Epson DLQ-3000 Minerva+ User manual

EPSON
24-PIN DOT MATRIX PRINTER
EPSON DLQ-3000+
SERVICE MANUAL
SEIKO EPSON CORPORATION
4008259

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NOTICE
 All rights reserved. Reproduction of any part of this manual in any form whatsoever
without SEIKO EPSON’s express written permission is forbidden.
 The contents of this manual are subjects to change without notice.
 All efforts have been made to ensure the accuracy of the contents of this manual.
However, should any errors be detected, SEIKO EPSON would greatly appreciate
being informed of them.
 The above notwithstanding SEIKO EPSON can assume no responsibility for any errors
in this manual or the consequences thereof.
EPSON is a registered trademark of SEIKO EPSON CORPORATION.
General Notice:
Other product names used herein are for identification purposes only and may be
trademarks or registered trademarks of their respective companies.
Copyright 1997 by SEIKO EPSON CORPORATION
Nagano, Japan

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PRECAUTIONS
Precautionary notations throughout the text are categorized relative to 1) personal injury and 2)
damage to equipment.
WARNING Signals a precaution which, if ignored, could result in serious or fatal personal
injury. Great caution should be exercised in performing procedures preceded by
WARNING Headings.
CAUTION 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.
WARNING
1. ALWAYS DISCONNECT THE PRODUCT FROM BOTH THE POWER SOURCE AND
PERIPHERAL DEVICES PERFORMING ANY MAINTENANCE OR REPAIR PROCEDURES.
2. 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.
3. WHEN PERFORMING TESTING AS DICTATED WITHIN THIS MANUAL. DO NOT
CONNECT THE UNIT TO A POWER SOURCE UNTIL INSTRUCTED TO DO SO. WHEN
THE POWER SUPPLY CABLE MUST BE CONNECTED, USE EXTREME CAUTION IN
WORKING ON POWER SUPPLY AND OTHER ELECTRONIC COMPONENTS.
CAUTION
1. REPAIRS ON EPSON PRODUCT SHOULD BE PERFORMED ONLY BY EPSON
CERTIFIED REPAIR TECHNICIAN.
2. MAKE CERTAIN THAT THE SOURCE VOLTAGE IS THE SAME AS THE RATED VOLTAGE,
LISTED ON THE SERIAL NUMBER/RATING PLATE. IF THE EPSON PRODUCT HAS A
PRIMARY AC RATING DIFFERENT FROM AVAILABLE POWER SOURCE, DO NOT
CONNECT IT TO THE POWER SOURCE.
3. ALWAYS VERIFY THAT THE EPSON PRODUCT HAS BEEN DISCONNECTED FROM THE
POWER SOURCE BEFORE REMOVING OR REPLACING PRINTED CIRCUIT BOARDS
AND/OR INDIVIDUAL CHIPS.
4. IN ORDER TO PROTECT SENSITIVE MICROPROCESSORS AND CIRCUITRY, USE
STATIC DISCHARGE EQUIPMENT, SUCH AS ANTI-STATIC WRIST STRAPS, WHEN
ACCESSING INTERNAL COMPONENTS.
5. REPLACE MALFUNCTIONING COMPONENTS ONLY WITH THOSE COMPONENTS BY
THE MANUFACTURE; INTRODUCTION OF SECOND-SOURCE ICs OR OTHER
NONAPPROVED COMPONENTS MAY DAMAGE THE PRODUCT AND VOID ANY
APPLICABLE EPSON WARRANTY.

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PREFACE
This manual describes functions, theory of electrical and mechanical operations, maintenance,
and repair of DLQ-3000+.
The instructions and procedures included herein are intended for the experience repair technician,
and attention should be given to die precautions on the preceding page. The Chapters are
organized as follows:
CHAPTER 1. GENERAL DESCRIPTION
Provides a general product overview, lists specifications, and illustrates the main components of
the printer.
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. ADJUSTMENT
Includes a step-by-step guide for adjustment.
CHAPTER 5. TROUBLESHOOTING
Provides EPSON-approved techniques for troubleshooting.
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.

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REVISION SHEET
Revision Issued Data Contents
Rev. A August 21 1997 First Release

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TABLE OF CONTENTS
CHAPTER 1. GENERAL DESCRIPTION
CHAPTER 2. OPERATING PRINCIPLES
CHAPTER 3. DISASSEMBLY AND ASSEMBLY
CHAPTER 4. ADJUSTMENT
CHAPTER 5. TROUBLESHOOTING
CHAPTER 6. MAINTENANCE
APPENDIX

Chapter 1
Product Description
1.1 Features ..................................................................................................1-1
1.2 Consumables and Options....................................................................1-3
1.3 Hardware Specification..........................................................................1-4
1.3.1 printing Specification....................................................................1-4
1.3.2 Character Specifications and Control Codes.............................1-7
1.3.2.1 Coded Character Sets.........................................................1-7
1.3.2.2 Type Faces..........................................................................1-7
1.3.2.3 Rendition .............................................................................1-7
1.3.2.4 Combination of character tables and typefaces ..................1-8
1.3.2.5 Memory Size........................................................................1-9
1.3.2.6 Character Size.....................................................................1-9
1.3.2.7 Control Codes......................................................................1-9
1.3.3 Paper Feed Specification............................................................1-10
1.3.3.1 Friction Feed (Cut sheet)...................................................1-10
1.3.3.2 Tractor Feed (Continuous paper)......................................1-10
1.3.3.3 Paper Feed Speed and Accuracy......................................1-10
1.3.4 Paper Specification.....................................................................1-11
1.3.5 Printable Area..............................................................................1-17
1.3.6 Paper Thickness Detection ........................................................1-24
1.3.7 Ribbon Cartridge.........................................................................1-25
1.3.7.1 Monochrome ribbon cartridge............................................1-25
1.3.7.2 Color ribbon cartridge........................................................1-25
1.3.8 Input Data Buffer .........................................................................1-26
1.3.9 Electric Specifications................................................................1-26
1.3.10 Safety Approvals .......................................................................1-26
1.3.11 CE Marking.................................................................................1-26
1.3.12 Acoustic Noise...........................................................................1-27
1.3.13 Reliability....................................................................................1-27
1.3.14 Environmental Conditions........................................................1-27

1.4 Interfaces ..............................................................................................1-28
1.4.1 Parallel Interface..........................................................................1-28
1.4.2 Serial Interface.............................................................................1-33
1.4.3 Optional Interface........................................................................1-34
1.4.4 Printer language..........................................................................1-35
1.4.5 Prevention Hosts from Data Transfer Time-out .......................1-36
1.4.6 Interface Selection ......................................................................1-36
1.5 Operation ..............................................................................................1-37
1.5.1 Control Panel...............................................................................1-37
1.5.1.1 Button Operations..............................................................1-37
1.5.1.2 Printer Status and LCD/LED Indicator Conditions.............1-39
1.5.1.3 Printer Status and Buzzer..................................................1-40
1.5.2 SelecType.....................................................................................1-41
1.5.2.1 SelecType Phase ..............................................................1-41
1.5.2.2 SelecType Operation.........................................................1-42
1.5.2.3 SelecType Option..............................................................1-43
1.5.3 Functions at Power On ...............................................................1-45
1.5.4 Bi-D Adjustment Mode................................................................1-46
1.5.5 Program Reload Mode................................................................1-46
1.5.6 Initialization..................................................................................1-47
1.5.6.1 Printer Initialization............................................................1-47
1.5.6.2 Initialize Defaults to the Standard......................................1-48
1.6 Main Components................................................................................1-49
1.6.1 C210MAIN Board.........................................................................1-49
1.6.2 C124PSB/PSE Board...................................................................1-50
1.6.3 Printer Mechanism......................................................................1-50
1.6.4 Housing........................................................................................1-51

Product Description
Rev. A 1-1
1.1 Features
The DLQ 3000+, equipped with a Bi-directional parallel interface, is the most advanced
EPSON 24-pin impact-dot printer. It prints on continuous multi-part form as well as on single
sheet, which makes the printer highly usable in office environment . The main features of
this printer are:
 Used in Network environment with parallel interface supported
 Memory
 CSF paper quantity sensor
 Paper jam detection
 Enhanced duplex printing
 1 original plus 6 duplications in the copy mode
 Wide printable area
 70 line / A4 (0 mm can be set for the top and bottom margins at single print mode.)
 Paper thickness detection function supported
 Enables the auto and manual platen gap adjustment
 Fonts
 Bitmap fonts: 9 LQ and 1 draft typefaces
 Scalable fonts: 4 typefaces
 Bar-code fonts: 8 typefaces
 Character tables
 Standard version: 11 tables
 NLSP version: 30 tables
 Control codes
 ESC/P2
 IBM 2391 Plus Emulation
 Input buffer
 128 K byte
 Interface
 Bi-directional parallel interface (IEEE-1284 nibble mode supported)
 Serial interface (EIA-232D)
 Type-B interface level 2 (Optional)
 Reliability
 Total print volume: 9 million lines
 Printhead life: 200 million strokes
 Ribbon life: 6 million characters

DLQ-3000+
Rev. A
1-2
Printer Cover
Rear Paper Guide
Control Panel
Knob
Paper Bail
Right Guide Edge
Right Guide Edge Lock
Printhead
Front Paper Guide
Left Guide Edge
Left Guide Edge Lock
Power Switch
Paper Thickness Adjust Lever
Ribbon Cartridge
Paper Support
Release Lever
Tractor Unit
Parallel Interface
Serial Interface
Figure 1-1. Exterior View of DLQ 3000+