Epson LQ-2550 Service Manual

LQ-2550

TECHNICAL MANUAL

EPSON

REV.-A

PRECAUTIONS

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

to equipment:

DANGER

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

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

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

DANGER

ALWAYS DISCONNECT THE PRODUCT FROM BOTH THE POWER SOURCE AND THE

HOST COMPUTER BEFORE PERFORMING ANY MAINTENANCE OR REPAIR PROCEDURE.

NO WORK SHOULD BE PERFORMED ON THE UNIT BY PERSONS UNFAMILIAR WITH BASIC SAFETY MEASURES AS DICTATED FOR ALL ELECTRONICS TECHNICIANS IN

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

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

WARNING

REPAIRS ON EPSON PRODUCT SHOULD BE PERFORMED ONLY BY AN EPSON

CERTIFIED REPAIR TECHNICIAN.

MAKE CERTAIN THAT THE SOURCE VOLTAGE IS THE SAME AS THE RATED

VOLTAGE, LISTED ON THE SERIAL NUMBER/RATING PLATE. IF THE EPSON PROD-

UCT HAS A PRIMARY-AC RATING DIFFERENT FROM THE AVAILABLE POWER SOURCE, DO NOT CONNECT IT TO THE POWER SOURCE.

ALWAYS VERIFY THAT THE EPSON PRODUCT HAS BEEN DISCONNECTED FROM THE

POWER SOURCE BEFORE REMOVING OR REPLACING PRINTED CIRCUIT BOARDS

AND/OR INDIVIDUAL CHIPS.

IN ORDER TO PROTECT SENSITIVE

DISCHARGE EQUIPMENT, SUCH AS ANTI-STATIC WRIST STRAPS, WHEN ACCESSING INTERNAL COMPONENTS.

REPLACE MALFUNCTIONING COMPONENTS ONLY WITH THOSE COMPONENTS RECOMMENDED BY THE MANUFACTURER; INTRODUCTION OF SECOND-SOURCE

ICS

OR OTHER NONAPPROVED COMPONENTS MAY DAMAGE THE PRODUCT AND

VOID ANY APPLICABLE EPSON WARRANTY.

CHIPS AND CIRCUITRY, USE STATIC

- ii -

PREFACE

This manual describes functions, theory of electrical and mechanical operations, maintenance, and repair of the The instructions and procedures included herein are intended for the experienced repair technician, and attention should be given to the precautions on the preceding page. The chapters are organized as follows:

LQ-2550.

REV.-A

Chapter 1 -

Chapter 2 -

Chapter 3 -

Chapter 4 -

Chapter 5 -

Chapter 6 -

“

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

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

Describes the theory of printer operation.

Discusses the options

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

Provides Epson-approved techniques for troubleshooting.

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

iv -

REV.-A

REVISION TABLE

REVISION DATE ISSUED

March 31, 1988

CHANGE DOCUMENT

1st issue

f’!

-.+

,:,

-v-

(

,.,

.,.:,

~DŠˆ

REV.-A

CHAPTER 1. GENERAL DESCRIPTION CHAPTER 2. CHAPTER 3. CHAPTER 4. CHAPTER 5. CHAPTER 6. APPENDIX

OPERATING PRINCIPLES OPTIONAL EQUIPMENTS DISASSEMBLY, ASSEMBLY, AND ADJUSTMENT

TROUBLESHOOTING

MAINTENANCE

–

vi -

CHAPTER 1

GENERAL DESCRIPTION

REV.-A

FEATURES

1.1

1.2

SPECIFICATIONS

1.2.1 Hardware Specifications

1.2.2 Firmware Specifications

INTERFACE OVERVIEW

1.3

1.3.1 8-bit Parallel Interface Specifications

1.3.2

RS-232C

SELF-TEST OPERATION

1.4

1.5

HEXADECIMAL DUMP FUNCTION PRINTER INITIALIZATION

1.6

1.6.1 Hardware Initialization

1.6.2 Software Initialization

1.6.3 Default Values ERROR

1.7

1.7.1 Error Conditions

1.7.2 Buzzer Operations MAIN COMPONENTS

1.8

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

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

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

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

Serial Interface Specifications . . . . . . . . . . . . . . . . . . . . . . . . . 1-17

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

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

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

CONDITIONS AND BUZZER OPERATION . . . . . . . . . . . . . . . . . . 1-23

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

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1-1

1-3

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

1-3

1-1o

1-14

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

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

1-14

1-20 1-21 1-22 1-22 1-22 1-22

1-23 1-23 1-24

1.8.1

1.8.2

1.8.3

1.8.4

1.8.5

1.8.6

Printer Mechanism

1.8.1.1 Overview

1.8.1.2 Paper Handling and Operations

ROMA Board (Main Board) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.27

ROPS/ROPSE

(Power Supply Circuit Board)

Fan Unit Housing

Control Panel

1.8.6.1 Hardware Specification

1.8.6.2

SeiecType Function

Board

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

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

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

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

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

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1-25

1-25 1-26

1-28 1-29 1-29 1-30 1-30 1-32

l-i

REV.-A

LIST OF FIGURES

Figure 1-1.

Figure 1-2. Figure 1-3. Figure 1-4. Fanfold Paper Printable Area Figure 1-5. Figure 1-6. Figure 1-7.

Figure 1-8. Figure 1-9. Figure 1-10. Serial Data Transmission Timing Figure 1-11. Serial Interface Connector Figure 1-12. Self-Test Printing

Figure 1-13. Hexadecimal Dump List Figure 1-14. LQ-2550 Component Locations Figure 1-15. Model-5560 Printer Mechanism Figure 1-16. ROMA Board

Exterior Views of the Printhead Pin Configuration Cut Sheet Paper Printable Area

Label Printable Area Character Matrix Data .Transmission Timing for the 8-bit Parallel Interface

36-pin 57-30360 Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Handshaking for

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

LQ-2550

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

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

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

RS-232C

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

(LQ)

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

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

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Interface

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

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

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1-1 1-3 1-5 1-6

1-7 1-12

1-14

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

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

1-17 1-18 1-18 1-20 1-21 1-24

1-25 1-27

Figure 1-17. Figure 1-18. Fan Unit Figure 1-19. Housing Figure 1-20. Control Panel Figure 1-21.

ROPS/ROPSE

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

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SelecType

Operational Sequence

LIST OF TABLES

Table 1-1. Table 1-2. Table 1-3. Table 14. Table 1-5. Table 1-6. Table 1-7.

Optional Units Optional Interface Boards Line Feed Cut Sheet Paper Specified Conditions Fanfold Paper Specified Conditions

Ribbon Cartridge Specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Dimensions and Weight

Speeds

Board

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

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—

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1-28 1-29 1-29 1-30 1-33

1-2 1-2 14 1-5 1-6 1-8

1-8 Table 1-8. Table 1-9. Table 1-10.

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

Environmental Conditions Printing Mode

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

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

1-6

1-9

1-11

REV.-A

Table 1-11. Character Matrix and Character Size Table 1-12. 8-bit Parallel l/F Connector

Pin Assignments

Table 1-13. Select/Deselect Control Table 1-14. Serial Interface Handshaking

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

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

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

Table 1-15. RS-232C Serial Interface Connector

Pin Assignments Table 1-16. Self-Test Operation Table 1-17. Hexadecimal Dump Operation

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

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

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

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

1-13

1-15 1-16 1-17

1-19 1-20 1-21

l-iii

‘

1.1 FEATURES

The

LQ-2550 printer is a multifunction, 24-pin, impact dot-matrix printer. The main features Of this

printer are:

ESC/P

●

Expanded is implemented as a standard

Upward A

maximum print speed of 400

Direct selection of font, pitch, and normal/condensed mode, and SelecType function with LCD (Liquid

Crystal Display) which makes panel settings easier Multiple standard fonts (Roman, Saris Serif, Courier, Prestige, Script, OCR-A, and OCR-B) Advanced paper handling: Automatic release function Automatic platen gap adjustment function

Micro adjustment function Tear-off function Automatic Color printing capability

Low-noise acoustics Both 8-bit parallel and Push and (optional) pull tractor feeding , Printing of fanfold paper without removal of the cut sheet feeder (option) Optional interface for the EPSON 8100 series

Optional low-priced, double-bin cut sheet feeder with envelope feeding capability

compatibility with the

paper-loading/ejectin9 function

LQ-2500/LQ-2500+

CPS

in draft mode at 12

RS-232C serial interfaces

CPI

and 133

CPS

in LQ mode at 12

REV.-A

CPI

Figure 1-1 shows exterior views of the printer, Table 1-1 lists optional units that are available, and Table

1-2 lists the optional interface boards (refer to Chapter 3 for more detailed information) for the

Setting for Continuous Paper

Setting for Cut Sheet Paper

LQ-2550.

Figure 1-1. Exterior Views of the

1-1

LQ-2550

Table 1-1. Optional Units

No. #73 14 #7343 #7394 Scanner option kit

#7762 #7763 #7764

No.

#8143 #8145 RS-232C current loop interface type II #8 148 Intelligent serial interface

Name Pull tractor unit Double bin cut sheet feeder

Ribbon cartridge (black) Ribbon Ribbon cartridge (film-black)

Table 1-2. Optional Interface Boards

Name New serial interface

cattridge (color)

... ,

{:’”

#8 149 Intelligent serial interface type II

#8 149M

#8 161

#81 65

#8 172

#8 172M 128K-byte buffer parallel interface

Intelligent serial interface type Ill

IEEE-488 interface

Intelligent IEEE-488 interface

32 K-byte buffer parallel interface

g:;;

.7,

...,

1-2

1.2 SPECIFICATIONS

The LQ-2550 communicates with a wide variety of host computers, with the aid of the optional Identity

Modules. However, this section describes the specifications for the printer without the Identity Module. Specifications not affected by firmware (hardware specifications) are the same whether or not the Identity Module is installed.

1.2.1 Hardware Specifications

REV.-A

Printing

Pin Configuration

Method

Serial, impact dot matrix See Figure 1-2 (1 2x2 staggered, diameter: 0.2 mm).

=’

13 15

1’

21 23

$’-

2 4

10 12

..=

1160”

Figure 1-2. Printhead Pin Configuration

1-3

REV.-A

Feeding Method

Friction feed

Tractor feed (push: standard, push-pull: optional)

NOTES: 1. When using friction feed:

● Select friction feed on the control panel.

● Do not use continuous (fanfold) paper.

● Do not use a single sheet paper shorter than 92mm or longer than 364mm

● Do not perform any reverse paper feed operations within the top 8.5 mm and bottom

22 mm of the paper.

● Do not perform reverse feed beyond 1/6” after the paper end has been detected.

● Do not use multi-part, single-sheet forms.

2. When using push-pull tractor feed:

● Select tractor feed on the control panel.

● Mount the pull tractor unit (optional).

● Do not loosen the paper between the platen and the pull sprocket.

● Precisely align the horizontal position of the pull sprocket and push tractor.

● Do not perform reverse feeding for more than 1/6”.

● Do not perform reverse feeding after the paper end has been detected.

● Multiple copy paper must be pasted together using line or dots.

● Copy paper must be carbonless multi-part paper.

Paper Loading Directions

Fanfold paper

Cut sheet paper Line Spacing Line Feed Speed

Feeding Method

Friction without Friction with

Tractor

Inserted from the rear Inserted from the top

1/6”, 1/8”, or programmable in units of 1/1 80”

See Table 1-3.

Table 1-3. Line Feed Speeds

1/6” line spacing

Continuous

[ins/line] [inch/s]

CSF

84 4.0

orl/360”

1-4

Paper Specifications

Cut sheet paper

Refer to Table 1-4 and

REV.-A

Figure 1-3.

Table 1-4. Cut Sheet Paper

Width

Length Thickness [mm] Weight

Quality

Copies

0.1

2“,

3 mm.

or more

.33”, 6.5

mol

[mm] [mm]

[lb]

7.2-14.3”,

Specified Conditions

-364 (7.2 - 14.3”)

182

364 (14.3”) max.

0.065-0.10 (0.0025 - 0.004”)

I 14-22

Plain paper

Not available

(52 -82

182 ’364 mm

Printable area

g/m2)

-0.1

2“, 3

or more

NOTES:

XYZ

MAX. . . 364mm

a r

ABC

0.52”,

Printing is possible approx. accuracy can not be assured in the area Printing is possible approximately 45.9mm past the point where end-of-page has been

detected. Thus, the value 13.3mm (0.52”) (lowest print position) is given for reference only. Paper feed accuracy cannot be bottom of the page.

3mm

8.5mm

(0.33”) from the top of the paper. But the paper feed

approx. 22mm (0.87”) from the top of the paper.

assured in the area approximately 22mm(0.87”) from the

Figure

1-3. Cut

Sheet Paper Printable Area

1-5

REV.-A

Fanfold paper

Width

Copies Quality Total Thickness [mm] Weight

Refer to Table 1-5 and Figure 1-4.

Table 1-5. Fanfold Paper Specified Conditions

-406 (4.0 - 16.0”)

[mm]

[sheets]

101 6 (1 original + 5 ) over the entire temperature range

Plain paper

0.06-0.46 (0.0023 -0.0 18“)

IIbs]

Printable area

0.35”, 9 mm

or more

0.35”, 9 mm

Printable

area

1 sheet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

6 sheets ...................12

4-16” ,

0 0

ABC

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

0 0

o ABC

0’

0 0

Printable area

-15 (40 - 58.2

101

-4C)6mm

-22 (40 -82

g/m2)

0 0

0 0 0

XYZ

g/m2)

each sheet

.“3

f ~

. . . . .

{ ;

.., ,.

,,.

101 - 381 mm (4 -

15“) wide paper . . . . . . . . . . . . . . . . . . . . . 13mm or more,

406 mm ( 16“) wide paper . . . . . . . . . . . . . . . . . . . . . 26mm or more

Figure 1-4. Fanfold Paper Printable Area

1-6

REV.-A Envelopes

Size

No. 6 165 x 92 mm (6.5 x 3.63”) No. 10241 x 105mm (9.5 x 4. 13“)

Quality Thickness

Bond paper, xerographic copier paper, airmail paper

0.16-0.52 mm (0.0063 -0.01 97”)

NOTE: Differences in thickness within printing area must be less than 0.25 mm (0.0098”).

g/m2)

Weight

12- 24 lb (45

-91

NOTES: 1. Envelope

2. Keep the

printing is only available at normal temperature. longer side of the envelope horizontal.

Labels

Size

Thickness

1/2 X 15/1 6“, 4 X 15/1 6“, 4 X 1“7/16“

O.19 mm (0.0075”) max.

NOTE: Thickness excluding the base paper must be less than or equal to 0.12 mm (0.0047”).

NOTES: 1.

Printing of labels is only possible at normal temperature. Labels must be fanfold.

2. Labels with pressure-sensitive paper must be joined by dot or line pasting, and the total

3. thickness must be less than or equal to 0.3 mm (0.01 1 8“) and should be printed under conditions between 5 to 35 ‘C and 20 to 80% RH.

Examples of labels: AVERY CONTINUOUS FORM LABELS

AVERY MINI-LINE LABELS

Printable

area

See Figure 1-5.

36.5mm

(176”)

23.

(’5+6”)

101.6 mm

Emm

63.5mm (2 ”}2”)

Figure 1-5. Label Printable Area

[

4“ )

1-7

REV.-A

Ribbon

Ribbon Model No. Type Color

Life [million/characters]*’

xl: LQ-selftest

Dimensions Weight

Cartridge

See Table 1-6.

Table 1-6. Ribbon Cartridge Specification

#7762 Normal

Black

See Table 1-7 (Details are shown in Figure A-59.) See Table 1-7.

Table 1-7. Dimensions and Weight

#7764 #7763

Film

0.2

[

Multi-color

Black, Cyan, Magenta, and yellow

Black: 1 Cyan: 0.7 Magenta: 0.7 Yellow: 0.5

. . .

‘

Width [mm] Height [mm]

676

NOTE: Including the paper feed knob and paper guide.

Electrical Specifications See Table 1-8.

Table 1-8. Electrical Specifications

Voltage ~ AC] 108- 132

Frequency Range [Hz]

“’

Rating Current

Insulation Resistance [M ohm] min. (between AC line and chassis)

Dielectric Strength ~ AC, rms] (1 minute, between AC line and chassis)

[A]

198

Depth [mm]

100-

535

120

1.6

1250

Version

Weight [Kg]

(approx.)

220-240 V Version

49.5 -60.5

198-264

1.0

3750

,,.,,

-..+,

*1:

At draft-selftest printing.

1-8

REV.-A

Environmental Conditions

x: With shipment container

‘.

Reliability

MCBF

MTBF

Printhead life

Refer to Table 1-9.

Table 1-9. Environmental Conditions

Temperature [“C]

Humidity [% RH] Resistance to shock [G]

1 (within 1 ms)

Resistance to Vibration [G]

(55 Hz, max.)

5 million lines (excluding

(MCBF . . .

6000

(POH

200 million strokes/wire

Mean Cycles Between Failure)

POH

(duty 25%)

. . .

Power On Hour)

Storage

–30 - 65*

5-85

0.50

printhead)

Operating

5-35

10-80

0.25

Safety Approvals

Safety standards

Radio frequency

Interface

(RFI)

UL478 (U.S.A. version)

CSA22.2#154

VDE0806 (TUV)

FCC class B (U.S.A. version) VDE0871 (self-certification)

(European version)

1-9

REV.-A

1.2.2 Firmware Specifications

Control Code Printing Direction

Input Data Buffer Character Code Character Set

Family

Font and Character Spacing Roman:

Printing Mode

NOTE: A condensed mode for 15

ESC/P-83 Expanded Bidirectional logic

8K-bytes

8 bits 96 ASCII and 13 international character sets Roman:

SansSerif:

Courier: Prestige: Script: OCR-B: OCR-A:

SansSerif:

Courier:

Prestige: Script: OCR-B: OCR-A:

Draft:

Printing quality

Character pitch (10, 12, 15

Condensed

Double-width

Double-height

Emphasized Double-strike Italic Underlined Outline Shadow

CPI

seeking

No. O

No. 1

No. 2 No. 3 No. 4 No. 5 No. 6

10, 12, 15, Proportional 10, 12, 15, Proportional 10, 12, 15, Proportional 10, 12, 15, Proportional

10, 12, 15, Proportional

10, 12, Proportional 10, 12 Proportional 10, 12, 15

(Draft/LQ)

CPI

or Propotiional)

characters is not available.

f’

- ,:

Print Speed Refer to Table 1-10.

1-10

Table 1-10. Printing Mode

REV.-A

.,,

Pitch

10 0

‘proportional

Superl’ subscript

Condensed Emphasized

0 0 0

x x x

Double

Width

0 10

o 17.1

Pitch

Character

ICPI] Columns

Draft

333

167

10 167

Printing

17.1

8.5 142 94 116

20 333 221 272

10 167 15 15

7.5 250 167

7.5 124

8.6 —

20 221

4.3

10 111

8.6 —

12.8 —

6.4 —

25.7 — 60

12.8

285 189 233

400

200 67 200 133 163

100

500 167 250

[CPS]

Ignored

Speed

111

55 68

111

133 163

111

83 102

94 Max. 116

189 Max. 233

444 Min. 544

94 221 142

333 Min. 408

71 167

285 Max. 174 667

142

333 Min. 204

Printable

Min. 272

Max. 58

Min. 136

Max. 116

Min. 272

Max. 174

Max. 87

Min. 204

Min. 816

Max. 87

136

136 204 204

102

; ~

NOTES: 1. Max. means the value when the maximum width characters are printed.

2. Min. means the value when the minimum width characters are printed.

3. “

—“ means that

specified.

character set is automatically selected when proportional pitch is

1-11

REV.-A

character Matrix

(Normal Character)

See Figure 1-6.

(Superscript Character)

Pin Nos. 17 to 24 are not used for superscript printing.

. . .

--,

17 18 19

22 23 24

3 4 5 6 7

Ascender Area

1 L

Descender Area

Face

Character

(15pi!Ch)

Wid!h(al)

Width (CW)

T s

A c

(a 2

—

10 II

12 I?

;

3 4

;

6 7

c E

H T

s P A

c E

—

(Subscript Character)

Pin Nos. 1 to 8 are not used for subscript printing.

—

T s

P A

—

c E

17 18

;: 21

22 23

L E F T

s P A c E

—

. .

r’

... ;

Figure 1-6. Character Matrix

1-12

REV.-A

Character Size

See Table 1-11.

Table 1-11. Character Matrix and Character Size

Face

Printing Mode

DRAFT, 10 pitch DRAFT, 12 pitch DRAFT, 15 pitch DRAFT, 10 pitch, condensed DRAFT, 12 pitch, condensed

LQ,

10 pitch

LQ,

pitch 29 X 23 360 2.0 X 3.2

LQ,

15 pitch

LQ,

10 pitch, condensed

LQ,

12 pitch, condensed

LQ,

proportional Max. 39 x 23 360 2.6 X 3.2

Matrix

9 X 23 9

X 23

X 16 120 1.0 X 2.3 120

. . .

X 23 360 2.0 X 3.2

X 16 360 1.0 X 2.3 180

. . . . . .

Min. 18 x 23 360 1.0

HDD

120

240

360 I . . .

360

120 1.9

‘1

. . .

Character Size

H. x V. [mm]

1.9 X 3.2

X 3.2 120

. . .

X 3.2

Unit

ESC

]

120

240

180 180

360

180

LQ,

proportional, condensed

LQ,

proportional, super/subscript Max. 28 x 16

proportional, super/subscript,

condensed

. . . . . .

Min. 12 x 16 360 0.7

. . . . . .

360 360 360 1.8

360 360

. . . . . .

X 2.3

. . . . .

NOTES: 1. “HDD” means the Horizontal dot density, and the units are dots per inch.

2. “Face matrix” and “character size” indicate the maximum size of characters and this vail

will change with condition of paper.

3. “Unit

4. “...” indicates that the character matrix is reformed

ESC sp” indicates the minimum length which

that can be specified with

becomes half of a non-condensed character.

ESC sp control code.

is added to the right of the character

by printer firmware. Character width

360

180

360

1-13

REV.-A

1.3 INTERFACE OVERVIEW

The LQ-2550 has both an 8-bit interface can be selected from the control

Parallel

interface

Panel

(For details of

1.8.6.2.).

1.3.1 8-bit Parallel Interface Specifications

Data Transmission Mode

Synchronization

Handshaking

Logic Level

Data Transmission Timing Connector Connector Pin Assignment Select/Deselect

(DC1/DC3)

Control

BUSY

ACKNLG

DATA

STROBE

8-bit parallel By STROBE pulse

BUSY and

ITL (LS)

compatible

ACKNLG

See Figure 1-7. 57-30360 (AMPHENOL) or equivalent (See Figure 1-8.)

Refer to Table 1-12.

Refer to Table 1-13.

and an

RS-232C

the control Panel

(either or both)

serial

interface as standard. The

settings, refer to Section

NOTE: Transmission time

Figure 1-7.

(rising and falling time) of every input signal must be less than 0.2

Data Transmission Timing for the 8-bit Parallel Interface

19. GNO

( Pa.,

..,ml.

(Pm.. w,tn2.)

IPa, c w.tn3.)

( Pair

.,,”4.)

(Pa;, w:,n6.)

Pa,. w,,n?.]

w:m8.)

(

Pm,, .,,.9.)

(Pa.<

.,,-12.1

)

l.)

5. 23.

6, ?.

9. 10

12 13

14 J5

16 17

20.

21.

22.

28,

25.

26. 2’7.

28.

29,

30.

31. 32, 33,

34. NC

3s.

36. SLCTIN

GNO

CJNO [Pa., w:tm5.1

GNO

GNO ( GNO ( Per GNO GNO (P,., .,,.10,1

GNO ( Par -,. I

GNO Fit ERRGR GNO

.5V

—.

#s.

Figure 1-8. 36-Pin 57-30360 Connector

1-14

No.1

2 3 4 5 6 7 8 9

Signal

STROBE

DATA1 DATA2 DATA3 DATA4 DATA5 DATA6 DATA7 26 DATA8

Table 1-12. 8-bit Parallel l/F Connector Pin Assignments

Return

20 21 22 23 24 25

I 1/0 I

Strobe pulse to read the input data. Pulse width must be more than 0.5

this signal.

Parallel input data to the printer.

“HIGH” level means data “l”.

“LOW’” level means data “O”. I

I I I

KS.

Description

Input data is latched after falling edge of

11 12

13 SLCT

14 AUTOFEED-XT

15 16 17 18

32 33

. .

ACKNLG

BUSY

GND

Chassis GND

GND

INIT

ERROR

GND

+ 5V

SLECT-IN

28 0 This pulse indicates data are received and the printer is

29 0 30 0

—

— — — — —

— — — —

—

ready to accept next data. Pulse width is approx. 11 “HIGH” indicates printer can not accept data. “HIGH” indicates paper-out.

This signal is effective only when ERROR signal is “LOW”.

Always “HIGH”. (Pulled up to

resistor.)

If this signal is “LOW” when the printer is initialized, a line feed is automatically performed by input of “CR” code (Auto

LF).

—

Not used.

— Ground for twisted-pair. — Printer chassis ground. — Not used. — Ground for twisted-pair.

Pulse (width: 50 WS min., active “LOW”) input for printer

initialization.

“LOW” indicates that some error has occurred in the printer.

— Ground for twisted-pair. — Not used.

Always “HIGH”. (Pulled up to

resistor.)

If the signal is “LOW” when printer is initialized, the

l/DC3

control is disabled.

+5V

through 3.3 K ohms

+5V

through 3.3 K ohms

IJS.

NOTES: 1. “Direction” of signal flow is as viewed from the printer.

“Return” denotes “TWISTED PAIR RETURN” and is to be connected at signal ground level.

As to the wiring

never fail to connect the return side.

for the interface, be sure to use a twisted-pair cable for each signal and

To prevent noise, cables should be shielded and

connected to the chassis of the host computer and the printer.

1-15

REV.-A

ON-LINE

OFF-LINE

ON-LINE

SLCT-IN

HIGH/LOW

HIGH

LOW

Dcl/Dc3

l/DC3

DC 1

DC3

DC1

DC3

Table 1-13. Select/Deselect Control

ERROR

LOW

HIGH

LOW/HIGH (During data entry)

LOW/HIGH data entry)

LOW/HIGH (During data entry)

LOW/HIGH data entry)

BUSY

(Durring

No pulse

Pulse output after Enable entry)

Pulse output after entry See Note 2)

Pulse output after Enable (Normal entry

Pulse output after entry

ACKNLG

(’.

DATA ENTRY

Disable

(Normal Process) Enable (Waits DC 1.

Process)

NOTES: 1.

In Table 1-13, it is assumed that no ERROR status exists other than that attributable to the OFF-LINE mode. Once the printer is deselected by the

DC3

code, the printer will not revert to the selected

state until the DC 1 code is input (In the deselected state, input data is ignored until DC 1

is received.).

The DC 1 and

DC3

codes are enabled only when the

SLCT-IN

signal (Input Connector Pin No. 36 when the parallel interface unit is used) is HIGH and the printer is initialized. The SLCT4N signal is LOW when the printer is initialized. At this time the DC

l/DC3

printer

select/deselect control is invalidated, and these control codes are ignored.

The

SLCT-IN

signal is HIGH, and it is not set to LOW by SelecType function when the printer

is initialized. The printer will start from the selected (DC 1 ) state.

(.;

‘“’

1-16

‘. ,

1.3.2 RS-232C Serial Interface Specifications

Data Transmission Mode

Synchronization Handshaking

RS-232C serial

Asynchronous

DTR

(REV) signal or X-ON/OFF protocol

Refer to Table 1-14 and Figure 1-9.

Table 1-14. Serial Interface Handshaking

REV.-A

DTR Signal

MARK

SPACE

DTR {REV)

MARK ( -

SPASE ( +

X-ON/OFF protocol X-OFF

(DC3\l

3H)

X-ON (DC 1/1 1 H)

Signal

12V)

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

L,-

8Kbyte

When the number of bytes remaining in the input

buffer reaches 256 or less, the signal level goes to

MARK, or an X-OFF code is sent to the host computer. This indicates that the printer is not ready to receive data.

When the number of bytes remaining in the input

buffer reaches 528 or more, the signal level goes to

SPACE, or an X-ON code is sent to the host computer. This indicates that the printer is ready to receive data.

‘

‘:’

512 byte 256byte O

Description

I I I

I I

I I I

‘-

t I

byte Input Buffer Vacant Area

Word Length

bit

Start

Data bits Parity Stop bits

Bit Rate

Logic Level

X-ON

Figure 1-9. Handshaking for

X-OFF

RS-232C

8 Odd, Even, or none

or more

1 bit

1200,

300, 600,

EIA level, MARK: logical 1 (–3 - –27 V)

SPACE: logical O (+3 - +27 V)

2400, 4800, 9600, or 19200 BPS

1-17

X-ON/X-OFF Protocol

Interface

REV.-A Data Transmission Timing

------

[

+V)

DTR

( -v)

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

(

+V)

RXD

[

-v)

(

+V)

RXO –“

( -v]

(

+V)

TXD

(

-v)

See Figure

—-

‘IIM!l!m

Stmf

Blt

1-10.

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

:s!Mik16k

s;t&*

Data

Blt

X-ONDZ-OFF

DTR

Handshake

POrli/y

Data

Bit

StW

.stu-t

Blt

Protocol

Bit

Data

[X-OFF)

Pcr:;y

,,—

Blt

--7

stop

S::t

Blt

“T-

D~t:at:t

. .

{

“

...

,’

NOTES: 1. The value of “T” varies according to the input data.

2. The word structure of serial data is 1 start bit + 8 data bits + parity (Odd, Even, or none)

or more stop bits.

Figure 1-10. Serial Data Transmission Timing

Error Detection

Connector Connector Pin Assignments

Parity error: Overrun error: Ignored

Framing error: Ignored D-SUB 25-pin connector (See Figure 1-1 1.) Refer to Table 1-15.

1. CHA5.51S

Z.TXO

3.RxD

4.NC

5.NC SAC

7.SIGW e.Nc

9.NC

to.Nc

t I.REv

IZ.NC

IXNC

—

“*”

GND

GNO

is printed.

34.

45. \6. !7. Nc

18.

19. NC

2D.DTR 2i.NC Z2.NC 2%NC

Z4.NC

2SNC

-..

,,,

Figure 1-11. Serial Interface Connector

1-18

:.,

. . .,

,’

Table 1-15. RS-232C Serial Interface Connector Pin Assignments

Pin No. Signal

TXD o

DTR

1/0

Transmit data.

Indicates when printer is ready to receive data. “MARK” level

indicates printer is not ready to receive data.

3 7

REV(=2nd RTS) RXD

SIGNAL

CHASSIS

GND

— —

Same as Receive data.

DTR.

Signal (Logic) ground level. Printer chassis ground.

NOTE: “Direction” of signal flow is as viewed from the printer.

Description

1-19

REV.-A

1.4 SELF-TEST OPERATION

-’%

The LQ-2550 printer has the following self-test functions. The current and default settings at the control -‘“

panel are printed when the self-test is executed.

is printed out at the end of the first page.

Table 1-16 lists the self-test operating instructions and Figure

Table 1-16. Self-Test Operation

Type-face

Draft

Turn the power ON while pressing the

LINE FEED switch.

Turn the power ON while pressing the

FORM FEED switch.

Start

Current setting

FONT PITCH CONDENSED FORM

LNG

Tractor 66LINE

CSF

binl

CSF bin2

1“ SKIP

AUTO TEAR OFF

LEFT MARGIN RIGHT MARGIN

TABLE

COUNTRY

PRINT DIR. Bi-d

COLOR

Default setting

When

the

Roman

10CPI

132LINE

Italic

Black

C-SF

mode is

Push the ON LINE switch, and turn the power OFF.

enabIed,

1-12 shows the self-test printing.

the current sheet length

stop

off

136

USA

# . .

.+’

. . .

c“

- ,,. .

. .

A{]

MACRO

IRoman

! “

#$%&.

‘ (

)*+,

-. /0 I 234 56789: ; < =

! “ #$%&‘ ( )*+ , -. /01234 56789 : ; < = > ?@

“

#$%&.

‘ ( )*+ ,-. /0123456789 : ; < = > ?@ #$%& ‘ ( )*+ ,-. /0 123456789 : ; < = > ?@

$%&.

‘ ( )*+ ,-. /0 123456789

‘ ( )*+ , -. /0 123456789

& ‘ ( )*+ , -

. /0 1234 56789:

Figure 1-12. Self-Test Printing (LQ)

: ; < = > : ; < = > ?@!

“

, < = >

1-20

?@i4FWT)J?FGH

ABCI)EFGHIJKLMNOE

?@.A~c:~F.F~H T

>?@ABCI)EFcHTJ}

ABCllEFGHI.JKI

ABCDFFGHIJKIIh

A13CDEFGHIJKLMb

IJKl,MN(

JK],MNOPG

. . . . .

1.5 HEXADECIMAL DUMP FUNCTION

In hexadecimal dump mode, the printer prints out the data it receives in hexadecimal format. The printer prints a column of 16 hexadecimal values, followed by a column containing the 16 corresponding ASCII characters. If there is no corresponding printable character for a value (e.g., a control code, such as a carriage return or line feed), a period (.) is printed in the ASCII column in the position of the code.

Each line of the dump contains 16 values, printed in the order they were received, and any remaining data (less than 16 values on the final line) can be printed by operating the ON LINE switch. Table 1-17 explains the hexadecimal dump operation and Figure 1-13 shows a sample printout of the operation.

Table 1-17. Hexadecimal Dump Operation

REV.-A

Hexadecimal dump mode

Data Dump Mode

31 2E 31 20 46 45 41 54 55 52 45 53 54 68 65 20 4C 51 2D 38 35 30 2F 31 30 35 30 20 70 72 69 74 69 66 2D 70 69 6E 20 70 72 69 69 6D 70

72 69 78 20 70 72 69 6E 74 65 72 73 2E 20 54 68

65 20 6D

66 20 74 68 65 20 74 68 65 73 65 20 70 72 69

E 74 65 72 73 20 61 72 65 3A 20 OD OA OD OA 2E

~ 20 55 70 77 61 72 64 20 63 6 F 6D 70 61 74 69 62 69

6C 69 74 79 20 77 69 74 68 20 74 68 65 20 4C

2D 38 30 30 2F 31 30 30 30 OD

,6D 61 78 69 6D 75 6D 20 70 72 69 6E 74 20 73 70

65 65 64 20 6F

,6E 20 64 72 61 66 74 20 6D 6F 64 65 20

Function

6E 74 65 72 73 20 61 72 65 20 6D 75 6C

6E 63 74 69 6F

63 74 20 64 6F 74 2D OD 06 6D 61 74

69 6E 20 66 65 61 74 75 ‘72 65 73 20

20 32 36 34 20 43 50 53 20 69

Turn the power ON while Turn the power OFF.

pressing both the LINE FEED and FORM FEED switches.

Operation

OD 06

6E 61

74 68 65 61 64 2C 20

6C 2C 20 32 34

2 E 20 41 20

74 20

stop

1.1 FEATURES. . . .

The

LQ-850/1050

printers are mul

tifunctlonal,

-pin

print head,

impact dot- . . mat

rix

printers. Th e main f eatu res of the these

nters

ility

Q-800 /1000... maximum print sp eed of 264 n draft mode at

are: . . . . .

Upward

with

compatib

pri

the L

CPS

Fig 1-13. Hexadecimal Dump List

1-21

REV.-A

1.6 PRINTER INITIALIZATION

There are two initialization methods: hardware

1.6.1 Hardware Initialization

This type of initialization occurs when printer power is turned on or when the printer receives the I NIT signal from the the following actions:

● Initializes the printer mechanism

● Clears the downloaded character set

● Clears the input data buffer

● Clears the image buffer

● Sets printer selections to their default values (Refer to Section 1.6.3.)

1.6.2

This type of initialization occurs when the printer receives a command

printer is initialized in this way, it performs the following actions:

● Clears the image buffer

● Sets printer selections to their default values

(Several settings are changed by the last

1.6.3.).

host via the 8-bjt Parallel interface. When the

Software Initialization

initialization and software initialization.

winter is

SelecType operation before

initialized in this wwt it Performs

(ESC @)

ESC@

via software. When the

is input (Refer to Section

1.6.3

The default values set by the default setting mode of the initialization. The printer’s default values are as follows: Page

Left and Right Margin Line Spacing

Vertical Tab Positions

Horizontal Tab Positions

VFU Channel

Family Number

Downloaded Characters Justification Character Spacing

Bit Image Mode Assignment

Default Values

Position

of Type Style

SelecType

Preset paper position becomes top-of-form position

SelecType setting

1/6” Cleared Every 8 characters (relative) Channel O

SelecType setting

Deselected Left justification No additional spacing

ESC ESC

K = Z =

ESC *O, ESC

ESC

L =

function are only reset by a hardware

ESC xl, ESC

Y =

ESC X2,

1-22

. .,,

+ 271 hidden pages

Epson LQ-2550 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

PRECAUTIONS

PREFACE

REVISION TABLE

TABLE OF CONTENTS

GENERAL DESCRIPTION

1.2 SPECIFICATIONS