REPAIRS ON EPSON PRODUCT SHOULD BE PERFORMED ONLY BY AN EPSON
CERTIFIED REPAIR TECHNICIAN.

MAKE CERTAIN THAT THE SOURCE VOLTAGE IS THE SAME AS THE RATED
VOLTAGE, LISTED ON THE SERIAL NUMBER/RATING PLATE. IF THE EPSON PROD­UCT HAS A PRIMARY-AC RATING DIFFERENT FROM THE AVAILABLE POWER
SOURCE, DO NOT CONNECT IT TO THE POWER SOURCE.
ALWAYS VERIFY THAT THE EPSON PRODUCT HAS BEEN DISCONNECTED FROM THE
POWER SOURCE BEFORE

REMOVI”NG

OR REPLACING PRINTED CIRCUIT BOARDS
AND/OR INDIVIDUAL CHIPS.
IN ORDER TO PROTECT SENSITIVE

/.LP

CHIPS AND CIRCUITRY, USE STATIC
DISCHARGE EQUIPMENT, SUCH AS ANTI-STATIC WRIST STRAPS, WHEN ACCESS­ING INTERNAL COMPONENTS.
REPLACE MALFUNCTIONING COMPONENTS ONLY WITH THOSE COMPONENTS
RECOMMENDED BY THE MANUFACTURER; INTRODUCTION OF SECOND-SOURCE

ICS

OR OTHER NONAPPROVED COMPONENTS MAY DAMAGE THE PRODUCT AND

VOID ANY APPLICABLE EPSON WARRANTY.

- ii -

REV.-B

PREFACE

This manual describes functions, theory of electrical and mechanical
operations, maintenance, and repair of the

LQ-570/l

070.
The instructions and procedures included herein are intended for the
experienced repair technician, and attention should be given to the
precautions on the preceding page. The chapters are organized as follows:

Chapter 1 -

Chapter 2 -

Chapter 3 -

Chapter 4 -

Chapter 5 -

Chapter 6 -

Provides a general product overview, lists specifications,

and illustrates the main components of the

Describes the theory of printer operation.

printer.

Includes a step-by-step guide for product disassembly and
assembly.

Includes a step-by-step guide for adjustment.

Provides Epson-approved techniques for troubleshooting.

Describes preventive maintenance techniques and lists
lubricants and adhesives required to service the equipment.

● The contents of this manual are subject to change without notice.

-

iv -

REVISION SHEET

REVISON

DATE ISSUED

CHANGE DOCUMENT

A

June 20, 1991 1st issue

B

Sept. 6, 1991

Added information for the LQ-1 070:

l-i, l-ii, 1-1 - 1-8, 1-10, 1-11, 1-24, 1-26 - 1-28

2-i, 2-ii, 2-1 - 2-11, 2-13-

2-15, 2-17, 2-18
3-i, 3-ii, 3-5 - 3-20
4-i, 4-1 - 4-4, 4-6
5-i, 5-1

- 5-5, 5-9, 5-11 - 5-19

6-i, 6-1, 6-4

A-1, A-ii, A-1

- A-1 5, A-17

-

A-1

9, A-22, A-23

–v–

REV.-A

TABLE OF CONTENTS

CHAPTER 1.

GENERAL DESCRIPTION

CHAPTER 2.

OPERATION PRINCIPLES

CHAPTER 3.

DISASSEMBLY AND ASSEMBLY

CHAPTER 4.

ADJUSTMENTS

CHAPTER 5.

TROUBLESHOOTING

CHAPTER 6.

MAINTENANCE

APPENDIX

-

vi -

REV.-B

1.1

1.2

1.3

1.4

1.5

1.6

1.7

CHAPTER 1

GENERAL DESCRIPTION

FEATURES

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-1

SPECIFICATIONS

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-3

1.2.1 Hardware Specifications

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-3

1.2.2 Firmware Specifications

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-9

INTERFACE OVERVIEW

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-14

1.3.1 Parallel Interface

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-14

CONTROL PANEL

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-16

DIP SWITCHES AND JUMPER SETTING

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-18

1.5.1 DIP Switch Settings

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-18

1.5.2 Jumper Setting

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-19

OPERATING INSTRUCTIONS

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-20

1.6.1

1.6.2

1.6.3

1.6.4

1.6.5

1.6.6

1.6.7

1.6.8

1.6.9

1.6.10

1.6.11

Self-Test

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-20

Hexadecimal Dump Function

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-20

Paper-out Detection and Forms Override Function . . . . . . . 1-21

Error Conditions

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-21

Buzzer Operation

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-21

Printer Initialization

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-21

Default Values

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-22

Sheet Loading and Sheet Ejection

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-22

Tear-off Function

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-23

LEVER, G, ADJUST

. . . . . . . . . . . . . . . .

. .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-24

printer Protection for Heavy-Duty Printing . . . . . . . . . . . . . . . . . . . . . 1-25

MAIN COMPONENTS

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-26

1.7.1

C062

MAIN Board (Main Control Circuit Board) . . . . . . . . . . . 1-26

1.7.2

C062

PNL Board (Control Panel Circuit Board) ............. 1-27

1.7.3

C062 PSB/PSE

Board (Power SupPlY Circuit Board) . . . 1-27

1.7.4 Printer Mechanism (M-5

E10/M-5E60)

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-28

1.7.5 Housing

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-28

1

-i

REV.-B

LIST OF FIGURES

Figure 1-1.

Figure 1-2.
Figure 1-3.
Figure 1-4.
Figure 1-5.
Figure 1-6.
Figure 1-7.
Figure 1-8.
Figure 1-9.
Figure l-10.
Figure 1-11.
Figure 1-12.
Figure 1-13.
Figure 1-14.
Figure 1-15.
Figure 1-16.

Table 1-1.
Table 1-2.
Table 1-3.
Table l-4.

Table 1-5.
Table 1-6.
Table l-7.
Table 1-8.
Table 1-9.
Table 1-10.

Table 1-11.
Table 1-12.
Table 1-13.
Table 1-14.
Table 1-15.
Table l-16.

Exterior View of the

LQ-570/1070

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

Pin Configuration

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-3

Printable Area for Cut Sheets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. 1-6

Printable Area for Continuous Sheets

. . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-6

Character Matrix

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-13

Data Transmission Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. 1-14

Control Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. 1-16

Self-Test Printout

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-20

Hexadecimal Dump Function

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-20

Lever Positions

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-24

LQ-570/l

070 Component Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-26

C062

MAIN Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. 1-26

C062

PNL Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. 1-27

C062

PSB/PSE Board

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-27

Model-5El

O/5E60 Printer Mechanism

. . . . . . . . . . . . . . . . . . . . . . . . . . .

1-28

Housing

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-28

LIST OF TABLES

Interface Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

.

1-1

Optional Units

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-2

Specifications for Cut Sheets

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-4

Specifications for Cut Sheets

(Carbonless Duplicating Paper)

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-5

Specifications for Continuous Sheets

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-5

Envelopes

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-5

Label Specifications

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-5

Printing (Text Mode)

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-10

Printing (Bit Image Mode) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. 1-11

Character Matrix and Character Size. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-12

Connector Pin Assignments and Signal Functions . . . . . . . 1-14

Settings for DIP Switch 1

(SW1)

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-18

Settings for DIP Switch 2

(SW2)..........

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-18

International Character Set Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-19

Page Length . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. 1-19

Lever Positions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

.

......... 1-24

1 -ii

REV.-B

1.1 FEATURES

The

LQ-570/l

070 are small, light-weight, low-cost, printers with advanced paper handling that is

compatible with the LQ-5 10/550/1010. The printer’s main features are as follows:

●

●

●

●

●

●

●

●

●

Use of

ESC/P

2 control codes
Ability to print multi-point fonts
Ability to receive and print raster graphic images
Compatibility with the

LQ/SQ

series available on the market

Printing speeds: 225 characters per second

(CPS)

(high-speed draft, 10 characters per inch (cpi))

252

CPS

(draft, 12 cpi)

210

CPS

(draft, 10 cpi)

84

CPS

(LQ, 12 cpi)

64

cps (LQ, 10 cpi)

Optional interface card

Clear, easy-to-read printing with standard EPSON fonts
Multiple fonts resident in the printer
9 LQ fonts (Roman, Saris

Seri~,

Courier, Prestige, Script, OCR-B, Script C, Orator, Orator-S)

1 draft font

Control panel switch selection of fonts, condensed, and cut-sheet feeder

(CSF) bin

Optional tractor unit for push-pull tractor feed
Flexible handling of continuous paper

Three ways to insert continuous paper (front/bottom/rear path)
Auto backout and auto loading (rear insertion)
Use of continuous paper without removing

CSF

Attachment of standard tractor unit in either of two positions (push/pull)
Easy handling of cut sheets with the optional cut-sheet feeder
Two ways to insert cut sheets (front/top)
Auto loading

The

LQ-570/l

070 are equipped with the standard EPSON 8-bit parallel interface. Various interface

(

options ensure compatibility with a wide variety of computers. Table 1-1 lists the interface options, Table

1-2 lists the optional units available for the

LQ-570/l

070, and Figure 1-1 shows an exterior view of

the

LQ-570/l

070.

.

Table 1-1. Interface Options

Model

Description

C82305

Serial interface card (inch screw)

C82306

Serial interface card (mini screw)

C82307

32KB serial interface card (inch screw)

C82308

32KB serial interface card (mini screw)

C82310

32KB parallel interface card

C82313

32KB

IEEE-488 interface card

Printing is not possible for the following baud rates :

1800, 200, 134.5, 110, 75 bps.

NOTES: Refer to the “Optional Interface Technical Manual” for details.

The asterisks

(’)

in the table above represent the last digit of the part numbers. This digit varies,

depending on the country. For instance, in the U.S. the last digit is 1.

1-1

REV.-B

Note:

Table 1-2. Optional Units

Model

Description

C80637*

Single-bin cut-sheet feeder (80-column)

C80638*

High-capacity cut-sheet feeder (80-column)

C80639*

SingI-bin

cut sheet feeder (1 36-column)

C80640*

High capacity cut sheet feeder (1 36-column)

C80019*

Tractor unit (80-column)

C80022*

Tractor unit (1 36-column)

7753

Fabric ribbon cartridge (80-column)

7754

Fabric ribbon cartridge (1 36-column)

7768

Film ribbon cartridge

(80-columd

1

7770

Film ribbon cartridge (1 36-column)

When a part number in the table above is followed by an asterisk (’), the last digit of the number
varies, depending on the country. For example, in the U. S., the model number for a single-bin
cut-sheet feeder (80-column) is

C80@.

3’7

(LQ-570)

(LQ-107O)

Figure 1-1. Exterior View of the

LQ-570/1070

1-2

REV.-B

1.2 SPECIFICATIONS

This section provides specifications

1.2.1 Hardware

Printing method
Pin configuration

Feeding methods

Line spacing
Paper insertion

Paper-feed speed

for the

LQ-570/l

070 printer.

Specifications

Serial, impact, dot matrix
24 wires

(12

X 2 staggered, diameter 0.2 mm)

Wires 1 Wires 2

f~
II

1,

I

ii

- ------’$

j+--------

--

-1_

1/90”

/

~ j +L____

!!’’0’”

------$ ~

~

1/90”

\ ~ +;-------

‘

-

I

//

1:

/+

w

1/60” i

i

i

1

/60”

Figure 1-2. Pin Configuration
Friction feed (front/top)
Push tractor feed (rear)
Pull tractor feed (front/bottom)

Push-pull tractor feed (with optional tractor) (rear)

1/6 inch, 1/8, or programmable in units of 1/360 inch

Friction feed Front or rear side

Tractor feed Front,

Friction without

CSF

.

Friction with CSF

Tractor

NOTE: The points below provide precautions for

bottom, or rear side

77.6

msec.(1/6-inch

feed)

2.2 inches per second

(ips) (continuous)

77.6

msec (1/6-inch

2.2

ips

(continuous)

77.6

msec (1/6-inch

2.2

ips

(continuous)

handling paper.

1. Friction feed (release lever in FRICTION POSITION).
Paper must be loaded from the front or top entrance.
Do not use continuous paper.

feed)

feed)

Do not perform any reverse paper feeds within the top 8.5 mm (.34

in.),

bottom 22 mm (.87
(top entrance), or bottom 40.2mm (1.6 in.) (front entrance) area.
Do not perform reverse feeds greater than 1/6 inch after a paper end has been detected.

in.)

1-3

REV.-B

● Use the paper tension unit.

● Do not use multi-part cut-sheet forms, except with front insertion.

● Do not perform reverse feeds greater than 1/6 inch when using envelopes.

2. Push tractor feed (release lever in REAR PUSH POSITION).
Paper must be loaded from the rear entrance.

Release the friction-feed mechanism.
Multi-part forms must be spot pasted beyond the perforation between the tractor holes.
Paper for multiple copies must be carbonless multi-part paper.
Use the paper tension unit.
Do not perform reverse feeds greater than 4/15 inch.
Since accuracy of paper feed cannot be assured after the paper end has been detected, please

do not perform reverse feeds after detection of a paper end.

3. Push-pull tractor feed (release lever in REAR PUSH POSITION).
Paper must be loaded from the front, rear, or bottom entrance.
Release the friction-feed mechanism.
Remove the paper tension unit and attach the pull tractor unit.
Ensure that there is no slack in the paper between the platen and the pull tractor.
Precisely adjust the horizontal position of the pull tractor and push tractor sprockets.
Paper for multiple copies must be spot pasted beyond the perforation between the tractor holes.
Paper for copies must be a carbonless multi-part paper.
Do not perform reverse feeds greater than 4/15 inch.
Do not perform reverse feeds after the paper end has been detected.

4. Pull tractor feed (release lever in PULL POSITION).

●

●

●

●

●

●

●

Paper must be loaded from the front or rear entrance.
Release the friction-feed mechanism.
Remove the paper tension unit and attach the pull tractor unit.
Insert the paper from either front or bottom.
Paper for multiple copies must be spot pasted beyond the perforation between the tractor holes.
Paper for copies must be a carbonless multi-part paper.

Do not perform reverse feeds.

Paper specifications See tables 1-3, 1-4, 1-5, 1-6, and 1-7

Table 1-3.

S~ecifications

for Cut Sheets (One-Part Paper)

Width

Length
Thickness
Weight
Quality

148 mm to 257

(’420)

mm (5.8 in. to 10.1 (* 16.5) in.)

(top insertion)

182 mm to 257 (*364) mm (7.2 in. to 10.1 (* 16.5) in.)
(front insertion)
364 mm (1 4.3 in.), maximum

0.065 mm to 0.14 mm (0.0025 in. to 0.0055 in.)

14 lb. to 24 lb. (52.3

g/m2

to 90

g/m2)

Standard paper (photocopier paper, etc.)
Recycled paper (at normal temperatures)

(*136-column)

1-4

REV.-B

Table 1-4. Specifications for Cut Sheets (Carbonless Duplicating Paper)

NOTES:

●

●

●

NOTES: ●

●

●

●

●

●

Width
Length
Thickness

Weight

Quality
Copies

182 mm to 216 (’364) mm (7.2 in. to 8.5 (* 14.3) in.)

257 mm to 297 mm (10.1 in. to 11.7 in.)

0.065 mm to 0.14 mm (0.0025 in. to 0.0055 in.) - single sheet

0.12 mm to 0.32 mm (0.0047 in. to 0.012 in.) - total
17 lb. to 24 lb. (52.3

g/m2 to 90

g/m2)

- single sheet

12 lb. to 15 lb. (40

g/m2 to 58

g\m2)

- each
Carbonless duplicating paper
4 sheets (1 original and 3 copies)

(*136-column

Table 1-5. Specifications for Continuous Paper

Width

101 mm to 254 (“406) mm (4.0 in. to 10.0 (* 16) in.)

Thickness

0.065 mm to 0.10 mm (0.0025 in. to 0.0039 in.) - single sheet

0.065 mm to 0.32 mm (0.0025 in. to 0.012 in.) -total

Weight 14 lb. to 22 lb. (52.3

g\m’

to 82

g/m2)

- single sheet

12 lb. to 15 lb. (40

g/m2 to 58

g/m2)

- each

Quality Standard paper or carbonless duplicating paper

Recycled paper (at normal temperatures)

Copies

4 sheets (1 original and 3 copies)

(*:1 36-column)

Table 1-6. Envelopes

Size

No. 6= 166 mm X 92 mm
No. 10= 240 mm X 104 mm

Thickness

0.16 mm to 0.52 mm (0.0063 in. to 0.0197 in.)
Differences in thickness within the printing area must be less than

0.25

mm (0.0098 in.)

Weight 12 lb. to 24 lb. (40

g/m2 to 91

g/m2)

Quality Bond paper, standard paper, airmail
Copies

Not available

Printing on envelopes is available only at normal temperatures and only using top insertion.
Keep the longer side of the envelope horizontal during insertion.
Place the left edge of a No. 6 envelope

at”the sheet guide setting mark.

Table 1-7. Label Specifications

Label size

Copies
Thickness

2 1/2 in. X 15/16 in.
4 in. X 15/16 in. “
4 in. X 1 7/16 in.
Not available

0.07 mm to 0.09 mm (0.0028 in. to 0.0031 in.) - base paper

0.16 mm to 0.19 mm

(0.0063

in. to 0.0075 in.) -total

Printing on labels is available only at normal temperatures.
Labels must be of the fanfold type.

Labels with pressure sensitive paper must be spot pasted beyond the perforation between
the tractor holes. The total thickness must be less than or equal to 0.3 mm (0.01 18 in.).
Labels can be printed out only if the temperature is between 5 and 35 degrees C (41 and
95 degrees F) and humidity is between 10 % and 80 % RH.

Examples of labels AVERY CONTINUOUS FORM LABELS

AVERY MINI-LINE LABELS
Labels must be used with the pull tractor (front or bottom).
Do not perform reverse feeds.

1-5

REV.-B

Printable area

See figures 1-3, 1-4, and 1-5

top insertion 148 - 257 mm (5.8

- 10.

1“)

148 - 257

(x

420) mm (5.8 - 10. 1“ {x 16.5))

front insertion 182

-

257 mm (7.2 - 10 1“)

182

-

257 (* 364) mm (7.2

- 10.

1“ (x 14.3’”))

.,

*

7

.,, Printable area max. 203.2 mm (8 in.)

-1 )

-1

4

~8.5

mm

‘

‘:

F

~’~~~’

7

“
t

364mm

;

(14.3”)
max.

:j

/,

*

.J-IJ&L

,,,mm

.A

(0.53”)

or more

v

Y

(* 136-column)

(80-column):

+1)

3.0 mm (O. 12 in.) or more when paper width is less than 229 mm (9 in.).
24 mm (0.9

in.)(top

insertion)\26

mm (1.0 in.)(front insertion) or more when paper width is 229 mm

(9.0 in.) to 257 mm (10.1 in.).

I

(136-column:)

3.0 mm (O. 12 in.) or more when paper width is less than 392 mm (1 5.4 in.). 29 mm (1.14 in.) (top
insertion) /31 mm ( 1.22 in.) (front insertion) or more when paper width is 392 mm (1

5.4

in.) to 420
mm (1 6.4 in.).
Paper-feed accuracy cannot be assured within 22 mm (0.87 in.) from the bottom edge of paper (top
insertion).
Paper-feed

accutacy cannot be assured within 40.2 mm (1 .58 in.) from the bottom edge of paper

(front insertion).
Paper-feed accuracy cannot be assured within 22 mm (0.87 in.) from the top edge of paper.

Figure 1-3. Printable Area for Cut Sheets

101.254 mm (4 10”)

L

101.254 x406)

(4. 10“ (x

16))
J

*

1*

Printable area

I*?

1’

Max. 203.2 mm

(8”):

80 column

1-

1

0
0
0

Printable 0
area

0

J-

0
0
0

9 mm (O 35”)

:

;r:’r;,3~,)

-:­0

or more

t

0
0
c

Printable

:

area o

I

0
0
0

Max. 345.4 mm(i 3.6”): 136 cdum

0

0
0
0
0
0

L

0
0
0
0

0

0

0

0
0
0

(’

136-column)

Figure 1-4. Printable Area for Continuous Sheets

1-6

REV.-B

(80-column):

● 1) 13 mm (0.51 in.) or more when a paper width of 101 mm (4 in.) to 241 mm (9.5 in.) is used.

24 mm (0.9

in.)(rear insertion)\ 26 mm (1.0 in.)(front/bottom insertion) or more when a paper width

of 254 mm (10 in.) is used.

(1 36-column):

13 mm (0.51 in.) or more when a paper width of 101 mm to 401.3 mm (4 in. to 15.8 in.) is used.
15 mm or more when a paper width of 381 mm to 406 mm (15 in. to 16 in.) is used. 13 mm (rear

insertion) (0.5 1 in.) /1 7 mm (front/bottom insertion) (0.67 in.) is used. ( 136-column).

Ink ribbon

Type #7753 black ribbon cartridge (80-column)

#7768 film ribbon cartridge (80-column)
#7754 black ribbon cartridge (1 36-column)

#7770 film ribbon cartridge (1 36-column)
Color Black
Life 2 million characters at 48 dots/character (black ribbon)

(80-column) 0.2 million characters at 48 dots/character (film ribbon)

(136-column) 0.3 million characters at 48 dots/character (film ribbon)
Dimensions of ribbon cartridge

Fabric Type:
(80-column): 293 mm (W) X 34 mm (H)

X 72 mm (D)

(136-column): 468.3 mm (W) X 34 mm (H) X 72 mm (D)

Film Type:
(80-column): 293 mm (W) X 34 mm (H) X 72 mm (D)
(136-column): 468.5 mm (W) X 34 mm (H) X 72 mm (D)

Mean cycles between failures

(MCBF) 3 million lines (excluding printhead)

Mean time between failures

(MTBF) 4000 power on hours (POH) (25% duty)

200 million strokes (black ribbon)
100 million strokes (film ribbon)

Safety standards UL1 950 with D3 (U.S. version)

CSA22.2#220

EN 60950 (TUV) (European version)

Radio frequency interference

(RFI)

FCC class B (U.S. version)

VDE0871 (self-certification) (European version)

Reliability

Life of

printhead

Safety approvals

Electrical specifications

120 V version

Rated voltage
Input voltage range
Rated frequency
Input frequency
Rated current
Power consumption

insulation resistance

Dielectric strength

120

VAC

103.5 to 132

VAC

50 to 60 Hz

49.5 to 60.5 Hz

2.0 A

Approx. 33 W (during a

self-

test in draft mode, 10 cpi)

10 megohms, minimum (at 500
VDC between AC line and
chassis).

1000

VAC rms for 1 minute or

1200

VAC rms for 1 second

(between AC line and chassis)

1-7

REV.-B

220 to 240 V version Rated voltage

Input voltage range
Rated frequency
Input frequency
Rated current

Power consumption

Insulation resistance

Dielectric strength

220 to 240

VAC

198 to 264

VAC

50 to 60 Hz

49.5 to 60.5 Hz

1.0 A

Approx. 33 W (during a self-test

in draft mode, 10 cpi)
10 megohms, minimum (at 500

VDC between AC line and chassis).

1250

VAC rms 1 minute or 1500
VAC rms 1 second (between AC

line and chassis)

Environmental

Temperature range 5 to 35 degrees C (41 to 95 degrees F) - operating

conditions

–30 to 60 degrees C (–22 to 140 degrees F)

– in shipment container

Humidity

10 to 80 % RH - operating

5 to 85 % RH – storage

Resistance to shock 1 G, within 1 ms – operating

2 G, within 1 ms - storage

Resistance to

0.25 G, 55 Hz, max. - operating

vibration

0.50 G, 55 Hz, max. - storage

Physical specifications (80-column):

Weight 6.1 kg,

approx. (13.5 Ibs., approx.)

Dimensions 434 mm (width) X 368 mm (depth) X 151 mm (height)

17.4 in. (width) X 14.7 in. (depth) X 6 in. (height)
(136-column):
Weight 8.4 kg,

approx. (1 8.6 Ibs., approx.)

Dimension 609 mm (width) X 368 mm

(depth)X

151 mm (height)

24.4 in. (width X 14.7 (depth) X 6 in. (height)

1-8

REV.-A

1.2.2 Firmware Specifications

Control code

ESC/PTM level

ESC/P

2

(EPSON standard code for printers)

Printing direction

Bidirectional with logic seeking

Input data buffer

8KB (when SW 1-7 is OFF)
OKB (when SW 1-7 is ON)

Character code

8 bits

Character tables

Italic character table, PC 437, PC 850, PC 860, PC 863, PC 865
(PC indicates character table for personal computer)

Fonts and pitches

Bit-map fonts

EPSON Roman

10, 12, 15, proportional

EPSON Saris

Serif

10, 12, 15, proportional

EPSON Courier

10,

12,

15

EPSON Prestige

10, 12

EPSON Script

10, 12

EPSON Script C

proportional

OCR-B

10

EPSON Orator

10
EPSON Orator-S 10
EPSON Draft

10, 12, 15

Scalable fonts

EPSON Roman

8 pt to 32 pt

EPSON Saris Serif 8 pt to 32 pt

Printing modes

Selection and mixture of the following modes are allowed, excluding 15 cpi
condensed mode:

O Print quality (draft/letter quality)
O Character pitch (10, 12, 15, or proportional)
O Condensed
O Double-width
O Double-height
O Emphasized
O Double-strike
O Italic
O Underlined
O

Double-underlin~d

O Overscore
O Strike-through
O Outline
O Shadow

1-9

REV.-B
NOTES: High-speed draft is valid if the printer status is as follows:

●

●

●

●

●

●

●

●

High-speed draft is selected by DIP switch.

Emphasized character mode is not selected.
Condensed character mode is not selected.
Draft is selected.
No D/L (download) characters are sent to the printer,

The horizontal dot space of characters is not set.

No bit image is sent to the printer.

Super/subscript is not selected.
(The printer switches back into normal mode to print emphasized, condensed, or download
characters and bit images.)

Printing speed See tables 1-8 and 1-9.
Printing columns See Table 1-8.

Character matrix See Table 1-10.

Character size See Table 1-10.

Table 1-8. Printing (Text Mode)

T

Printable Character Pitch

Printing Speed

(CPS)

Print Pitch

Condensed

Columns

(cpi)

Draft

LQ

HSD

10

0 80 (* 136)

10

210

70 225

1

137 (“233)

17.1

180 120 —

12

0

96 (* 164)

12

252 84 —

1

160 (*272)

20

210

140 —

15

0

120(”204)

15

315

105 —

1

Invalid

I

(* 136-column)

cpi:

characters per inch

Cps:

characters per second

LQ:

letter quality

HSD:

high-speed draft

1-10

Table 1-9.

REV.-B

Printing (Bit Image Mode)

(

Pins

I

Bit Image Printing Mode

I

Density

(dpi)

}

Printable Dots

I

Printing Speed

(ips)

8

Single-density

60

480 (*8 16)

21.0

8

Dual-density

120

960

(“

1632)

10.5

8

I

Double-speed, dual-density

I

120

I

960 (“1632)

I

21.0

8

Quadruple-density

240

1920 (*3264)

10.5

8

CRT graphics

80 640 (“ 1088)

10.5

8

I

CRT graphics

II

I

90

I

720 (“1224)

I

14.0

24

Single-density

60

480 (*8 16)

21.0

24

Dual-density

120 960 (“ 1632) 10.5

24 CRT graphics II

90

720 (“224) 14.0

24

Triple-density

180

1440 (“2448) 7.0

I

24

Hex-density

360

2880 (*4896) 7.0

(* 136-column)

dpi: dots per inch

ips:

inches per second

1-11

REV.-A

Table 1-10. Character Matrix and Character Size

Printing Mode

I

Face Matrix

I

HDD I Character Size I Unit

ESC

sp

High-speed draft, 10 pitch

7

x

22

90 2.0 x 3.1

—

Draft, 10 pitch

9 x 22 120

1.9 x 3.1

120

Draft, 12 pitch

9 x 22

120 1.9 x 3.1

120

I I

I

I

Draft, 15 pitch

7 X 16 120

1.0 X 2.3

120

Draft, 10 pitch, condensed

—

240

—

120

Draft, 12 pitch, condensed

—

240

—

120

LQ,

10 pitch

31 x 22 360 2.2 x 3.1 180

LQ,

12 pitch

27 X 22 360

1.9 x

3.1

180

LQ,

15 pitch

22 X 16

360 1.6 X 2.3

180

LQ,

10 pitch, condensed

—

360

—

180

LQ,

12 pitch, condensed

l–

I

360

I

–

I

180

LQ,

proportional Max. 37 X 22

360

2.6 X 3.1

180

Min. 18 X 22

360

1.0 x 3.1

LQ,

proportional, condensed

—

360

—

180

—

360

—

LQ,

proportional, super/subscript

Max. 28 X 16 360 1.8 X 2.3 180

Min. 12 X 16 360 0.7 X 2.3

LQ,

proportional, super/subscript,

I

—

I

360

I

—

I

180

condensed

—

360

—

NOTES: .

HDD is horizontal dot density in dots per inch.

● Face matrix and character size indicate the size of the maximum character. This value is

dependent on paper, ribbon, etc.

● Unit ESC sp (which also can be sent as unit, followed by the character string CHR(&h20)),

indicates the minimum length to be added to the right of the character specified with the

ESC

sp control code.

● “-”

indicates that the character matrix is reshaped by printer firmware. Character width

becomes half of the noncondensed character width.

1-12

REV.-A

1

2
3

4

:

7
8

9
10
11
12
13
14
15
16
17
18
19

20
21

22
23
24

(Typical draft character)

L
E
F

T

s
P

A
c

E

Ascender area

!-

Descender area

I

.

R

I

G
H
T

s

P

A

c

E

Face width

<

9

dots

>

Character width (CW)

12 dots (10

CPI)

120

DPI

15 dots (12

CPI)

180

DPI

16 dots (15

CPI)

240

DPI

14 dots (condensed 10

CPI)

240

DPI

12 dots (condensed 12

CPI)

240

DPI

9
10
11

12

13
14
15
16
17
18
19
20
21
22
23
24

L
E
F

T

s

P

A

c

E

(Subscript character)

—

R

I
G
H

T

s
P

A

c

E

—

1

2

3

4

5
6
7
8
9

10

11
12
13

14

15
16
17
18

19
20
21
22
23

24

(Typical LQ character)

L
E
F
T

s
P
A

c
E

Ascender area

I

Descender area

R

I

G
H
T

s

P
A
c

E

Face width

<

9

29 dots

(Typical

LQ,

excluding 15 pitch)

15 dots for

15 pitch and condensed

La

+

36 dots (10 CPI)’360

DPI

30 dots (12

CPI)

360

DPI

24 dots (15

CPI)

360

DPI

21 dots (condensed 10

CPI)

360

DPI

18 dots (condensed 12

CPI)

360

DPI

.

1

2
3
4
5
6
7
8
9

10

11
12
13
14
15
16

L
E

F

T

s

P

A

c
E

(Subscript character)

—

R

I

G
H
T

s
P
A

c
E

—

Figure 1-5. Character Matrix

1-13

REV.-A

1.3 INTERFACE OVERVIEW

The printer has a parallel interface with the specifications described below.

1.3.1 Parallel Interface

Specifications for the 8-bit parallel interface are as follows:

Data format
Synchronization
Handshaking

Signal level

Adaptable connector

Data transmission timing

BUSY

ACKNLG

DATA

STROBE

8-bit parallel
STROBE signal
BUSY and

ACKNLG signal

TTL-compatible

57-30360 (Amphenol) or equivalent
See Figure 1-6.

{

~;

o.5/is

o.5Lls

0.5/S

5/S

5/.fs

min.

min.

min.

typ.

typ. ‘

Figure 1-6. Data Transmission Timing

Table 1-11 shows the connector pin assignments and signal functions of the 8-bit parallel interface.

Table 1-11. Connector Pin Assignments and Signal Functions

Pin No.

Signal Name

Return

Pin No.

Dir. Functional Description

1

STROBE

19

IN

STROBE pulse to read the input data. Pulse width must
be more than 0.5ps. Input data is latched at falling
edge of this signal.

2

DATA 1

20

IN

Parallel input data to the printer.

3

DATA 2

21

IN

HIGH level means data 1.

4

DATA 3 22

IN

LOW level means data O.

5

DATA 4 23

IN

6

DATA 5 24

IN

7

DATA 6 25

IN

8

DATA 7 26

IN

9

DATA 8

27

IN

10

ACKNLG

28

OUT

This pulse indicates data has been received and the
printer is ready to accept more data. Pulse width is
approximately 11

Ks.

11

BUSY

29

OUT

HIGH indicates the printer cannot accept more data.

12

PE

30

OUT

HIGH indicates paper out. This signal is effective only

when the ERROR signal is LOW.

13

SLCT

—

OUT

Always HIGH output. (Pulled up to +5

Vthrough

a 3.3K

ohm resistor.)

1-14

Table 1-11. Connector Pin Assignments and Signal Functions (Cont.)

Pin No. Signal Name

Return

Pin No.

Dir.

Functional Description

14 AUTO FEED-XT

—

IN

If LOW when the printer is initialized, the printer
automatically performs a line feed upon input of the
CR code (Auto LF).

15

Not used.

16

GND

—

Ground for twisted-pair grounding.

17

Chassis

GND

—

—

Chassis ground level of printer.

18

Not used.

19

to 30

GND

Ground for twisted-pair grounding.

31

I NIT

16

IN

Pulse (width: 50ws, min., active LOW) input for printer
initialization.

32

ERROR

OUT

LOW indicates an error has occurred in the printer.

33

GND

—

—

Ground for twisted-pair grounding.

34

Not used.

35

OUT

Always HIGH. (Pulled up to

+5V

through 3.3K ohm

resistor.)

36

SLCT-IN

—

IN

DC

l\DC3

control is disabled.

NOTES: 1. “Dir.” indicates the direction of the signal flow as viewed from the printer.

2. “Return Pin No.” denotes a twisted-pair return line.

3. The cable used must be shielded to prevent noise.

4. All interface conditions are based on TTL levels. Both the rise and fall times of all signals
must be less than

0.21.Ls.

5. The AUTOFEED-XT signal can be set to LOW by DIP switch 2-4.

6. The SELECT-IN signal can be set to LOW by jumper 3.

7. Printing tests, including those of the interface circuits, can be performed without using

external equipment by setting DATA 1- DATA 8 pins to the STROBE signal.

1-15

REV.-A

1.4 CONTROL PANEL

On the control panel are: a power button (labeled OPERATE), 7 non-lock type buttons, and 19 indicators.

Figure 1-7. Control Panel

BUTTONS

(1) OPERATE Button

This button turns on the power supply to the printer.

(2) PAUSE Button
This button controls printer action. Pressing the button toggles the printer between PAUSE condition
(no printing, no paper feeding, and not accepting data) and RUNNING. This button is also used in
conjunction with the

ALT button as a buffer clear to clear the input buffer and perform software

initialization, as if ESC

@

had been received.

(3) LINE FEED/FORM FEED Button
Pressing this button performs a line feed, and holding down the button performs a form feed,
irrespective of the PAUSE/RUNNING condition. This button is also used in conjunction with the

ALT

button as the micro reverse feed.

(4) LOAD/EJECT Button
Pressing this button loads or ejects the paper. Refer to Section 1.6.8, Sheet Loading and Sheet Ejection.

This button is also used in conjunction with the

ALT button as the micro forward feed.

(5) TEAR-OFF/BIN

l\BiN

2 Button

In tractor-feed mode, pressing this button advances continuous paper to the tear-off position, and the
TEAR-OFF indicator is lit. In friction-feed mode, pressing this button toggles between bin 1 and bin 2,
and the selected BIN indicator is lit.

(6) ALT Button

This button is used only in combination with another button,

1-16

REV.-A

(7) FONT Button

Pressing this button selects a font, and pressing it continuously selects the next one, sequentially. The

FONT LED indicates the currently selected font.

(8) CONDENSED Button
Pressing this button toggles the printing mode between normal and condensed, alternatively.

NOTE: Selections of the FONT and CONDENSED buttons

and the CONDENSED selection become effective

INDICATORS

(1) OPERATE (green)

are stored as defaults, so that the last FONT
when the printer is initialized.

Lit when the printer’s OPERATE button is on, and AC power is supplied.

(2) PAUSE (orange)

Lit

(3)
Lit

(4)

Lit

(5)

when the printer is in PAUSE-mode (no printing, no paper feeding, and not accepting data).

TEAR-OFF (orange)

when the sheet is advanced to the tear-off position.

DATA (orange)

when the printer has received data from the host. .

PAPER-OUT (red)
Lit when the paper-out detector senses no paper. Refer to Section 1.6.3, Paper-out Detection and Forms
Override Function.

(6) MULTI-PART (green)
Lit when the adjust lever is

(7) BIN 1 (green)

Lit when bin 1 is selected.

(8) BIN 2 (green)

Lit when bin 2 is selected.

positioned at the 4th step or higher,

(9) FONT (green) - Draft, Courier, Roman, Saris Serif, Prestige, Script, Script C, Orator, Orator-S, OCR-B
These indicators show the currently selected font.

(10) CONDENSED (green)
Lit when condensed mode is selected.

1-17

REV.-A

1.5 DIP SWITCHES AND

This section describes the DIP switch

1.5.1

DIP Switch Settings

JUMPER SETTING

selections and jumper setting for the

LQ-570

printer.

The two DIP switch banks for the printer, located on control panel, function as shown in tables 1-12
through 1-15. (Note that the status of the DIP switches is read only at power on or upon receipt of the

INIT signal.)

Table 1-12. Settings for DIP Switch 1

(SW1)

No.

I

Description

1

2

International character set and PC selection

3

I 4 I

Charactertable selection

I

5 I Graphic print direction

I

6 I High-speed draft

7

Input buffer

8

l-inch

skiD

continuous

~aDer

ON

OFF

Factory
Setting

ON

See Table 1-14.

ON
ON

Graphic

Italic

OFF

Unidir.

Bidir.

OFF

Invalid Valid

OFF

Invalid Valid

OFF

ON

I

OFF

I

OFF

Table 1-13. Settings for DIP Switch 2

(SW2)

t

No.

Description

ON

OFF

Factory

Setting

1

Page length of continuous paper

See Table 1-15.

OFF

2

OFF

3

Auto tear-off

ON

OFF

OFF

4

Auto LF

ON

OFF OFF

1-18

REV.-A

Table 1-14. International Character Set Selection

1-1

1-2 1-3

Country

Pc

ON

ON ON

Us.

437

ON

ON

OFF

France

850

ON

OFF ON

Germany

860

ON

OFF

OFF

U.K.

863

OFF

ON ON

Denmark 1

865

OFF

ON

OFF

Sweden

(437)

OFF

OFF

ON

Italy

(437)

OFF

OFF OFF

Spain 1

(437)

L

—

When SW 1-4 is OFF,

If graphic table was selected by

ESC

t 1, PC becomes 437.

When SW 1-4 is ON,
if italic table was selected by

ESC

t O, country setting becomes U.S.

Table 1-15. Page Length

2-1

2-2

Page Length

OFF

OFF

11 inches

ON OFF

12

inches

OFF

ON

8.5 inches

ON ON

70/6 inches

1.5.2 Jumper Setting

If Jumper 3 is connected to GND, the SLCT-IN signal is fixed to LOW.

1.

1-19

REV.-A

1.6 OPERATING INSTRUCTIONS

This section describes the self-test and hexadecimal dump functions and also includes the error states,
printer initialization, and buzzer operation.

1.6.1 Self-Test

To run the self-test using draft mode, turn the printer on while pressing the LOAD/EJECT button. To

run the self-test using the letter quality (LQ) mode, turn the printer on while pressing the LINE

FEED\FORM FEED button. You can stop or start self-test printing by pressing the PAUSE button. When

you are satisfied with the self-test, stop the printing by pressing the PAUSE button and turn the printer
off.

The firmware revision number is printed on the first line of the self-test, followed by the current DIP
switch settings.

Xxxxxx
Country/PC

U.S.A.

France
German

y

(J.

K .

Oe nma r k
Swedeil

I

ta 1 ?

S pd 1

i

I

‘c

437

‘-

.

.

(j

Swl-1

1-2 1“3 1-4

on on

on

off

o n o n off

off

on

off Orl

off

on

off off off

off

on on

off

o f f“

o n

Ot f

oft

o

t f’ o I t o n

of

f

(,I f f ~ t

f ~ f f ~ f f

on on

on

,:.)

I I

~

High

speed draft

SWI-6

Va 1

id

off

Invalid on

Receive buffer SW1-7

Valid

off

I

nva

1

i

d

o n

1 inch

skip

SW1-8

1 rival

id

off

‘ ~ ~

I ;

~

to f I

k

SW2-1 2-2

off off

~

t i

Figure 1-8. Self-Test Printout

1.6.2 Hexadecimal Dump Function

To put the printer in hex. dump mode, power it on while pressing both the LOAD\ EJECT and LINE

FEED\FORM FEED buttons. In hex. dump mode, the printer prints out the hexadecimal representation

of the input data, along with the corresponding ASCII characters. This function is valuable for checking
the data the printer has received from the host. If input data is a nonprintable character code, a period
(.) is printed in the ASCII column.

:6 40

LB 52 00 IB

20 20 54

68

69 73

bD

70 6C 65 20 6F

75

6D 70

20 70 72

69

73 20 66 65

61

0.4 20 20 20 20 20

74 01

IB

36 12 LB 50 18 70

20 69

73 20 61 6E 20 65 78

66 20 61 20 64 61 74 61 20
69

6E 74 6F 75 74 2E 20 54

74

75

72 65 20 6D 61 6B 65

69 74

20

65 61 73 79 20 66

Figure 1-9. Hexadecimal Dump

00

.@. R. . t. .6.

.P.

D.

61

This is an exa

64

mple of a data d

60

ump printout. Th

73 is f ea

tu

re makes

6F .

i

t easy fo

Function

1-20

REV.-A

1.6.3

Paper-out Detection and Forms Override Function

When the paper-out detector, attached to the printer mechanism, detects a paper-end, the printer first
performs a forms override. If paper loading fails, the BUSY signal goes HIGH, the PAPER OUT indicator
is lit, the interface PE signal becomes HIGH, the ERROR signal becomes LOW, and the printer enters

the PAUSE condition automatically.

By ignoring the paper out, the printer can print additional lines after the paper out is detected. This
function is called the forms override function. After you load new paper and press the PAUSE button,
the printer recovers to the RUNNING condition, and printing restarts.

The printer enters the paper-out condition only when a paper-out is detected after the printer performs
paper loading.

1.6.4 Error Conditions

If any of the following error conditions are detected, the printer automatically enters PAUSE condition.

●

●

●

●

Home position is not detected at printer mechanism initialization.

Home position is detected during printing.
The PAUSE button is pressed, and the printer enters PAUSE condition.
A paper-out is detected after performing paper loading operation.

If parallel interface is selected, the following interface signals are output to indicate the error and to

stop data transmission:

The BUSY signal becomes HIGH.
The ERROR signal becomes LOW.

No ACKNLG pulse is sent.

1.6.5 Buzzer Operation

The buzzer sounds under the following conditions:

. A paper-out error is detected (beeps 3 times for 0.1 second, with 0.1 second intervals).

● Abnormal carriage movement is detected (beeps 5 times for 0.5 second, with 0.5 second intervals).

● A panel setting is accepted

1.6.6

Printer Initialization

There are three initialization

initialization.

(1) Hardware initialization

(O. 1 second beep).

methods: hardware

initialization, software initialization, and panel

This type of initialization takes place when the printer power button is turned on (and the AC power
cord is plugged in) or when the INIT signal is received.

When the printer is initialized, it performs the following actions:

1-21

REV.-A

(a) Initializes printer mechanism.
(b) Clears input data buffer.
(c) Clears downloaded character set.
(d) Clears print buffer.
(e) Returns printer settings to their default values.

(2) Software initialization

Input of the

ESC @

command also initializes the printer. Printer initialization by ESC @ code does not

perform functions (a), (b), and (c) above. The settings changed by the last

SelecType

operation are

maintained.

(3) Panel initialization

This printer can be initialized by pressing the PAUSE button in combination with the ALT button. When

the printer is initialized from the front panel, functions (a) and (c) above are not performed. The settings

changed by the last

SelecType

operation are maintained.

1.6.7 Default Values

When the printer is initialized, the following default values are set:

Page position
Left and right margins
Line spacing
Vertical tabs
Horizontal tabs
Family number of type style
Download characters

Character spacing

Printing effects

Condensed printing

Printer condition

The current paper position becomes the top-of-form position
Released

1/6 inch
Cleared
Every 8 characters (relative)
Last font selected from the panel
Kept - software initialization
Cleared – hardware initialization

10 cpi

Cleared, except condensed printing

Last setting selected from the panel

RUN

1.6.8 Sheet Loading and Sheet Ejection

The release lever can disengage the pull-tractor unit drive mechanism, giving this printer improved
paper-handling for functions that utilize the release lever. These functions are described below:

Automatic cut-sheet loading without the cut-sheet feeder

Move the release lever to the friction-feed position, and place the sheet along the paper guide (top or
front). A few seconds later, the sheet is automatically loaded to the top-of-form position and the printer
enters the RUNNING condition.

1-22

REV.-A

Automatic cut-sheet loading and ejection with cut-sheet feeder

Move the release lever to the friction-feed position, and place the sheets into the hopper of the cut-sheet
feeder. Pressing the LOAD/EJECT button loads one sheet to the top-of-form position. If a paper-out is
detected before printing starts, a sheet will again be loaded automatically to the top-of-form position.

Continuous paper loading and ejection

(backout)

Move the release lever to the REAR PUSH position, and insert the paper into the tractor unit. Pressing
the LOAD/EJECT button loads the paper automatically to the top-of-form position. If a paper-out is
detected before printing starts, the paper will be loaded automatically to the top-of-form position.

If the LOAD/EJECT button is pressed after continuous paper has been loaded, the paper is ejected
backward to the push tractor unit. To back out several pages, press the LOAD/EJECT button several

times. Each time LOAD/EJECT is pressed, reverse feed is performed for a single page.

When the paper is at the current setting for the top-of-form position, the top-of-form adjustment function
is valid for the next loaded

positicrn.

At this time, the LOAD\ EJECT button advances the paper forward,

and the LINE FEED/FORM FEED button moves the paper backward.

The adjusted top-of-form position for continuous paper is saved in EEPROM, but the setting for cut sheet
paper is not saved.

1.6.9 Tear-off Function

The below tear-off function is limited under the push tractor mode.
Auto-tear-off

The auto-tear-off function is enabled by DIP switch setting. When this function is enabled and the release
lever is in the tractor position, the paper advances to the tear-off position automatically if the input data
buffer is empty and the printer is in the RUNNING condition. The TEAR-OFF LED lights to indicate that
you can use the LOAD/EJECT and LINE FEED/FORM FEED buttons, in combination with the ALT button,

for backward and forward micro feed adjustment.

Using micro feed, adjust the paper to meet the tear-off edge. Once the tear-off position is set, this setting
remains valid even after the printer is turned off or initialized. If subsequent data is sent to the printer,
the paper returns to the original position automatically and printing starts. If the PAUSE button is pressed
while the paper is advanced to the tear-off position, the paper returns to the original position (and the
printer enters the PAUSE condition).

1-23

REV.-B
Short-tear-off

To access the short-tear-off function, press the TEAR-OFF button. The release lever must be in the tractor
position. The paper advances to the tear-off position whether the printer is in PAUSE or RUNNING
condition. At this time, the TEAR-OFF LED lights to indicate that you can use the LOAD/EJECT and LINE
FEED/FORM FEED buttons, in conjunction with the ALT button, for backward and forward micro feed

adjustment. Using micro feed, adjust the paper to meet the tear-off edge. Once the tear-off position

is set, this setting remains valid even after the printer is turned off or initialized. If subsequent data is
sent to the printer and the printer is in the RUNNING condition, the paper returns to its original position
automatically and printing starts. If the TEAR-OFF button is pressed again while the paper is advanced

to the tear-off position, paper returns to its original position whether the printer is in PAUSE or RUNNING
condition.

I 1.6.10 LEVER, G, ADJUST Operation

The LEVER ,G, ADJUST must be set to the proper position for the paper thickness. If this lever has been

set to the 4th step or higher, printing speed is reduced and the head energy is increased.

Table 1-16. Lever Positions

I

Lever Position

I

Paper Thickness

I

I

NOTE: If printing density becomes lighter, adjust the LEVER, G, ADJUST position one step higher.

1 position (3rd step)

A

,DJUST

Figure 1-10. Lever Positions

1-24

REV.-A

1.6.11 Printer Protection

for Heavy-Duty Printing

This printer has a printhead protection function to prevent it from overheating and to protect the printer
when the head driver voltage drops. If head temperature exceeds its maximum value, printing stops
automatically until the head temperature drops to a certain value before printing resumes. Printing

resumes at a lower print speed at first.

However, as the head temperature decreases, print speed increases to normal speed automatically. If
the head temperature continues to increase at the lower speed, printing is stopped or resumed as
temperature increases or decreases.

If the voltage supplied to the head drive circuit drops below its minimum limit as a result of heavy-duty
printing, printing is interrupted immediately. When the power supply voltage recovers to a certain value,
the remaining print line is printed at half speed. This protective action occurs when half or more of the
wires are activated continuously.

1-25

REV.-B

1.7 MAIN COMPONENTS

I

I

The main components of the

LQ-570/l

070 printers are designed

to maintain and repair the printer. The main components are:

for easy removal and replacement

1)

C062

MAIN board:

the main control board; the CPU on this board controls all main functions.

2)

C062

PNL board:

the control panel board.

3)

C062 PSB\PSE

board:

the power supply board.

4) M-5

E10/5E60:

the printer mechanism.

C062 PSB/PSE Board

C062 MAIN Board

&

I

r

1

,Y

7

,U

“.0

l-l

i

9

p u

xx &

1-

d -1

rlq

i\ ~

h 11 J \

Printer Mechanism M-5E60

Printer Mechanism

M-5E

10

(LQ-570)

(LQ-1

070)

Figure 1-11.

LQ-570/1070

Component Layout

1.7.1

C062

MAIN Board (Main Control Circuit Board)

The

C062

MAIN Board for the

LQ-570

consists of a TMP90C041 N 8-bit CPU, an E05A50 gate array,

a PROM (5 12K), a PSRAM (256 K), a mask ROM (character generator,

2M),

an EEPROM, and a hybrid

IC (STK-6022B).

In addition to this, the board for the

LQ-1

070 also includes a SRAM (64 K).

(80-column)

Figure 1-12.

C062

MAIN

(1 36-column)

Board (80-column and 136-column)

1-26

REV.-B

1.7.2

C062 PNL

Board (Control Panel Circuit Board)

The

C062

PNL board is the

LQ-570\1070

control panel, which includes the indicator

LEDs,

switches, I

and DIP switches.

Figure 1-13.

C062 PNL

Board

1.7.3

C062

PSB/PSE Board (Power Supply Circuit Board)

The power supply unit consists of a switching regulator circuit, which converts the AC line voltage to
the DC voltages (for example,

+35V

and + 5V) used by the printer. The

C062

PSB board is 120V input

type, and the

C062 PSE

board is 220\240V input type.

o

f-

:

o

m

OFOM

(a,

o.

I

~D

E

o

Figure 1-14.

C062 PSB/PSE

Board

.

1-27

I

I

REV.-B

1.7.4 Printer Mechanism (M-5

E10/M-5E60)

The M-5E

10/M-5E60

printer mechanism was developed specifically for use with

LQ-570/l

070 printer.

The components include a carriage motor,

carriage mechanism, paper-feed motor, paper-feed

mechanism, ribbon-feed mechanism, printhead, and sensors. This printer mechanism allows three ways
of paper insertion.

1.7.5 Housing

The

LQ-570/l

070

Figure 1-15.

Model-5El O/5E60

Printer Mechanism

This picture shows
an 80-column Printer.

The

M-5E1O

and

M-5E60

differ in

width only.

housing consists of the upper, lower, and front cases. The front case houses the

control panel board. The lower case contains the printer mechanism,

the main control circuit board,

and power supply circuit board.

(LQ-570)

(LQ-1

070)

Figure 1-16. Housing

(LQ-570/LQ-1070)

1-28

REV.-B

2.1

2.2

2.3

CHAPTER 2

OPERATION PRINCIPLES

OVERVIEW OF PRINTER MECHANISM OPERATION . . . . . . . . . . . . . . . 2-1

2.1.1

Printhead

Mechanism

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

.

2-1

2.1.2

carriage

Movement Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

.

2-2

2.1.3 Paper Feed Mechanism

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2-3

2.1.3.1 Paper Advance Mechanisms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

.

2-3

2.1.3.2 Paper Insertion Entrances ......................................."."" 2-6

2.1.4 Ribbon Advance Mechanism ..................................."""..."..."."-

2-10

POWER SUPPLY OPERATlON......................................."..."....m""..".....

2-11

2.2.1 Power Supply Overview

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2-11

2.2.2 SupPly Circuit Operation .....................

m

........

oc...........j"

".

O""..O...

2-11

CONTROL CIRCUIT OPERATION

.......................................•

S

.."

OW..-

2-13

2.3.1

2.3.2

2.3.3

2.3.4

2.3.5

2.3.6

2.3.7

2.3.8

Figure 2-1.
Figure 2-2.
Figure 2-3.

Figure 2-4.
Figure 2-5.
Figure 2-6.
Figure 2-7.
Figure 2-8.
Figure 2-9.

(

Control

circuit

Operation Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13

Reset Circuit

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2-15

Sensor Circuits

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2-16

MOTOR, CR Drive Circuit

..............................................."......

2-17

MOTOR, PF Drive Circuit

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2-18

Printhead

Drive Circuit ..........................................S....S...........

2-19

Parallel Interface Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. 2-20

EEPROM Control Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. 2-20

LIST OF FIGURES

HOW

the Printhead

Works . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

.

2-1

Carriage Movement......................................"......."......"......... 2-2

Paper-Thickness Gap LEVER, G, ADJUST
Movement

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

.

2-2

Top Entrance Friction Feed

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2-3

Push Tractor Operation

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

.

2-4

Pull Tractor Operation

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2-5

Push-Pull Tractor Operation

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5

LEVER, RELEASE Movement ..................................o.......... 2-6

Paper Path for Top Entrance Friction Feed .................. 2-6

Figure 2-10. Paper Path for Rear Entrance Push Tractor Feed. . . . . . 2-7

Figure 2-11. Paper Path for Rear Entrance Push-Pull

Tractor Feed

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

.

2-7

Z.i

REV.-B

Figure 2-12. Paper Path for Bottom Entrance Pull Tractor Feed... 2-8

Figure 2-13. Paper Path for Front Entrance Friction Feed. . . . . . . . . . . . . . . 2-9

Figure 2-14. Paper Path for Front Entrance Pull Tractor Feed. . . . . . . 2-9

Figure 2-15. Ribbon Advance Mechanism

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2-1o

Figure 2-16. Power Supply Circuit Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12

Figure 2-17. Control Circuit Block Diagram

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2-13

Figure 2-18. Data Flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. 2-14

Figure 2-19. Reset Circuit Block Diagram

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2-15

Figure 2-20. RESET Signal Timing

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2-16

Figure 2-21. Sensor Circuit Block Diagram

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

.

2-16

Figure 2-22. MOTOR, CR Drive Circuit

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2-17

Figure 2-23. MOTOR, PF Motor Drive Circuit

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

.

2-18

Figure 2-24. Printhead Drive Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

.

2-19

Figure 2-25. Head Drive Signal Output Timing

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2-19

Figure 2-26. Parallel Interface Circuit

.......................................#.............

2-20

Figure 2-27. EEPROM Control Circuit

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2-20

LIST OF TABLES

Table 2-1.

Paper Advance Methods and Paper Paths ................... 2-3

Table 2-2.

Ribbon Advance Gear Linkage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. 2-10

Table 2-3.

Power Supply Boards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

.

2-11

Table 2-4.

Power Supply Output Voltages and Applications ...... 2-11

Table 2-5.

Functions of the Main

IC

and Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14

Table 2-6.

MOTOR, CR Drive Modes

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2-17

Z.ii

REV.-B

2.1 OVERVIEW OF PRINTER MECHANISM OPERATION

This section describes the PRINTER MECHANISM of the

Model-5E 10\5E60

printer unit and explains

how the printer works. The

Model-5E 10/5E60

has a PRINTER MECHANISM that features a 24-pin impact

I

dot

printhead

for serial printing. There are four main parts to the printer mechanism: 1) the printhead
mechanism, 2) the carriage movement mechanism, 3) the paper advance mechanism, and 4) the ribbon
advance mechanism. Each of these is described below.

2.1.1

Printhead

Mechanism

The printhead mechanism consists of the

printhead

itself, the ink ribbon, and the PLATEN. The printhead
contains 24 wires in a zigzag arrangement in two rows of 12. A drive coil is provided for each of these
wires to make the wires move in and out of the

printhead

and print dots independently of each other.

The basic way that the wires are driven is described in the four steps below.

1.

2.

3.

4.

The control circuit outputs the drive signal to the

printhead

drive circuit. This changes the

printhead

drive voltage, and current flows through the corresponding

printhead

coil. The coil acts as a solenoid
and generates a magnetic force.
This induced force causes the plate to approach the coil rod and the associated dot wire is rapidly
ejected to impact on the platen.

The dot wire presses the ink ribbon up against the paper as it hits the platen, and in this way prints
a dot on the paper.
As soon as the current

througk the coil is switched off, the force induced in the coil rod stops. The

plate then returns to its original position (its position before the coil was energized) through the action
of the plate spring. After the dot wire hits the platen, the rebounding force of hitting the platen works

together with the wire return spring to pull the wire back to its original position in relation to the

plate.

Dot

Wire

RIBBON

Wire Resetting Spring

Stopper

\\

/

Actuating

PLATEN

MASK

f

n-lo-e

~~1~..ad.rivin9coi,

Paper

Actuating plate

Sprin9

Figure 2-1. How the

Printhead

Works

Figure 2-1 shows the action of the PRINTER MECHANISM when a single dot is printed. The printhead

tends to heat up after a period of continuous printing. To minimize the possibility of the dot wire drive

coils overheating within the

printhead

and any loss of performance, the head is equipped with a

thermistor that detects the head temperature. When this thermistor detects changes in the

printhead

temperature, the voltage signal changes. This signal change is read by the control circuit for feedback
control.

2-1

REV.-B

2.1.2 Carriage Movement Mechanism

A timing belt is connected to the carriage on the lower side. With the printhead installed, this carriage
moves in either direction along the SHAFT, CR, GUIDE. The carriage is driven by the MOTOR, CR a
stepping motor that drives the TIMING BELT via the BELT PULLEY. The DETECTOR

ASSY.,

HP DETECTS

when the carriage is in the home position.

DETECTO

Left

I

$!!!!%

\

Carriage

(

SHAFT, CR, GUIDE

h

MOTOR, CR

BELT PU”LLEY

Figure 2-2. Carriage Movement

The paper-thickness LEVER, G, ADJUST allows the printer to use different weights of paper (different
thicknesses). The user controls this lever and alters the platen gap on the SHAFT, CR, GUIDE by changing

its position. Changing the position of the lever rotates the CHAFT, CR, GUIDE and moves the carriage
either toward or away from the PLATEN. Moving the paper-thickness LEVER, G, ADJUST to the fourth
position or higher slows down the printing speed to protect the

printhead. The PG sensor reads the

current position of the paper-thickness LEVER, G, ADJUST.

.

PLATEN

ADJUST

ASSY., PLATEN

Figure 2-3. Paper-Thickness LEVER, G, ADJUST Movement

2-2

REV.-B

2.1.3 Paper Feed Mechanism

Cut sheet paper is advanced by friction feed. Continuous form paper is advanced using a tractor feed

mechanism.
There are three ways to advance the paper with tractor feed: using the push tractor, using the pull tractor,

and using the push and pull tractors together. Any one of these three tractor configurations can feed

paper through the printer. In normal operation, the printer is set up with one tractor, which functions
as either a push tractor or pull tractor, depending on where it is attached to the printer body. To use

the push-pull tractor feed method, an optional tractor must be attached in addition.
There are also four ways to insert paper into the printer. Different paper paths are used for different

types of paper. Table 2-1 lists which paper paths can be used for each of the various paper advance

methods.

Table 2-1, Paper Advance Methods and Paper Paths

Paper Insertion (Paper Paths)

Paper Advance Method

Rear

Front

Bottom

Top

Entrance Entrance

Entrance

Entrance

Friction Feed

No

OK

No

OK

Push Tractor

OK

No No No

Pull Tractor

No

OK OK

No

Push-pull Tractor Feed

OK

No

No No

2.1.3.1 Paper Advance Mechanisms

This section describes how the friction feed and tractor feed mechanisms work to advance the paper

in the printer.

Friction Feed Method

The paper is held between the platen and paper advance’ roller, and between the paper eject roller and
paper eject unit cover. The paper-feed pinion gear, turning in the direction of the black arrow, drives

the COMBINATION GEAR, 8.5, 30. The COMBINATION GEAR, 8.5, 30 turns the SPUR GEAR, 34,

paper-feed rollers, and top ROLLER

ASSY.,

PAPER EJECT. The paper then advances in the direction of

the white arrow.

The paper advance roller spring holds the paper against the platen. Setting the LEVER, G, ADJUST to
the tractor feed position releases this pressure and frees the paper. Figure 2-4 illustrates friction feed
when paper is inserted through the top entrance.

R

6

40

raper teea
Roller

spuR@’:;A~~~’

Q

COMBINATION GEAR, 8.5, 30

/y

Paper Feed Motor Pinion Gear

MOTOR, PF

Figure 2-4. Top Path Friction Feed

2-3

REV.-B

I

I

Push Tractor Method

When the push tractor is selected, the SPUR GEAR, 16 engages the SPUR GEAR, 17 (Tractor gear) on

the TRACTOR

ASSY.

COMBINATION GEAR, 8.5, 30 is driven by the paper-feed gear, which in turn is

driven by the paper-feed motor pinion gear. The paper-feed pinion gear, when turning in the direction

of the black arrow, results in pushing the paper through the mechanism.

During tractor feeding, the LEVER, G, ADJUST is set to the tractor position to disengage the friction
drive. This releases the pressure between the paper advance roller and the platen. Figure 2-5 illustrates
push tractor operation.

Paper (Continuous)

L

ROLLER ASSY., PAPER EJECT

I

P

/

PLATEN

COMBINATION GEAR, 8:5, 30

I

v

Paper Feed Motor Pinion Gear

MOTOR,

Figure 2-5. Push Tractor Operation

PF

2-4

REV.-B

Pull Tractor Method

Using pull tractor feed to advance the paper is basically the same as using push tractor feed. In push

tractor feed, the TRACTOR

ASSY.

(paper advance mechanism) is before the paper entrance. It pushes

the paper through the PRINTER

MECHANISM.

Puil

tractor

feed, however,

has the opPosite

arran9ementl

with the tractor situated after the paper entrance.

Since it pulls the paper through the PRINTER

MECHANISM, it requires no paper tension unit. Figure 2-6 illustrates pull tractor operation tractor when

paper is inserted through the bottom path.

Paper (Continuous)

/

\

o

TRACTOR ASSY.

PLATEN

;

\/

SPUR GEAR,

16

Gear

COMBlNATK3N

GEAR, 8.5, 30

Figure 2-6. Pull Tractor Operation

Push-Pull Tractor Method

This is a combination of the push tractor and pull tractor methods. TWO tractors are used, one in f
of and one behind the paper entrance, to advance the paper. They act simultaneously to push and
the paper through the PRINTER MECHANISM. Figure 2-7 illustrates push-pull tractor operation.

Paper (Continuous)

PL

7

R, 40

Feed Motor
Gear

T

‘rent

pull

Figure 2-7. Push-Pull Tractor Operation

2-5

I

REV.-B

The LEVER, RELEASE switches between friction feed and tractor feed. Setting the LEVER, RELEASE to
the friction feed position presses the paper advance roller against the PLATEN. Setting the release lever
to the tractor feed position releases this pressure, so that the paper advance roller separates from the
PLATEN. The DETECTOR

ASSY.,

RELEASE senses the current position of the LEVER, RELEASE.

E

R GUIDE

., RELEASE

Paper Feed Roller

Figure 2-8. LEVER, RELEASE Movement

2.1.3.2 Paper Insertion Entrances

This section describes the different ways to feed paper into the printer.

Top entrance paper insertion
When you feed paper into the printer through the top entrance, the method to advance the paper is
friction feed.

There are two paper-out detectors: the front paper-out detector is in front of the PRINTER MECHANISM
and the rear paper-out detector is behind the PRINTER MECHANISM. When paper is inserted through
the top entrance, the rear detector senses when the paper runs out.

Paper (Cut Sheet)

ROLLER ASSY., PAPER EJECT

Printhead

\

\

D

Paper Feed Roller

—

Figure 2-9. Paper Path for Top Entrance Friction

Feed

2-6

REV.-B

Rear entrance paper insertion

When you feed paper into the printer through the rear entrance, the method to advance

be: the push tractor, or the push-pull tractor. The rear paper-out detector senses when
run out.

Paper (Continuous)

\

ROLLER ASSY., PAPER EJECT

Printhead

PAPER GUIDE

TRACTOR

ASSY.

DETECTOR

ASSY.,

Paper Feed Roller

Figure 2-10. Paper Path for Rear Entrance Push Tractor Feed

Paper (Continuous)

\/~–

TRACTOR

ASSY.

Printhead

TRACTOR

ASSY.

DETECTOR

ASSY., PE, REAR

the paper can
the paper has

Paper

F;ed Roller

Figure 2-11. Paper Path for Rear Entrance Push-Pull Tractor

Feed

2-7

REV.-B
Bottom entrance paper insertion

When you feed paper into the printer through the bottom entrance, the pull tractor advances the paper.

The front paper-out detector senses when the paper runs out.

Paper (Continuous)

h

M“?.’?.TRACT”RA’S’”

PF Drive Roller

,.

““’C’”R’’’YPEFR”NTWP

“aper’eea”o”er

/ From Bottom Insertion

Figure 2-12. Paper Path for Bottom Entrance Pull Tractor Feed

2-8

REV.-B

Front entrance paper insertion
When you feed paper into the printer through the front entrance, the paper can be advanced either

with friction feed or the pull tractor. The front paper-out detector senses when the paper runs out.

Printhead

Paper (Cut sheet)

\

DETECTOR

ASSY.,

ROLLER

ASSY.,

PAPER

PF Drive Roller

PE,

FRONT

Paper Feed

From Front Insertion

Figure 2-13. Paper Path

for Front Entrance

DETECTOR

ASSY., PE,

Roller

Friction Feed

Paper (Continuous)

Printhead

TRACTOR

ASSY.

FRONT

From Front Insertion

EJECT

Figure 2-14. Paper Path for Front Entrance Pull Tractor Feed

2-9

REV.-B

2.1.4 Ribbon Advance Mechanism

The ribbon drive gear advances the ribbon through a gear linkage. This arrangement of gears makes
the ribbon drive gear always rotate in a counterclockwise direction, regardless of the direction the
carriage is moving.

Table 2-2. Ribbon Advance Gear Linkage

I

Direction of Carriage

Movement

I

Gear Linkage

Left to right (arrow O ) PULLEY, DRIVEN

@

Ribbon transmission gear ●

COMBINATION GEAR (1) ● COMBINATION GEAR (3)

~

COMBINATION GEAR (4) ● RATCHET, RD

Right to left (arrow Q )

PULLEY, DRIVEN

D Ribbon transmission gear

Q

COMBINATION GEAR

(1) Q

COMBINATION GEAR (2)

~

RATCHET, RD

The ink ribbon within the cartridge case is an endless ribbon that is held against the ribbon advance
roller by the pressure of the ribbon grip roller. The ribbon advance roller, linked to the ribbon drive gear,

winds the ink ribbon.

The ribbon brake spring, attached to the exit slot of the cartridge case, prevents slack in the ribbon
and keeps the ribbon tension correct, The ribbon mask keeps the paper clean by preventing the ribbon

from brushing against the paper.

Ribbon Feed Roller

G

Ribbon Pressure Roller

Ribbon Transmission Gear

W

sPuRGEAR,13.2a5*&;;;E:’

5%LY

COMBINATION GEAR @

RATCHET, RD .

COMBINATION GEAR

@

Figure 2-15.

arriage

Ribbon Advance

2-10

Mechanism

Brake

REV.-B

2.2 POWER SUPPLY OPERATION

The printer can be powered by either of two power supply boards: the 120 V

C062

PSB board or the

220/240 V

C062 PSE

board. The only difference in the way these two boards operate is in the primary
circuitry. How they work to supply power to the printer is identical. These power boards output the DC
current necessary to drive the printer control circuits and printer drive mechanism. Table 2-3 shows
the input voltages and fuse ratings for these boards.

Table 2-3. Power Supply Boards

Board

input Voltage (VAC)

Fuse F1 Rating

C062

PS6

103.5 to 132 2.5A / 125 V

C062

PSE

198 to 264

1.25A / 250 V

2.2.1 Power Supply Overview

The power supply board has two power output lines that supply power to the various control circuits
and drive mechanisms. Table 2-4 lists the parts of the printer that run off these two DC output supply

voltages.

.

Table 2-4. Power Supply Output Voltages and Applications

Output Supply Voltage (DC)

Applications

+35 v MOTOR, CR drive

MOTOR, PF drive
Printhead drive

+5 v

C062 MAIN board logic circuitry

Various sensors
Control panel LEDs
MOTOR, PF hold

2.2.2 Supply Circuit Operation

Figure 2-16 shows the power supply circuitry in block diagram form. AC power feeds into the printer

from the external power source. A filter circuit removes the noise. The AC voltage then undergoes full

wave rectification and is smoothed to produce the direct current supply voltage. This voltage is fed

through a switching circuit and secondary smoothing circuit to produce the stepped down +35

VDC

supply. A +35 V line voltage detector circuit is connected to the switching circuit. This feedback control

arrangement ensures that the +35

VDC supply is kept stabilized.

The + 5

VDC supply is achieved by feeding the

+35 VDC

line through the -t-5 VDC power supply circuit.

This circuit further steps down the +35

VDC voltage and outputs a stabilized +5 VDC supply.

There are two main features of the power supply circuit. First, the power supply switch is in the

secondary circuitry. When this switch is turned off, the switching circuit is de-energized and output of

the +35

VDC

supply stops. However, since the switch is in the secondary circuitry, while the printer

remains plugged into the external AC supply current continues to flow in the primary circuitry, whether
the power supply switch is turned off or on. For this reason, before you perform any maintenance work,
you must disconnect the printer from the external AC power supply by unplugging it from the power
source.

2-11

REV.-A

Second, there are four circuits to protect the supply circuitry and avoid danger. The +5

VDC line

contains a current overload protection circuit and a voltage overload protection circuit. The current
overload protection circuit is part of the + 5

VDC supply circuit. It cuts the + 5 VDC line if the current

is too great. The + 5 V voltage overload protection circuit cuts the supply if the voltage reaches or
exceeds + 7

VDC. It stops the switching circuit operation, which stops the output of the +35 VDC line.

The +35

VDC line has a voltage overload protection circuit and a voltage drop protection circuit. The

+35 V voltage overload protection circuit cuts the supply if the voltage reaches or exceeds +36

VDC.

It stops the switching circuit operation, which stops the output of the +35

VDC line. The voltage drop

protection circuit protects the printer from such damage as might occur from short circuiting in the
secondary circuitry of the +35

VDC line. If a voltage drop is detected, it stops the switching circuit

operation, which stops the output of the +35

VDC line.

Power Supply Board

~

---------------------------- -------------------- -------------------- --

-:

1

1

I

,

1

1

I

Prima ry

~

Secondary

1

b

supply

I

Circuit

+

+5

VDC

1

1

IH.m.m+m

;

,

1
1
1
1

t

1

1

1
1
1

1
I

1

1

1

r

Filter
Circuit

t

I

I

I

I
1
1
1
1
1

1

1
1
1

I
I

I

-------

-------------------------

I

t

AC

Input

t!

1
1
1
1

1

1

*

1

1
1

I

I

1

I

I

1

1

I

1

1

I

1

I

1

1

1
1

+35 line

1

Voltage

1

Drop

1
1

Protection

I

Circuit
1
1

1
1
1
1
1
1

+

VDC

1
1
I
1
1

1
1
1
1
1

1

1

I
1

I

1

1

1

1

-

Power

1

1

t

Switch

1

-----------------------------------

----

J

Figure 2-16. Power Supply Circuit Block Diagram

2-12

REV.-B

2.3 CONTROL CIRCUIT OPERATION

The control circuit consists of two boards: the

C062

MAIN board, which acts as the main board, and

the

C062

PNL board, which acts as the control panel board. This section describes how these boards

work.

2.3.1

Control Circuit Operation Overview

The printer CPU is an 8-bit CPU TMP90C041 running at 10 MHz. It oversees control of all the
components of the printer. The

E05A50

gate array contains various memory management functions

that control the assignment of the memory and

1/0

areas. Rationalization and simplification of the

circuitry is achieved through use of the

STK-6022B,

which holds all the driver circuits for driving the

PRINTER MECHANISM on a single chip. Figure 2-17 shows the control circuits in block diagram form. I

C062 PNL

Board

~

-------

-{

I

Control

I

{

Panel

:

1
1

‘1

1------

--

J

C062 MAIN Board

~ ---------- ----------------------------- -------------------------

-----------.

1
1
1
1

8
8
I

t
I

I
1
,

1
1

I

I

I

1

1

GA “

Parallel
l/F

E05A50

(4D)

~

d

~

--------,

I

Option

1

:

l/F

:

I--------

J

1
1
1
1
1
1

1

1

1

1

1
1

I

t

1
1

1
1

--

❑

Vref

Circuit

---------.

,---

—

EEPROM

(4C)

I

1

PROM
5 12K

(5 E)

-----------

I

7

I X

136 column

[

~

only

1

t

I

1
I
I

1

1
1
1
1

1

9

I

1

I

1

1

PSRAM.

;

PSRAM:

MROM MROM :

256K

:

64K

;

8M

1

(6E)

,

( 1 E)

; (3E)

~?E)

;

!

1

I

t

1

1

L-----

.----d

!

1
1
1
1
1
1

1

CPU TMP90C041 (lC)

1

I

.

----------------------

--------

STK-6022B (2A)

,----

------------------

--------

1
1

1

1

1

I

I

I

~-----

-------------------------------------------

-------------------------------,

I

1

I

I

I I I

I

1

:

PRINTHEAD MOTOR, CR MOTOR,

P.F

DETECTOR AS

SY.,DETECTOR ASSY.,

DETECTOR

ASSY.,

DETECTOR

ASSY.,

DETECTOR

ASSY.

j

I

I

HP

PE, FRONT

PE, REAR

PLATEN

RELEASE I

1 ---------------------------- ------------------------- ---------------------- ----

-1

PRINTER MECHANISM

GA

Gate array

DETECTOR

ASSY.,

HP Home position sensor

DETECTOR

ASSY.,

RELEASE Platen gap sensor

MOTOR, CR

Carriage motor

DETECTOR

ASSY.,

RELEASE Release sensor

MOTOR, PF

Paper advance motor

DETECTOR

ASSY.,

PE, FRONT Front paper-out detector (positioned in front of the PRINTER MECHANISM)

DETECTOR

ASSY.,

PE, REAR Rear paper-out detector (positioned behind the PRINTER MECHANISM)

Figure 2-17. Control Circuit Block Diagram

2-13

I

REV.-B

Table 2-5 lists the functions of the main components and circuits of the printer. The CPU converts the
print data sent from the host computer to image data (the print image). The image data is then loaded

to RAM. Each line of data is processed sequentially. The CPU transfers the print data to the

printhead

drive circuit. The CPU sends the

printhead drive pulse to the

printhead

drive circuit. The length of this

pulse corresponds to the

printhead drive voltage. The head drive circuit then

signal.

~

Print

Host

Data

Computer

r

+35V

Line

t-

CPU

RAM

-w

Print Data

t*

---------

Convertor

II

#l

Printhead

Drive

Pulse

STK-6022B

-1-

Data Latch

and

Data Output

~ Printhead

Figure 2-18. Data Flow

Table 2-5. Functions of the Main

IC

and Circuits

outputs the head drive

IC or Circuit Location

Functions

TMP90C041

Ic

Receives data from the host computer and loads the data to the input
buffer in

RAM

(under interrupt processing control). Expands the input data
held in the buffer to create image data. Loads this image data to the
image buffer in RAM. Transfers the image data to the

printhead

drive

circuit. Also controls various parts of the PRINTER MECHANISM, such as

the motors.

E05A50 4D This is a gate array consisting of three components configured on a

single chip:

Memory Management Unit

Handles CPU memory in ROM, RAM, and mask ROM, and assigns
addresses for other devices.

Parallel Interface (Parallel I/F)

Holds the parallel interface functions.

Reset Circuit

Contains the circuit that generates the RESET signal.

2-14

REV.-B

Table 2-5. Functions of the Main IC and Circuits (Cont.)

IC

or Circuit

Location

Functions

STK-6022B

2A

This is a single chip that houses drive circuits for the printhead,

MOTOR,CR

and MOTOR, PF of the PRINTER MECHANISM. The chip also includes the
various sensor input circuits for the PRINTER MECHANISM.

PROM

5E

PROM contains the program that runs the CPU.

RAM

6E

Holds the CPU working area and the various buffers. (1 E is not used for

IE

an 80-column device and is not installed.)

MROM

3E

Holds the character design (also called the character generator).

(Mask ROM)

4E

EEPROM

4C

EEPROM

is an electronically writable and erasable ROM used to hold such

information as the TOF position.

Vref Circuit —

This is a circuit for generating the reference voltage used in the A/D
convertor within the CPU.

2.3.2 Reset Circuit

Figure 2-19 shows the reset circuit in block diagram form. The reset circuit issues the RESET signal.

Each part of the control circuits is initialized when this

RESETsignai is received. The conditions when

the RESET signal is output are described below.

When turning on the power supply

Immediately after the power has been turned on,

STK-6022B

(2A) outputs the VCCON pulse.

E05A50
(4D) receives this pulse and then outputs the DISC pulse. The electrical charge in the condenser within

the

STK-6022B

is then discharged. After this, STK-6022”B outputs the THLD signal, and

E05A50

then
outputs the RESET signal. After a certain time has elapsed, the charge in the condenser in the

STK-6022B

builds up again. The THLD signal is canceled and then the RESET signal is canceled.

Resets performed by the CPU itself (CPU self-reset)

The CPU outputs the RESET signal if there is a RESET request for

E05A50

and if

E05A50

has output

the DISC pulse.

+5

v.

STK-6022B

Line

E05A50

(2A)

4

(4D)

-----------

-----------

75

107

vmm

mm

73 106 —

THLD THLD

—

72

DISC

’

05

m

WsET

Figure 2-19. Reset Circuit Block Diagram

2-15

REV.-A

Power On

CPU Self Reset

I

i

+5 V Line

-

Vmml

Figure 2-20. RESET Signal Timing

2.3.3 Sensor Circuits

Figure 2-21 shows the sensor circuits in block diagram form. Detection of any excessive printhead

temperature causes the TEMP2 signal to be sent directly to the CPU. Other signals, such as the

CRHOME

signal, pass through the

STK-6022B

unit before reaching the CPU. Terminals

P50

to

P55

on the CPU

are used for the A/D convertor.

The

Vref

circuit generates the A\D convertor reference voltage

Vref.

CPU (1 c)

STK-6022B

(2A)

P55

CRHOUT

~

CRHOME

CRHOME

P54 PE20UT

~

PE2

‘

PE2

P52

B

PE1OUT

~

PE 1

E

PE1

P34

GAPOUT

~

GAP

GAP

P31

LEVOUT

~

LEVER LEVER

P51 —“

AVPP

~

VPP +35 V Line

I

‘50~TEMp2

4.741 v

Vref

‘

Vref

Circuit

Figure 2-21, Sensor Circuit Block Diagram

2-16

REV.-B

2.3.4 MOTOR, CR Drive Circuit

Figure 2-22 shows the MOTOR, CR drive circuit. An open-loop, constant-current drive arrangement is
used for running the MOTOR, CR. The motor is driven by 2-2 phase excitation and 1-2 phase excitation.
2-2 phase excitation corresponds to two 1-2 phase excitation steps. Thus, for each single step phase

change of a

2-2 phase excitation motor, the carriage moves 1/1 20 inch. For each single step phase

change of a 1-2 phase excitation motor, the carriage moves 1/240 inch.

The MOTOR, CR drive circuit of the

STK-6022B

detects the amount of current flowing in the MOTOR,

CR coil and regulates this current. The current flowing through the coil varies, depending on the speed

of the MOTOR, CR. The amount of current is set by the CPU via the

E05A50 1/0

port. Signals are sent

to

SELR

1 to SELR4 on the

STK-6022B.

The

STK-6022B

sets the coil current to correspond to the

MOTOR, CR speed.

Ports

P60

to

P63

on the CPU are used exclusively as control ports

CPU (lC)

P60

P61

P62

-

P63

STK-6022B (2A)

CRAIN

CRA

CRBIN

CRB

CRCIN

CRC

m

CRD

Po

SELR1

Data

Bus

P1

SELR2

P2

SELR3

Gp

P5

SELR4

E05A50(4D)

for the stepping motor.

-

Coil Current

MOTOR, CR

1

i

Coil Current

GND

Figure 2-22. MOTOR, CR Drive Circuit

Table 2.6. MOTOR, CR Drive Modes

I

Drive Mode Excitation Tvoe

-

Drive Frequency Type

Standard Print Character

3.214 X speed
3 X speed
2 X speed

1.5

X speed

4/3 X speed

1 X speed

2/3 X speed

1/2 X

sDeed

2-2 phase
2-2 phase
2-2 phase

1-2 phase

1-2 phase

1-2 phase

1-2 phase

1-2 phase

2700 PPS
2520 PPS

1680

pps

2520 pf)S
2240 PPS

1680

pps

1120

pps

840 PPS

High Speed Draft
Draft

LQ

I

I

I

2-17

I

I

I

REV.-B

2.3.5 MOTOR, PF Drive Circuit
The printer uses a stepping motor to advance the paper. The minimum amount of paper that can be

advanced is 1/360 inch. The motor is a 2-2 phase or 1-2 phase, constant-voltage drive type.

P70

to

P73

on the CPU are the control ports for the stepping motor. MOTOR, PF phase data is output through

these ports.

PFA

to

PFD

are turned on and off within the

STK-6022B

according to this phase data sent

from the CPU.

When the MOTOR, PF is running, the voltage supplying the coil of the MOTOR, PF is +35 V. When the
MOTOR, PF is not running and is in hold status, the supply voltage to the coil is + 5 V. Switching between

these two supply voltages occurs at the

PFCOM terminal of the

STK-6022B

when PFENB is turned on

or off.

STK-6022B (2A)

CPU

(Ic)

P70

PFAIN

PFA

[

k

MOTOR, PF

P71

PFBIN

PFB

P72

PFCIN PFC

P73

PFDIN PFD

,

,,,,,!

p31-,Fmm

pFcoM~+35vor+5v

E05A50 (4D)

Figure 2-23.

MOTOR, PF Drive Circuit

2-18

REV.-A

2.3.6

Printhead

Drive Circuit

Figure 2-24 shows the printhead drive circuit in block diagram form. The print data already has been
expanded to create the image data. The CPU splits up this data three times and transfers this information
to the latch circuit within the

STK-6022B.

The CPU samples the voltage of the +35 V line via the A/D

convertor (see Section 2.3.3).

The CPU outputs a pulse via the CPU time output port

P83.

The length of this pulse corresponds to

the voltage of the +35 V line. This pulse becomes the head drive signal. In this way,

STK-6022B

outputs

head drive signals (signals HD 1 to

HD24)

that relate to voltage levels through the length of the pulses.

These signals are output to the head for each of the sections of print data that were created by

subdividing the data three times before sending.

By sampling the +35 V line voltage and determining the length of the head drive signal, it is possible
to maintain the energy supplied to the head at a constant level. If the voltage of the +35 V line is HIGH,
the CPU shortens the output pulse. If the voltage of the +35 V line is LOW, the CPU lengthens the output

pulse.

Figure 2-25 shows the timing of-the output of the head drive signal.

CPU (Ic)

DO-7

P83

1

.

I

E05A50 (4D)

STK-6022B

(2A)

DO-7

HD 1-24

L

~

Printhead

Figure 2-24.

Printhead

Drive Circuit

CPU

P83

Output

‘A’O

~

HD1-24

r

----------

1

l-----------—~

1

t

1

I

L ---------- J

L ------ .----J

Figure 2-25. Head Drive Signal Output Timing

2-19

REV.-A

2.3.6

Printhead

Drive Circuit

Figure 2-24 shows the

printhead drive circuit in block diagram form. The print data already has been

expanded to create the image data. The CPU splits up this data three times and transfers this information
to the latch circuit within the

STK-6022B.

The CPU samples the voltage of the +35 V line via the A/D

convertor (see Section 2.3.3).

The CPU outputs a pulse via the CPU time output port

P83.

The length of this pulse corresponds to

the voltage of the +35 V line. This pulse becomes the head drive signal. In this way,

STK-6022B

outputs

head drive signals (signals HD 1 to HD24) that relate to voltage levels through the length of the pulses.

These signals are output to the head for each of the sections of print data that were created by

subdividing the data three times before sending.

By sampling the +35 V line voltage and determining the length of the head drive signal, it is possible
to maintain the energy supplied to the head at a constant level. If the voltage of the +35 V line is HIGH,
the CPU shortens the output pulse. If the voltage of the +35 V line is LOW, the CPU lengthens the output
pulse.

Figure 2-25 shows the timing of the output of the head drive signal.

CPU

(lC)

DO-7

P83

E05A50

(4D)

Figure 2-24.

Printhead

STK-6022B

(2A)

DO-7

HOI-24

PTO

Drive Circuit

Printhead

CPU

I

I

I

P83 Output
E05A50

I

HD1-24

,

----------

1

r -----------z

1

t

1

1

L ----------J

L -----------A

Figure 2-25. Head Drive Signal Output Timing

2-19

REV.-B

CHAPTER 3

DISASSEMBLY AND ASSEMBLY

3.1 OVERVIEW

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-1

3.1.1 Precautions for Disassembling the Printer . . . . . . . . . . . . . . . . . . . . . . 3-1

3.1.2

Took

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-1

3.1.3 Service Checks After Repair

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-2

3.1.4 Specifications for Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

.

3-3

3.2 DISASSEMBLY AND ASSEMBLY

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4

3.2.1 Changing the Printhead

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-5

3.2.2 Removing the Printer Case

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-6

3.2.2.1 Removing the Front Case. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6

3.2.2.2 Removing the HOUSING ASSY., UPPER ............ 3-6

3.2.3 Removing the Circuit Boards

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-7

3.2.3.1 ‘Removing the BOARD

ASSY., MAIN

(C062

MAIN Board)

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-7

3.2.3.2 Removing the BOARD

ASSY., POWER SUPPLY

(C062

PSB/PSE Board)

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-8

3.2.3.3 Removing the BOARD ASSY.,PANEL

(C062

PNL Board)

‘

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-8

3.2.4 Removing the PRINTER MECHANISM

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-9

3.2.5 Disassembling the PRINTER MECHANISM . . . . . . . . . . . . . . . . . . . . . 3-10

3.2.5.1

3.2.5.2

3.2.5.3

3.2.5.4

3.2.5.5

3.2.5.6

3.2.5.7

3.2.5.8

3.2.5.9

3.2.5.10

3.2.5.11

3.2.5.12

3.2.5.13

Removing the Motor, CR

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-10

Removing the Motor, PF

. . . . . . . . . . . . . . . . . . . . .

.

. . . . . . . . . . . . . . . . . . . . .

3-11
Removing the CABLE, HEAD, FRONT(,REAR)... 3-11
Removing the Carriage

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-12
Removing the PLATEN

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-13
Removing

~nd

Disassembling

the FLAME, MAIN, RIGHT

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-14
Removing and Disassembling the PAPER GUIDE
Assembly (Including the DETECTOR

ASSY., RE-

LEASE)

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-15

Removing

th~

DETECTOR

ASSY.,

HP... . . . . . . . . . . . . . . . 3-17

Removing the DETECTOR ASSY.,

PE,

REAR .... 3-17

Removing the DETECTOR

ASSY.,

PE,

FRONT.. 3-18

Removing the DETECTOR

ASSY., PLATEN ....... 3-18

Disassembling the TRACTOR ASHY. . . . . . . . . . . . . . . . . . 3-19

Arranging the Cables

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-20

s-i

REV.-B

Figure 3-1.

Figure 3-2.

Figure 3-3.
Figure 3-4.

Figure 3-5.

Figure

3-6.

Figure 3-7.
Figure 3-8.
Figure 3-9.
Figure 3-10.

Figure 3-11.
Figure 3-12.
Figure 3-13.
Figure 3-14.
Figure 3-15.
Figure 3-16.

Figure 3-17.
Figure 3-18.
Figure 3-19.
Figure 3-20.
Figure 3-21.
Figure 3-22.
Figure 3-23.
Figure 3-24.
Figure 3-25.

Figure 3-26.
Figure 3-27.

Figure 3-28.

Table 3-1.
Table 3-2.
Table 3-3.
Table 3.4.
Table 3-5.

LIST

Flowchart for

OF FIGURES

Disassembling the Printer . . . . . . . . . . . . . . . . . . . . . . 3-4

Removing the Printer Cover and

the Paper Eject Cover

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-5

Removing the Printhead

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-5

Removing the HOUSING, FRONT

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-6
Removing the Cover for the Optional
Interface Card

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

.

3-6
Removing the
Removing the
Removing the
Removing the
Removing the

Removing the
Removing the

SHIELD PLATE, MAIN BOARD ............ 3-7

BOARD

ASSY.,

MAIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7

BOARD

ASSY.,

POWER SUPPLY . . . . . . . . 3-8

BOARD ASSY., PANEL

. . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-9

PRINTER MECHANISM

. . . . . . . . . . . . . . . . . . . . . . . . . . .

3-9

MOTOR, CR

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-10

MOTOR, PA............. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

.

3-11

Removing the CABLE, HEAD,

FRONT(,REAR)...

. . . . . . . . . . . 3-11

Removing the Carriage Unit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

.

3-12

Removing the PLATEN

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

.

. . . . . . . . . . .

.

3-13

LEVER, RELEASE Insertion Positioning . . . . . . . . . . . . . . . . . . . . . . . . . 3-14

Disassembling the FRAME, MAIN, RIGHT . . . . . . . . . . . . . . . . . . . . 3-14

Direction for Inserting the PLAIN WASHER . . . . . . . . . . . . . . . . 3-15

Removing the PAPER GUIDE

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-15
Removing the PAPER GUIDE

ASSY., SUPPORT . . . . . . . . 3-16

Removing the LEVER

ASSY.,

PF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-16

How to Insert the SHAFT, RELEASE

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-16

Removing the

DERECTOR ASSY., HP

. . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-17

Removing the

DERECTOR ASSY., PE,

REAR. . . . . . . . . . . . . . . 3-18

Removing the

DERECTOR ASSY.,

PE, FRONT . . . . . . . . . . . . 3-18

Removing the

DERECTOR ASSY.,

PLATEN . . . . . . . . . . . . . . . . . . 3-19

Disassembling the TRACTOR

ASSY

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-19

Arranging the Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

.

3-20

LIST OF TABLES

List of Recommended Tools

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-1

Equipment Required for Maintenance

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-1

Inspection Checklist for Repaired Printer . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

Abbreviations Used for Screws

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-3

Types of Screws and Abbreviations

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

.

3-3

S.ii

REV.-A

3.1 OVERVIEW

This section describes the various points to note when disassembling and assembling the printer.

3.1.1 Precautions for Disassembling the Printer

Follow the precautions below when disassembling the printer.

WARNING

Before disassembling, assembling, or adjusting the printer, disconnect the power supply cable from
the external AC power socket. Failure to do so risks personal injury. The power supply switch for
the printer is wired into the secondary circuitry. As a result, the printer still remains live with current
flowing even

when this switch is off.

CAUTION

To maintain efficient printer operation, use only the recommended tools for maintenance work.

Use only the recommended lubricants and adhesives (see Chapter 6).

Adjust the printer only in the manner described in this manual.

3.1.2

TOOIS

Tables 3-1 and 3-2 list the various recommended tools that are needed when disassembling,
assembling, or adjusting the printer. Use only tools that meet these specifications.

Table 3-1. List of Recommended Tools

Tool

Part No.

Round-nose pliers

B740400 100

Nippers B7405OO1OO

Tweezers

6741000100

Soldering iron

B740200 100

E-ring holder # 2.5

B740800400

E-ring holder # 5

B740800700

E-ring holder # 6

B740800800

Phillips screwdriver No. 2

6743800200

Normal screwdriver

6743000100

Box driver (7 mm

across)

B74 1700200

Thickness gauge (0.44

mm)

—

Thickness gauge (0.47 mm)

—

NOTE

All tools are commercially aveilable.

Table 3-2. Equipment Required for Maintenance

3-1

REV.-A

3.1.3 Service Checks After Repair

When printer components are to be sent back to the customer after servicing, first use the checklist
shown in Table 3-3 to note the current state of the components. This checklist provides a record to
make servicing and shipping more efficient.

Table 3-3. Inspection Checklist for Repaired Printer

Category

Component

Item to Check

Is Check Required?

Printer

Printhead

•l

Are any wires broken?

❑ Checked, Not necessary

features

Are any wires worn out?

•lChecked, ❑ Not necessary

Carriage

Does the carriage move smoothly?

•l❑ Checked, Not necessary

mechanism

El

Movement noisy, ❑ Mechanism dirty,

❑

Mechanism oily

•l

Is the carriage motor running at the correct

Checked, •! Not necessary

temperature and not overheating?

•lChecked, ❑ Not necessary

Paper

Is the paper advancing smoothly?

•lChecked, •! Not necessary

advance

❑

Movement noisy, ❑ Mechanism dirty,

mechanism

❑

Mechanism oily

Is the paper advance motor running at the

•l❑ Checked, Not necessary

correct temperature and not overheating?

Paper path

•l

Is the type of paper in the printer feeding

❑ Checked, Not necessary

smoothly?

•l

Is the tractor feeding the paper correctly?

❑ Checked, Not necessary

Is the paper path clear of all obstructions?

•lChecked, ❑ Not necessary

Is the platen free of damage?

•lChecked, ❑ Not necessary

Ribbon

Is the ribbon mask free of distortion?

•lChecked, ❑ Not necessary

mask
Self-print

•l

Was the self-print test successful?

Checked, •l Not necessary

test
On-line test

Was the on-line test successful?

El

Checked, ❑ Not necessary

\djustment

Printhead

Is the platen gap adjusted correctly?

❑ Checked, ❑ Not necessary

Printing

•l

Is the bidirectional print position adjusted

Checked, ❑ Not necessary

correctly?

DIP switch

Have DIP switches been reset to their

facto-

❑ Checked, ❑ Not necessary

settings

ry shipment settings?

;ystem

ROM

•l

The ROM version is XXX.

El

Checked, Not necessary

Ipgrade

version

;hipment

•!

Has the ribbon been removed?

Checked,

❑ Not necessary

Have all relevant parts been included in the

❑ Checked, ❑ Not necessary

shipment?

REV.-A

3.1.4 Specifications for Screws
In the following sections, abbreviations are used for small parts, such as screws and washers. Tables

3-4 and 3-5 list these abbreviations.

Table 3-4. Abbreviations Used for Screws

Abbreviation

Part Neme

CBS(C)

Cross-recessed Bind head Cone point S tight screw

CBB(C)

Cross-recessed Bind head Cone point B tight screw

CB

Cross-recessed Bind head screw

CBS(0)

Cross-recessed Bind head S tight with screw with Outside toothed

lock washer

Table 3-5. Types of Screws and Abbreviations

Heed

Top

.~ross–recessed heal

@

!.~lotted

head

e

—

Side

.

.Bind

0=
0=

(with

Notch)

.~russ

(lb

.

Body

.~ormai

!. ~-tight

3.

E&tight

,, ,, ; i, ,

i,

mo

..~apping

Washer

(assembled)

1.~lain washer

2.@tside toothed

lock washer

3.~pring washer

3-3

REV.-A

3.2 DISASSEMBLY AND ASSEMBLY

This section describes the procedures for disassembling and assembling the main components

of the
printer. When the procedure for installing a component into the printer is simply the reverse of the
procedure for removing the component, no description of how to install the component is given.

Any points of special concern when assembling or adjusting a component part are given after the
description of the procedure. It is important to take note of these points.

CAUTION

Before disassembling any part of the printer, note the warnings in Section 3.1.
Before disassembling any part of the printer, remove the paper and the ink ribbon.

Disassembly

1. Removing

2. Removing

3. Removing

4. Removing

includes the following five procedures:

the
the
the

the

printhead

case
electrical circuits
printer mechanism

5. Disassembling the printer mechanism

Diagrams in the appendix show how the components fit together. Refer to them as necessary.

I

Remove printer power cord
and interface cable.
Remove paper.

Section

Page

Description

Remove ribbon cartridge.

3.2.2.1 3-6 3.2.1

3.2.5.12 3-19

Removing the Front Case Changing the

Printhead Disassembling the Tractor Unit

3.2.2.2

3-6

3.2.3.3

\

3-8

Removing the Upper Case

Removing the Control Panel Board

3.2.4

3-9 3.2.3.1

3-7 3.2.3.2

Removing the Printer Mechanism

Removing the Main Board

Removing the Power Supply Board

3.2.5

I

3-10

Disassembling the Printer Mechanism

Figure 3-1. Flowchart for Disassembling the Printer

3-4

REV.-B

3.2.1 Changing the Printhead

1.

Remove the FRAME ASSY., SHEET GUIDE.

2. Remove the COVER

ASSY., EJECT.

HEET GUIDE

ASSY.,

EJECT

“(This illustration shows the

LQ-570,

an 80-column printer. The difference

between the

LQ-570

and the LQ-

1070 is only in carriage width.)

Figure 3-2. Removing the FRAME ASSY., SHEET GUIDE and the COVER ASSY., EJECT

3. Release the two levers that hold the

printhead

to the carriage. Lift out the

printhead.

4. Remove the two FFCS (CABLE, HEAD,

FRONT(,REAR))

from the

printhead.

CAB1

Figure 3-3. Removing the Printhead

3-5

REV.-B

3.2.2 Removing the Printer Case
This section describes how to remove the front case and HOUSING ASSY., UPPER.

3.2.2.1 Removing the

HOUING, FRONT

1. Remove the COVER

ASSY., PRINTER, FRONT.

2. Remove the HOUSING, FRONT.

3. Use a screwdriver to release the clips that hold the front case to the HOUSING

ASSY., UPPER. Open

the HOUSING, FRONT. Remove connector

CN

1 on the BOARD ASSY., PANEL (C062 PNL). Remove

the HOUSING, FRONT.

picture

printer)

I

Figure 3-4. Removing the HOUSING, FRONT

shows an 80-

1

3.2.2.2 Removing the HOUSING ASSY., UPPER

1.

2.

3.

4.

5.

Remove the COVER ASSY., PRINTER, FRONT, the COVER ASSY., EJECT, the TRACTOR ASSY, and

the KNOB.

Remove the two CBS(C)

(M3 X 10) screws that hold the optional interface card cover. Remove the

cover.

CB8(C) ‘M4XX) ‘crew2

CBS(C) (M3X 10)

Screws

COVER, CONNECTOR, UPPER
for Optional Interface Card

(*This picture is 80-column)

Figure 3-5. Removing the COVER, CONNECTOR, UPPER for the Optional Interface Card

Remove the HOUSING, FRONT (see Section 3.2.2. 1).
Remove the two

CBB(C)

(M4 X 25) screws that hold the HOUSING ASSY., UPPER to the HOUSING

ASSY., LOWER.

Depress the two clips that hold the HOUSING

ASSY., UPPER to the FRAME ASSY., SHEET GUIDE.

Remove the HOUSING

ASSY., UPPER.

3-6

REV.-B

3.2.3 Removing the Circuit Boards

This section describes how to remove the BOARD

ASSY.,

MAIN

(C062

MAIN board), the BOARD

ASSY.,

POWER SUPPLY

(C062

PSB/PSE board) and the BOARD

ASSY.,

PANEL

(C062

PNL board).

3.2.3.1 Removing the BOARD

ASSY.,

MAIN

(C062

MAIN

Board)

1.

2.

3.

4.

5.

6.

7.

Remove the HOUSING ASSY.,UPPER (see Section 3.2.2.2).
Remove the

CB

(M3 X 6) screws that hold the HOLDING PLATE,

FFC

to the SHIELD PLATE, MAIN

BOARD . Remove the HOLDING PLATE,

FFC.

Disconnect the

FFC

(CABLE, HEAD, FRONT (, REAR)) removing the cables for the CN6 and CN7
connectors on the main board.
Remove the three

CBB

(C)

(M3

X 10) screws that hold the SHIELD PLATE, MAIN BOARD to the BOARD

ASSY., MAIN. Remove the SHIELD PLATE, MAIN BOARD.

CB8(C)

(M4

X 14) Screw

SHIELD PLATE, RIGHT

CBB

(M4 X 10)

Screv

CB (M3 X 6) Screw

HOLDING PLATE,

FFC

SHIELD PLATE,
MAIN BOARD

BOARD

ASSY.,

‘MAIN

CBB(CfiM3

X 10) Screws

(C062

MAIN Board)

Figure 3-6. Removing the SHIELD PLATE, MAIN BOARD

Remove the

CBB

(M4X 10) screw that holds the SHIELD PLATE, RIGHT to the BOARD ASSY., MAIN.

Remove the

CBB(C) (M4

X 14) screw that holds it to the HOUSING

ASSY.,

LOWER. Remove the SHIELD
PLATE, RIGHT.
Remove the cables for the following BOARD ASSY., MAIN connectors:

CN3

(brown 12-pin), CN4

(white 5-pin), CN5 (white 6-pin), CN8 (yellow 2-pin),

CN9

(black 2-pin), CN 10 (blue 2-pin), CN 11 (white
2-pin), and CN 12 (red 2-pin).
Remove the three

CBB(C) (M3

X 10) screws and CB

(M3

X 8) screws that hold the BOARD

ASSY.,

MAIN

to the HOUSING ASSY., LOWER. Remove the BOARD ASSY., MAIN.

.

CBB(C)

(M3 X 10) Screws

I

CB (M3 X 8)’ Screw

BOARD

ASSY.,

MAIN

Figure 3-7. Removing the BOARD ASSY., MAIN

3-7

REV.-B

I

Point to Note for Assembly and Adjustment

After replacing the BOARD

ASSY.,

MAIN, you must adjust the bidirectional print position

again to ensure bidirectional printing is correctly aligned (see Section 4.2).

3.2.3.2 Removing the BOARD

ASSY., POWER SUPPLY

(C062

PSB/PSE Board)

1. Remove the HOUSING

ASSY., UPPER (see Section 3.2.2.2).

2. Remove the cable for connector CN 13 from the BOARD

ASSY., MAIN,

3. Remove the cable for connector

CN

1 from the BOARD ASSY., POWER SUPPLY.

4. Remove the four

CBB(C) (M3X

10) screws and the CB

(M3X8)

screws that hold the BOARD ASSY.,

POWER SUPPLY to the HOUSING

ASSY., LOWER. Remove the BOARD ASSY., POWER SUPPLY.

BOARD

ASSY.,

POWER SUPPLY

(C062 PSB/PSE

Board)

GROUNDING WIRE

(* 136-column only)

(80-column)

(1 36-column)

Figure 3-8. Removing the BOARD ASSY., POWER SUPPLY

I

3.2.3.3 Removing the BOARD ASSY., PANEL

(C062

PNL Board)

1. Remove the HOUSING, FRONT (see Section 3.2.2.1).

2. Remove the 10

CBB(C)(M3X 10) screws that hold the BOARD ASSY.,PANELto the HOUSING, FRONT.

Remove the BOARD

ASSY., PANEL.

, PANEL
ard)

HOUSING,

FRONT

Figure 3-9. Removing the BOARD ASSY., PANEL

3-8

REV.-B

3.2.4 Removing the PRINTER MECHANISM

1. Remove the HOUSING

ASSY., UPPER (see Section 3.2.2.2).

2. Remove the CB (M3X 6) screws that attach the HOLDING PLATE., FFC to the SHIELD PLATE, MAIN
BOARD. Remove the HOLDING

PLATE,FFC.

3. Disconnect the 2

FFCS(CABLE,

HEAD, FRONT(,REAR))from the

CN6

and

CN7

connectors on the

BORAD

ASSY., MAIN. Remove the cables for the following BOARD ASSY., MAIN connectors:

CN3

(brown 12-pin),

CN4

(white 5-pin),

CN5

(white 6-pin),

CN8

(yellow 2-pin),

CN9

(black 2-pin), CN1O

(blue 2-pin), CN 11 (white 2-pin) and CN12 (red 2-pin).

4. Remove the

CBB(C)

(M4

X 10) screw that holds the SHIELD PLATE., RIGHT to the BOARD

ASSY.,

MAIN

(see Figure 3-6). Remove the

CBB(C)

(M4X

14) screws that hold it to the HOUSING

ASSY.,

LOWER.

Remove the SHIELD PLATE., RIGHT.

5. Remove the three

CBB(C) (M4X

14) screws that hold the PRINTER MECHANISM to the HOUSING

ASSY., LOWER. Remove the PRINTER MECHANISM.

II

d-l.

-

—-

&

—

SHIELD PLATE, RIGHT

CBB(C)

(M4 X 14) Screws

CBB(C)

(M4 X 14) Screws

(’This picture is 80-column.)

Figure 3-10. Removing the PRINTER MECHANISM

Point to Note for. Assembly and Adjustment

After replacing the PRINTER MECHANISM, you must adjust the bidirectional print position to ensure

I

bidirectional printing is correctly aligned (see Section 4.2).

3-9

I

REV.-B

3.2.5 Disassembling the PRINTER MECHANISM

This section describes how to disassemble the main components of the PRINTER MECHANISM.

3.2.5.1 Removing the MOTOR, CR

1. Remove the PRINTER MECHANISM from the HOUSING

ASSY., LOWER (see Section 3.2.4).

2. Remove the printer spring (778 gm) from the base frame and the MOTOR, CR frame.

3. Remove the TIMING BELT from the BELT PULLEY.

4. Remove the MOTOR, CR frame from the HOUSING

ASSY., LOWER.

5. Remove the two CBS(0)

(M3X6)

screws that hold the MOTOR, CR to the FRAME ASSY., CR, MOTOR.

Remove

the

MOTOR, CR .

MOTOR, CR

EXTENSION SPRING, 778

FRAME, MAIN, BASE

FRAME ASSY., CR,

ifl~a

MOTOR

6) Screws

Figure 3-11. Removing the MOTOR, CR

Points to Note for Assembly and Adjustment

See Section 3.2.5.13 for details on arranging and positioning the motor cable.

After removing the MOTOR, CR from the FRAME

ASSY., CR, MOTOR, you must adjust the MOTOR,

CR backlash (see Section 4.1. 1). You also must adjust the bidirectional print position to ensure
bidirectional printing is correctly aligned (see Section 4.2).

3-1o

REV.-B

3.2.5.2 Removing the MOTOR, PF

1. Remove the PRINTER MECHANISM from the HOUSING

ASSY.,

LOWER(see Section 3.2.4).

2. Remove the COMPRESSION SPRING, 200 that holds the platen shaft.

3. Release the two clips holding the MOTOR,

PF

to the FRAME, MAIN, RIGHT.

4. Remove the MOTOR,

PF

from the FRAME, MAIN, RIGHT.

FRAME, MAIN, RIGHT

.

MOTO’R, PF

Figure 3-12. Removing the MOTOR,

PF

Point to Note for Assembly

See Section 3.2.5.13 for details on arranging and positioning the motor cable.

3.2.5.3 Removing the

FFC

(CABLE, HEAD, FRONT(,REAR))

1.

2.

3.

4.

5.

Remove the printhead (see Section 3.2. 1).
Remove the PRINTER MECHANISM from the HOUSING

ASSY., LOWER (see Section 3.2.4).

Remove the

FFC

from the clips that hold it along the rear side of the PRINTER MECHANISM. Make

sure that the

FFC

is free.

Remove the

FFC

from clip on the HOLDING PLATE,

FFC

at the rear of the PRINTER MECHANISM.

Remove the four clips that hold the HOLDING PLATE,

FFC

to the base frame. Remove the

FFC

together

with the HOLDING PLATE,

FFC.

.

.

L(

CABLE, HEAD, FRONT

CABLE, HEAD, REAR

I

Figure 3-13. Removing the

FFC

Cable

Point to Note for Assembly

See Section 3.2.5.13 for details on arranging and positioning the

FFC.

3-11

REV.-B

3.2.5.4 Removing the Carriage

1.

2.

3.

4.

Remove the FFC (CABLE, HEAD,

FRONT(,REAR))

(see Section 3.2.5.3).
Remove the TIMING BELT from the carriage.
Use the box driver to rotate and free the adjusting bushing. This bushing holds the SHAFT, CR, GUIDE

to the FRAME, MAIN, RIGHT. Remove the bushing.

Remove the carriage unit together with the SHAFT, CR, GUIDE by pulling the SHAFT, CR, GUIDE a

little to the right.

BUSH,

PARALLEL,

ADJUST

d

\

UIDE

Figure 3-14. Removing the Carriage Unit

Point to Note for Assembly and Adjustment

After removing or rotating the adjusting bushing, you must adjust the platen gap (see Section

4.1 .2).

3-12

REV.-B

3.2.5.5 Removing the PLATEN

1.

2.

3.

4.

5.

6.

7.

Remove the PRINTER MECHANISM from the HOUSING

ASSY.,

LOWER (see Section 3.2.4).

Remove the two

CBP(C)

(M3 X 10) screws that hold the COVER, PLATEN, LOWER to the left and
FRAME, MAIN, RIGHT. Remove the COVER, PLATEN, LOWER.
Remove the COMPRESSION SPRING, 200 that holds the platen shaft (see Section 3.2.5.2, step 2).
Set the head LEVER, G, ADJUST to the most forward position.
Remove the two clips that hold the LEVER, RELEASE to the platen shaft. Remove the LEVER, RELEASE

from the platen shaft.

Rotate the bushing by using the tweezers that holds the platen to the FRAME, MAIN, LEFT. Remove

this BUSHING, 8 with the GROUND SPRING.

Rotate the BUSHING, 8 by using the tweezers that holds the platen to the FRAME, MAIN, RIGHT.
Remove the PLATEN by lifting it up toward the right.

CBP(C)

(M3 X 10) Screws

‘“sH’Q~JD,pR,\\

LEVER, RELEASE

PLATEN

EXTENSION SPRING, 43

Figure 3-15. Removing the PLATEN

I

Point to Note for Assembly

~1

When inserting the LEVER, RELEASE onto the platen shaft, mesh the LEVER, RELEASE with the

‘

mechanism correctly by positioning it at

th~

mark on the auxiliary release shaft.

Mark

Figure 3-16. LEVER, RELEASE Insertion Positioning

3-13

REV.-B

3.2.5.6 Removing and Disassembling the FRAME, MAIN, RIGHT

1. Remove the PRINTER MECHANISM from the HOUSING

ASSY., LOWER (see Section 3.2.4).

2.

3.

4.

5.

Remove the PLATEN from the PRINTER MECHANISM (see Section 3.2.5.5).
Remove the MOTOR, CR from the FRAME, MAIN, BASE (see Section 3.2.5. 1).
Remove the two CBS(C)(P) (M3 X 10) screws that hold the FRAME, MAIN, RIGHT to the FRAME, MAIN,
BASE. Remove the FRAME, MAIN, RIGHT from the FRAME, MAIN, BASE.
Remove the following items from the FRAME, MAIN, RIGHT in the specified order: MOTOR, PF (see
Section 3.2.5.2), CAM, CLUTCH, TRACTOR, COMBINATION GEAR, 8.5,30, SPUR

WASHER, COMPRESSION SPRING 200, and SPUR GEAR, 16.

CBS(C)(P)

(M3X 10) Screws

~

w

FRAME, MAIN, RIGHT

G, 200

, PF

COMBINATION GEAR, 8.5, ”30 / \ ([

[(~)~

CAM, CLUTCH, TRACTOR ‘

~

Figure 3-17. Disassembling the FRAME, MAIN, RIGHT

GEAR, PLAIN

1~

Point to Note for Assembly

I

II

When installing the PLAIN WASHER, insert it from the front in the direction indicated by the mark.

I

PLAIN

~ASHER

Mark Side

Figure 3-18. Direction for Inserting the PLAIN WASHER

3-14

REV.-B

3.2.5.7 Removing and Disassembling the PAPER GUIDE (Including the DETECTOR

ASSY.,

HP)

1.

Remove the PRINTER MECHANISM from the HOUSING ASSY., LOWER (see Section 3.2.4).

2. Remove the PLATEN from the PRINTER MECHANISM (see Section 3.2.5.5).

3. Remove the FRAME, MAIN, RIGHT from the FRAME, MAIN, BASE (see Section 3.2.5.6).

4. Remove the three springs (32 gm) from the lower side of the PRINTER MECHANISM . (These springs
join the PAPER GUIDE support to the FRAME, MAIN, BASE.)

5. While holding open the clips that secure the PAPER GUIDE to the FRAME, MAIN, BASE, slide the
PAPER GUIDE to the left. Remove the PAPER GUIDE.

6.

7.

8.

Open

the clips that

IDE

AIN, BASE

EXTENSION SPRING, 43

(“ This picture is 80-column)

Figure 3-19. Removing the PAPER GUIDE

hold the SPUR GEAR, 18 to the ROLLER

ASSY.,

PF,

DRIVE. Remove the SPUR

GEAR, 18 from the ROLLER

ASSY.,

PF,

DRIVE.

Remove the ROLLER

ASSY.,

PF,

DRIVE from the PAPER GUIDE.

Slide the PAPER GUIDE support to the right. Remove the PAPER

GUIDE.

GUIDE support from the PAPER

A

PAPER GUIDE

(“

ROLLER

R,

This

18

picture

is

80-column)

PAPER GUIDE A&W., SUPPORT

Figure 3-20. Removing the PAPER GUIDE ASSY., SUPPORT

3-15

REV.-B

9. While holding down the three LEVER ASSY., PF, pull out and remove the SHAFT, RELEASE Remove
the LEVER

ASSY., PF and the COMPRESSION SPRING, 1300 from the PAPER GUIDE.

10. While holding open the clips that secure the DETECTOR

ASSY., RELEASE to the PAPER GUIDE,

remove the DETECTOR

ASSY.,

RELEASE.

LEVER

ASSY.,

PF

(* This picture is 80-column. 136-column

printer has four Paper advance Rollers and

four

sDrinas.

,-

‘~

~—~

COMPRESSION SPRING, 1300

{

%

‘

/

5Ab

(il.

A

‘“./

SHAFT, RELEASE

I

Figure 3-21. Removing the LEVER ASSY., PF

Point to Note for Assembly

I

Insert the SHAFT, RELEASE in the PAPER GUIDE in the way shown in the diagram below.

I

I

Figure 3-22. How to Insert the SHAFT, RELEASE

3-16

REV.-B

3.2.5.8 Removing the DETECTOR ASSY., HP

1. Remove the PRINTER MECHANISM from the HOUSING

ASSY., LOWER (see Section 3,2.4).

2, Remove the clips from the rear side of the FRAME, MAIN, BASE that hold the

DETECTOR ASSY., HP.

Remove the DETECTOR ASSY., HP from the rear of the FRAME, MAIN, BASE.

DETECTOR

ASSY.,

HP

/

Figure 3-23. Removing the DETECTOR ASSY., HP

3.2.5.9 Removing the DETECTOR

ASSY.,

PE,

REAR

1. Remove the PRINTER MECHANISM from the HOUSING

ASSY., LOWER (see Section 3.2.4).

2. Remove the two

CBP(C)

(M3 X 10) screws that hold the COVER, PLATEN, LOWER to the frame. Remove

the COVER, PLATEN, LOWER.

3. Remove the clips that hold the DETECTOR ASSY.,

PE,

REAR in the PAPER GUIDE. Remove the

DETECTOR

ASSY.,

PE,

REAR .

/

DETECTOR ASSY.,

PE,

REAR

Figure 3-24. Removing the DETECTOR ASSY.,

PE,

REAR

3-17

I

I

I

REV.-B

3.2.5.10 Removing the DETECTOR ASSY.,

PE,

FRONT

1. Remove the PRINTER MECHANISM from the HOUSING

ASSY., LOWER (see Section 3.2.4).

2. Open the clips that hold the DETECTOR

ASSY.,

PE,

FRONT to the FRAME, MAIN, BASE. Remove the

DETECTOR

ASSY.,

PE,

FRONT.

DETECTOR ASSY ,

Figure 3-25. Removing the DETECTOR ASSY.,

PE,

FRONT

3.2.5.11 Removing the DETECTOR

ASSY., PLATEN

1,2.Remove the PRINTER MECHANISM from the HOUSING ASSY., LOWER (see Section 3.2.4).

Remove the clips that hold DETECTOR

ASSY., PLATEN to the FRAME, MAIN, LEFT. Remove the

DETECTOR

ASSY.,

PLATEN.

n

7

~~=

DETECTORASSY

/Left

~rame

PLATEN

1’

II

Itll

II

)UU~J

Figure 3-26. Removing the DETECTOR ASSY., PLATEN

3-18

REV.-B

3.2.5.12 Disassembling the TRACTOR ASSY.

1.

2.

3.

4.

5.

Remove the TRACTOR ASSY. from the printer.
Remove the SPUR GEAR, 17 from the SHAFT, TRACTOR.
Remove the FRAME, TRACTOR, RIGHT from the SHAFT, TRACTOR and the SHAFT, TRACTOR, GUIDE.
Remove RETAINING RING from the SHAFT, TRACTOR.
Remove the TRACTOR ASSEMBLY (RIGHT), the PAPER SUPPORT unit, and the TRACTOR ASSEMBLY
[LEFT) from the SHAFT, TRACTOR and SHAFT, TRACTOR, GUIDE.

‘.2/!:”::EMBLy(RIGHT)

SHAFT, TRACTOR, GUIDE

)

/

RETAINING RING

/

/

/

&

%aJ)#

.

SHAFT, TRACTOR

.-

K~{

~

FRAME TRACTOR,

RIGHT’

SPUR ‘GEAR, 17

Figure 3-27. Disassembling the TRACTOR ASSY.

.

3-19

I

REV.-B

3.2.5.13 Arranging the Cables

I

Figure 3-28 shows how the cables are arranged for the PRINTER MECHANISM. When assembling the

printer, make sure that the cables are laid out as shown in this figure.

PRINTER MECHANISM (Bottom)

n

1

—

—

—

A

Mlw

t’

11:

B

lnluiaJl

n n

II

(*This is an 80-column printer.)

Figure 3-28. Arranging the Cables

3-20

REV.-B

CHAPTER 4

ADJUSTMENTS

4.1 ADJUSTING THE PRINTER MECHANISM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

4.1.1 MOTOR, CR Backlash Adjustment

4-1

I

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4.1.2 Platen Gap Adjustment

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4-2

4.2 BIDIRECTIONAL PRINT POSITION ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . 4-4

4.2.1 Overview of Bidirectional Print Position Adjustment . . . . . . 4-4

4.2.2 Bidirectional Print Position Adjustment Procedure . . . . . . . . . . 4-4

4.3 CIRCUIT ADJUSTMENT

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4-6

4.3.1 Adjustment Process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

.

4-6

LIST OF FIGURES

Figure 4-1. MOTOR, CR Backlash Adjustment

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4-2

Figure 4-2. Removing the RIBBON MASK

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4-2

Figure 4-3. The Adjusting Bushing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

.

4-3

Figure 4-4. Platen Gap

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4-3

&

REV.-B

4.1 ADJUSTING THE PRINTER MECHANISM

This section describes the various adjustments you may need to make to the PRINTER MECHANISM.

I

4.1.1 MOTOR, CR Backlash Adjustment

In the MOTOR, CR backlash adjustment, the pinion gear of the MOTOR, CR is meshed
the BELT PULLEY cog. If the pinion gear is poorly aligned, printer operation becomes
accuracy of character alignment during printing suffers.

1.

2.

3.

smoothly with
noisy, and the

Remove the MOTOR, CR, along with the FRAME

ASSY., CR, MOTOR, from the PRINTER MECHANISM

(see Section 3.2.5.1).

Loosen the two CBS(0) (M3X 6) screws that hold the MOTOR, CR to the FRAME

ASSY., CR, MOTOR.

Check the alignment of the MOTOR, CR pinion gear with the BELT PULLEY cog. Move the MOTOR,
CR until you judge that there is a gap of about 0.05

-0.15 mm between the two. Tighten the two

CBS(0) (M3 X 6) screws.

P

o “

/“

\

.

‘ELy*5;

\

/

‘“4

,

J

..0

“

Figure 4-1. MOTOR, CR Backlash Adjustment

4-1

I

I

I

I

I

REV.-B

4.1.2 Platen Gap Adjustment
If you have rotated or reassembled the SHAFT, CR, GUIDE or the adjusting bushing, or if printing is

abnormal, you must adjust the gap between the PLATEN and the

printhead.

1.

2.

3.

4.

5.

6.

7.

8.

Remove the PRINTER MECHANISM from the HOUSING ASSY., LOWER (see Section 3.2.4).

Remove the

printhead

from the carriage (see Section 3.2. 1).

Use tweezers to remove the RIBBON MASK from the carriage.

+

‘

/

RIBBON MASK

\

“riage

Figure 4-2. Removing the RIBBON MASK

Remount the

printhead

on the carriage.
Set the paper-thickness LEVER, G, ADJUST to position O (the second step position).
Move the LEVER, RELEASE back to the friction setting.
Move the carriage until the edge of the

printhead

is at the 5th column print position.
Use the box driver (7 mm) to rotate the adjusting bushing on the FRAME, MAIN, RIGHT of the PRINTER
MECHANISM.

Box Driver

+/

BUSH, PARALLEL, ADJUST

Figure 4-3. The Adjusting Bushing

4-2

9.

10.

11.

12.

13.

14.

15.

REV.-H

Rotate the adjusting bushing until the platen gap is large enough for a thickness gauge of 0.44

mm thickness but too narrow for one of 0.47 mm thickness.

0.45

mm

%1

L

(y

PLATEN

Printhead

/

+

Figure 4-4. Platen Gap

Move the carriage until the edge of the

printhead

is at the 75th column print position.

Use the box driver (7 mm) to rotate the adjusting bushing on the FRAME, MAIN, RIGHT of the

PRINTER MECHANISM.

I

Rotate the adjusting bushing until the platen gap is large enough for a thickness gauge of 0.44
mm thickness but too narrow for one of 0.47 mm thickness.
Move the

printhead

back again so that the edge of the

printhead

is at the 5th column print position.
Check the platen gap again with the thickness gauge. It should still be large enough for a thickness
gauge of 0.44 mm thickness but too narrow for one of 0.47 mm thickness. If this is not the case,
go back to step 8.
Center the carriage. Check the platen gap again with the thickness gauge. It should still be large
enough for a thickness gauge of 0.44 mm thickness but too narrow for one of 0.47 mm thickness.
If this is not the case, go back to
Remove the

printhead, install the

step 8.
RIBBON MASK and then replace the

printhead.

I

4-3

REV.-B

4.2 BIDIRECTIONAL PRINT POSITION ADJUSTMENT

This section describes how to adjust the bidirectional print position to ensure correct printing alignment.

4.2.1 Overview of Bidirectional Print Position Adjustment

This printer prints characters when the carriage is moving in either direction (i.e., from left to right or
from right to left).

Adjustment is necessary to ensure that the printing of characters in one direction is properly aligned
with the printing of characters in the opposite direction. For example, if the print position is out of
alignment, printing of a vertical line shows staggering because of the skew effect.

It is important to readjust the bidirectional print position if anything has been done to the gear
arrangement that might affect this printing alignment. By making the timing lag a fraction during
printing while the carriage moves from right to the left, it is possible to line up the printing done in
this direction so that it will match the printing done in the left to right direction. This procedure to alter
the timing is called bidirectional print position adjustment.

The degree of bidirectional printing skew differs, depending on the unique characteristics of each

I

PRINTER MECHANISM. For this reason, there is no standard skew correction value that can be applied

to each printer. The unique skew correction value for each printer has to be written to

EEPROM

on the

I

BOARD ASSY., MAIN (C062 MAIN BOARD).

I

Whenever the PRINTER MECHANISM, or the BOARD ASSY., MAIN (C062 MAIN BOARD) itself, is
changed during

sevicing,

the bidirectional print position must be readjusted and a new bidirectional

skew correction value must be written to

EEPROM.

4.2.2 Bidirectional Print Position Adjustment Procedure

Initial operation
Before performing the bidirectional alignment adjustment, complete the initial operation below:

I

‘

Position the LEVER, G, ADJUST at position O. *

Verify that the DIP switch 1-6 is on).

“

Verify that the DIP switch setting for country is U.S. (DIP switches 1-1, 1-2, 1-3 are on).

“

Load paper.

● Feed at least 10 lines.

● Turn the printer off.

NOTE: The printer enters unidirectional printing mode automatically from the top of form to the line

10 position on the paper, because this improves paper-feed accuracy. Therefore, you must

perform the bidirectional alignment adjustment after 10 lines or more have been fed.

Adjustment operation

The alignment procedure is as follows:

1. Turn the printer power on while pressing the ALT,

LF\FF,

and LOAD\ EJECT buttons.

2. The printer enters draft mode and prints the reference value and

“1”

characters for 4 lines.

4-4

REV.-A

Are the characters aligned vertically?

NO ~ GO TO STEp 30

YES ~

GO TO STEP 4.

3. Referring the odd-numbered lines (Ist and 3rd), adjust the even-numbered lines (2nd and 4th).

“ If the even-numbered lines are shifted to

~

Press the LOAD/EJECT button once while

+ 1 and even lines shift to the left.)

● If the even-numbered lines are shifted to

the right:
pressing the ALT button. (The reference value increases

the left:

4.

5.

6.

7.

~

Press the

LF/FF

button once while pressing the

ALT

button. (The reference value decreases — 1

and even lines shift to the right.)

Press the

ALT, LF/FF,

and LOAD/EJECT buttons at the same time.

The printer enters

LQ

mode, and the printer prints the reference value and the

“1”

characters for 4

lines.

Are the characters aligned vertically?

NO ~

GO TO STEP 6.

YES

~

GO TO STEP 7.

Referring to the odd-numbered lines (1st and 3rd), adjust the even-numbered lines (2nd and 4th).

● If the even-numbered lines are shifted to the right:

~

Press the LOAD/EJECT button once while pressing the

ALT

button. (The reference value

increases + 1 and even lines shift to the left.)

● If the even-numbered lines are shifted to the left:

~

Press the

LF/FF

button once while pressing the

ALT

button. (The reference value decreases — 1

and even lines shift to the right.)

Turn printer power off.

4-5

REV.-B

4.3 CIRCUIT ADJUSTMENT

I

The BOARD ASSY.,

MAIN

(C062 MAIN BOARD) contains variable resistor VR1, which is used for

balancing the circuitry. When any of the following parts are replaced, the circuitry must be balanced
again by adjusting this variable resistance:

R14, RI 5, R13,

C8,

and VR 1

If the circuitry is not correctly balanced in this way, the CPU A\D converter fails to function normally
and printer operation is affected.

4.3.1 Adjustment Process

I

Attach a digital multimeter to the check terminal TP2

(Vref

voltage) on the BOARD ASSY., MAIN (C062

MAIN BOARD). Turn on printer power and turn variable resistor

VR1

until a reading of 4.741 V is

obtained.

4-6

REV.-B

5.1

5.2

5.3

5.4

CHAPTER 5

TROUBLESHOOTING

OVERVIEW

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5-1

REPAIR BY UNIT REPLACEMENT

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5-2

REPAIR OF THE BOARD

ASSY., MAIN

(C062

MAIN BOARD)

..................................................................".."."...

5-14

REPAIR OF THE PRINTER MECHANISM

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5-17

Figure 5-1.
Figure 5-2.

Table 5-1.
Table 5-2.
Table 5-3.
Table 5-4.

Table 5-5.

LIST OF FIGURES

Troubleshooting Procedure

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5-1

Printhead

Resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

.

5-8

LIST OF TABLES

Motor and

Printhead

Coil Resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1

Error Codes

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5-1

Symptoms and Reference Pages

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5-2

Repair of a Problem in the BOARD

ASSY., MAIN

(C062

MAIN BOARD)

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5-14

Repair of the PRINTER MECHANISM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5-17

5.1 OVERVIEW

Problems in the printer may exhibit a variety of

troubleshooting,

symptoms,

unless you follow the procedure shown in the

START

5.2 5-2

Repair by
unit replacement

I

REV.-B

which can complicate the task of

flowchart below.

[

1

5.3

5-14 5.4

5-15

Repair of the

Repair of the printer

BOARD

ASSY., MAIN

mechanism

.

The fault is corrected

Figure 5-1. Troubleshooting Procedure

The following tables provide troubleshooting information.

Table 5-1. Motor and

Printhead Coil Resistance

I

Part

Specifications

I

MOTOR, CR

Coil resistance 19.5 ohms

+/–

7% at 25 degrees C (77 degrees F)

MOTOR, PF

Coil resistance 79.0

+/–

5 ohms at 25 degrees C (77 degrees F)

Printhead

Coil resistance 45.5

+/–

3.2 ohms ‘at 25 degrees C (77 degrees F)

Table

3-2.

Error Codes

Error

Display

Error Cause

Buzzer beeps 3 times for Paper-out error

● Printer is out of paper.

0.1 second, with O.

l-sec-

. DETECTOR

ASSY.,

PE, FRONT (, REAR)

ond

intervals.

Buzzer

beeps 5 times for

Carriage error

. MOTOR, CR malfunction.

0.5 second, with

0.5-sec-

1

.

Carriage mechanism malfunction.

ond

intervals. ● MOTOR, CR driver current malfunction.

I

I

I

REV.-B

5.2 REPAIR BY UNIT REPLACEMENT

For most problems, it is sufficient for you to determine the difficulty to the unit level. Refer to Table

5-3, identify what the problem is, then perform the checks according to the corresponding flowchart.

Table 5-3.

Svm~toms and Reference Pages

—. .

Symptom

Problem

See Page

Printer fails to operate

when

● Carriage does not move.

5-3

power is on.

c

Control panel indicator lamp does not light.

Carriage operation is abnor-

. Carriage moves away from home position at power

5-4

real.

on.

● The carriage returns to the home position correctly,

but the printer then fails to enter the READY mode.

Printing is faulty during

self-

. No printing at

all.

5-5

test, but carriage operation is

. Faulty printing - some of the dots are not printed.

normal.
Paper feeding is abnormal.

. No paper is fed.

5-9

●

Regular paper feed, but with variations in the separa-

tions between lines.

Control panel operation is

●

When the LF switch is activated, no paper is fed.

5-12

abnormal.
Printing of data sent by the

●

Carriage operates normally at power on, and self-test

5-13

host computer is faulty.

is executed correctly.

● Print data from the computer, however, is not printed

correctly.

The repair procedure flowcharts are represented using the following symbols:

Start

o-

Branching

Processing

v

Returning to the Start of the item

Forwarding to another

v

End

item

Decision

5-2

REV.-B

(1) Printer Fails to Operate when Power is On

START

I

Use correct AC

input voltage.

Replace the fuSe
and disconnect

:~;:don

the main

No

is turned ON

again,

Measure the output voltage
from the Power

Supply board.

.

<

No

1

1

Replace the

PRINTER

MECHANISM.

1

Replace the BOARD ASSY.,

PoWER SUPPLY.

*

I

1

I

I

*

END

5-3

REV.-B

(2) Carriage Operation is Abnormal

CN 12,CN8,CN9,CN 10,

CN4,CN5,CN6,

and CN7

connecting the BOARD

ASSY.,

MAIN and the PRINTER

MECHANISM inserted

Secure connectors.

I

Yes

I

No

4

*

END

No

Yes

Refer to section 5.5,
Repair of the PRINTER
MECHANISM.

No

the fault corrected?

Replace the BOARD

ASSY.,

Yes

MAIN.

*

END

5-4

REV.-B

Printing is Faulty During Self-Test, but Carriage Operation is Normal

(

START

Set the head LEVER,G,

ADJUST to the 2nd

position, and perform

>

and CN7 connecting the

BOARD

ASSY.,

MAIN

any

ao~

mlsslngf

and the PRINTER MECHANISM.

Perform bidirectional
printing adjustment.

o

A

No

the fault corrected?

Replace the printhead

Yes

the fault corrected?

Replace the BOARD
AS

SY.,

MAIN.

Q

END

.

Check printhead
resistance.

Yes

Replace

pluggable

chips.

Yes

Replace printhead.

Replace

printhead

and logic

PCB.

Yes

No

No

Replace logic

PCB.

Q

D

I

Check printhead
resistance again.

I

T

I

Replace

printhead.

Replace

printhead

+

cable.

/ \

k

1

I

1

Perform final
test.

REV.-A

#20
#40
#60

#80

TEMP2

#20

tl12

#24

@ @ @ Q/’@\g

g

&

@ @ @

@{@@@@~

--—.

TEMP1 *4

# 8 #16

cOM.

H

21 tIi3 #5

<

Terminal Assignment )

o

0::

o

#5

o

#7

o

#9

o

#11

Oqls

o

#15

o

#17

o

#19

o

#21

o

423

# 240

< Wire Assignment )

Coil Resistance:

45.5

~3.2 Q

at 25°C

(Between each dot wire and common.)

Figure 5-2. Printhead Resistance

5-8

(4) Paper Feeding is Abnormal (but Printing is Normal)

START

<

No

Load the paper correctly.

i

6

A

platen knob rotate

manually with power

Refer to

seCtiOn

5.5,

‘T’

Yes

Repair of the PRINTER

MECHANISM.

I

Replace the BOARD

ASSY.,

MAIN.

No

4

No

Replace the BOARD

ASSY.,

MAIN.

Refer to

seCt;On

5.5,

Replace the BOARD

ASSY.,

Repair of the PRINTER

MAIN and the MOTOR, PF.

MECHANISM.

I

,

I

v

5-9

REV.-A

No

Yes

1

Replace logic PCB.

Replace defective
m oto r.

NOTE

<

NOTE

n

B

Check motor resistance.

Perform final

test.

No

Replace motor and

1/0

cable.

END

NOTE

Replace motor.

I

Yes

NOTE

No

No

v

3

1

Yes

I

Perform final test.

I

NOTE: Perform bidirectional print alignment adjustment.

5-1o

1

Inspect gears for damage
or debris.

3

Clean or replace.

Check left and right tractor

No

Yes

assembly for proper phasing.

<

.

Adjust phasing or replace

w

sprocket assembly.

No

Yes

Inspect

paper path.

Reform final test.

END

5-11

REV.-B

(5) Control Panel Operation is Abnormal

ASSY

MAIN connected

Reinsert connector CN3
correctly.

k“

No

Is the

fault corrected?

Yes

I

T7

END

v

No

Replace the BOARD ASSY.,
PANEL.

No

Replace the BOARD ASSY., MAIN.

T7

Replace the BOARD ASSY., MAIN.

Replace the BOARD

ASSY.,

PANEL.

*

5-12