Epson LQ-300 Service manual

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Page 1

EPSON

EPSON France S.A.

SERVICE MANUAL

LQ-300

PRODUIT

Page 2

EPSON

TERMINAL

PRINTER

LQ-300

SERVICE MANUAL

EPSON

Page 3

NOTICE

The contents of this manual are subjects to change without notice. Alleffortshavebeen made toensuretheaccuracy of

thecontentsofthis

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 consequence thereof. Epson is registered trademark of Seiko Epson Corporation. General Notice: Other product names used herein are foridentication purposes only and maybe

trademarks of their respective

carnpanies.

-i-

Nagano,

Japan

Page 4

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 DANGER Headings.

WARNING

Theprecautionary measures itemized below should alwaysbe observed when performin

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

grepair/

maintenance procedures.

DANGER

ALWAYS DISCONNECT THE PRODUCT FROM BOTH THE POWER SOURCE AND PERIPHERAL DEVICES PERFORMING ANY MAINTENANCE OR REPAIR PROCEDURE.

NO WORK SHOULD BE PERFORMED ON THE UNIT BY PERSONS 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 UNITTOA 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.

UNTAMILIARWITH

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 VOLT-

AGE, LISTED ON THE SERIAL NUMBER/RATING PLATE. IF

HAS A PRIMARY AC RATING DIFFERENT FROM 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 REMOVING OR REPLACING PRINTED CIRCUIT BOARDS AND/OR INDIVIDUAL CHIPS.

IN ORDER TO PROTECT SENSITIVE MICROPROCESSORS AND CIRCUITRY, USE STATIC DISCHARGE EQUIPMENT, SUCH AS ANTI-STATIC WRIST STRAPS, WHEN ACCESSING INTERNAL COMPONENTS.

REPLACE MALFUNCTIONING COMPONENTS ONLY WITH THOSE COMPONENTS BY THE MANUFACTURE; INTRODUCTION OF SECOND-SOURCE NONAPPROVED COMPONENTS MAY DAMAGE THE PRODUCT AND VOID ANY APPLICABLE EPSON WARRANTY.

THE

EPSON PRODUCT

Ics

OR OTHER

- ii -

Page 5

PREFACE

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

LQ-300.

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

CHAPTER 1. PRODUCT DESCRIPTION

Provides a

CHAPTER 2. OPERATING PRINCIPLES

Describes the theory of printer operation.

CHAPTER 3. DISASSEMBLY AND ASSEMBLY

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

CHAPTER 4. ADJUSTMENTS

Includes a step-by-step guide for adjustment.

general product overview, lists specifications, and illustrates the main components of the printer.

CHAPTER 5. TROUBLESHOOTING

Provides Epson-approved techniques for adjustment.

CHAPTER 6. MAINTENANCE

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

APPENDIX

Describes connector pin assignments, circuit diagrams, circuit board component layout and exploded diagram.

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

iv -

Page 6

REVISION SHEET

f=”:

Revision

Rev. A

Issue Date

September 28, 1994

Revision Page

1st issue

-v-

.-..>

.$...

.,,

Page 7

TABLE OF CONTENTS

CHAPTER 1. CHAPTER 2. CHAPTER 3.

CHAPTER

CHAPTER 5. CHAPTER 6.

APPENDIX

PRODUCT DESCRIPTION OPERATING PRINCIPLES DISASSEMBLY

AND ASSEMBLY ADJUSTMENTS TROUBLESHOOTING MAINTENANCE

. .

vi -

Page 8

CHAPTER 1 Product Description

Table of Contents

1.1 FEATURES

1.2 SPECIFICATIONS

1.2.1 Hardware Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.2.1.1

1.2.1.2

1.2.1.3

1.2.1.4

1.2.1.5

1.2.1.6

1.2.1.7

1.2.1.8

1.2.1.9

Paper Handling Specifications . . . . . . . . . . . . . . . . . . . . . . . . . .

Paper Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Printable Area... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Ribbon Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Environmental Conditions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Reliability. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Safety Approvals. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Physical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.2.2 FirmwareS pacifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.3 INTERFACE SPECIFICATIONS

1.3.1 Paraliellnterface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.3.1.I Compatible Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.3.1.2 Reverse Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.3.2 Serial Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.3.3 Interface Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.3.4 Preventing the Host from Data TransferTimeout . . . . . . . . . . . . . . . . .

1-1

1-2

1-2 1-3

1-4

1-5

1-7 1-7 1-7

1-11

1-11 1-11 I-13

1-14 1-15 1-15

1-7 1-8 1-8 1-8

1.4 OPERATING INSTRUCTIONS

1.4.1 Control Panel Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.4.2 Self-test Function. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.4.3 Hexadecimal Dump Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.4.4 Micro Adjustment Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.4.5 PrinterStatus Indication.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.4.6 Selected Font . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.4.7 Printer Initialization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.4.7.1 Power-on Initialization. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.4.7.2 Hardware Initialization. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.4.7.3 Software Initialization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.4.8

PrinterSettings

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

1.4.8.1 Selectable

PrinterSettings

.......:.

. : . . . . . . . .

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

1.4.8.2 Changing the Default Settings. . . . . . . . . . . . . . . . . . . . . . . . . .

1.5 MAIN COMPONENTS

1.5.1

C143 MAIN Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.5.2 C130PSB/PSE Board. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.5.3 Printer Mechanism (M-5M1O) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.5.4 Housing Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. .

1-16

1-16 1-17 1-17 1-18 1-18

1-19 1-19 1-19 1-19 1-19 1-20 1-20 1-20

1-24

1-24 1-24 1-25

1-25

Page 9

List of Figures

Figure 1-1. Exterior View of the LQ-300. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure l-2. Pin Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure l-3. PrintableAreafor Cut Sheets . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure l-4. PrintableAreafor Envelopes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure l-5.

Figure l-6. Data Transmission Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure

Figure l-8. C143 MAIN Board Component Layout . . . . . . . . . . . . . . . . . . . . . .

Figure l-9.

Figure 1-10. Printer Mechanism (M-5 M1O). . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 1-11. Housing Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

PrintableAreafor

1-7.

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

C130

PSB/PSE Board Component Layout . . . . . . . . . . . . . . . . . . 1-24

Continuous Paper . . . . . . . . . . . . . . . . . . . . . . . .

1-1 1-2 1-5 1-6

1-6 1-11 1-16 I-24

1-25 1-25

List of Tables

Table l-1. Optional Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table l-2.

Table l-3. Feeding Speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table 1-4. Specifications for Cut Sheet Paper (CSF). . . . . . . . . . . . . . . . . . . . .

Table 1-5. Specifications for Cut Sheet Paper (Manual Insertion) . . . . . . . . . . . 1-4

Table Table Table Table Table Table Table Table Table Table Table Table

Table Table Table Table Table

Table l-23. Graphic

Table l-24. Software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Tablel-25.interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table l-26. Bit Rate. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table 1-27. Parity Bit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table 1-28. Data Length. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

PaperThickness

-6. Specifications forEnvelopes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

-7. Specifications for Continuous Paper (Single Sheet and Multi-Part) . 1-4

-8. Specifications for Continuous Paper with a Label. . . . . . . . . . . . . . . 1-5

-9. Electrical Ranges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

-lO.

CharacterTables.

-11. Resolution. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

-12. Printing Speed. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

-13. Signal and Connector Pin Assignments forthe Parallel Interface. 1-12

-14. Signal and

-15. Signal and Connector Pin Assignments

-16. Paper Feeding Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

-17. Font Selection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

-18. Font Lightsand Language Selection . . . . . . . . . . . . . . . . . . . . . . .

-19. Default Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

-20.

CharacterTables.

-21. Page Length . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

-22.

SkiDOver

EX~/ACK/

Perforation/Auto TearOff/AGM/Auto Line Feed

State Reply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Ptint

LeverSettings . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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

ConnectorPin

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

Direction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Assignments

forthe

forthe Serial Interface . . 1-14

Parallel Interface. 1-13

1-1

1-4

1-7 1-8 1-9

1-10

1-17

1-19

1-20

1-21

1-21 1-22

1-22 1-22 1-22 1-22 1-22 1-23 1-23

1-3 -

,’:~\

(:;

f“~.

. .

Page 10

LWOO

Service

Manual

Product Description

1.1 FEATURES

The LQ300 is a small, light-weight, 24pin serial impact dot-matrix color printer suitable for personal use. The major features of this printer are:

●

Fast printing of

●

Compact design saves precious work space

●

Easy-to-operate panel

● Quiet printing

●

Two built-in 8-bit parallel interfaces and an

●

Printing of up to 66

●

Optional color printing using a color ribbon (black, magenta, cyan, yellow)

●

Detachable tractor (push, pull, and push-pull tractor feed)

lo-cpi

draft characters at 200 cps

kes

A4-size

or 62 lines on letter-size paper

EIA-232D

serial interface

Figure 1-1 shows an exterior view of the the

LQ-300.

Power

LQ-300,

and Table 1-1 lists the optional units available for

~’”pe’”Q@’

lease r

Knob

Sprocket

Center

support

Tractor unit

Figure 1-1. Exterior View of the LQ-300

Table 1-1. Optional Units

Model

#77!53

#7755

#7768 S015077 C80637* C83211•

C80030*

The number represented by an asterisk varies depending on the country.

Rev. A

Ribbon Ribbon

oartridge

Ribbon cartridge (film) Ribbon

oartridge

Single-bin cut sheet feeder Color upgrade kit

Pull tractor unit

Description

(monochrome)

(monochrome, sub-cartridge)

(color)

lever

“l-1

Page 11

Product Description

1.2 SPECIFICATIONS

This

section

1.2.1

provides detailed information about the

Hardware

Specifications

LQ-300.

LQ-300

Service Manual

.T,

,’

Printing

Pin arrangement: Pin diameter:

method:

m m

‘o

5erial

impact dot matrix

12 x 2, staggered

0.20 mm (0.0079 inches)

11( )

13 () 15 ()

17<

19()

21 ()

22 ()

L“?”’”

5() ! 7() 9

( )

)

{

(

)

( )

()

(

)

()

;;: )22

L’24

‘o

.., .-

HEAD CENTER

Printing direction:

Figure 1-2. Pin Configuration

Bidirectional with logic seeking for text and unidirectional for graphics. (Bidirectional printing of graphics can be selected with a printer

setdng or software command.)

. . . . .

1-2

Rev.

Page 12

LWOO

Service

Manual

1.2.1.1 Paper Handling Specifications

Paper paths

Cut sheet path:

Rear entry (manual insertion or optional Cannot handle multi-part paper using friction feed

Continuous paper paths:

Rear entry ( push tractor feed using the push tractor unit or pull tractor feed using the pull tractor unit or push-pull

tractor feed using both tractor units) Continuous paper parking:

CSF:

Feeding pitch:

Feeding system:

❑

Friction feed

● Set the release lever to the friction position.

Possible, using push tractor unit Cannot handle envelopes or multi-part paper

% ~~, 1A $%o

~ch, or Programmable feeding in increments of

inch, minimum

Friction feed or

. Insert the left edge of the sheet at the marked position.

●

not.perform

reverse feed in the area within 0.63 inch (16 mm) from the bottom edge of

the sheet.

Push tractorfeed

● Set the release lever to the tractor position.

●

Install the tractor unit in the rear in the push

●

On the first page (that is, the page immediately after sheet loading) the accuracy of paper feeding is not guaranteed within the area 0.87 inch (22 mm) from the top edge of the sheet.

●

On the last page, the accuracy of paper feeding is not guaranteed after the paper comes off the tractor pins.

●

During printing

●

not eject the labels from the rear.

oflabels,

never perform reverse feeding.

&actor

Product Description

CSF)

(push, pull, and push-pull) feed

position.

❑

Pull tractor feed

● Set the release lever to the tractor position.

. Install the tractor unit in the top in the pull tractor position.

● Do not perform reverse feeding.

● Do not eject them from the rear.

Push pull tractor feed

●

Set the release lever to the tractor position.

●

Install one tractor unit in the rear in the push tractor position and install the other tractor unit

in the top in the pull tractor position.

. Do not perform reverse feeding.

●

not eject the paper from the rear.

Paper thickness

leve~

The adjust lever must be set to proper position for the paper thickness, as shown below.

Table 1-2. Paper Thickness Lever Settings

Lever Position

1 2

4 5

Paper-feeding speed:

Paper Thickness

0.065 mm -0.12 mm (0.0026 in. -0.0047 in.)

0.12 mm -0.19 mm (0.0047 in. -0.0075 in.)

0.19 mm -0.26 mm (0.0075 h. -0.01 in.)

0.26 mm -0.32 mm (0.01 in. -0.013 in.)

0.32 mm -0.44 mm (0.013 in. -0.017 in.)

0.44 mm -0.52 mm (0.017 in. -0.02 in.)

See Table 1-3.

Corresponding Paper

Ordinary paper Multi-part forms (2 sheets)

Multi-part forms (3 sheets)

Multi-part forms (4 sheets) Envelopes (20 lb.) Envelopes (24

lb.)

Rev. A

1-3

Page 13

Product Description

LQ-300 Service Manual

Table 1-3. Feeding Speed

Lever Position Feeding

Friction Tractor Friction

o, 1

2-5

Tractor

Feed speed is varies depending on the motor driving voltage.

1/6

inch Line Feed Continuous Feed

Max. 94 ins/line

Typ.

80 ins/line (*)

Min. 75 ins/line Min. 2.8

I I

Max. 106

Typ.

Min 94

redline

104 ins/line (*)

m.s/line

1.2.1.2 Paper Specifications

Table 1-4. Specifications for Cut Sheet Paper

Width Length

Thickness Weight

Qualitv

182 mm -216 mm (7.2 in. -8.5 in.) 210 mm -364 mm (8.3 in. -14.3 in.)

10.07

64-90 Plain

mm -0.12 mm (0.0028 in. -0.0047 in.)

g/m2

(18 -24 lb.)

oaDer. recvcled DaDer

Table 1-5. Specifications for Cut Sheet Paper (Manual Insertion)

Max 3.6

Typ.

Max. 2.8

Typ.

Min. 2.2 incheskec.

incheslsec.

3.3 incheshec (*)

inchhec.

incheslsec.

2.5 inche.shec.’

(CSF)

Width

Length Thickness Weight

Quality

148 mm -257 mm (5.8 in. -10.1 in.) 182 mm -364 mm (7.2 in. -14.3 in.)

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

g/m2

52.3-90

Plain paper, recycled paper

(14 -24 lb.)

Table 1-6. Specifications for Envelopes

Size

Thickness

Weight Quality Bond paper (not curled, folded, or crumpled), plain paper, airmail paper

Notes: .

Printing of envelopes is guaranteed only at room temperature and normal humidity (15

No.

No. 10

0.16 mm - 0.52 mm (0.0063 in. - 0.0197 in.)

45- 91

- 25° C (59 - 77° F) ,20- 60%

● Variations in envelope thickness must be less than 0.25 mm (0.0098 in.).

. When inserting envelopes, keep the longer side horizontal.

Width x Length: 166 mm x 92 mm (6.5 in. x 3.6 in.)

Width x Length: 240 mm x 104 mm (9.5 in. x 4.1 in.)

g/m2

(12 -24 lb.)

RI-I).

Table 1-7. Specifications for Continuous Paper (Single Sheet and Multi-Part)

Width Total thickness Weights

Copies Quality

101.6 mm - 254 mm (4.0 in. - 10.0 in.)

0.065 mm - 0.32 mm

52.3- 82

40- 58.2 4 sheets (1 original + 3 copies) Plain paper, recycled paper, carbonless multi-part paper

g/m2

(14 - 22 lb.) — not multi-part

g/m2

(12 - 15 lb.) — multi-part

(0.0025 in. - 0.012 in.)

1-4

Rev.

Page 14

LQ-300 Service Manual

Table 1-8. Specifications for Continuous Paper with a Label

Product Description

Label size (W x L)

Width of base paper Thickness of base

paper Total thickness Weight Quality

Notes:

1.2.1.3 Printable Area

Cut sheets

●

Use only continuous-type labels and use them only with the tractor.

. Examples of labels

●

Printing of envelopes is guaranteed only at room temperature and normal humidity (15

- 25° C (59 - ’77° F) ,20-

3mm[0.12”]

minimum

63.5 mm (min.) x 23.8 mm (min.) [ 2.5 in. (min.) x 15/16 in. (min.)]

101.6

0.07 mm - 0.09 mm (0.0028 in. - 0.0031 in.)

0.16 mm -0.19 mm (0.0063 in. - 0.0075 in.) 68 g/m2 (17 lb.) Plain paper

mm -254 mm (4.0 in. x

—Avery Continuous Form Labels

—Avery Mini-Line Labels

6(Mo

RI+).

3mm[0.12”]

G-

—

minimum

10,0

in.)

— —

—

Printable area

—

Figure 1-3. Printable Area for Cut Sheets

5,3mm[0.2”]

minimum

9mm[0.35”]

minimum

.. :.,

Rev. A

1-5

Page 15

Product Description

Envelopes

LQ-300 Service Manual

3mm[0.12”]

minimum

Continuous paper

3mm[0.12”]

Printable area

minimum

Figure 1-4. Printable Area for

13 mm 10.51 m], ~ minimum

4----++

203.2 mm [8”], maximum

0, 06

0, 0,

.o---0, 0,

0, 0,

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

0, 0,

Q-r--

0, 0,

0, 0, 0, 0, 0, 0

0, 0,

Envelopes

,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0

,0 ,0

,0 ,0 ,0

,0 ,0 ,0 ,0 ,0

,0 ,0 ,0 ,0

,0 ,0 ,0

5.3mm[0.21”]

minimum

13.5mm[0.53*]

minimum

1-6

Figure 1-5. Printable Area for Continuous Paper

Rev.

Page 16

LQ-300 Service Manual

1.2.1.4 Ribbon Specifications

Product Description

Ribbon cartridge (mono):

#7753

#7755 (sub-cartridge) Ribbon cartridge (film): Ribbon cartridge (color):

Ribbon color: Black ribbon life:

Film ribbon life:

#7768

S015077

Black, magenta, cyan, yellow

2 million characters (48 dots/character)

0.2 million characters

(48

dots/character)

Color ribbon life

Black: 1 million characters (48 dots/character) Magenta: cyan: Yellow:

0.7 million characters (48 dots/character)

0.5 million characters (48 dots/character)

1.2.1.5 Electrical Specifications Table 1-9. Electrical Ranges

Description 120 V Version 230 V Version

Rated voltage

Input voltage range

Rated frequency range Input frequency range Rated current

I I

120

VAC

103.5-132 VAC 198-264

50- 60

49.5- 60.5

1.1 A

t-fz

220-240

VAC VAC

0.6 A

Dielectric strength

1.2.1.6 Environmental Conditions

1000

VAC

ms for 1 minute or

1200 VAC

(between AC line and chassis)

Temperature range:

Operation:

5to35“C (41 to 95 “F)

Operation (film ribbon): 15to35‘C (59 to 95 ‘F) Operation (envelopes,

labels, or recycled paper): 15to25‘C (59 to Storage:

–20 to55‘C (-4 to

Humidity (without condensation):

Operation: Operation (film ribbon):

5 to

10 to

80?40 RH

80Y0 RH

Operation (envelopes, labels, or recycled paper):

Storage:

20 to

60Y0 RH

W’/. RH

1.2.1.7 Reliability

rms

for 1 second

77°F)

131

‘F)

1500 VAC

(between AC line and chassis)

rms

for 1 minute

MTBF:

Printhead life:

Rev. A

4000

power on hours

(POH)

200 million strokes/wire (with monochrome ribbon)

100 million strokes/wire (with color and film ribbon)

1-7

Page 17

Product Description

1.2.1.8 Safety Approvals

LQ-300

Service Manual

Safety standards:

U.S. version: European version: EN 60950

Radio frequency interference:

(RFI)

U.S. version: European version:

1.2.1.9 Physical Specifications

Dimensions (W x D x H): Weight without

1.2.2 Firmware

tractoc

Specifications

Control codes:

Input data buffer Download memory: Character sets:

Character

tables:

366 x 275x 141 mm (14.4 x 10.8x 5.6 inches) without tractor

4.3 kg (9.5 lb.)

ESC/P2

IBM X24E emulation EPSON remote

8KB

10KB

14 international character sets and one legal character set

Table 1-10. Character Tables

UL1950

with D3,

CSA22.2

#950 with D3

IEC950 (SEMKO, DEMKO,

NEMKO, SETI)

FCC part 15 subpart B class B Vfg.243 EN55022

(VDE0878

(CISPR

PUB. 22) class B

part 3,

pati

30)

,ffq

L-.

Character Table Standard Model NLSP* Model

ITALIC

PC437 (US, Standard Europe) PC850 (Multilingual) PC860 (Portuguese) PC861

(Icelandic) PC863 (Canadian-French)

PC865 (Norwegian) BRASCII Abicomp

PC852 (East Europe) PC853 (Turkish) PC855

PC857

PC864 (Arabic)

PC866 (Russian) PC869 (Greek) PC437 Greek

ISO Latin IT ISO

Code MJK

MAZOWIA

Bulgaria (Bulgaria)

(Cvrillic)

(Turkish)

8859-7

(TuAish)

(Greek)

(Czecho,

(Polland)

Slovakia)

Iolxl

Ixlol

o 0 o 0 o

o x

x o x x

x x x x o

x o x x o x

o o

o o o

Suppotied

‘ NSLP = National Language

1-8 Rev.

x Not

suppofled

Suppori

Page 18

LC?-300

Service Manual

Bitmap fonts:

Scalable fonts:

Character matrix:

Print mode:

Resolution: Printing speed and

printable columns:

Product Description

(10

cpi/

EPSON Draft

(10

cpi/

12 12 12

cpi/

cpi/ cpi) cpi)

EPSON Roman EPSON Saris Serif EPSON Courier EPSON Prestige EPSON Script

EPSON Roman EPSON

!%ns serif

EPSON Roman T

(lOcpi/ 12cpi/ 15cpi/

(10

cpi/

(10

cpi/

(10

cpi/

8-32 points (units= 2 points)

EPSON Saris Serif H 8- 32points (units

Drailt

cpi;

12 horizontal dots, 24 vertical dots

NLQ 10

cpi;

36 horizontal dots, 24 vertical dots

cpi)

cpi/

Proportional)

cpi)

=2points)

Double-width Double-height Condensed Bold Double-strike Italics Super/subscript Outline Shadow Underline (single, double, single-broken, double-broken) Strike-through (single, double, single-broken, double-broken) OverScore (single, double, single-broken, double-broken)

See Table 1-11. See Table 1-12.

Printing Mode

Draft Draft condensed LQ 8-pin bit image

24-pin bit image

Table 1-11. Resolution

Horizontal

Density

dpi

120 240

dpi

360

dpi

120

dpi

120 240

dpi

dpi dpi

dpi

120

dpi

180

dpi

360

Vertical Density

180

dpi dpi

180 180

dpi

180

dpi

180

dpi

180

dpi

180

dpi

180

dpi

Adjacent Dot

Printed?

No No

No Yes Yes

No Yes Yes Yes Yes Yes Yes

Rev. A

1-9

Page 19

Product Description

LWOO Service Manual

Table 1-12. Printing Speed

Printing Mode

Draft

Draft condensed 17

LQ condensed

Vote:

Each maximum print speed is changeable depending on attributes of characters within

Printing Mode

Chg\;gter Printable

10 12 15

20 10 12 15

Maximum Print Speed

Columns

cpi cpi cpi cpi cpi cpi cpi cpi cpi

20 160

c 0.19 mm

96 120 137 160

96 120 137

{

~Th>01,mm{T212

Mode 1

200 240 300

171

200

67 50

80 100

114 86

133 100

>12

“C

--c

<12

“C

.+;:;:;:

V: Normal —

V: Down

V: Normal

Mode 2

133 160

200

114 133

60 75

Down—

Mode 1

—

Mode 3

—

Mode 2

Mode 3

[cps]

Mode 3

F“

100 120 150

100

33 40 50 57 67

<12

“C

{“

Down—

Th: Paper thickness T :

Printhead

V :

Printhead

Mode 3

temperature driving voltage

1-1o

Rev.

,,,

Page 20

LQ-300 Service Manual

1.3 INTERFACE SPECIFICATIONS

Product Description

LQ-300

has a

Centronics<ompatible

parallel interface and an

EIA-232D

serial interface, one of

which can be selected in default setting mode. Auto selection is also available.

1.3.1 Parallel Interface

The parallel interface has two modes:

. Compatible mode

● Reverse mode

1.3.1.1 Compatible Mode

Data format: Synchronization: Handshaking: Signal level: Adaptable comector: Data transmission timing:

Note:

Transition time (rise time and fall time) of every input signal must be less than 0.2

BUSY

ACKNLG

8-bit parallel By STROBE pulse synchronization By BUSY and

Tl_’L-compatible

36-pin 57-30360

ACKNLG

level

(IEEE-P1284

(Amphenol)

signals

level 1 device)

or equivalent

See Figure 1-6.

ps.

DATA

STROBE

—

Figure 1-6. Data Transmission Timing

The BUSY signal is active (HIGH) under the following conditions:

. During data reception (See Figure 1-6.)

●

When the . When the INIT input signal is active . During a printer error . During the self-test mode . During the default setting mode . When the parallel interface is not selected

The ERROR signal is active (LOW) under the following conditions:

. When a paper-out error occurs . When a release lever operation error occurs

●

When a fatal error occurs

innt

buffer is

full

The PE signal is active (HIGH) under the following conditions:

●

Rev.

When a

paper-out error occurs

1-11

Page 21

Product Description

LQ-300

Service Manual

Table 1-13 shows the connector pin assignments and signal functions for the 8-bit parallel interface.

Table 1-13. Signal and Connector Pin Assignments for Parallel Interface

Pin No.

2-9

13 14

15,34

16 17 18

19-30

32 33

35 36

7%e

Signal Name

STROBE

DATAO-DATA7

ACKNLG

BUSY

‘ SLCT

AFXT NC

GND

Chassis LOGIC-H

GND

INIT

ERROR

GND +5V

SLIN 30

//0 column indicates the direction of the signal as viewed from the printer.

GND

(!!%”%

20-27

28 30

. —

— —

. —

29 —

—

‘0’

The STROBE pulse is used to read the input

data. The pulse width must be more than 0.5

Input data is latched after the falling edge of this signal. Parallel input data to the printer.

out the printer is ready to accept more data. The

out

— —

—

out Pulled up to +5

out

—

out Pulled up to +5 V through

A HIGH level means data 1. A LOW level means data O.

This pulse indicates data has been received and

pulse width is approximately 12

HIGH indicates the printer cannot acoept more

data. HIGH indicates paper-out. This signal is effective

only when the ERROR Always HIGH output. (Pulled up to +5 V through

3.3K Q resistor.)

Not used. Not connected. Signal ground. Chassis ground.

Signal ground.

Input for printer initialization. Pulse width 50

minimum, active LOW. LOW indicates that some error has

the printer. Signal ground.

Not used.

Description

U.S.

signal

is LOW.

through 3.9K Q resistor.

o=urred

3.3K Q

resistor.

ps.

{,,’”.

-c.-

‘{‘

1-12

. . .

Rev. A

Page 22

LQ-300 Service Manual

1.3.1.2 Reverse Mode

LQ-300

reverse mode supports

IEEE-P1284

nibble mode, described in this section.

Product Description

Transmission mode: IEEE-P1284 Signal level: Adaptable connector:

IEEE-P1284

36-pin 57-30360

nibble mode level 1 device

(Arnphenol)

or equivalent

Table 1-14. Signal and Connector Pin Assignments for Parallel Interface

Pin No. Signal Name

2-9

15 NC 16

17 Chassis

19-30

31 32

33 34 35 36

The l/O column indicates the direction of the signal as viewed from the printer.

HostClk 19 DATAO-7

Ptrclk

PtrBusy /

DataBit-3,7

AckDataReq DataBit-2,6

Xflag

DataBit-l,5 HostBusy

GND

Logic-H

GND

DataAvail DataBit-0,4

GND

+5 1284-Active

C%%”%

20-27

28 29

30 —

— — —

—

— — — —

‘0’

out

—

out

—

out

—

out

Host clock signal.

Signals

bits O to 7. Printer Printer busy signal and reverse channel transfer

data bit 3 or 7. Acknowledge data request signal and reverse

channel transfer data bit 2 or 6. X-flag signal and

bit 1 or5.

Host busy signal. Not oonnected.

Signal ground.

Chassis ground. Pulled up to +5

Signal ground. Not used. Data available signal and reverse channel

transfer bit O or 4.

Signal ground. Not oonnected. Pulled up to +5 V via 3.3K S2 resistor. 1284 active signal.

DATAO

clook

Description

through DATA7 represent data

signaL

reverse channel transfer data

V via 3.9K Q resistor.

Rev. A

1-13

Page 23

Product Description

1.3.2 Serial Interface

The

LQ-300

is equipped with an 8-bit serial interface, standard.

LQ-300 Service Manual

Data format:

EIA-232D

serial Synchronization: Asynchronous Handshaking:

protocol, X-ON/X-OFF protocol,

ETX/ACK

protocol

DTR

Word length

Start bits: 1 bit Data bits: 7 or 8 bits (selectable) Parity bit: Stop bits:

Bit rate:

Odd, even, or none (selectable) 1 bit

300,600,1200,2400,4800, 9600,19200 bps (selectable)

Logic level

MARK SPACE (logical O):

~OgiCid

1): –3 V to –25 V

+3 v to +25 v

Parity check:

Connectoc

Odd, even, or no parity bit (selectable)

EIA

standard 25-pin D-SUB female comector

Table 1-15. Signal and Connector Pin Assignments for Serial Interface

Pin No. Signal Name

2 3 RXD

4 7

5,6,8-10,

12-19, NC

21-25

l%e

Chassis

Signal

//0

column indicates the direction of the signal as viewed from the printer.

GND

TXD

RTS

GND

REV

DTR

I/o’

—

out

—

out

—

Chassis ground. Transmit serial data. Receive serial data.

Request to send. Always SPACE level when the printer is powered on. Pulled up to

Return path for data and control signals.

Conneoted

Indicates that the printer is ready to receive data or not.

No connection (not used).

directly to the

Description

+12V

DTR

signal.

via 4.7K Q wsistor.

* .

\ ~

1-14

Rev.

,-,...

Page 24

LQ-300 Service Manual

1.3.3 Interface Selection

Product Description

The printer has 2 interfaces: parallel and serial.

These interfaces can be selected manually in

default-setting mode or selected automatically.

●

Manual selection

One of the two interfaces can be selected in default-setting mode.

. Automatic selection

When automatic interface selection is enabled in default-setting mode, the printer is initialized to idle state scanning, in which an interface receives data when it is powered on, and the interface that receives data first is selected. When the host stops data transfer, and the printer is in the standby state for 10 or 30 seconds (time selectable in the default-setting mode), the printer returns to the idle state. As long as the host sends data to the printer interface in the BUSY state, the currently selected interface remains the same.

. Interface state and interface selection

When the parallel interface is not selected, the interface is in the BUSY state. When the

serial interface is not selected, the interface sends X-OFF and sets the

When the printer is initialized or returned to the idle state, the parallel interface is in a

READY state, the serial interface sends X-ON and sets the that the interrupt signal such as a INIT signal on the parallel interface is not effective while that interface is not selected.

1.3.4 Preventing the Host from Data Transfer Timeout

DTR

signal MARK.

DTR

signal SPACE. Notice

Hosts abandon attempts at data transfers to peripherals when a peripheral is in BUSY state for dozens of seconds continuously. To prevent hosts from this

ldnd

of timeout, the printer receives data very slowly, several bytes per minute, even if the printer is in BUSY state. This slowdown is started when the rest of

the

input buffer becomes several hundreds of bytes. Finally, when the

input buffer is full, the printer goes into the BUSY state continuously.

Rev. A

1-15

Page 25

Product Description

LQ-300

Service Manual

1.4 OPERATING INSTRUCTIONS

This section describes control panel operation functions, self-test, hexadecimal dump, paper feed, micro adjustment, and printer initialization methods.

1.4.1 Control Panel Operation

The printer control panel contains three non-lock-type push buttons and three LED indicators for easy operation of the various printer functions.

Buttons

Pause:

Font:

LFIFF:

Indicators

Roman

Saris

Courier*

Seriio

O 0

●

I.ight

Draft

Py:li!: :

Draft O

Condensad

I W ~

● ● I 2

Micro Adjust

Lights

Font

~1’[1

Paper

Buttons

Parkd

/FF

1’

Pause

$!!d

3sec

Figure 1-7. Control Panel

Switches printer status between printing and no printing, if there is print data in the input buffer. When the printer is out of paper, the light flashes and the beeper sounds three times.

S&c&

one of the available fonts. When you hold down this button

while you turn on the printer, you enter When you press this button, the printer feeds paper line by line.

Hold it down to load a single sheet, or to advance continuous paper to next top-of-form position.

the

printer setting mode.

Pause (Orange):

Font 1 and 2 (Green):

Special Mode

Self-test mode: Hex dump mode:

Default-setting mode: Micro adjustment mode: Paper park mode:

Lights when the printer in pause mode. Indicates the currently selected font.

Hold down the Hold down the Hold down the Hold down the Hold down the

LF/FF button

LF/FF

and Font

Font

buttons and turn on

Pause

Font and

and turn on the printer.

buttons and turn on the printer.

button or

LF/FF

buttons together.

Font

the

button.

printer.

1-16

Rev. A

Page 26

LC?-300

Service Manual

Product Description

Table 1-16. Paper Feeding Functions

Tractor Feed

Operations

Not Paper Out Paper Out State

Press

LF/FF

and Font buttons at the same time

Insert a sheet to the manual insetiion slot

(*l):~@n

the printer is in tear-off state,

Paper park (*1)

— —

—

the.w

functions a~ performed after returning from

tear-off position.

(*2)

Gce

a manually inserted sheet is loaded, the printer enters manual insertion mode. After

that, even if data remains

in the buffer, the printer goes into a paper out error state at the end of every a sheet and waits for insertion of the next sheet. The loading operation from the

CSF

or by

initialization.

1.4.2 Self-test Function

section explains how to run the self-test.

Friction Feed

Not Paper Out

Line feed

Eject

—

CSF

is enabled again by sheet

Paper Out State

Load a sheet (*2)

—

After 2 seconds

load the sheet

manuallv

(*2)

the

1. Hold down the

LF/FFbutton

and turn on the printer to start the self-test.

2. If paper is not loaded, the printer attempts to load it.

3. The printer prints alphanumeric characters continuously.

5. Quit self-test mode printing bypressingthe

Pause

button and turning the printer off.

1.4.3 Hexadecimal Dump Function

The hexadecimal dump is a useful tool for troubleshooting data control problems. describes how to run a hex dump.

Turn on the printer while holding down the

If paper is not loaded, the printer attempts to load it (either single sheet or continuous paper).

If the printer cannot Ioad the paper, it indicates a paper-out error. In this case, insert paper again, and press the

The printer waits for data after printing the message “Hex dump(*).”

“Hex Dump”:

“Codes Hexadecirnaux”: “Dump

“Volcado

Received data is printed as both hexadecimal codes and ASCII characters. If a corresponding

esadecimale”:

hex”:

Pause

button.

English or German is selected French is selected Italian is selected Spanish is selected

LF/FF and Font

buttons.

printable character does not exist, the printer outputs a period (.).

Quit hexadecimal dump printing by pressing the PAUSE button and turning the printer off.

Note:

hex dump mode, the character table depends on the default setting, and 10 cpi draft is

selected automatically.

This

section

Rev.

1-17

Page 27

Product Description

LQ-300

Service Manual

1.4.4 Micro Adjustment Function

To enter adjustment mode, press the Pause button for three seconds, until the printer beeps once and the

Pause

lights

bhnk

to indicate that the adjustment

operation is available. If the printer state

is not one of the conditions shown below, this operation is ignored.

● TOF position adjustment:

The position can be adjusted just after the paper is loaded.

● Tear-off position adjustment:

The position can be adjusted when paper is actually located at the tear-off position.

. . .

‘~

In the adjustment mode, press the paper backward. You can cancel adjustment mode by pressing the

LF/FF button

to feed paper forward and the

Pause

Font

button or inputting a

button to feed

print coremand. The adjusted position is stored in non-volatile memory.

1.4.5 Printer Status Indication

This section describes how the printer indicates status and error conditions using LEDs and the beeper.

The symbols below describe the frequency of beeper sounds.

(.):

The beeper sounds for 100 rns with an interval of 100 ma between beeps.

(—): The beeper sounds for500rns.

While initialize

signal is active: During initialization: Standby or printing state: Pause state: Micro adjustment mode:

Tear-off: Paper-out error

state(”l)

Operating error (~), fatal error (*3):

Notes:

Pause light is on. Pause light blinks Pause

light is off

Pause light is on

Beeper sounds (

(light

on:off

Pause light blinks (light

ratio=

●

)

and

Pause light blinks.

1:1)

on:off

ratio=

1:6)

Beeper sounds (.. . ) and Pause light blinks (light

on:off

ratio=

Beeper sounds (—

6:1)

) and Pause light is on.

(*1):

(*2):

(*3):

A paper-out error occurs with any of the following conditions:

●

Paper is not loaded after loading is attempted.

●

A full sheet finishes printing after single sheet loading by manual insertion.

●

The end of

condrmous

paper is reached.

When a paper-out error occurs, the printer stops printing and enters the pause state. After that, when a sheet is loaded, the PAUSE light stops blinking and the light stays on, but

the printer remains in the pause state. Press the PAUSE button to start printing.

An operating error occurs for any of the following conditions:

●

The release lever is set to the TRACTOR position without ejecting cut sheets.

●

The release lever is set the FRICTION position without ejecting continuous paper.

A fatal error occurs with any of the following conditions:

●

Power supply voltage is abnormal.

●

Printhead temperature is abnormal.

1-18

Rev. A

Page 28

LQ-300 Service Manual

1.4.6 Selected Font

Product Description

The combination of two To choose one of the seven internal fonts listed on the control panel, press the

Font

LEDs (1 and2) is used to indicate the selected font.

Font

button.

Table 1-17. Font Selection

Selected Font\ Font 1

Roman Saris Serif

Courier

Prestiae script

Draft Draft condensed

Light I

On On

off

Blinkina

Blinking

On off

Font2 Light

On off

off

Blinking

off

1.4.7 Printer Initialization

There are three types of initialization: software initialization.

power-on initialization, hardware initialization, and

1.4.7.1 Power-on Initialization

The power-on initialization is performed by turning the printer powered on. When the power-on initialization is performed: . The printer mechanism is initialized.

●

The

hardware initialization is performed.

1.4.7.2 Hardware Initialization

Hardware initialization is performed by: . Turning on the printer. . The falling edge of a negative pulse ora low signal on theparallel interface

/INITline.

When hardware initialization is performed:

●

Print data in the input buffer is cleared. . Download character definitions are cleared. . The printer’s settings areretumed to the defaults.

●

The

printer is set to the standby condition, if no fatal error occurs.

1.4.7.3

Softwme

Software

initialization is performed upon receipt of the control code ESC

Initialization

62.

When software

initialization is performed:

●

Print characters in the buffer are not cleared. . The printer setting is changed to the default, but download character definition is not cleared.

Rev. A

1-19

Page 29

Product Description

LQ-300

Service Manual

1.4.8 Printer Settings

1.4.8.1 Selectable Printer Settings

The following printer settings can be changed by users in default-setting mode: Character table (Standard):

Character table

(NLSP):

Page length:

l-inch skip-over-perforation: Auto tear off: Graphic print direction: Software AGM: Auto line feed:

Interface:

Bit rate (serial I/F):

Parity bit (serial I/F):

Data length (serial):

ETX/ACK

(serial):

State reply

Note:

Underlines show factory setting.

PC437/850/860/861

PC437/437 Greek/850 /852/853/855/857/864/866/869 IT

/1S0

8859-7/Code

/863/865

/BRASCII/Abicomp

MJK/Ma.zowia/Bulgaria

/1S0

Latin

11 /12/ 8.5/ 70/6 inches (A4)

on/Qff on/mf

Unidirectional / Bidirectional

ESC/P2

on/

/ IBM

Q.tl

X24E

on/Qf

Auto selection (10 second wait) / Auto selection (30 second wait)/ Parallel / Serial

300 / 600/ 1200/ 2400/ 4800/

!26Q!2

19200

bps None / Odd/ Even

7bits / 8 bits on/Qll

on/Qff

1.4.8.2 Changing the Default

Settings

You can change some parameters that the printer refers to at printer initialization.

1. To enter the default setting mode, turn on the printer while holding down the

Font

button,

The printer prints out the firmware version. Ifpaperisnot loaded, insert a sheet of paper.

2. The printer automatically loads paper and prints a table of languages to choose from: English, French, German, Italian, and Spanish. The

Font

lights indicate the currently selected language,

as shown in the table below.

Table 1-18. Font Lights and Language Selection

Font 2 Light

Blinks

OFF German

Blinks

3. Press the

Font

4. Press the Font

Font 1 Light

OFF OFF

ON ON ON

button to change the language, and press the

button

again after selecting a language. The printer prints help text to guide you in setting defaults. The printed instructions include submenu tables listing all the settings you can change and showing you how the control panel lights appear for each selection.

5. To change the settings, press the Font button to move down and press the move up in the menu of options shown below. The printer beeps once each time you press the these buttons while you are in this menu.

Language

English French

Italian

Spanish

LF/FF

button to select.

LF/FF

button to

<-’

1-20

., .,

Rev. A

Page 30

LQ-300 Service Manual

Table 1-19. Default Options

Product

Deacfiption

Font 1 Light Font 2 Light Pause Light

Blinks Blinks

OFF

Biinks Biinks

OFF

Biinks Biinks

OFF

Biinks Biinks Blinks

Blinks

you reach the setting you want to change, press the

When

OFF OFF

Blinks

Biinks

OFF

ON ON

Biinks

OFF

Biinks Blinks

Biinks

Biinks OFF

Setting

Character table Page

OFF

OFF OFF Auto tear-off

ON Blinks Blinks Bit rate

Blinks

State reply

iength

Skip over perforation

Graphic print direction Software

AGM

Auto line feed

interface

Parity bit

Data

iength

ETWACK

Pause

button once. The printer

Go to

Submenu

Tabie

Table 1-21

Tabie 1-22

Tabie Tabie 1-23 Tabie 1-24

Tabie Tabie

Table 1-25

Tabie

Table 1-27

Tabie 1-28 Tabie

Tabie

1-20

1-22

1-22 1-22

1-26

1-22

automatically enters the submenu for that setting.

Press the twice each time you press the

When the lights match your desired setting, press the Pause button to make your selection.

Font

button to move the through the settings in the submenu.

Font

button while in a submenu.

The

printer beeps

The printer saves the new setting and returns to the menu shown above. Repeat steps 5 through 8 for each additional setting you want to change, or skip to step 10 to

exit the printer’s default setting mode.

10.

When you are finished, turn the printer off. Any settings you have made remain in effect until you change them

again.

Font 1 Light

OFF

Blinks

Table 1-20. Character Tables

Font 2 Light Pause Light

OFF OFF

ON OFF OFF

ON ON

ON OFF Blinks OFF

Blinks Blinks Blinks Blinks Blinks Blinks

OFF OFF OFF Pc 860 OFF PC 863

ON ON

Blinks Blinks Blinks

Standard

437

PC 850

PC 865

Pc 861

BRASCII AbicomD

— — — — — — —

Modei

NLSP

Modei

437 Pc 650 PC 864

PC 437 Greek

Pc 652 PC 853 PC 855 PC 857 Pc 866 PC 869

iSO

Latin IT

ISO

8859-7

Code MJK

Mazowia

Bulgaria

Rev. A

1-21

Page 31

Product Description

LQ-300

Service Manual

Table 1-21. Page Length

Font 1 Light

OFF OFF

OFF

Font 2 Light Pause Light

OFF

ON ON

OFF OFF OFF

Setting

inches

12 inches

8.5 inches

i’0/6

inches

Table 1-22. Skip Over Perforation / Auto Tear Off/ AGM / Auto Line Feed/

ETWACK / State Reply

. . . .

..:.

. .

Font 1 Light

OFF OFF

Font 2 Light

Table 1-23. Graphic Print Direction

Font 1 Light

OFF

ON ON ON

Font 2 Light

OFF

Table 1-24. Software

Font 1 Light Font 2 Light

OFF

ON ON

OFF

Table 1-25. Interface

Font 1 Light

OFF

Font 2 Light

OFF

OFF OFF

ON ON

Table 1-26. Bit Rate

Pause Light

OFF off

ON On

Pause Light

OFF

Pause Light

OFF

Pause Light

OFF

OFF OFF Serial

Auto selection (10 ms wait) Auto selection (30 ms wait)

Setting

Uni-D

Bi-D

Setting

ESC/P2

IBM X24E

Setting

Parallel

gT’-

.,,.

Font 1 Light

OFF

ON ON

OFF

1-22 Rev. A

Font 2 Light Pause Light

OFF OFF

OFF 300 bps OFF 600 bps OFF OFF

ON ON ON

Setting

1200 bps 2400 bps 4800 bps 9600 bps

19200 bps

Page 32

LQ-300 Service Manual

Product Description

Table 1-27. Parity Bit

Font 1 Light Font 2 Light Pause Light

OFF

OFF OFF OFF OFF

OFF

Table 1-28. Data Length

Font 1 Light

OFF

ON ON

Font 2 Light Pause Light

OFF OFF

Setting

None

Even

Setting

7 bits

8 bits

Rev.

1-23

Page 33

Product Description

1.5 MAIN COMPONENTS

LQ-300

Service Manual

The main components of the components are:

■

C143

MAIN board: control board

■

C130 PSB/PSE

■

M-5M1O: Printer mechanism

■

Housing

(120 V/230 V) board:

1.5.1 C143 MAIN Board

The

C143

MAIN

PS-RAM,

SLA7022M (CR Motor Driver) /

PROM (Program /

4-2

SC5060

(PF Motor Driver)

board consists of the

EEPROM,

etc.

PSRAM256K

CG)

[

boll n

LQ-300

TMP90C041

designed for easy removal and repair. The main

power supply board

(CPU), an

TM P90C041 (CPU)

EEPROM

a a

E05B02(GA),

o o’/

program/CG

E05B02(GA)

6-STA475A (Printhead Driver)

UPC78M05AHF (Regulator

ROM, a

IC)

2-M51955B

(Reset

IC)

\ (Color Option)

C143

Figure 1-8.

1.5.2

The power supply boards are the same as those for the LX-300. The boards have two ratings for input AC voltages: transformer, switching +5 VDC and +35

C130 PSB/PSE

120 VAC

VDC

for the main board and printer mechanism.

Transformer

Board

FETs,

regulator

Switching FET

“n=.

MAIN Board Component Layout

(C130 PSB)

and 230 VAC

IC,

diode bridge, etc. The power supply board provides

❑

n nnnn

lu~uuul

(C130 PSE),

Diode Bridge

—1

l/--

Both boards consist of a

Power Switch

1-----

Figure 1-9.

1-24 Rev. A

C130 PSB/PSE

Reaulator

Board Component Layout

Page 34

LQ-300 Service Manual

1.5.3 Printer Mechanism (M-5M1O)

Product Description

The printer mechanism consists of 24-pin impact dot head, PF motor, RF motor, PE sensor,

sensor, PG sensor, release lever sensor, etc.

Figure 1-10. Printer Mechanism

1.5.4. Housing Assembly

This consists of printer cover assembly, edge guide assembly, upper housing, lower housing assembly, etc.

Edge Guide Assembly

Printer Cover Assembly

per Housing Assembly

Rev.

r Housing Assembly

Figure 1-11. Housing

Assembly

1-25

Page 35

;“+

,.. .

!:,

,,-,

’,,,..

Page 36

CHAPTER 2 Operating Principles

Table of Contents

2.1 PRINTER MECHANISM OPERATION

2.1.1 Printing Mechanism. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.1.2 Carriage Movement Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

2.1.3 Paper Handling Mechanism. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3

2.1.3.1 Paper Feed Mechanisms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3

2.1.3.2

2.1.4 Ribbon Advance Mechanism. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7

2.1.5 Ribbon Shift Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8

2.1.6 Platen GapAdjustment Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9

2.2 POWER SUPPLY OPERATION

2.2.1

Power Supply Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10

2.2.2 Power Supply Circuit Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.3 CONTROL CIRCUIT

2.3.1 Control

2.3.2

2.3.3

2.3.4

2.3.5

2.3.6

2.3.7

2.3.8

2.3.9

2.3.10 Interface Circuit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.3.11

2.3.12

2.3.13 Color Ribbon

2.3.14 Platen GapSensorCircuit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Power On Reset’Circuit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Power OffSensorCircuit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Home Position Sensor Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14

Paper End

Release Lever Position Sensor Circuit . . . . . . . . . . . . . . . . . . . . . . . . . 2-14

Carriage Paper Feed

Printhead

EEPROM CS

PaperAdvance

CircuitODeration

SensorCircuit

MotorDriveCircuit

Drive Circuit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-16

Control Circuit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-18

Motor Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-18

SensorCircuit

Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3

overvie w . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-16

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-19

2“1

2-1

2-1o

2-11

2-12

2-13

2-17

2-19

Page 37

List of Figures

Figure 2-1.

Printhead

Operation Principles . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2-1

Figure 2-2. Carriage Movement Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

Figure 2-3. Friction Advance Mechanism. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3

Figure 2-4. Push Tractor Paper Advance Mechanism . . . . . . . . . . . . . . . . . . . . 2-4

Figure 2-5. Pull Tractor Paper Advance Mechanism . . . . . . . . . . . . . . . . . . . . . 2-5

Figure 2-6. Push-Pull Tractor Paper Advance Mechanism. . ...............2-6

Figure 2-7. Paper Path. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. .2-6

Figure 2-8. Ribbon Advance Gear Linkage . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7

Figure 2-9. Color Shift Mechanism. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . z-g

Figure 2-10. Platen Gap Adjustment Mechanism. . . . . . . . . . . . . . . . . . . . . . . .

Figure 2-11.

Figure 2-12. Control Circuit Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 2-13. Power On Reset Circuit Diagram. . . . . . . . . . . . . . . . . . . . . . . . . Z-13

Figure 2-14. Figure 2-15.

Power

Supply

Circuit Block Diagram . . . . . . . . . . . . . . . . . . . . . . 2-11

Power Off Sensor Circuit Diagram. . . . . . . . . . . . . . . . . . . . . . . . Z-13

Home Position Sensor Circuit Diagram . . . . . . . . . . . . . . . . . . . . 2-14

Figure 2-16. Paper End Sensor Circuit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

z-g

2-12

2-14

Figure 2-17. Release Lever Position Sensor Circuit Diagram . . . . . . . . . . . . . . 2-14

Figure 2-18. Carriage Motor Driver Circuit Diagram . . . . . . . . . . . . . . . . . . . . .

Figure 2-19. Paper Feed Motor Driver Circuit Diagram . . . . . . . . . . . . . . . . . .

Figure 2-20.

Printhead

Figure 2-21. Parallel Interface

Figure 2-22. Serial Interface Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 2-23. EEPROM Control Circuit Diagram. . . . . . . . . . . . . . . . . . . . . . . .

Figure 2-24.

Figure 2-25. Color Ribbon Sensor Circuit Diagram . . . . . . . . . . . . . . . . . . . . .

Figure

2-26.

Platen Gap Sensor Circuit Diagram. . . . . . . . . . . . . . . . . . . . . . . 2-19

Driver Circuit Diagram . . . . . . . . . . . . . . . . . . . . . . . . . 2-17

Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . .

Motor Assembly Circuit Diagram . . . . . . . . . . . . . . . . . . . . . .

2-16

2-17

2-18

Z-18

2-19

2-15

[;?

,s. -.

List of Tables

Table 2-1. CR Motor Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

Table 2-2. PF Motor Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4

Table 2-3. Ribbon Advance Gear Linkage . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7

Table 2-4. CS Motor Specifications . . . . . . . . . . . . . . . . . . . . . .............2-8

Table 2-5. Coloring Sequences . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8

Table 2-6. Power Supply Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table 2-7. Power Supply Output Voltages and Applications . . . . . . . . . . . . . .

Table 2-8. Functions of the Main [C. . . . . . . . . . . . . . . . . . . . . . . . . . . . .....2-12

Table 2-9. Carriage Motor Drive Modes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15

2-10 2-10

Page 38

LQ400

Service Manual

2.1 PRINTER MECHANISM OPERATION

This

section

2.1.1 Printing Mechanism

describes the printer mechanism and explains how it works.

Operating Principles

The printing mechanism is composed of the is a 24pin head for impact dot printing. Each wire has own drive coil, which causes the wire to move in and out of the

driving wires work.

A drive signal transmitted from the control arcuit to the

1. the proper then causes the iron core to become magnetized.

The magnetic force draws the actuating plate toward the core, and the dot wire, which is

2. connected to the core, rushes toward the platen.

When the dot wire impacts the platen, pressing against the ribbon and paper, it prints a dot.

When the driving voltage stops energizing the coil, the magnetic force from the iron core vanishes. The actuating plate returns to its original position energized) with spring action. The dot wire also returns to its original position.

This is the sequence used to print a single dot. The mechanism is equipped with a built-in thermistor for head temperature detection. The

temperature detected by the thermistor is converted to an electric signal and fed back to the control circuit.

printhead

driving voltage, which energizes a corresponding coil. The energized coil

Wire Resettin S rin

to print each dot.

Stopper

prirdhead,

Dot Wire

ink ribbon, and ribbon mask.

The four steps below describe how these

printhead

drive arcuit is converted to

(the

position before coil was

The printhead

Yn7YY2

Actuating Spring

Figure 2-1.

Printhead Operation Principles

Rev.A

2-1

Page 39

Operating Principles

LQ-300

Service Manual

2.1.2 Carriage Movement Mechanism

The carriage movement mechanism consists of the carnage assembly, CR motor, timing belt, driven pulley, HP sensor, etc. The CR motor drives the the timing belt, which is moved by the CR motor. mechanism.

tirnkigbelt.

Figure 2-2 shows the carriage movement

The carnage assembly is connected to

The printer detects

determin”mg

position. The sensor is ON, when the carriage is pushed to the right or left. The striker on the carriage

the carriage home position.

actives

tie

carriage home position with the HI? sensor. This sensor is the basis for

The HP sensor informs the CPU of the carriage home

the sensor to indicate the carriage home position, which toggles the sensor to OFF.

Table 2-1. CR Motor Assembly Specifications

Type

Drive

Coil Resistance

Drive Pulse Frequency

Excitation Method

Category

Type 4-phase, 48-pole, PM-type stepping motor

Drive Voltage Coil Resistance Drive Pulse Excitation Method

Freauencv

35 VDC + 10%

150 Q * 5% (per phase, at 25° C or 77°

Color shift 500 DDS

Constant-voltage 2-2 phase excitation

The ribbon shift mechanism consists of the color ribbon and color upgrade kit. The color upgrade kit is composed of the

motor, ribbon

shift

gear/cam, motor driver The 1-inch-wide color ribbon is separated into four equal-width bands of different colors. The ribbon shift mechanism shifts the ribbon cartridge up and down.

When the color ribbon cartridge is loaded, it is possible to print in up to seven colors. One of the four colors on the ribbon is selected by the color ribbon the plastic posts into the slots in the printer mechanism as a fulcrum.

shift mechanism. The mechanism

shifts

the

ribbon cartridge by converting the gear rotation to

liner motion (up and down) of the color ribbon cartridge, using color shift cam gear.

Requirement

cartxidge

motion, which inserts a portion of

IC,

and color ribbon sensor.

Figure 2-9 illustrates the color

-’$

c’

. . . .

.;.

Any color band can be selected by rotation of the CS motor, using the color home position (the position of the black color band) as a starting point and reference position. Home position is

recognized by the

motor stepping pulse. When printer is powered on, the CS motor is first

exated at any phase position. Next, the CS motor is turned 235 steps ( black + yellow). Then, the

motor returns one step steps

(yellow+ black) and stops. This position is home position.

Table 2-5 gives coloring sequences.

(yellow+ black), and the motor is stopped. Finally, the motor returns 223

For halftones, as shown in the table, a color is created by

printing one color on top of another.

Table 2-5. Coloring Sequences

Print Ribbon

Print Color

First Printing Second Printing

—

— —

Cyan

Magenta

Cvan

Note:

Black Black

Magenta

Cyan Cyan

I Yellow

Green

Orange

Violet

The printer prints the brighter

wlor

Magenta

Yellow Yellow Yellow

l–l

Ma~enta I

first to prevent the ribbon from being stained,

,*,

‘

-c

2-8

Rev.A

Page 46

LQ-300

Service

Manual

Lever

Fulcrum Color Ribbon Cartridge

Black Cyan Magenta Yellow

Color Cartridge Holder

Operating Principiea

CS Motor Assembly

Color

CS Cam Gear

Shift

Cam

Pinion

Color Shift Cam Follower

Figure 2-9. Color Shift Mechanism

2.1.6 Platen Gap Adjustment Mechanism

The

platen gap (the gap between the platen and the printhead) can be adjusted to allow the printer

to use paper of different weights or thicknesses. When the gap adjust lever is moved forward or

badcward,

the platen and changes the platen gap.

the CR guide shaft rotates. This rotation moves the carriage either toward or away from

lhe

correct platen gap is 0.45 & 0.02 mm, with the gap

adjust lever set to position O.

Gap Adjust Lever Motion

Gap Adjust Lever

Rev.A

—..4

—..

Platen

‘\

CR Guide Shaft

Figure 2-10. Platen Gap Adjustment Mechanism

2-9

Page 47

Operating Principles

L(?-300

Service Manual

2.2 POWER SUPPLY OPERATION

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

C130 PSE

(230 V) power supply. These boards are the same as the LX-300’S power supplies. The

two boards function identically, except for a difference in primary circuitry. The power supply board outputs the DC current necessary to drive the printer control circuits and drive mechanism. Table 2-6 shows the input voltages and fuse ratings for these boards.

Table 2-6. Power Supply Board

C130 PSB

(120 V) or the

,’

‘%

Board

C130 PSB C130 PSE

Input Voltage

100.5-132

198-264

VAC

Fuse F1 Rating

2.5A 1125 V, 250 V

1.25 A 1250 V

2.2.1 Power Supply Overview

The power supply board has two power outputs for use in the various control circuits and drive mechanisms. Table 2-7 lists the circuitry and the units that are driven by the two DC output supply voltages.

Table 2-7. Power Supply Output Voltages and Applications

output supply

Voltage (DC)

+35 v (VP)

V (VL)

CR motor drivers PF motor drivers Printhead drivers CS motor drivers Main board assembly logic circuitry Various sensors Control panel LED PF motor/ CS motor hold

Applications

..;

..-

~.,

‘

2-10

Rev.A

Page 48

LQ-300 Service Manual

2.2.2 Power Supply Circuit Operation

Figure 2-11 shows a block diagram of the power supply circuitry. When AC power is supplied to the printer from an external power source, a filter

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

to the switching circuit. This feedback control arrangement ensures that the +35

kept stabilized. A +9

VDC

supply is created by putting the +35

cimuit.

This circuit further steps down the +35

VDC

output is stabilized to +5

There are several circuits to protect the supply

VDC

supply. A +35 V line voltage detector

VDC

using the regulator on the

cinmit

removes the noise. The AC voltage then

(ZD51

and

VDC

line through the +9

VDC

voltage and outputs a stabilized supply. The

C130

arcuits

and avoid danger.

Operating Principle

PC1)

circuit is connected

VDC

supply is

VDC

power supply

MAIN board assembly.

The +9 protection circuit It stops switching

The +35 protection circuit ( ZD52, It stops switching circuit operation, which stops the output from the +35

Full-Wave Rectification

Circuit

Filter Circuit

VDC

line contains a voltage overload protection circuit. The +9 V voltage overload

(ZD53, Q82, arcuit

VDC

line has a voltage overload protection circuit. The +35

Smoothing

—

Circuit

and

PC1)

cuts the supply if the voltage reaches or exceeds

operation, which stops the output from the +35

Q82,

and

PC1

) cuts the supply if the voltage reaches or exceeds +36

Switching Circuit

Smoothing Circuit

VDC

AC Line

-Ez!t

+11 VDC.

line.

voltage overload

line.

+35

VDC

-+9 VDC

(VL)

VDC.

(VP)

— Over-voltage

Figure 2-11. Power Supply Circuit

VDC

Line Over-voltage Protection Circuit

+35

VDC

Linel

Protection

Circuit

Block Diagram

Rev.A

2-11

Page 49

Operating Principles

2.3 CONTROL CIRCUIT

LQ-300 Service Manual

The control circuit consists of the C143 MAIN board assembly. This section

desuibes

the major

components and explains how the board works.

2.3.1 Control Circuit Operation Overview

The printer has a CPU

PS-RAM (256K-bit),

(TMP90C041)

a ROM (4 or

that runs at 9.8304 MHz, a gate array (E05B02-type), a

8M-bit),

etc. It oversees control of all the components in the printer. The printer uses the E05B02 gate array to control memory management, parallel communications, PF motor drive signals, etc. Table 2-8 shows functions of 2-12 shows the control circuits in

bl&k diagram form.

Table 2-8. Functions of the Main

CPU

EEPROM

R----R-

Location

ICI

IC2

IC3

Function

Receives data from the host computer and sends it to the input buffer in RAM (under interrupt processing control). Extends 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 drive circuit. Also controls various parts of the printer mechanism,

such as

Controls the functions below:

An electrically information as the TOF position and bidirectional adjustment value.

Driver / receiver Hardware reset function Power off detection Contains the program that runs the CPU and holds the character

design (also called the charaoter generator).

Input buffer

PF motor control and color select motor control.

● Input/Output Control

● Memory Management

. Bit Manipulation

● Interface Control

. Expanded Parallel Port

Printhead

● Motor Control

Control

writable

and erasable ROM used to hold such

ICS

and circuits. Figure

Printhead

-.,

,., .-

Panel

SWILED

Parallel l/F

Serial l/F

2-12

I Printhead

DRV.

Gate Array

&kiiEl

Figure 2-12. Control Circuit Block Diagram

Printhead

Sensor

EEPROM RESET

Color Ribbon Sensor

Temp.

Power Off Sensor

+35 V Sensor

PE Sensor

‘p”

4 Release Lever Sensor

. . .

Rev.A

Page 50

LWOO Service Manual Operating Principles

2.3.2 Power On Reset Circuit

When

the

power supply is turned on and immediately the VL (+9 V) goes up to +7.5 V (typical), the reset IC level signal from the reset

(IC6)

outputs the system RESET signal (LOW). The CPU and gate array receive this LOW

and reset themselves.

XRST

GATE ARRAY

(IC2)

(

)

(IC6)

Vcc

RESET

CPU

(ICI)

GND

Fgiure 2-13. Power On Reset Circuit Diagram

2.3.3 Power Off Sensor Circuit

When the power supply is turned off and the VP the reset IC from the reset IC and resets itself.

(IC7)

outputs the system

RFSETsignal

(+35V)

(LOW). The

Power Off Sensor IC

Vcc

+i’-

OUT

immediately goes down to

CPUreceives

(IC7)

this LOW

7+7

+25

V (typical),

Ievelsignal

Figure 2-14. Power Off Sensor Circuit Diagram

Rev.A

2-13

Page 51

Operating Principles

2.3.4 Home Position Sensor Circuit

This printer has a connector switch to sense the carriage home position. The CPU receives a signal from the HP sensor and recognizes the carriage home position when the printer is turned on. The

comector

the carriage is out of home position.

switch is open (OFF) when the carriage is in the home position and is closed (ON) when

+5 v

LQ-300

Service Manual

CPU (ICI)

P551AN5

Figure 2-15. Home Position Sensor Circuit Diagram

2.3.5

Paper End Sensor Circuit

This printer has a connector switch and no paper on the platen and is open (OFF) when paper is present.

comector

reco~es

CPU (ICI)

P52JAN2

switch for sensing the paper end. The CPU receives a signal from the

a paper end. The connector switch is closed (ON) when there is

. .

Home Position Sensor

)

“

PE Sensor

(..;

Figure 2-16. Paper End Sensor Circuit

2.3.6 Release Lever Position Sensor Circuit

This printer has a connector switch to detect the type of paper handling. The CPU receives a signal from the connector switch to indicate whether the paper is fed using friction or connector switch is closed (OFF) when friction feed is selected and is open (ON) when tractor feed is selected.

CPU (lCl)

Release Lever

P53/AN3

Position Sensor

hactor

feed. The

2-14

Figure 2-17. Release Lever Position Sensor Circuit Diagram

Rev.A

Page 52

L WOO Service Manual

2.3.7 Carriage Motor Driver Circuit

Operating Principles

Figure 2-18 shows the carriage motor driver circuit. The carriage motor driver uses an constant-current chopping drive arrangement. The motor is driven with 2-2 phase excitation and 1-2 phase excitation.

The MOO-3 (pins 3-6) on the CPU are used to control the phases of stepping motor. The carriage motor driver IC

current. The amount of current flowing in the coils varies, depending on the speed of the carriage

motor. The amount of the on the CPU.

Driver

3 x speed

2 X speed

3/2

1 X speed

3/4 x

1/2 x speed

GATE ARRAY

(IC8)

ODENO-1

Mode

speed

ODEN1 OPH1

ODENO

OPHO

detects the amount of current in

cument

and

OPHO-1

Table 2-9. Carriage Motor Drive Modes

Excitation Type

2-2 phase

2-2 phase 1600

2-2 phase

1-2 phase

1-2 phase 1-2 phase

is set by the gate array

on the CPU control the stepping motor.

Drive Frequency Type

2400

1200

1600

1200

800

+5V +5V

IC2)

the

carnage motor

(IC2).

PPS PPS

pps

ppS

pps

PPS

CR Motor Driver IC (

OA O-A 00 o-B

Signals are sent to the

Draft Mode Draft Copy Mode Bit Image Mode

LQ Mode LQ LQ

coils

and regulates the

Standard Print Character

Copy Mode Speed Down Mode

;8)

. 10

open-Ioop,

ODO-0D2

CR MOTOR

CRA

CR_A

CRB

CR_B

OD2 OD1 ODO

46 72 B2

‘IIIJ

Figure 2-18. Carriage Motor Driver Circuit Diagram

CRCOM

Rev.A

2-15

Page 53

Operating Principles

2.3.8 Paper Feed Motor Driver Circuit

Figure 2-19 shows the paper feed motor driver circuit, an open-loop, constant-voltage drive with 1-2 phase excitation.

The ports (pins 7-lo) on the CPU are used to control the stepping motor. The pulse signal from the

IC1

controls four 600, 1000, 1200, and 1300 pps, to correspond to the idling voltage, the paper handling condition, and the volume of paper feeding.

PFCOM

voltage is changed VX

tmmsistors

and the stepping motor. The motor is driven at six speeds, 300,500,

The

CPU controls motor driving speed. At the holding time, the

(+35

V) into VL (+5 V) via Q1

and

Q6 by the gate array.

LC&300

Service Manual

Gate Array

143

CPU (ICI)

Figure 2-19. Paper Feed Motor Driver Circuit Diagram

2.3.9

Figure 2-20 shows the image Port sampling the +35 possible to maintain the energy supplied to +35 V line is HIGH, ICI lengthens the output pulse.

Printhead Driver Circuit

printhead

data

is split by the

AN6

(pin 66) of

VDC

CPU

and transferred to the

IC1

samples

line voltage and deterrninin

ICI

shortens

Gate Array

DATA

BUS

driver

circuit block diagram. Print data, already expanded into

the

voltage of the +35

the

output

puke.

●

-vW-

●

PF Motor Drive Transistors

!37

M13

M12

139

Mll

140

MIO

==%

+5V

latch

g the length of the head drive signal, it is

the

head at a constant level. If the voltage from the

If the voltage from

QM1 -6

Q2 Q3

Q4 Q5

A4 &

k---wTpFcOM

‘

circuit in the gate array in the system.

VDC line

●

PF-~

PF_A

PF~

P FA

via the A/D converter. By

the

+35

VDC

line is LOW,

●

● :

●

#24

., .

--h

,-,,

‘

2-16

ANI

Figure 2-20.

+5 v VP

-1-

Printhead

Driver Circuit Diagram

Rev.A

Page 54

LQ-300 Service Manual

Operating Principles

2.3.10 Interface Circuit

Figure 2-21 shows the parallel interface arcuit block diagram. Data from the host computer is latched within the gate array by STROBE signal. The gate array outputs XBUSY signal automatically to stop the host computer from sending further data. The gate array reads the data latched periodically with generating an interrupt.

The parallel I/F conforms to bidirectional parallel I/F

Parallel l/F

127-134

IEEE-P1284

Gate

Array

DINO-7

-----: XSTROB

12 14 15

;

XB”SY

----

‘

------ XPE

------ XERR

------ XSLCT

---”-

‘

level 1 nibble mode.

XSLIN

Figure 2-21. Parallel Interface Block Diagram

Fim.ue

2-22 shows

E&232D. RXD

driver/receiver when a CR code is received or when the input buffer is filled.

the serial

interface circuit block diagram. The serial interface conforms to

is data received by the serial 1/0 of th~CPU block from the host computer via

IC4.

Data is transmitted to an input buffer in

IC1l

(IC2)

from the CPU. Printing starts

Serial

TXD DTR

RXD

CTS

RST

+5V

IIF

4 4

Driver/Receiver

(IC4)

D1OUT

D20UT

RIIN

R21N

DIIN

D21N

R1OUT

R20UT

52 50

CPU (lCl)

P33

P32

P30 P34

Figure 2-22. Serial Interface Block Diagram

Rev.A

2-17

Page 55

Operating Principles

2.3.11 EEPROM Control Circuit

LQ-300

Service Manual

Figure 2-23 shows the information as the top-of-form position. The not lost if the printer is powered off. Since the converts 8-bit data into serial data.

EEPROM

CPU (lCl)

control circuit block diagram. The

EEPROM

is non-volatile memory, so information is

EEPROM

is a serial I/O-type device, the CPU

EEPROM (IC3)

EEPROM (IC6)

contains such

05 06

::5

‘

’

Vcc

GND

}

)

+’7-

Figure 2-23.

2.3.12 CS Motor Circuit

Figure 2-24 shows a block diagram of the CS motor circuit in the optional color upgrade kit. The CS motor is a permanent magnet (PM) stepping motor, driven with 2-2 phase proportion to the desired rotational speed. This motor can be rotated in either direction and stopped at any position. Four phase signals are directly output from the system through a

tcansistorarray.

The drive voltage is constant (i.e., +35

EEPROM

Control Circuit Diagram

VDC

from the VP line).

exatation IC

and pass

Source Voltage Current Consumption

GATE ARRAY

35 VDc * 10 245

(IC2)

MT3

MT2

MT1

MTO

( peak)

?40

MOTOR

CS-B CS-A CS

CS A

I=%z

CS-HOLD

Printer

Figure 2-24. CS

Motor Circuit

Color Upgrade Kit

2-18

. .-

Rev.A

Page 56

LQ-300 Service Manual

Operating

PrinciMes

2.3.13 Color Ribbon Sensor Circuit

The printer’s color ribbon circuitry is shown in the figure below. The CPU receives signals (HIGH

or LOW) from the mechanical switch. The signal is HIGH (ON) when a color ribbon is installed and is LOW (OFF) otherwise.

CPU (Cl)

P31

Printer

Figure 2-25. Color Ribbon

2.3.14 Platen Gap

This printer has a connector switch to sense the receives a signal from the

switch is

close(ON)

decrease in copy mode.

open(OFF)

when the printer is in normal

Sensor Circuit

sensor and recognizes the PG adjust lever position. The comector

when the printer is in copy

mode(PG

adjust lever position:-l-+l). The printing speed

]

Color

I I

;

Color Upgrade Kit

Sensor Circuit Diagram

PG(Platen

mode(PG

Ribbon

Gap) adjust lever position. The CPU

adjust lever position:2-6) and is

Sensor

+5V

CPU (ICI)

P54

Figure 2-26. Platen Gap Sensor Circuit Diagram

Rev.A 2-19

Page 57

CHAPTER 3 Disassembly and Assembly

Table of Contents

3.1 OVERVIEW

3.1.1 Disassembly Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.1.2 Tools . . . . . . . . . . . . . . . . . . . . . . . .

. . . . - - .”.-...””

““”.””””””””

3-1

3.1.3 Service ChecksAfterRepair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

3.1.4 Specifications

forScreWs. . . . . . . . . . . . . . . .. ... ...

3.2 DISASSEMBLY AND ASSEMBLY

3.2.1 Removing the Printhead . . . . . . . . . . . . . . . . . ........””””-””.

...”O”” ....”.”

3-3

3-4

““.” 3-5

3.2.2 Removing the Upper Housing Assembly. . . . . . . . . . . . . . . . . . . . . . . . . 3-6

3.2.3

3.2.2.1

Removingthe MAIN and

Removinq

the

Eject

Roller Assembly

“.””” .s

PSB/PSE BoardAssembfies

s””””””” o

-”” -”

3-6

—

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

3.2.3.1 Removing the MAIN Board Assembly. . . . . . . . . . . . . . . . . . . . . 3-8

PSB/PSE Board Assembly. . . . . . . . . . . . . . . . . . 3-8

Motor

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

3-10

3-11

.””. “ -.. “ 3-12

3-13 3-14

3-14

3-15

3-16

3-17

3-18 $19

3-20

3.2.4

3.2.5

3.2.6

3.2.7

3.2.3.2 Removing the

Removing the Printer Mechanism . . . . . . . . . . . . . . . . . . . . . . “ . . . “ “ “ - 3-9

3.2.4.1 Removing the

3.2.4.2 Removing the CR Motor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.2.4.3 Removing the Platen. . . . . . . . . . . . . . . . . . . . . . . .

3.2.4.4 Removing the PE Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.2.4.5 Removing the HP Sensor. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.2.4.6 Removing the Release Lever Position Sensor . . . . . . . . . . . . .

3.2.4.7 Removing the Carriage Assembly. . . . . . . . . . . . . . . . . . . . . . .

3.2.4.8 Removing the Ribbon Drive Gear Assembly. . . . . . . . . . . . . . .

3.2.4.9 Removing the PG Sensor. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Removing the Interface Board Assembly. . . . . . . . . . . . . . . . . . . . . . . .

Removing the Driven Roller Assembly . . . . . . . . . . . . . . . . . . . . . . . . .

Disassembling and Assembling the Color Upgrade Kit. . . . . . . . . . . . .

3.2.7.1 Removing the Ribbon Motor Assembly. . . . . . . . . . . . . . . . . . .

3.2.7.2 Removing the CS Cam. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . “

3.2.7.3 Removing the Color Sensor Assembly. . . . . . . . . . . . . . . . . . .

Page 58

CHAPTER 3 Disassembly and Assembly

Table of Contents

3.1 OVERVIEW

3.1.1 Disassembly Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.1.2

ToOIS

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

3.1.3 Service ChecksAfterRepair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

3.1.4

Specificationsfor

3.2 DISASSEMBLY

Screws. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3

AND ASSEMBLY

3.2.1 Removing the Printhead . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5

3.2.2

Removing the Upper Housing Assembly. . . . . . . . . . . . . . . . . . . . . . . . . 3-6

3.2.2.1 Removing the Eject Roller Assembly . . . . . . . . . . . . . . . . . . . . . 3-6

3.2.3

3.2.4

Removing the MAIN and

3.2.3.1 Removing the

3.2.3.2 Removing the

Removing the Printer Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9

PSB/PSE Board Assemblies. . . . . . . . . . . . . . 3-7

MAIN

Board Assembly. . . . . . . . . . . . . . . . . . . . . 3-8

PSB/PSE Board Assembly. . . . . . . . . . . . . . . . . . 3-8

3.2.4.1 Removing the PF Motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.2.4.2 Removing the CR Motor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.2.4.3 Removing the Platen. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12

3.2.4.4 Removing the

3.2.4.5 Removing the HP Sensor. ., . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14

PE Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.2.4.6 Removing the Release Lever Position Sensor . . . . . . . . . . . . . 3-14

3.2.4.7 Removing the Carriage Assembly. . . . . . . . . . . . . . . . . . . . . . . 3-15

3.2.4.8 Removing the Ribbon Drive Gear Assembly. . . . . . . . . . . . . . . 3-16

3.2.4.9 Removing the PG Sensor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-17

3.2.5

3.2.6

3.2.7

Removing the Interface Board Assembly. . . . . . . . . . . . . . . . . . . . . . . . 3-18

Removing the Driven Roller Assembly . . . . . . . . . . . . . . . . . . . . . . . . .

Disassembling and Assembling the Color Upgrade Kit. . . . . . . . . . . . . 3-20

3.2.7.1 Removing the Ribbon Motor Assembly. . . . . . . . . . . . . . . . . . . 3-20

3.2.7.2 Removing the CS Cam. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.2.7.3 Removing the Color Sensor Assembly. . . . . . . . . . . . . . . . . . . 3-20

3-1

3-4

3-10 3-11

3-13

3-19

3-20

Page 59

LQ-300 Service Manual

3.1 OVERVIEW

Disassembly and Assembly

This section describes various points to

note when

disassembling and assembling the printer.

3.1.1 Disassembly Precautions

Follow the precautions below when disassembling the printer.

Before disassembling, assembling, or adjusting the printer, disconnect the power

cablefiom

To maintain

●

Use

●

Use only the recommended

Adjust the

3.1.2

the

power socket. Failure to do so

efi”cient

printer operation:

can

cause personal

only the recommended tools for maintenance work.

Tools

pn”nter

lubn”cants

only in the manner described in this manual.

and adhesives

(see

Chapter

injuy.

6).

supply

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

Table 3-1. Recommended Tools

Note:

Tool

Round-nose pliers Nippers Tweezers Soldering iron E-ring holder #2.5 Phillips screwdriver No.2 Normal screwdriver Thickness gauge

All tools are commercially available.

Table 3-2. Equipment Required for Maintenance

Description

Multimeter

Oscilloscope

oscilloswpe

is required only for servicers who repair to the component level.

Specification

MHz

Part No.

6740400100 B7405OO1OO 6741000100 B7402OO1OO 6740800400 6743800200 6743000100 6776702201

Rev.A

3-1

Page 60

Disassembly and Assembly

LQ-300 Service Manual

3.1.3 Service Checks After Repair

Before returning the printer after service, use the checklist in Table 3-3, which provides a record to

make servicing and shipping more effiaent.

Table 3-3. Inspection Check list for Repaired Printer

Category Component

Printer units

Adjustment Printhead Is the platen gap adjusted correctly?

System ROM ROM version upgrade

Printhead Are any wires broken?

Are any wires worn out?

Carriage Does the

❑

mechanism

Paper advance mechanism

Paper path Is the

Ribbon Is the ribbon mask free of distortion? mask

Self-print test

On-line test Was the on-line test successful?

printing

Default Have user-ohangeable settings been setting

version

Shipment

Movement noisy Q Mechanism dirty

❑

Mechanism oily

Is the CR motor at the

oorrect temperature (not overheating)

Is paper advancing smoothly?

❑

Movement

❑

Mechanism

Is the

at the correct temperature (not overheating)

feeding smoothly?

Is the tractor feeding the paper

correctly?

Is the paper path clear of all

obstructions?

Is the platen

Was the self-print successful?

Is the bidirectional print position

adjusted

reset to the default value?

Has the ribbon been removed? Have all relevant parts been included

in the shipment?

Item to

oarriage move smoothly?

paper

advanoe

&oe

of paper in the printer

free of damage?

oorreotly?

Check

noisya

oily

Mechanism dirty

motor running

Is Check Required?

❑

Checked ❑ Not necessary

❑ Checkeda Not ❑ Checked D Not

neoessary neoessary

❑ Checked UNot necessary ❑ Checkedn Not

❑

Checked ❑ Not

❑

Checked ❑ Not

❑ Checkedn Not ❑

Checked ❑ Not

❑

Checked ❑ Not

neoessary

neoessaty

❑ Checkedn Not necessary ❑

Checked ❑ Not necessary

❑

Checked ❑ Not necessary

❑

Checked ❑ Not necessary

❑

Checked D Not necessary

❑

Checked ❑ Not necessary

❑

Checked ❑ Not necessary

❑

Checked ❑ Not necessary

❑

Checked ❑ Not necessary

3-2

Rev.A

Page 61

LQ-300 Service Manual

3.1.4 Specifications for Screws

Disassembly and Assembly

Table 3-4 lists the abbreviations used in the following sections for small parts, such as

screws

washers.

Table 3-4. Screw Abbreviations

Abbreviation Part

CPB Cross-recessed pan head B-tight screw

CBB

CBS Cross-recessed bind head S-tight screw

CBC

CB(0) Cross-recessed bind head with outside toothed lock washer

CFP Cross-recessed flat head P-tight screw

Cross-recessed pan

Cross-recessed bind head B-tight screw

Cross-recessed bind head

head screw

C-Lamitite

Name

screw

and

Rev.A

3-3

Page 62

Disassembly and Assembly

LQ+?O Service Manual

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 is simply the reverse of the procedure for removing the component, no description of the installation is given. Any points of special concern follow the description of the procedure.

●

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

Disassembly includes the following seven procedures:

Removing the printhead.

Removing the upper housing assembly.

Removing the MAIN and

Removing the printer mechanism. Removing the interface board assembly.

5. Disassembling the driven roller assembly.

Disassembling the color upgrade kit

PSB/PSE

board assemblies.

Refer to the diagrams in the appendix to see how components fit together.

rt”bbon.

,’

START

Unplug the power cable and the interface cable from h

3.2.2.1 Rem-wing the Upper Housing Assembly

Removing the MAIN and

prfntart

PSB/

PSE

Boerd

3-9

!echsnism

3.2.4.1 Removing the PF Motor

3.2.4.3 Removing the Platen

3.2.4.5

Removmg

the Carnage Assembly

Assemblies

13-12

Removing the Driven Roller

Rerswing

the

Ejecl

Removirw the CR Motor

Renwma

the PE Sensor

Removing the Release Lever Position Sensor

3.2.4.8

Rernowng

the

Rtbb@

Roller

AexmMy

Drive Gear

Aawmbly

] 3-16

Aaeembly

3.2.4.9 Removing

3.2.5

Removing the Interface Board Assembly

I 3-18

Figure 3-1. Procedure for Disassembling the Printer

3-4

the

PG Sensor

3-17

Rev.A

Page 63

LQ-300 Service Manual

Disassembly and Assembly

3.2.1 Removing the

Remove the printer cover assembly, edge guide assembly, ribbon cartridge, tractor assembly,

Printhead

platen knob, and color upgrade kit.

2. Remove

3. Remove the

4. Remove the head cables

the

CPB (M3 x 14) screw attaching the

printhead.

(FFCS)

from the

printhead.

Printhead

printhead

to the carnage assembly.

Fgiure

3-2. Removing the Printhead

Rev.A

3-5

Page 64

Disassembly and Assembly

LQ-300 Service Manual

3.2.2 Removing the Upper Housing Assembly

1. Remove the printer cover assembly, edge guide assembly, ribbon cartridge, tractor assembly, platen knob, and optional color upgrade kit.

2. Remove 4 assembly.

3. Lift off the upper housing assembly.

CPB (M4

12) screws

attaching the upper housing assembly to the lower housing

Upper Housing Assembly

Housing Assembly

Figure 3-3. Removing the Upper Housing Assembly

3.2.2.1 Removing the Eject

Remove the upper housing assembly ( see Section 3.221).

2. Lift the eject roller assembly up and atan angle from theupperhousing assembly.

Note:

User care

when removing the eject

Roller Assembly

ro//erassemb/y,

or the 500 g spring may pop out.

500g Spring

Upper Housing Assembly

Eject Roller Assembly

‘N

3-6

Figure 3-4. Removing the Eject Roller Assembly

Rev.A

Page 65

LC?-300

Service Manual

Disassembly and Assembly

3.2.3 Removing the MAIN and

Remove the printer cover assembly, edge guide assembly, ribbon cartridge, tractor assembly,

PSB/PSE

Board Assemblies

platen knob, and optional color upgrade kit. Remove the upper housing assembly (see Section 3.2.2).

Disconnect 4 flexible flat cables

(FFCS)

and 7 connectors from the MAIN and

PSB/PSE

board

assemblies.

Remove 4 assemblies, the

CBB (M3

x 8) screws attaching the shield plate to the MAIN and

x 8) screw attaching the CS board, and the

PSB/PSE

CB(0) (M4

board

x 8) screw

attaching the ground wire of the power cable. Disengage the shield plate and W and

PSB/PSE

board assemblies from the grounding

plate.

CBB(M3X8)

PSB/PSE

Board

Shield Plate

AssemblY

M4x8)

CBB(

Grounding Plate

Figure 3-5. Removing

the Shield Plate

round

Wire

er Cable

Rev.A

3-7

Page 66

Disassembly and Assembly

LQ-300 Service Manual

3.2.3.1

1. Remove the

2. Remove the

Removing the

PSB/PSEboard

CBC

(M3x8)screwand the3CBUSCAC

MAIN Board Assembly

assembly

FFC fromconnector CN20fthe

(M3

MAIN board assembly.

x8).

3. Remove the MAIN board assembly.

3.2.3.2 Removing the

Remove the

FFC

PSB/PSE

for the

PSB/F’SE

Board Assembly

board assembly from connector CN2 on the MAIN board

assembly.

2. Remove he CB

3. Remove the

●

When replacing the MAIN board assembly, bend the LED lead wires parallel to the MAIN

board assembly

●

The shield plate is easily bent; be

MAW

and

CBUSCA

USCA

(M3

PSB/PSEboard

(see

Figure 3-7).

PSBIPSE

board assemblies.

C(M3X1O)

x 10) screw and 2 CB assembly.

carefil

when tightening the screws that attach it to the

CBUSCA C(M3X8)

USCA

(M3

x 8) screws.

CBUSCA C(M3X8)

CBC(M3X8)

\f\/’#J@?y

FFc shield

,1,

Plate

<’

PSB/PSE Board Assembly

~~Q

MAIN Board Assembly

Figure 3-6. Removing MAIN and PSB/PSE Board Assemblies

CBUSCAC(M3X8)

~’

3-8

MAIN Board Assembly

Figure 3-7. Bending the LED Lead Wires

Rev.A

Page 67

LQ-300 Service Manual

Disassembly and Assembly

3.2.4 Removing the Printer Mechanism

Remove

tie Pfiter cover

assemblies, edge guide assemblies, ribbon cartridge, tractor

assemblies, platen knob, and optional color upgrade kit.

Remove the upper housing assembly (see Section 3.2.2). Remove the connectors and

Remove the 3 lower housing shafts (1018296). Remove the other lower housing shaft (1015457). (Note that this shaft is different from the

FFCS

from the MAIN board assembly.

three described in the previous step.) Remove the printer mechanism.

Lower Housing Shaft (1015457)

Lower Housing Assembly

Lower Housing

Shaft

(101 8296)

Rev.A

Figure 3-8. Removing the Printer Mechanism

3-9

Page 68

Disassembly and Assembly

LQ-300 Service Manual

3.2.4.1 Removing the PF Motor

1. Remove the printer mechanism (see Section 3.2.4).

2. Remove the platen grounding spring

3. Remove the CBB (M3 x8) screw attaching the

thatsecures theplatenshaft

PFmotorto the

nghtframe.

(see Section 3.2.4.3).

4. Release the clip holding the PF motor assembly from the right frame.

5. Remove the PF motor from the right frame.

Figure 3-9. Removing the PF Motor

Motor “

3-1o

Rev.A

Page 69

LQ-300 Service Manual

Disassembly and Assembly

3.2.4.2

Removing the CR Motor

Remove the printer mechanism (see Section 3.2.4).

2. Remove the extension spring from the hook on the CR motor and the hook on the base frame.

3. Remove the timing belt from the pulley drive.

4. Remove the E-ring, pulley washer, belt pulley flange, and pulley drive from the CR motor.

5. Rotate the CR motor counterclockwise and remove it.

Timing Belt

Extension Spring

Right Frame

Figure 3-10. Removing the CR Motor

Rev.A

3-11

Page 70

Disassembly and Assembly

3.2.4.3 Removing the Platen

1. Remove the printer mechanism (see Section 3.2.4).

2. Remove the platen

3. Remove the 25 mm gear from the right frame.

4. Disengage the teeth of the 211 mm bushings and rotate them.

5. Rotate the platen and

fir

i’-’~

gmundingspring

&move

lrnm

Busing

that secures the platen shaft.

it.

Platen

‘@(!!?=-”mmGear

-++(I

Am’

LQ+OO

Service Manual

piaten Grounding

Spring

Right ‘Frame

Figure 3-11. Removing the Platen

25mrn Gear

3-12

Rev.A

Page 71

LQ-300 Service Manual

Disassembly and Assembly

3.2.4.4

3. Release the friction shaft of theupperpaper Wide from the clips on the right and left frame.

4. Remove the upper paper guide from the right and left frame.

Removing the PE Sensor

Remove the printer mechanism (see Section

Remove the platen (see Section3.2.4.3)-

3.2.4).

~J.:,,pD’ve::e:::ier.uide

14.2g Compression

Spring

Left Frame

a~q

Ct,

&’&

‘i L

‘\

PE Sensor

Friction Shaft

~~~-~gcompression

Figure 3-12. Removing the PE Sensor

Release the 2 clips securing the PE sensor and remove it.

PE Sensor

Upper Paper Guide

Figure 3-13. Wiring of the PE Harness

Frame

mess

Rev.A

3-13

Page 72

Disassembly and Assembly

LG?-300

Service Manual

3.2.4.5

2. Release the 2 clips attaching the HP sensor and remove it. The clips

Removing the HP Sensor

Remove theprinter mechanism (see Section 3.2.4).

can

be accessed though 2

holes in the base frame. To release the clips, push each with a pair of tweezers.

Base

Figure 3-14. Removing the HP Sensor

3.2.4.6 Removing the Release

1. Remove the

2. Release the 2 clips that attach the release lever position sensor to the frame of the assembly.

3. Remove the release lever position sensor from the frame of the PFmotor assembly.

PFmotor

assembly (see Section 3.2.4.1).

Lever Position Sensor

Frame of the

PF Motor

Release Lever

Position Sensor

Clip

motor

3-14

Figure 3-15. Removing the Release Lever Position Sensor

Rev.A

Page 73

LQ-300 Service Manual

3.2.4.7 Removing the Carriage Assembly

Remove the printer mechanism (see Section 3.2.4).

2. Remove the belt tension spring from the hook on the CR motor (see Section 3.2.4.2), and remove the carriage assembly timing belt from the drive pulley.

3. Release the hook that attaches the head cable sheet to the base frame. Slide the cable to the left and remove it.

4. Remove the printhead

5. Remove the CR shaft grounding plate from the left side of the printer mechanism.

6. Rotate both sides of the parallelism adjustment bushing and remove them from the left and right frame.

7. Remove the CR guide shaft assembly and the carriage assembly.

FFC

from the base frame.

Disassembly and Assembly

CR S

Paralleli

Adjustm

,ase,rame

-’y2y!//Righ’Frame

Cable Head

Figure 3-16. Removing the Carriage Assembly

Rev.A

3-15

Page 74

Disassembly and AssemblY

LQ-300 Service Manual

3.2.4.8

1. Remove the printer mechanism (see Section 3.2.4).

2. Release the 3 hooks attaching the ribbon drive

3. Remove the RDcover.

4. Remove the belt tension spring between the hook on the CR motor assembly and the hook on

5. Remove the timing belt from the driven pulley.

Removing the Ribbon Drive Gear Assembly

(RD)

cover to the left frame.

the base frame (see Section 3.2.4.2).

Make sure not to put the timing belt between the RD cover and the

Ratchet

RDCover,,o

“No

Ribbon Planetary

Gear

Shafi 5.1 ,16.2mm

Combination

G“

Plane Washer>

Spring

Gear

Washer”

~2.3m\<17mjn,f3eH

“e.

.WL

leftj%ame.

pulley

Washer

Belt Pulley Flange Pulley

Driven Shaft Pulley

1,.zmm Gear

Driven

‘d

““’mmGear’

‘ Left Frame

‘:

“%5116.2mm

C“ornbination

Gear

~$<”

Base Frame

‘o&

J’

:h:\

‘:’y-&

Figure 3-17. Removing the Ribbon Drive Gear Assembly

3-16

Rev.A

Page 75

LQ-300 Service Manual

Disassembly and Assembly

3.2.4.9 Removing the PG Sensor

Remove the printer mechanism (see Section 3.2.4).

2. Release the 2 clips attaching the PG sensor and remove it. The clips can be accessed through 2

holes in the left frame; to release the clips, push each with a pair of tweezers.

Sensor

Left Frame

Figure 3-18. Removing the PG Sensor

Rev.A

3-17

Page 76

Disassembly and Assembly

LWOO Service Manual

3.2.5 Removing the Interface Board Assembly

1. Remove theprinter mechanism (see Section 3.2.4).

2. Remove the grounding plate connecting the interface shield plate and theshieldplate.

3. Remove the the lower housing assembly.

4. Remove assembly.

5. Remove the bottom cover and the interface board assembly.

the

CBB (M3

x 8) screw and the

x 8)

SCreWS attaching

CBB (M3

the

x 10) screw attaching the bottom cover to

interface board assembly to the lower housing

l/F

Board Assembly

Grounding Plate

Lower Housing Assembly

Figure 3-19. Removing the Interface Board Assembly

3-18

Rev.A

Page 77

LQ-300 Service Manual

3.2.6 Removing the Driven Roller Assembly

Remove the printer cover.

2. Remove the

3. Remove the driven roller assembly.

Driven Roller

CFP (M2.6

x 8) screw attaching the driven

CFP(M2.6X8)

roller

Disassembly and Assembly

assembly.

73g Spring

1“

Driven Roller Holder /

Ta/A

“ven’o’’ercover

Figure 3-20. Removing the Driven Roller Assembly

“h

\Kf..w

pfinter~er

Rev.A

3-19

Page 78

Disassembly and Assembly

LQ-300 Service Manual

3.2.7 Disassembling and Assembling the Color Upgrade Kit

3.2.7.1 Removing the Ribbon Motor Assembly

1. Remove

the

CBB

(h43

x 8) screws attaching the ribbon motor assembly to the CS cover.

2. Release the 2 clips attached to the CS cover.

3. Remove the ribbon motor assembly along with the CS board assembly from the CScover.

3.2.7.2 Remove the CS Cam

1. Remove theribbonmotor assembly (see Section 3.2.7.1).

2. Remove the E-ring3 from the CS frame shaft.

3. Remove the CS cam

3.2.7.3 Removing the Color Sensor Assembly

1. Remove the ribbon motor assembly andthe

2. Remove the 4rnm

E-ringfrom

thecartridge holder shaft.

3. Remove the color cartridge holder from the ribbon motor assembly.

4. Release the clip that attaches the color cartridge holder to

5. Remove the connector of thecolorsensor assembly fromthe

CS Cover

-1 /

CSboardassembly

Board Assembly

(see Section 3.2.7.1).

tie

color sensor assembly.

CSboardassembly.

‘“p

CBS(M3X6)

3mm E-ring

Cam

Color Cartridge Holder

Figure 3-21. Disassembling the Color Upgrade Kit

CS Lever

3-20

Rev.A

Page 79

CHAPTER

4 Adjustments

Table of Contents

4.1 ADJUSTING THE PRINTER MECHANISM

4.1.1 Platen Gap Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4.2 DEFAULTS, MACHINE INFORMATION BIDIRECTIONAL ADJUSTMENT

4.2’.1 Default Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2

4.2.2 Bidirectional Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SEITINGS,

AND

List of Figures

Figure 4-1. The Flowchart of the Platen Gap Adjustment . . . . . . . . . . . . . . . . . 4-1

Figure 4-2.

The Bidirectional Pattern Print. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4-1

4-2

A-A

4-4

Page 80

LQ-300 Service Manual

Adjustments

4.1 ADJUSTING THE PRINTER MECHANISM

This section describes the adjustments you may need to make to the printer mechanism.

4.1.1 Platen Gap Adjustment If

you have rotated or reassembled the CR guide shaft assembly or the parallelism adjustment

bushing, or if printing is abnormal, you must adjust the platen and the

Set the release lever to the friction position.

Remove the upper housing assembly (see Section 3.2.1).

Set the gap adjustment lever to O.

Remove the

Remove the ribbon mask with a pair of tweezers.

Install the

Adjust the platen gap using the flowchart below. The correct platen gap is 0.455 mm

0.015 mm. When measuring the gap, take care to let the gauge fall between the platen and the

printhead

toward the platen using a screwdriver. To reduce the platen gap, turn the parallelism adjustment bushing away from the platen.

printhead.

by gravity only. To

inmease

the platen gap, turn the parallelism adjustment bushing

printhead.

START

YES

gap correct on the

right

YES

the

platen

side?

‘c

L+

Adjust the platen

Adjust the platen gap on the right

side.

Is the

platen

gap correct on the

left side?

YES

Rev.A

Figure 4-1. Flowchart for Platen Gap Adjustment

4-1

Page 81

Adjustments

LQ-300 Service Manual

4.2 DEFAULTS, MACHINE INFORMATION SEITINGS, AND

BIDIRECTIONAL ADJUSTMENT

4.2.1 Defaults and Machine Information Settings

Perform the procedure below when the main board assembly is replaced.

Connect the printer to a PC.

Turn the printer on.

Load paper into the printer by pressing the continuous paper.

Load the Insert a diskette containing the

Load the When you run the program, the following message appears on the display:

GWBASIC

LQ-300

Adjustment

program onto the PC.

LQ-300

Adjustment Program into the PC’s diskette drive.

Program’’BKMENLJ.BAS”.

LF/FF

button. You can use either cut sheet or

LQ-300

Adjustment Program

EAI, EAI EDG,

(Latin A), EIS, EIB, EUL, ESP, EHK

EFS

EDG (NLSP) El-l-

5. END Do nut input unspecified destination! Please input each destination No.( 1-4 ) and

not input unspecific destination data!

Press 1-4, then go to adjustment program of each destination

9. The following message appears on the display:

LQ-300

Adjustment Program

Enter

1. Bi-DAdjustment

2. Defaults& Machine Information Settings

3. END

If ready, press 1-3 and the

Enter key. -

Key.

10. The following message

appears on the display:

If you press the Y key, all data stored in the EEPROM on the main board will be initialized to

the factory default settings. Before proceeding, confirm the following:

1. The printer is comected to the computer correctly.

2. The printer is on.

3. Paper is loaded in the printer. If ready, press Y and the Enter key. -

4-2

Rev.A

Page 82

LQ-300 Service Manual

11.

Press Y, then Enter. The default setting table appears on the display:

Adjustments

Uo.

language

Model

Character table

Page length (Tractor)

Skip-over-perforation

5 6

Auto tear-off 7 Graphic Print Direction 8

Software 9

Auto line feed

Interface selection

Bit rate

Parity bit

Date Length

ETWACK protocol

State Reply

Font

Model Name

Add Function

SW& Valid

English

PC-437 11 inch

Uni-D

ESC/P2

Auto

Selection(l

19200 bps

None

Roman

LQ-300

STD

OFF OFF

OFF

8 bit OFF OFF

These are the factory defaults programmed into this printer.

0s)

12.

Press Y, then Enter to confirm these settings and return to the initial menu.

13.

Exit the program by pressing 3, then Enter.

14.

The following message appears on the display:

Any setting value specified within this program

is not stored in the

EEPROM until

you turn the printer OFF.

Turn the printer OFF now.

15.

Turn the printer off to store the defaults shown above into the

EEPROM

assembly.

Notes:

1. If you have replaced the main board assembly, you must also perform the bidirectional adjustment procedure after competing this procedure.

2. The

SOi7VVAREand

setting by this program, but we cm only change those settings by operation panel.

INTERFACE settings are not been able to change to Factory

on the main board

Rev.A

4-3

Page 83

Adjustments

4.2.2 Bidirectional Adjustment

This

section describes the adjustment procedure necessary when the or when parts are reinstalled or replaced. assembly has been replaced.

This procedure is also necessary if the main board

LQ-300 Service Manual

LQ-300

printer is reassembled

Notes:

1. Connect the printer to a PC.

2. Turn the printer on.

3. Load paper into the pninterbypressing the

4. Load the

5. Insert a diskette containing the LQ-300Adjustment Program into the PC’s diskette drive.

6. Load the

7. When you run the program, the following message

●

When

the

main boadis

procedure first, then perform

●

Theprintercover

notperfonn

. Do . The optional color upgrade

GWBASIC

LQ-300

2. EDG, EFS

3. EDG

4. El-r

5. END Do nut input unspecified destination! Please input each destination

the

program onto the PC.

Adjustment Program’’BKMENU.BAS”.

Adjustment Program

EAI, EAI(Latin

(NLSP)

rep/aced, perform the Defaults& Machine Information Settings

the Bi-D

mustbe installed

Bi-D

Adjustment

kitmustbe

A), EIS, EIB, EUL,

whenyouperfonn

procedure if the input voltage is fluctuating heavily.

No.(

1-4 ) and Enter Key.

Adjustment procedure.

the

Bi-Dadjbstment.

removed when youpefform the

LF/FF

button.

appeam

ESP,

on the display:

EHK

Bi-Da~”ustment.

Press 1-4, then go to adjustment program of each destination

9. When you input

Bi-D

2. Defaults& Machine Information Settings

3. END If ready, press 1-3 and the

10. Type 1 to select 5 rows of H characters in both draft and LQ modes. printing, the message

iili’t!

Dra.

——

-4, the following message

LQ-300

Adjustment

Adjustment Program

Enter key. –

Bi-D

Adjustment then press Enter.

“Bi-DTESTPIUIWING”

It El II II I II II II El II El II El El B II II

appeam

on the display:

After 10 line feeds, the printer prints When the printer begins bidirectional

appears on the

displ~y.

4-4

ih:il

Figure 4-2. The Bidirectional Pattern Print

K I Ii Ii Ii Ii Ii II II II B Ii

K [

Rev.A

Page 84

LQ-300 Service Manual

After printing is complete, the following message appears on the display:

11.

Adjustments

From the 5 rows of draft patterns, find the row in which the vertical lines in the H are best aligned, then enter the value assigned to that row. The following figure is an example of the

Bi-D

printout.

After you enter the value for draft, the following message appears on the display:

12.

From the 5 rows of LQ patterns, find

the

row in which the vertical lines in the H are best

aligned, then enter the value assigned to that row.

13.

The printer lets you check your print pattern selection for confirmation following steps 9 and 10 by printing one row of the pattern you selected.

14.

After the printer prints check patterns for confirmation, the following message appears on the display:

Bi-D

is correct, press “Y” and the Enter key, and

BI-D M

incorrect, press N and

Enter. –

If your printed pattern is aligned vertically, press Y and Enter to complete the

15. adjustment. Otherwise, press N to return to step 11 to specify another adjustment

value.8.

Bi-D

Rev.A

4-5

Page 85

Chapter 5 Troubleshooting

Table of Contents

5.1 OVERVIEW

UNIT LEVEL TROUBLESHOOTING

5.2

5.3 REPAIRING THE MAIN BOARD ASSEMBLY

5.4 REPAIRING THE PRINTER MECHANISM

Figure 5-1. Figure 5-2. Figure 5-3. Figure 5-4. Figure 5-5. Figure 5-6. Figure 5-7. Figure 5-8.

Figure 5-9.

List of

Troubleshooting Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Printhead ConnectorPin Alignment . . . . . . . . . . . . . . . . . . . . . . . . 5-2

Flowchart Symbols ., . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Flowchart - 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-5

Flowchart-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Flowchatt

Flowchart -4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Flowchart -5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Flowchart -6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

-3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figures

5-1

5-4

5-11

5-13

5-1

5-4

5-6

5-7

5-8

s-g

5-10

List of Tables

Table 5-l,

Table 5-2. MotorDriverTest Points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2

Table 5-3.

Table 5-4. SensorTest Points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3

Table 5-5. Error State Indication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3

Table 5-6. Symptomsand Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4

Table 5-7. Repairing Problems in the Main Board Assembly. . . . . . . . . . . . . . 5-11

Table 5-8. Repairing the Printer Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . 5-13

PrintheadCoil

MotorCoil

ResistanceTest Points . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3

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

5-1

Page 86

LQ-300 Service Manual

5.1 OVERVIEW

Follow the procedures in the flowchart below to identify printer problems.

START

Troubleshooting

Note:

Section

Description

Page

( The Fault is Corrected )

Figure 5-1. Troubleshooting Procedures

/f the power supply board assembly is faulty, it must be replaced as a whole unit. No field repair should be performed on it, except for the replacement of

tise F1.

The following tables provide troubleshooting information.

Part

Printhead

Table 5-1.

Coil resistance 54.7 Q * 3.9 Q at 25° C (77°

Printhead

Coil Resistance

Specifications

Rev.A

5-1

Page 87

Troubleshooting

~ Printhead

LQ-300 Service Manual

Head

Pin No.

311 219 7 C C C 22151823

Head

Pin No.

5 1 13 921 17 C C C 2416 12 8 20 4

View

14 6

C: COMMON

T~::sis;:r

PF Motor

(Q2, Q3, Q4, Q5

Driver

Figure 5-2.

Printhead

Connector Pin Alignment

Table 5-2. Motor Driver Test Points

(Set Meter to Diodes. Check wfth Power Off.)

Cheek from base to ooliector and from base to

emitter. Reverse leads and test again.

(Emitter and base are marked on the main board assembly.)

Test Method

Meter Reading

The reading should be neither open nor shorted

from

base to collector or

base to emitter.

5-2

Rev.A

Page 88

LQ-300 Service Manual

Troubleshooting

Table

Motor

Connector

Number

CR Motor

(CN2)

PF Motor

(CN3)

CS Motor (CS

Board

Assembly)

Sensor Connector

Number

Common

Number

5-3.

Motor Coil Resistance Test Points

Test

Method

Test

Number

1,2,4,5

1,2, 4,5

1,2,5,6

(Set Meter

Motor from Main Board and Check it

with Printer Power Off.)

Place one lead on pin 3 and the other lead on each of the 4 test pins to check the two motor

Place one lead on pin 3 and the other lead on each of the 4 test pins to check the two motor phases.

Place one lead on pin 5 (brown) and the other lead on each of the 4 test pins to check the 4 motor phases. (Pin 3 is a common pin.)

to Ohms. Disconnect

Dhases.

Table 5-4. Sensor Test Points

Set Meter to Ohms. Check Printer witt

Test Method

Power Off.)

Meter Reading

19.6f2

8?X0

25° C, 77° F)

58.5Q

s~o (at

25° C,

77°

150Q f

25° C, 77° F)

Method Reading

5% (at

(at

HP sensor

PE sensor

Release Lever Position Sensor

(CN9)

Platen Gap Sensor

(CN1O)

Color Ribbon Sensor

Assembjy)

The printer beeps

and the PAUSE light blinks

The printer beeps (---

and the PAUSE light stays on

(CN8)

(CN7)

(CS

Board

Error Indication

(**o)

Place one lead on pin 1

lead on pin 2. Toggle the sensor position

Plaoe

lead on pin 2. Toggle the

inserting

Place one lead on pin 1 and the other lead on pin lever position.

Place one lead on pin 1 and the other lead on pin 2. Change the paper-release lever position.

Place one lead on pin 1 and the other

lead on pin

and the other

one lead on pin 1 and the other

sensor by

and removing a sheet of

Change the paper-release

Toggle sensor position.

paper.

Meter should toggle between

oDen

and shott.

Meter should toggle between open and short. (Open = paper installed.)

Meter should toggle between open and short. (Open =

continuous paper.)

Meter should toggle between open and short. (Open = platen gap lever position 2 -6)

Meter should toggle between open and

shott.

Table 5-5. Error State Indication

Error Status

Paper-out Paper is not installed error.

)

Operating error. position before the cut sheet is ejected.

Fatal error.

. The release lever is set to the TRACTOR

. The release lever is set to the FRICTION

position before the continuous paper is ejected.

Power supply voltage is abnormal.

Cause

(ODen

= home.)

(Open= active.)

Notes: (*) Theprinterbeeps

The

pfinterbeeps for

(-)

Rev.A

for 1/10 ofa second with a

1/2

of a second with a l/10-second pause.

l/10-secondpause.

5-3

Page 89

Troubleshooting LQ-300 Service Manual

5.2 UNIT LEVEL TROUBLESHOOTING

You may be able to identify the defective unit just from the symptom displayed. The table below provides the symptoms for a number of failures, so that you can easily identify the problem. Once the problem has been identified, refer to the flowchart listed in the right-hand column of the table

bel~w

to determin

e the cause of the problem.

Table 5-6. Symptoms and Problems

Symptom

Printer fails

when the power is on.

Abnormal carriage

operation.

Printing is faulty during self-test, but carriage

oDeration

Abnormal paper feed. Abnormal control

panel operation. Data sent by the host

computer is printed incorrectly.

The repair procedure flowcharts use the following symbols:

to operate

is normal.

● Carriage does not move.

. Control panel indicator

●

Carriage moves away from

. The carriage returns to home position correctly, but the

printer then fails to enter the READY mode.

● No printing at all.

. Faulty printing — some of the dot are not printing.

. The printer prints but paper feeds incorrectly. . When the LF/FF button is pressed, no paper is fed.

. Carriage operates normally at power up, and self-test

is executed

. Data from the computer is printed

correotly,

Problem

LEDs do not light.

home position at power on.

but data is not printed.

inoorreotly.

See Page

5-5

5-6

5-7

5-8

[

5-9

5-1o

Figure 5-3. Flowchart Symbols

Decision

Return to the

Start of the item

END

5-4

Rev.A

Page 90

LQ-300 Service Manual

Troubleshooting

1. Printer fails to operate when the power

Is the AC

input voltage normal?

120 V version range is 103.5-132 V

230 V version range is 198-264 V

~“”

Measure the

CN2

2 of

PSB/PSE

VP (+35

VDC)

at pins 1 and

Board Assembly.

on.

‘T

Replace the fuse.

does the new fuse also

Measure the VL of

CN2

on the

(+9

VDC)

PSB/PSE

at pins 4 and 5

Board Assembly

=’+

Verify each motor’s coil resistance

e’+

Replace the MAIN Board Assembly.

Replace the PSB/PSE

Board Assembly.

‘-

If any motor is shorted,

be sure to check the driver.

[f the driver is bad, replace along with the motor.

Rev.A

Figure 5-4. Flowchart -1

5-5

Page 91

Troubleshooting

2. Abnormal carriage operation.

LQ-300 Sarvice Manual

Are connectors CN2 -

CNIO

connecting the MAIN Board Assembly

and the Printer Mechanism

YES

Check the HP sensor.

YES

Reinsert connectors correctly.

See the troubleshooting items under Printer

Mecnanism

(Section 5.4).

YES

motor and drivers with

the same time.

Is the

‘au’tcorrected’

YES

corrected7

fault

‘>

Replace the MAIN Board Assembly

5-6

Figure 5-5. Flowchart -2

Rev.A

Page 92

LQ-300 Service Manual

Troubleshooting

3. Printing is faulty during self-test, but carriage operation

Use correct AC input voltage.

120 V version range is 103.5-132 V

0 V version range is 198-264

Hold down the

and turn on the printer to start printing the self-test.

LF/FF

button

No fluctuation from AC voltage range is permitted.

Are connectors CN2-

CN1

O from the MAIN Board

normal.

YES

Verify FFCS are properly inserted

and have

tance. If any pins are shorted, be

sure to replace the drivers along

with the r)rinthead.

contlnuky. If they are

Reinsert them correctly.

YES

Check all motor resistances

I I

and the drivers for all motors. If anything is bad or shorted,

ret)lace.

Is the fault corrected?

Rev.A

*N*

YES

Figure 5-6. Flowchart -3

5-7

Page 93

Troubleshooting

4. Abnormal paper feed.

START

LQ-3#

Sarvice Manual

smoothly

when turned manual

with the power off?

Check the resistance of the PF motor and check the PF motor drivers. If anything is bad, replace.

Is the

fault corrected?

Replace the MAIN Board Assembly.

YES

I YES

See the troubleshooting items for the printer mechanism ((Section 5.4).

Is the

fault corrected?

YES

5-8

Is the

fault corrected?

YES

Figure 5-7. Flowchart -4

Rev.A

Page 94

LQ-300 Service Manual

5. Abnormal control panel operation.

START

Troubleshooting

A .

----- .s click ‘‘-

button!

Whi

YES

Check the switches using a

multimeter.

the upper housing

assemb

IReplace the MAIN Board

If bad, replace

Iv.

YES

Replace the upper

fault corrected?

YES

9’

Figure 5-8. Flowchart -5

Refer to the other

troubleshooting items.

Rev.A

5-9

Page 95

Troubleshooting

6. Data sent by the host computer is printed incorrectly.

START

Print the self-test.

Refer to the other

troubleshooting items.

YES

Check the default settings.

LQ~OO

Service Manual

eNo

YES

Replace the MAIN

‘F

YES

Increase the the setting of

➤

the paper-thickness lever.

fault corrected?

YES

Adjust the platen gap

(Section 4.1.1).

5-10

Figure 5-9. Flowchart -6

Rev.A

Page 96

LQ-300 Service Manual

Troubleshooting

5.3 REPAIRING THE MAIN BOARD ASSEMBLY

This section provides instructions for repairing a defective main board assembly. It describes various symptoms, likely causes, and checkpoints. resistance values, and other values to be checked when evaluating faulty component. Check these values and take the appropriate

Checkpoints refer to proper waveforms,

the

operation of any potentially

a~tion.

Note:

This

section is

required on/y

for semicers who repair to the

component/eve/.

Table 5-7. Repairing Problems in the Main Board Assembly

Rev.A

5-11

Page 97

Troubleshooting

LQ-3OO

Service Manual

Table 5-7. Repairing Problems in the Main Board Assembly (Continued)

5-12

Rev.A

Page 98

LQ-300 Service Manual

5.4 REPAIRING THE PRINTER MECHANISM

Troubleshooting

For detailed procedures for replacing or adjusting parts, refer to Chapter 3,

Assembly,

and Chapter 4,

Adjustments.

If a problem or symptom recurs

Disassembly and

folIowing

repair, refer to Table 5-8 and try to find other potential causes.

Table 5-8. Repairing the Printer Mechanism

Problem

The CR

fails to operate.

The carriage does not operate when turned on

motor

(after the

carriage has been manually centered prior to power on.)

Self-test printing is not executed.

Symptom

The CR motor fails to operate the timing belt after power on.

The CR motor The belt rotates, but the

oarriage defeotive.

does not move.

The carriage moves to the movement is moves smoothly when moved left slightly, not smooth. manually. then stops.

The carnage moves to the left or right end, then stops.

The caniage

moves;

does not print. wires are

but

Cause

Foreign

substances

are lodged in the gears or elsewhere in the

mechanism. The CR motor

is defective.

pulleys are The

timing

is defective.

The

oarriage Cheek whether the carriage

The HP sensor is defective.

The

prirrthead

FFC

common the

disconnected. The

printhead

is bad.

Manually move the timing belt to see if the motor can rotate freely.

Measure the motor coil

resistance. It should be about

19.6 also check the CR motor drivers on the main board

Check for broken or worn pulleys.

belt

Ch=k that

inserted correctly into the bottom of the carriage.

Check for a broken timing belt.

Use a HP sensor.

Check the common wires for

Measure the resistance. It should be approximately 54.7

Printhead

cheek the drivers.

Checkpoint

If the motor is shorted,

the timing belt

multimeter

printhead FFC.

is shorted, also

to check the

printhead

coil

If the

an attempted

Solution

Remove the foreign substances.

Replace the CR motor (and drivers, if necessary).

Replace the belt pulleys.

Reinsert the

timing

belt. Replace the

timing

belt. Clean and

lubricate the CR guide shaft. Replace

the CR motor.

Replace the HP sensor.

Replace the

FFC.

Replace the

printhead

drivers, if necessary).

(and

Rev.A

5-13

Page 99

Troubleshooting LQ-300 Service Manual

Table 5-8. Repairing the Printer Mechanism (Continued)

Problem

Symptom

Self-test A particular

printing is abnormal.

Paper feed is abnormal.

The

ribbon ‘eed is

~bnormal.

dot is missing. is defective.

The printing is The too light, or the print

density is

not uniform.

Printing is per- Foreign

formed but the

paper is not are fed or is not fed uniformly.

The ribbon is not turning.

The ribbon feeds properly gear is only when the defective.

carriage

moves in one

direction (i.e.,

it fails to feed

when the carriage

moves in the other direction).

Cause

The

printhead

is defeotive. wires are worn.

The

platen

gap is not the first position, and check the

properly

adjusted.

substances

iodged

the paper path. The PF motor

is not driving the gear the gears and that the gears correctly. are not broken or worn.

The PF motor Measure the coil resistance for

is defective.

The ribbon cartridge is rotate its ribbon feed knob defective.

Foreign Cheek whether the RD ratchet Remove any substances are caught in the gears. .

The planetary Move the carriage manually;

Measure the pnnthead

resistance. it should be

approximately 54.7

printhead

check the drivers. Check to see if the dot wires

are worn. Check whether the tips of the

Set the gap adjustment lever to platen gap. The appropriate

value is 0.45 mm.

Perform a visual check of the paper path.

Check that no foreign Remove any

substance is

the PF motor. The approximate

value should be 56 Q. if the

motor is shotied, also check

the drivers.

Remove the ribbon cartridge, manually, and see if the ribbon

feeds normally.

rotates when the carriage is

moved

check whether the planetary

gear turns in reverse and

engages the gear.

Checkpoint

ooil

if the

is shorted, also

iodged

between

manuaily. substances.

Soiution

Replaoe printhead

drivers, if necessary).

Replace the

printhead.

Replace the

printhead.

Adjust the gap. Refer to Section 4.1.1,

Platen Gap

A@Mnent.

Remove any

foreign substances.

Replaoe

PF motor reduction gears. Replace the paper pickup gears.

Replace the PF motor (and

drivers, if

necessary).

Replace the ribbon cartridge.

foreign

Replace the ribbon feed mechanism.

the

(and

the

.,.

5-14

Rev.A

Page 100

CHAPTER 6 Maintenance

Table of Contents

6.1 PREVENTIVE MAINTENANCE

6.2 APPLYING LUBRICATION

List of Figures

Figure 6-1.

LQ-300

Lubrication Points. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2

List of Tables

Table 6-1. Lubrication Table 6-2. Lubrication

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

Points. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1

6-1