®
SERVICE MANUAL
9-pin Serial Impact Dot Matrix Printer
EPSON LX-300+
SEDM997003
Notice:
All rights reserved. No part of this manual may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic,
mechanical, photocopying, recording, or otherwise, without the prior written permission of SEIKO EPSON CORPORATION.
The contents of this manual are subject to change without notice.
All effort 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 not withstanding SEIKO EPSON CORPORATION 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 purpose only and may be trademarks or registered trademarks of their
respective owners. EPSON disclaims any and all rights in those marks.
Copyright © 2000 SEIKO EPSON CORPORATION. Printed in Japan.
PRECAUTIONS
Precautionary notations throughout the text are categorized relative to 1) Personal injury and 2) damage to equipment.
W ARNING
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
WARNING heading.
CAUTION
Signals a precaution which, if ignored, could result in
damage to equipment.
DANGER
1. ALWAYS DISCONNECT THE PRODUCT FROM THE POWER SOURCE AND PERIPHERAL DEVICES PERFORMING ANY MAINTENANCE OR REPAIR
PROCEDURES.
2. NOWORK 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.
WARNING
1. REPAIRS ON EPSON PRODUCT SHOULD BE PERFORMED ONLY BY AN EPSON CERTIFIED REPAIR TECHNICIAN.
2. MAKE CERTAIN THAT THE SOURCE VOLTAGES 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.
PREFACE
This manual describes basic functions, theory of electrical and mechanical operations, maintenance and repair procedures of LX-300+. The instructions and
procedures included in here are intended for the experienced repair technicians, and close attention should be given to the precautions on the preceding page.
Chapters are organized as follows:
CHAPTER 1. PRODUCT DESCRIPTIONS
Provides a general overview and specifications of the product.
CHAPTER 2. OPERATING PRINCIPLES
Describes the theory of electrical and mechanical operations of the product.
CHAPTER 3. TROUBLESHOOTING
Provides the step-by-step procedures for troubleshooting.
CHAPTER 4. DISASSEMBLY AND ASSEMBLY
Describes the step-by-step procedures for disassembling and assembling the
product.
CHAPTER 5. ADJUSTMENT
Provides adjusting procedures.
CHAPTER 6. MAINTENANCE
Provides preventive maintenance procedures.
APPENDIX
Provides the following addition information for reference:
- Connector Summary
- Parts List
- Exploded Diagrams
- Component Layout
- Circuit Schematics
Revision Status
Revision Date of Issue Description
A May 11, 2000 First Release
Contents
Chapter 1 Product Description
1.1 Features .............................................................................................. 9
1.2 Printing Specification ...................................................................... 10
1.2.1 Printing Specification ................................................................. 10
1.2.2 Paper Feeding ........................................................................... 13
1.2.3 Electrical Specification .............................................................. 14
1.2.4 Environmental Condition ........................................................... 14
1.2.5 Reliability ................................................................................... 14
1.2.6 Ribbon Cartridge ....................................................................... 14
1.2.7 Safety Approvals ....................................................................... 15
1.2.8 CE Marking ................................................................................ 15
1.2.9 Acoustic noise: .......................................................................... 15
1.2.10 Printable Area .......................................................................... 16
1.3 Interface Specifications .................................................................. 19
1.3.1 Parallel Interface (Forward Channel) ........................................ 19
1.3.2 Parallel Interface (Reverse Channel) ........................................ 21
1.3.3 Serial Interface .......................................................................... 22
1.3.4 Interface Selection ..................................................................... 23
1.3.5 Prevention Hosts from Data Transfer Time-out ......................... 23
1.3.6 IEEE1284.4 protocol ................................................................. 23
1.4 Operation .......................................................................................... 24
1.4.1 Control Panel ............................................................................. 24
1.4.1.1 Switches ............................................................................. 24
1.4.1.2 LED .................................................................................... 25
1.4.1.3 Buzzer ................................................................................ 25
1.4.2 Functions ................................................................................... 26
1.4.2.1 Usual Operation ................................................................. 26
1.4.2.2 Operation at Power-on ....................................................... 26
1.4.2.3 Default Setting .................................................................... 26
1.4.2.4 Bi-d. Adjustment ................................................................. 28
1.4.3 Errors ......................................................................................... 28
1.5 Control codes .................................................................................. 29
1.5.1 ESC/P2 ...................................................................................... 29
1.5.2 IBM 2390 Plus Emulation .......................................................... 30
1.5.3 Bi-Directional Commands ......................................................... 31
1.5.3.1 Reply Printer Status ........................................................... 33
1.5.3.2 Packet commands .............................................................. 34
1.6 Initialization ...................................................................................... 35
1.7 Paper Specifications ....................................................................... 36
1.8 Physical Specifications .................................................................. 39
1.9 Accessories ..................................................................................... 40
Chapter 2 Operating Principles
2.1 Overview .......................................................................................... 42
2.2 Printer Mechanism (M-3M10) .......................................................... 43
2.2.1 Printhead ................................................................................... 44
2.2.1.1 Buzzer Function ................................................................. 44
2.2.2 Carriage Mechanism ................................................................. 45
2.2.2.1 High speed skip method ..................................................... 47
2.2.3 Ribbon Mechanism ................................................................... 47
2.2.3.1 Ink Ribbon Shifting Mechanism .......................................... 47
2.2.3.2 Color Ribbon Driving Mechanism (Option) ......................... 47
2.2.4 Platen Gap Adjustment Mechanism .......................................... 49
2.2.5 Paper Feed Mechanism ............................................................ 50
2.2.5.1 Page Length Measurement ................................................ 51
2.2.6 Release Mechanism .................................................................. 52
2.2.7 Other Special Functions ............................................................ 52
2.2.7.1 Energy saving mode ........................................................... 52
2.2.7.2 Quiet Mode ......................................................................... 52
2.3 Electric Circuit Operating Principles ............................................. 53
2.3.1 MAIN Board (Control Board) Electric Circuit ............................. 53
2.3.2 C294PSB / C294PSE Board ..................................................... 54
2.3.2.1 Electric Circuit .................................................................... 54
Chapter 3 Troubleshooting
4.2.7.12 Paper Guide Removal ...................................................... 81
3.1 Overview ........................................................................................... 56
3.2 Troubleshooting .............................................................................. 57
3.2.1 Initialization Check .................................................................... 57
3.2.2 Check Performance By Self-Check Function ............................ 57
3.2.2.1 Indicator LED ...................................................................... 57
3.2.3 Identify Problems From Symptoms ........................................... 58
3.2.4 Unit and Parts Check ................................................................ 61
3.2.4.1 Printhead Check ................................................................. 61
3.2.4.2 Motor Check ....................................................................... 62
3.2.4.3 Sensor Check ..................................................................... 62
3.2.4.4 Printhead Driver Check ...................................................... 63
Chapter 4 Disassembly and Assembly
4.1 Overview ........................................................................................... 65
4.1.1 Precautions ............................................................................... 65
4.1.2 Tools .......................................................................................... 65
4.1.3 Service Checks After Repair ..................................................... 66
4.2 Disassembly and Assembly ........................................................... 67
4.2.1 Printhead Removal .................................................................... 68
4.2.2 Upper Housing Removal ........................................................... 69
4.2.3 Printer Mechanism Removal ..................................................... 70
4.2.4 Board Assembly and Panel Removal ........................................ 71
4.2.5 C294MAIN Board Assembly Removal ...................................... 71
4.2.6 P/S Board Assembly Removal .................................................. 72
4.2.7 Printer Mechanism Disassembly ............................................... 73
4.2.7.1 CR Motor Assembly Removal ............................................ 73
4.2.7.2 Platen Removal .................................................................. 74
4.2.7.3 Carriage Unit Removal ....................................................... 75
4.2.7.4 Ribbon Feed Mechanism Removal .................................... 76
4.2.7.5 RPE Sensor Removal ........................................................ 77
4.2.7.6 BPE Sensor Removal ......................................................... 77
4.2.7.7 HP Sensor Removal ........................................................... 77
4.2.7.8 PG Sensor Removal ........................................................... 78
4.2.7.9 Release Lever Position Sensor Removal ........................... 78
4.2.7.10 PF Motor Assembly Removal ........................................... 79
4.2.7.11 Paper Feed Mechanism Disassembly .............................. 79
Chapter 5 Adjustment
5.1 Overview .......................................................................................... 83
5.1.1 Platen Gap Adjustment ............................................................. 83
5.1.2 Bi-D Adjustment ........................................................................ 84
Chapter 6 Maintenance
6.1 Maintenance ..................................................................................... 89
6.1.1 Cleaning .................................................................................... 89
6.1.2 Lubrication ................................................................................. 89
Chapter 7 Appendix
7.1 Connector Summary ....................................................................... 94
7.2 Parts List .......................................................................................... 97
7.3 Exploded Diagrams ....................................................................... 100
7.4 Component Layout ....................................................................... 102
7.5 Circuit Schematics ........................................................................ 103
PRODUCT DESCRIPTION
CHAPTER
1
LX-300+ Revision A
1.1 Features
EPSON LX-300+ is a 9-pin serial impact dot matrix printer. The major features
of this printer are as follows:
Printing speed: High speed draft 300 cps at 10 cpi
Draft 225 cps at 10 cpi
NLQ 56 cps at 10 cpi
Feeding method: Friction feed (rear)
Push tractor feed (rear)
Push and Pull tractor feed (rear)
Pull tractor feed (rear, bottom)
Feeder: Rear push tractor, CSF single-bin (Option),
Pull tractor (Option) and Roll paper holder (Option)
Paper/ Media: Single sheet, Continuous paper, Multi part paper,
Envelope, Label and Roll paper
Fonts: 2NLQ and 1 Draft Bitmap typefaces
8 Barcode fonts
Character tables: Standard version 13 tables
NLSP version 38 tables
Input buffer: 8 Kbytes
Acoustic noise: 49 dB(A) (ISO 7779 pattern)
Reliability: Total print volume 12 million lines
(except printhead)
MTBF 6000 POH (25% Duty)
Printhead life 200 million strokes/ wire
Ribbon life 3 million characters
Paper guide cover
Printer cover
Control panel
Parallel interface
Figure 1-1. EPSON LX-300+ Printer Parts
Tractor
Paper cord
Paper supports
Paper guide
Paper release lever
Knob
Ribbon cartridge
Paper thickness
lever
Paper tension unit
Power switch
Interface: Bi-directional parallel interface
(IEEE-1284 nibble mode supported)
Serial I/F
Control code: ESC/P and IBM 2380 Plus emulation
Copy capability: 1 original + 4 copies
Control panel functions:Font, Pause, Tear off, LF/FF, Load/ Eject, Micro
Adjust, Self test, Data dump and the default settings
Product Description Features 9
LX-300+ Revision A
1.2 Printing Specification
1.2.1 Printing Specification
Print method: Impact dot matrix
Number of pins: 9 pins
Print pin arrangement: 9x1
Print pin diameter: 0.29 mm (0.0114 inch)
Color (Option): Black, Magenta, Cyan, Yellow
Print direction: Bi-direction with logic seeking
Print speed and printable columns:
Table 1-1. Print Speed and Printable Columns
Printing mode
High speed draft 10 80 300
High speed draft
condensed
Draft 10 8- 225
Draft condensed 17 137 191
Draft emphasized 10 80 112
Character pitch
(cpi)
12 96 337
15 120 337
17 137 321
20 160 300
12 96 270
15 120 225
20 160 225
Printable
columns
Printing speed
(cps)
Table 1-1. Print Speed and Printable Columns
Printing mode
NLQ 10 80 56
Character pitch
(cpi)
12 96 67
15 120 56
17 137 47
20 160 56
NOTE: When the power supply voltage drops to the lower limit, the
printer stops printing and then starts printing the rest on the
line more slowly than before.
Resolution:
Printable
columns
Printing speed
(cps)
Table 1-2. Resolution
Printing mode
High speed draft 90 72 No
Draft 120 72 No
Draft condensed 240 72 No
Draft emphasized 120 72 Yes
NLQ 240 144 No
Bit image 60, 72, 80, 90 or 120 72 Yes
Horizontal density
(dpi)
120 or 240 72 No
Vertical density
(dpi)
Adjacent dot print
Control code: ESC/P and IBM 2380 Plus emulation
(Refer to 1.5 "Control codes")
Product Description Printing Specification 10
LX-300+ Revision A
Character tables:
Standard version (13 character table)
Italic table PC437 (US, Standard Europe)
PC850 (Multilingual) PC860 (Portuguese)
PC863 (Canadian-French) PC865 (Nordic)
PC861 (Icelandic) BRASCII
Abicomp Roman 8
ISO Latin 1 PC858
ISO 8859-15
NLSP version (38 character tables)
Italic table PC437 (US, Standard Europe)
PC850 (Multilingual) PC437 Greek
PC853 (Turkish) PC855 (Cyrillic)
PC852 (East Europe) PC857 (Turkish)
PC866 (Russian)
PC869 (Greek) MAZOWIA (Poland)
Code MJK (CSFR) ISO 8859-7 (Latin / Greek)
ISO Latin 1T (Turkish) Bulgaria (Bulgarian)
PC 774 (LST 1283:1993) Estonia (Estonia)
ISO 8859-2 PC 866 LAT. (Latvian)
PC 866 UKR (Ukrania) PC860 (Portuguese)
PC 861 (Icelandic) PC865 (Nordic)
PC APTEC (Arabic) PC708 (Arabic)
PC 720 (Arabic) PCAR864 (Arabic)
PC863 (Canadian-French) Abicomp
BRASCII Roman 8
ISO Latin 1 Hebrew 7
Hebrew 8
PC858 IAO8859-15
PC771 (Lithuania)
International character sets: 13 countries
U.S.A France Germany
U.K. Denmark 1 Sweden
Italy Spain 1 Japan
Norway Denmark 2 Spain 2
Latin America
NOTE: The international and legal characters are the following
12 codes;
23H, 24H, 40H, 5BH, 5CH, 5DH, 5EH, 60H, 7BH, 7CH, 7DH,
7EH.
Typeface
Bit map fonts:
EPSON Draft 10cpi, 12cpi, 15cpi
EPSON Roman 10cpi, 12cpi, 15cpi, Proportional
EPSON Sans serif 10cpi, 12cpi, 15cpi, Proportional
EPSON OCR-B 10cpi
NOTE: *1: Do not describe in manual.
Bar codes
EAN-13 EAN-8 Interleaved 2 of 5
UPC-A UPC-E Code 39
Code 128 POSTNET Coda bar (NW-7)
Industrial 2 of 5
*1
*1
PC862 (Hebrew)
*1
NOTE: *1: Do not describe in manual.
*1
Matrix 2 of 5
*1
*1
*1
NOTE: *1: This item is not displayed on a default setting
mode. Do not describe this in the manual.
Product Description Printing Specification 11
LX-300+ Revision A
Character tables and typefaces:
Table 1-3. Character Tables and Typefaces
Standard
version
Table 1-3. Character Tables and Typefaces
Character table Bitmap font
Italic table
PC 437 (US, Standard Europe)
PC 850 (Multilingual)
PC 860 (Portuguese)
PC 863(Canadian-
French)
PC 865 (Nordic)
PC 861 (Icelandic)
BRASCII
Abicomp
Roman 8
ISO Latin 1
PC 858
ISO 8859-15
EPSON Draft
EPSON Roman
EPSON Sans serif
EPSON OCR-B
EPSON Draft
EPSON Roman
EPSON Sans serif
Character table Bitmap font
NLSP
version
Italic table
PC 437(US, Standard Europe)
PC 860(Portuguese)
PC 865(Nordic)
BRASCIl
Roman 8
PC437 (Greek)
PC 855 (Cyrillic)
PC 857 (Turkish)
PC 869 (Greek)
Code MJK (CSFR)
lSO Latin 1T (Turkish)
PC774 (LST 1283: 1993)
1SO 8859-2
PC 866 UKR (Ukrania)
PC 708 (Arabic)
PCAR864 (Arabic)
Hebrew 8*
PC 858
PC771 (Lithuania)
1
PC 850 (Multilingual)
PC 861 (Icelandic)
PC863 (Canadian-
French)
Abicomp
lSOLatin1
PC 853 (Turkish)
PC 852 (East Europe)
PC 866 (Russian)
MAZOWIA (Poland)
lSO 8859-7 (Latin/
Greek)
Bulgaria (Bulgarian)
Estonia (Estonia)
PC 866 LAT. (Latvian)
PC APTEC (Arabic)
PC 720 (Arabic)
Hebrew7*
PC862 (Hebrew)*
ISO 8859-15
EPSON Draft
EPSON Roman
EPSON Sans serif
EPSON OCR-B
EPSON Draft
EPSON Roman
EPSON Sans serif
1
1
NOTE: ESC R command is effective on all the character tables.
NOTE: *1: These items are not displayed in the default setting
mode. Do not describe in the manual.
Product Description Printing Specification 12
LX-300+ Revision A
1.2.2 Paper Feeding
Feeding method: Friction feed (rear)
Push tractor feed (rear)
Push and Pull tractor feed (rear)
Pull tractor feed (rear, bottom)
Feeder: Rear push tractor, CSF single-bin (Option),
Pull tractor (Option) and Roll paper holder (Option)
Paper path: Manual insertion Rear in, top out
CSF Rear in, top out
Push Tractor Rear in, top out
Pull Tractor Rear or bottom in, top out
Line spacing: 4.23mm (1/6 inch) or programmable
in increments of 0.118mm (1/216 inch)
Feed speed: 4.23mm (1/6 inch feed) 88msec
Continuous feed 0.76MPS (m/sec)
[3.0 IPS (inches/sec)]
Input Data Buffer: 8 Kbyte
Release lever:
The release lever must be set according to the following table;
Table 1-4. Release Lever
Lever position Paper path/ Feeder Paper/ Media
Friction Manual insertion (rear) Cut sheet (Single sheet and
Multi part)
Envelop
CSF single-bin Cut sheet (Single sheet)
Table 1-4. Release Lever
Lever position Paper path/ Feeder Paper/ Media
Tractor Push tractor feed (rear) Continuous paper (Single
sheet and Multi part)
Push and Pull tractor feed
(rear)
Pull tractor feed (rear) Continuous paper (Single
Pull tractor feed (bottom) Continuous paper (Single
Continuous paper (Single
sheet and Multi part)
sheet and Multi part)
sheet and Multi part)
Labels
Paper thickness lever:
The paper thickness lever must be set at the proper position as shown
below.
Table 1-5. Paper Thickness Lever
Lever
position
0 (0.0024) (0.0071) over 0.06 up to 0.18
1 (0.0071) (0.0102) over 0.18 up to 0.26
2 (0.0102) (0.0130) over 0.26 up to 0.33
3 (0.0130) (0.0154) over 0.33 up to 0.39
4 (0.0154) (0.0205) over 0.39 up to 0.52
Paper thickness (inch)
Paper thickness (mm)
Minimum Maximum
Roll paper holder feed (rear) Roll paper
Product Description Printing Specification 13
LX-300+ Revision A
1.2.3 Electrical Specification
120 V version
Rated voltage: AC 120V
Input voltage range: AC 99 to 132 V
Rated frequency range: 50 to 60 Hz
Input frequency range: 49.5 to 60.5 Hz
Rated current: 0.6A (max. 1.4A)
Power consumption: approx. 23W (ISO/IEC 10561 Letter pattern)
Insulation resistance: 10MΩ min.
(between AC line and chassis, DC 500V)
Dielectric strength: AC 1000 Vrms. 1 min. or
AC 1200 Vrms. 1 sec.
(between AC line and chassis)
230 V version
Rated voltage range: AC 220 to 240 V
Input voltage range: AC 198 to 264 V
Rated frequency range: 50 to 60 Hz
Input frequency range: 49.5 to 60.5 Hz
1.2.4 Environmental Condition
Temperature: 5 to 35 °C (operating
15 to 25
-30 to 60
Humidity: 10 to 80% RH (operating
30 to 60% RH (operating
0 to 85% RH (non-operating)
C (operating
°
C (non-operating)
°
Resistance to shock: 1 G, within 1ms (operating)
2 G, within 2ms (non-operating
Resistance to vibration: 0.25 G, 10 to 55 Hz (operating)
0.50 G, 10 to 55 Hz (non-operating
*1: without condensation
*2: during printing on multi part paper, envelop, card, or label
*3: without shipment container
*
1
)
*1,*
2
)
1
*
*1,*
)
2
)
1.2.5 Reliability
Total print volume:12 million lines (except printhead)
MTBF: 6000 POH
Printhead life: 400 million strokes / wire (Black)
100 million strokes / wire (Color)
3
)
*
3
)
*
Rated current: 0.3 A (max. 0.7A)
Power consumption: approx. 23W (ISO/IEC10561 Letter pattern)
Insulation resistance: 10MΩ min.
(between AC line and chassis, DC 500V)
Dielectric strength: AC 1500 Vrms. 1 min.
(between AC line and chassis)
1.2.6 Ribbon Cartridge
Type: Fabric
Color: Black
Ribbon life: 3 million characters
(Draft 10 cpi, 14 dots/character)
Type: Fabric
Color: Black, Magenta, Cyan and Yellow
Ribbon life:
Black 1 million characters (Draft 10 cpi, 14 dots/character)
Magenta 0.7 million characters (Draft 10 cpi, 14 dots/character)
Cyan 0.7 million characters (Draft 10 cpi, 14 dots/character)
Product Description Printing Specification 14
LX-300+ Revision A
Yellow 0.5 million characters (Draft 10 cpi, 14 dots/character)
1.2.7 Safety Approvals
120 V version
Safety standards: UL1950
CSA C22.2 No. 950
EMI: FCC part15 subpart B class B
CSA C108.8 class B
230 V version
Safety standards: EN60950 (VDE)
EMI: EN55022 (CISPR pub.22) class B
AS/NZS 3548 class B
1.2.8 CE Marking
230 V version and UPS version
Low voltage directive 73/23/EEC: EN60950
EMC Directive 89/336/EEC: EN55022 class B
EN61000-3-2
EN61000-3-3
EN50082-1
IEC801-2
IEC801-3
IEC801-4
1.2.9 Acoustic noise:
Level: 49 dB(A) (ISO 7779 pattern)
Product Description Printing Specification 15
LX-300+ Revision A
1.2.10 Printable Area
Cut sheets
P rintable A rea
Table 1-6. Printable Area for Cut Sheet
Single Sheet Multi Part
PW (Width) Refer to 1.7 "Paper
Specifications"
PL (Length) Refer to 1.7 "Paper
Specifications"
LM (Left Margin) When PW<=229 mm:
3 mm or more
When PW=257 mm:
24mm or more
RM (Right Margin) When PW<=229 mm:
3 mm or more
When PW=257 mm:
24mm or more
TM (Top Margin) 4.2 mm or more 4.2 mm or more
BM (Bottom Margin) 4.2 mm or more 4.2 mm or more
NOTE: The maximum horizontal printable area is 203.2mm.
Refer to 1.7 "Paper
Specifications"
Refer to 1.7 "Paper
Specifications"
When PW<=229 mm:
3 mm or more
When PW=257 mm:
24mm or more
When PW<=229 mm:
3 mm or more
When PW=257 mm:
24mm or more
Figure 1-2. Printable Area for Cut Sheet
Product Description Printing Specification 16
LX-300+ Revision A
Printable Area
P erforation
P erforation
Envelop
LM
P rintable A rea
Figure 1-3. Printable Area for Envelop
Table 1-7. Printable Area for Envelop
Envelope Printable Area
PW (Width) Refer to 1.7 "Paper Specifications"
PL (Length) Refer to 1.7 "Paper Specifications"
LM (Left Margin) 3 mm or more
RM (Right Margin) 3 mm or more
TM (Top Margin) 4.2 mm or more
BM (Bottom Margin) 4.2 mm or more
NOTE: The maximum horizontal printable area is 203.2mm.
BM
TM
RM
Continuous paper
Figure 1-4. Printable Area for Continuous Paper
Table 1-8. Printable Area for Continuous Paper
Continuous Paper
PW (Width) Refer to 1.7 "Paper Specifications"
PL (Length) Refer to 1.7 "Paper Specifications"
LM (Left Margin) When PW<=254mm:
13 mm or more
When PW=254 mm:
24mm or more
RM (Right Margin) When PW<=254mm:
13 mm or more
When PW=254 mm:
24mm or more
TM (Top Margin) 4.2 mm or more
BM (Bottom Margin) 4.2 mm or more
NOTE: The maximum horizontal printable area is 203.2mm.
Product Description Printing Specification 17
LX-300+ Revision A
PW
Roll paper
LM
BM
P rintable A rea
Figure 1-5. Printable Area for Roll Paper
TM
BM
Table 1-9. Printable Area for Roll Paper
Continuous Paper
PW (Width) Refer to 1.7 "Paper Specifications"
PL (Length) Refer to 1.7 "Paper Specifications"
LM (Left Margin) 3 mm or more
RM (Right Margin) 3 mm or more
TM (Top Margin) 4.2 mm or more
BM (Bottom Margin) 4.2 mm or more
Product Description Printing Specification 18
LX-300+ Revision A
1.3 Interface Specifications
LX-300+ provides bi-directional 8 bit parallel interface and serial interface.
Optional interface board is not supported on this model.
1.3.1 Parallel Interface (Forward Channel)
Transmission mode: 8 bit parallel
IEEE-1284 compatibility mode
Adaptable connector: 57-30360 (Amphenol) or equivalent
Synchronization: -STROBE pulse
Handshaking: BUSY and -ACKLG signals
Signal level: TTL compatible
(IEEE-1284 level 1 device)
Figure 1-6. Data Transmitting Timing
Table 1-10. Parameter
Parameter Minimum Maximum Condition
*-- 5.5V
V
OH
VOL* -0.5V --
IOH*--0.32mAV
IOL* -- 12mA VOL=2.4V
C
O
V
IH
V
IL
I
IH
I
IL
C
I
-- 50pF
-- 2.0V
0.8V --
-- 0.32mA VIH=2.0V
-- 12mA VIL=0.8V
-- 50pF
* Logic-H signal is 2.0V or lower when the printer is off and the signal is 3.0V
or higher when the printer is on. The receiver has impedance which is
equivalent to 7.5 k
Ω
.
OH
=2.4V
Table 1-11. Maximum & Minimum Timings for Data Transmission
Parameter Minimum Maximum
t
setup
t
hold
t
stb
t
ready
t
busy
t
reply
ack
t
t
nbusy
t
next
t
* -- 120 nsec
tout
t
** -- 200 nsec
tin
* Rise and fall time of output signals
** Rise and fall time of input signals.
500 nsec --
500 nsec --
500 nsec --
0 --
-- 500 nsec
-- --
500 nsec 10 us
0 --
0--
Product Description Interface Specifications 19
LX-300+ Revision A
BUSY signal is active (HIGH level) under the conditions below:
In the process of receiving data
In the condition of being input buffer full
In the condition of being -INT signal active (low level)
During hardware initialization
In the condition of being -ERROR or PE signal is active (low level, high
level, respectively)
In the self test mode
In the adjustment mode
In the default-setting mode
-ERROR signal is active (low level) under the conditions below:
In the condition of a paper-out error
In the condition of a release lever error
PE signal is active (high level) under the condition below:
In the condition of a paper-out error
Pin
No.
Table 1-12. Connector Pin Assignment and Signals
Signal
Name
8 DATA7 26 In bit6
9 DATA8 27 In bit7:MSB
10 -ACKNLG 28 Out
11 BUSY 29 Out
12 PE 28 Out
13 SLCT 28 Out
14 -AFXT 30 In Not used.
31 -INIT 30 In
Return
GND
Pin
In/Out Functional Description
This signal (negative pulse) indicates
that the printer has received data and is
ready to accept next one.
This signal’s high level means that the
print is not ready to accept data.
This signal’s high level means that the
printer is in a state of paper-out error.
Always at high level when the printer is
powered on.
This signal’s negative pulse initializes
printer.
Table 1-12. Connector Pin Assignment and Signals
Pin
No.
Signal
Name
1 -STROBE 19 In
2 DATA1 20 In
3 DATA2 21 In bit1
4 DATA3 22 In bit2
5 DATA4 23 In bit3
6 DATA5 24 In bit4
7 DATA6 25 In bit5
Return
GND
Pin
In/Out Functional Description
Strobe pulse. Input data is latched at
falling edge of the signal.
Parallel input data to the printer.
bit0:LSB
32 -ERROR 29 Out
36 -SLIN 30 In Not used.
18 Logic H -- Out
35 +5V -- Out
17 Chassis -- -- Chassis GND.
16, 33,
19-30
15, 34 NC -- -- Not connected.
GND -- -- Signal GND.
NOTE: In/Out shows the direction of signal flow from the printer’s
point of view.
This signal’s low level means the printer
is in a state of error.
This line is pulled up to +5V through
3.9 kΩ resister.
This line is pulled up tp +5V through
1.0 kΩ resister.
Product Description Interface Specifications 20
LX-300+ Revision A
1.3.2 Parallel Interface (Reverse Channel)
Transmission mode: IEEE-1284 nibble mode
Adaptable connector: See 1.3.1 "Parallel Interface (Forward
Channel)"
Synchronization: Refer to the IEEE-1284 specification
Handshaking: Refer to the IEEE-1284 specification
Signal level: IEEE-1284 level 1 device
See 1.3.1 "Parallel Interface (Forward Channel)"
Data transmission timing: Refer to the IEEE-1284 specification
Extensibility request: The printer responds to the extensibility
request affirmatively, when the request is 00H or 004H, which means;
00H: Request for nibble mode of reverse channel transfer
04H: Request device ID in nibble mode of reverse channel transfer
Device ID: The printer sends following device ID string when it is
requested.
When IEEE1284.4 is enabled;
Table 1-13.
[00H][4EH]
MFG: EPSON;
CMD: ESCPL2,PRPXL24,BDC,D4;
MDL: LX-300+;
CLS: PRINTER;
DES: EPSON[SP]LX-300+;
When IEEE1284.4 is disabled;
Table 1-14.
[00H][4BH]
MFG: EPSON;
CMD: ESCPL2,PRPXL24,BDC;
MDL: LX-300+;
CLS: PRINTER;
DES: EPSON[SP]LX-300+;
Table 1-15. Connector Pin Assignment and Signals
Pin
No.
Signal Name
1 HostClk 19 In Host clock signal.
2 DATA1 20 In
3 DATA2 21 In bit1
4 DATA3 22 In bit2
5 DATA4 23 In bit3
6 DATA5 24 In bit4
7 DATA6 25 In bit5
8 DATA7 26 In bit6
9 DATA8 27 In bit7:MSB
10 PtrClk 28 Out Printer clock signal.
11
12
13
14 HostBusy 30 In Host busy signal.
31 -INIT 30 In Not used.
32
36 1284-Active 30 In 1284 active signal.
18 Logic-H -- Out
PtrBusy/
DataBit-3,7
AckDataReq/
DataBit-2,6
Xflag/
DataBit-1,5
-DataAvail/
DataBit-0,4
Return
GND
Pin
29 Out
28 Out
28 Out
29 Out
In/Out Functional Description
Parallel input data to the printer.
bit0:LSB
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 reverse channel
transfer data bit 1 or 5.
Data available signal and reverse
channel transfer data bit 0 or 4.
This line is pulled up to +5V
through 3.9 kΩ resister.
Product Description Interface Specifications 21
LX-300+ Revision A
Table 1-15. Connector Pin Assignment and Signals
Connector: 25 pin subminiature D-shell connector (female)
Pin
No.
16, 33,
19-30
15, 34 NC -- -- Not connected.
Signal Name
35 +5V -- Out
17 Chassis -- -- Chassis GND.
GND -- --
Return
GND
Pin
In/Out Functional Description
This line is pulled up tp +5V
through 1.0 kΩ resister.
Signal GND.
* In/Out shows the direction of signal flow from the printer’s point of view.
1.3.3 Serial Interface
Synchronization: Asynchronous
Signal level: EIA-232D
MARK (logical 1): -3V to -25V
SPACE (logical 0): +3V to +25V
Word length: Start bit: 1 bit
Data bit: 8 bit
Parity bit: Odd, Even, Non, Ignore
Stop bit: 1 bit or more
Table 1-16. Connector Pin Assignment and Signals
Pin
No.
other NC -- Not used. Not connected.
* In/Out shows the direction of signal flow from the printer’s point of view.
Signal Name In/Out Functional Description
2 TXD Out Transmit data.
20 DTR Out
11 REV Out Connected directly to the DTR signal.
4 RTS Out
3 RXD In Receive data.
7 Signal GND -- Signal GND
1 Chassis GND -- Chassis GND
Indicates that the printer is ready to receive data
or not.
Request to send. Always SPACE level when the
printer is powered on. Pulled up to +12V via
4.7KΩ resistor.
Baud rate: 300, 600, 1200, 2400, 4800, 9600 or 19200 bps
Handshaking: DTR signal and XON/XOFF
DTR=MAEK, XOFF:indicates that the printer cannot receive data.
DTR=MARK, XON: indicates that the printer is ready to receive data.
NOTE: The DTR signal is MARK and XOFF code (DC3, 13H) is
transmitted when the rest of the input buffer becomes 256
bytes. The DTR signal is SPACE and XON code (DC1, 11H) is
transmitted when the rest of the input buffer is regained 256
byte.
Error handling: Parity error is only detected. Overrun error and
framing error are ignored.
Product Description Interface Specifications 22
LX-300+ Revision A
1.3.4 Interface Selection
The printer has 2 interfaces; the parallel interface and serial interface. These
interfaces are selected manually by Default Setting or selected automatically.
Manual Selection
One of 2 interfaces can be selected by Default setting.
Automatic Selection
The automatic interface selection is enabled by Default Setting. In this
automatic interface selection mode, the printer is initialized to the idle
state scanning which interface receives data when it is powered on.
Then the interface that receives data first is selected. When the host
stops data transfer and the printer is in stand-by state for the seconds
specified by Default Setting, the printer is returned to the idle state. As
long as the host sends data or the printer interface is in busy state, the
selected interface is let as it is.
Interface State and Interface Selection
When the parallel interface is not selected, the interface gets into a
busy state. When the serial interface is not selected, the interface
sends XOFF and sets the DTR signal MARK. When the printer is
initialized or returned to the idle state, the parallel interface got into a
ready state, the serial interface sends XON and sets the DTR SPACE.
Caution that the interrupt signal such as a -INIT signal on the parallel
interface is not effective while that interface is not selected.
Auto:
Communication is carried out in the conventional mode until a magic
string (1284.4 synchronous commands) is received. By receiving a
magic string, communication in IEEE1284.4 packet mode is started.
Off:
Communication is carried out in the conventional mode. A magic
string (284.4 synchronous commands) is discarded.
NOTE: The packet protocol of IEEE1284.4 allows a device to carry on
multiple exchanges or conversations which contain data and/
or control information with another device at the same time
across a single point-to-point link.
The protocol is not, however, a device control language. It
does provide basic transport-level flow control and
multiplexing services.
The multiplexed logical channels are independent of each and
blocking of one has no effect on the others. The protocol
operates over IEEE1284.
1.3.5 Prevention Hosts from Data Transfer Time-out
Generally, hosts abandons data transfer to peripherals when a peripheral is in
busy state for dozens of seconds continuously. To prevent hosts from this
kind of time-out, 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. At last, when the
input buffer is full, the printer is in busy state continuously.
1.3.6 IEEE1284.4 protocol
The packet protocol described by IEEE1284.4 is supported on the parallel I/F.
Two function modes of IEEE1284.4 protocol, “Off” and “Auto” are available,
and one of them is selected according to the value of Default setting. (See
1.4.2.3 "Default Setting")
Product Description Interface Specifications 23
LX-300+ Revision A
1.4 Operation
1.4.1 Control Panel
4 switches and 4 LEDs are on the panel as shown below.
Tear Off
Draft
Draft Condensed
Roman
Roman Condensed
Sans serif
Sans serif Condensed
: LED On
Tear Off
Font
: LED Blinks
: LED Off
Figure 1-7. Control Panel
LF/FF
Micro Adjust
Load/Eject
Paper Out
Pause
3 sec
1.4.1.1 Switches
Operation in normal mode
In normal mode, pressing panel switches executes following function;
Table 1-17. Operation in Normal Mode
Switch Function
-Alternates printing and non-printing status.
Pause
Load/Eject
LF/FF
Tear Off
Operation at power on
Turning the printer on while pressing panel switches executes the
functions below;
-Enables Micro Adjustment function and Font selection, holding it
down for 3 seconds.
-Loads or ejects paper.
-Execute micro feed forward, when this function is enabled.
-Executes line feed, pressing it shortly.
-Executes form feed, holding it down for a few seconds.
-Executes micro feed backward, when this function is enabled.
-Advances continuous paper to the Tear-off position.
-Select font, when this function is enabled.
Table 1-18. Operation at Power On
Switch Function
Load/Eject NLQ self test
LF/FF Draft self test
Tear Off Default setting
Load/Eject & LF/FF Data dump
Load/Eject & LF/FF & Pause Clear EEPROM
Tear Off & Load/Eject & LF/FF
Pause Bi-d adjustment
The others Not available
Clear EEPROM for Diving Line count for ribbon
change timing.
Product Description Operation 24
LX-300+ Revision A
Operation in default setting mode
The following switches are used in default setting mode;
Table 1-19. Operation at Power On
Switch Function
Tear Off Changes the setting.
LF/FF Selects the Menu.
The others Not available.
1.4.1.2 LED
Indication in normal mode
Table 1-20. Indication in normal mode
LED
Pause
Printer Status
Pause On --- ---
Paper out error On On ---
Release lever error On --- ---
Paper eject warning On Blink ---
Paper
*1
Out
*2
Font
*3 Font (Green)
-The status of Font selection is displayed by 2 Font LEDs when continuous
paper is out of the Tear-off position.
-Both LEDs blink when continuous paper is in the Tear-off position.
: Draft
: Draft Condensed
: Roman
: Roman Condensed
: Sans serif
: Sans serif Condensed
: Tear Off
(
: LED On, : LED Off, : LED Blinks)
1.4.1.3 Buzzer
Paper out error: Beeper sounds (...)*
Release lever operation: Beeper sounds(-----)*
Illegal panel operation: Beeper sounds (.)*
*The description (.) and (-) in the above shows how the beeper sounds.
(.): Beeper sounds approx. 100ms and interval is approx. 100ms.
(-): Beeper sounds approx. 500ms and interval is approx. 100ms.
Micro Adjust Blink --- ---
Tear off --- --- *3
Font selection --- --- *3
Fatal error Blink Blink Blink
*1 Pause (Orange)
-It is on when the printer is paused, and it is off when the printer is not
paused.
-It blinks when Micro Adjust is enabled.
*2 Paper Out (Red)
-It is on when the printer is in the Paper out status, and it is off when the
printer is out of this status.
Product Description Operation 25
LX-300+ Revision A
1.4.2 Functions
1.4.2.1 Usual Operation
Pause
-This switch alternates printer activity between printing and nonprinting.
-By holding it down over 3 seconds when the printer is in the stand by
state, the Micro Adjust function is enabled. By pressing it again, this
function is disabled.
Load/Eject
-Pressing it loads out sheet or continuous paper when the printer is
out of paper.
-Pressing it ejects out sheet to the stacker or continuous paper to the
paper park.
LF/FF
-Pressing it shortly executes line feed.
-Holding it down for a few seconds executes form feed when
continuous paper is used, or ejects cut sheet to the stacker when cut
sheet is used.
Tear Off
-When continuous paper is used, pressing it moves a page to the
Tear-off position. And pressing it again moves a next page to the TOF
position.
Font
-Pressing it selects one of the following fonts when Micro Adjust is
enabled;
Draft, Draft Condensed, Roman, Roman Condensed, Sans serif, Sans
serif Condensed
Micro Adjust
-Micro Adjust ↓ / ↑
function is enabled by Pause switch.
-Pressing the Micro Adjust
backward and forward by 0.118 mm (1/216 inch).
-The TOF adjustment is enabled in the TOF position after loading, and
the Tear-off adjustment is enabled in the Tear-off position.
switches is effective when the Micro Adjust
↓ / ↑
switches executes micro feed
1.4.2.2 Operation at Power-on
Self test
Prints the self test pattern. To cancel it, make printer pause and turn
off the power.
Default setting
Starts the default setting mode. See 1.4.2.3 "Default Setting".
Data Dump
Starts the data dump mode, in which all the input data are printed as
hexadecimal numbers and corresponding characters.
Clear EEPROM
Resets the printer to the factory default setting, which is not always
proper setting for each market demand.
(i.e. This function is for emergency.)
Clear Areal EEPROM data except 00H to 1FH.
Clear EEPROM for Driving Line count for ribbon change timing.
Resets the diving Line count for ribbon change timing.
Bi-d adjustment
Starts the Bi-d adjustment mode. See 1.4.2.4 "Bi-d. Adjustment".
Demonstration
Not available.
1.4.2.3 Default Setting
There are some parameters that can be changed by users and will be referred
at the time of initialization of the printer.
Setting mode
1. Enters the Default setting mode.
The method of selecting language for “Usage of this mode” is printed.
2. Select language for “Usage of this mode” by LF/FF button.
Font LEDs show the language for “Usage of this mode” that is currently
selected.
This section will be advanced one by one as the button is pressed and the
On/Off/Blink/2-Blink of those three LEDs will also be changed according to
the selection.
Product Description Operation 26
LX-300+ Revision A
3. Press Tear Off button.
The current setting and the “Usage of this mode” by selected language
will be printed on the paper set in the paper path at that time.
A print sample is shown in appendix A.
4. Select Menu by Tear Off button.
Font LEDs show the menu which is selected at that time. The selection
will be advanced one by one as the button is pressed and the
combination of those three LEDs status of On/Off/Blink/2-Blinks will be
changed according to the selection.
5. Select setting value by LF/FF button.
Tear Off/ Bin LEDs and Paper Out LED show that menu’s value by status
of On/Off/Blink/2-Blinks. That value can be changed by pressing Tear Off/
Bin button and the LEDs status of On/Off/Blink/2-Blinks will be changed as
the button is pressed.
6. When LF/FF button is pressed, the printer memorize the last setting value.
7. Repeat (4) to (6).
The other items can be changed in the same manner.
The menu selection will return to the first menu after the last menu
selection is over.
8. Turn the printer off.
The setting is stored into non-volatile memory.
Table 1-21. Setting Menu
Item Setting / Value *2
3 inch, 3.5 inch, 4 inch, 5.5 inch, 6 inch, 7 inch,
Page length for tractor
Skip over perforation OFF, ON
Auto tear off OFF, ON
Auto line feed OFF, ON
Print direction Bi-d., Uni-d., Auto
Software ESC/P2, IBM 2390 Plus
0 slash OFF, ON
8 inch, 8.5 inch, 11 inch
17 inch
, 70/6 inch, 12 inch, 14 inch,
Table 1-21. Setting Menu
Item Setting / Value *2
High speed draft OFF, ON
I/F mode Auto, Parallel, Option
Auto I/F wait time 10 seconds, 30 seconds
Parallel I/F bidirectional
mode
Packet mode Auto, OFF
Auto CR (IBM 2390 Plus) OFF, ON
A.G.M. (IBM 2390 Plus) OFF, ON
Character table Software version
International character set
for Italic table
Manual feed wait time 1 second, 1.5 seconds, 2 seconds, 3 seconds
Buzzer OFF, ON
Auto CR (IBM 2380 Plus)*1OFF, ON
IBM character table
*1
NOTE: *1: This setting is effective when IBM 2380 Plus emulation is
selected.
NOTE: Setting with underline mean the standard factory settings.
OFF, ON
Italic, PC437
BARASCII, Abicomp, Roman8, ISO Latin 1, PC858,
ISO 8859-15
NLSP version
Italic, PC437
PC852, PC857, PC864, PC866, PC869, MAZOWIA,
Code MJK, ISO 8859-7, ISO Latin 1T, Bulgaria,
PC774, Estonia, ISO 8859-2, PC 866 LAT., PC
866UKR, PC APTEC, PC708, PC720, PCAR 864,
PC860, PC865, PC861, PC863, BRASCII, Abicomp,
Roman8, ISO Latin 1, PC858, ISO 8859-15, PC771
Italic U.S.A.
U.K., Italic Denmark 1, Italic Sweden, Italic Italy,
Italic Spain 1
Table2, Table1
, PC850, PC860, PC863, PC865, PC861,
, PC850, PC437, Greek, PC853, PC855,
, Italic France, Italic Germany, Italic,
Product Description Operation 27
LX-300+ Revision A
1.4.2.4 Bi-d. Adjustment
Bi-d. adjustment can be adjusted by users. Bi-d. adjustment method is as
follows.
1. Turning the printer on while pressing Pause switch. The guide to adjust
Bi-d alignment in this mode and the first alignment pattern will be
printed.
2. Select the most closely aligned number by pressing LF/FF (
↑
Eject (
Font LEDs and Pause LED show the pattern number which is selected at
that time. The selection is advanced one by one as the switch is pressed,
and the combination of On/Off/Blink of those three LEDs is also changed
according to the selection.
3. Fix the selected number by pressing Tear Off switch.
Selected number is fixed and the next alignment pattern is printed.
4. Repeat step 2 to 3 until finishing Bi-d adjustment for NLQ mode.
Following adjustment is executed.
- Bi-d. adjustment for high speed draft mode
- Bi-d. adjustment for draft mode
- Bi-d. adjustment for NLQ mode
5. Turn the printer off.
The setting is stored into non-volatile memory.
) switches.
↓
) and Load/
1.4.3 Errors
Paper out error:
When the printer fails to feed a sheet, it goes a paper out error.
Release lever error:
When release lever position is wrong, it goes a release lever error.
Fatal errors:
Carriage control error and Power supply voltage error.
Product Description Operation 28
LX-300+ Revision A
1.5 Control codes
1.5.1 ESC/P2
Table 1-22. ESC/P2
Classification Operation Command
General Operation Initialize Printer ESC@
Unidirectional Printing ESC U
CSF Mode Control ESC EM
Paper feeding Form Feed FF
Line Feed LF
Line Spacing ESC 0, ESC 2, ESC3, ESC A
Carriage Return CR
Page format Page Length ESC C, ESC C0, ESC (C
Left / Right Margin ESC Q, ESC1
Top / Bottom Margin ESC N, ESC O, ESC (c
Define Unit ESC (U
Print position motion Horizontal Print Position ESC$, ESC
Vertical Print Position ESC (V, ESC (v
Tab Horizontally ESC D, HT
Tab Vertically ESC B, VT
¥
Table 1-22. ESC/P2
Classification Operation Command
Font enhancement Double-Width ESC W, DC4, SO
Condensed DC2, SI
Double-height ESC w
Double-Strike ESC G, ESC H
Super-/ Subscript ESC T, ESC S
Underline ESC-
Spacing Intercharacter Space ESC Space
Character handling Character Table ESC t, ESC (t
International Character ESC R
User-Defined Characters ESC%, ESC &, ESC:
Control code selection ESC1
Upper Control Codes ESC6, ESC7
Bit image
8 pin Bit Image
9 pin Bit Image ESC ^
Printing color Select color ESC r
Bar code Bar code ESC (B
Production EEPOM write, etc. ESC|
ESC K, ESC L, ESC Y, ESC Z,
ESC*
Advance paper ESC J
Font selection Typeface ESC k, ESC x, ESC y
Pitch ESC P, ESC M, ESC g, ESC p
Italic Font ESC 4, ESC 5
Bold Font ESC E, ESC F
Master Select ESC!
Product Description Control codes 29
LX-300+ Revision A
1.5.2 IBM 2390 Plus Emulation
Table 1-23. IBM 2390 Plus emulation
Classification Operation Command
General Operation Nop NUL, DC3
Off Line ESC j
Buzzer BEL
Cancellation CAN
Select / Deselect DC1, ESC Q
Initialize Printer ESC [K
Unidirectional Printing ESC U
Select Auto Sheet Feeder ESC [F
Paper feeding Form Feed FF
Line Feed,
Auto Line Feed
Line Spacing
Carriage Return CR
Reverse Line Feed ESC]
Page format Page Length ESC C, ESC C0
Left / Right Margin ESC X
Skip Over Perforation ESC N, ESC O
Set TOF ESC 4
Print position motion Horizontal Print Position ESC d
Initialize Tab Position ESC R
LF, ESC5
ESC A, ESC 0, ESC 1, ESC 2,
ESC3
Table 1-23. IBM 2390 Plus emulation
Classification Operation Command
Font selection Pitch DC 2, ESC P, ESC:
Bold Font ESC E, ESC F
Master Select ESC I
Print Quality ESC [d
Select Font and Pitch ESC [I
Font enhancement Double-Width DC4, SO, ESC SO, ESC W
Enlarge and Life Space ESC [@
Condensed SI, ESC SI
Double-Strike ESC G, ESC H
Super-/ Subscript ESC T, ESC S
Underline ESC -
Line / Score ESC_
Spacing Back Space BS
Space SP
Define Unit ESC [
Character handling Character Table ESC 6, ESC 7, ESC [T
Print Data as Characters ESC ^, ESC
Bit image Bit Image ESC K, ESC L, ESC Y, ESC Z
Bar code Set up Bar code ESC [f
Transfer Bar code ESC [p
Download Download ESC=(only Draft mode)
¥
¥
Tab Horizontally ESC D, HT
Tab Vertically ESC B, VT
Advance paper ESC J
Product Description Control codes 30
LX-300+ Revision A
1.5.3 Bi-Directional Commands
Reply printer ID
Reply printer ID: [ESC][SOH]@EJL[SP]ID[CR][LF]
The printer sends the following ID string in reply to this command.
Table 1-24.
@EJL[SP]ID[CR][LF]
MFG: EPSON;
CMD: ESCPL2,PRPXL24,BDC;
MDL: LX-300+;
CLS: PRINTER;
DES: EPSON[SP]LX-300+;
[FF]
Enter / Exit Remote Mode
Enter Remote Mode: [ESC](R[08H][00H][00H]REMOTE1
Exit Remote Mode: [ESC][NUL][00H][00H]
Remote Commands
Change Printer Settings: XX[nL][nH][00H][ml]...[mx]
Reply Printer Settings: XX[nL][nH][01H][ml]...[mx]
XX is a string of 2 ASCII characters of defining a feature of the command.
Following [nL][nH] is two byte hexadecimal value that denotes the length of
the [00H] and [ml]...[mx] parameters. Last [m1] ... [mx] parameters are used to
describe the detailed command function and represent printer settings.
<Remote commands>
-[Save] column shows that SV commands is effective to each feature or not.
{
-
: All parameters are saved., ∆: Some limited parameters are saved.,-: No
parameter is saved.
Table 1-25. Bi-Directional Commands
Function Code/ Parameter Save
Enter Remote-1 ESC”(R”08H 00H 00H “REMOTE1” -
Exit Remote-1 ESC 00H 00H 00H -
Save settings “SV” 00H 00H -
Initialize “RS” 00H 00H -
Load power-on default “LD” 00H 00H -
Select typeface “FO” 02H 00H 00H m1
m1=0(Roman), 1(Sans serif), 5(OCR-B)*1
Select character pitch “CP” 02H 00H 00H m1
m1=0(10cpi), 1(12cpi), 2(15cpi), 3 (17.1cpi),
4(20cpi), 5(Propotional)
Select draft or NLQ “CQ” 02H 00H 00H m1
m1=0(Draft), 1(LQ), 2(High speed draft)
Select character table “CT” 02H 00H 00H m1
m1=0 (Table0), 1(Table1)
Assign character table “AT” 04H 00H 00H m1 m2 m3
m1=0(Table0), 1(Table1)
m2, m3=(ESC/P2 Character Table No.)*4
∆
*2
{
{
∆
*3
∆
*3
The printer sends the following string in reply to the commands of this type:
@BDC[sp]PS[CR][LF]
XX: Reply-Data;
[FF]
Table 1-25 shows the XXs that are provided in this printer.
Select an international
character set
Turn 1 inch skip
perforation on/off
“IC” 02H 00H 00H m1
m1=0(U.S.A), 1(France), 2(Germany), 3(U.K.)
4(Denmark1), 5(Sweden), 6(Italy), 7(Spain1),
8(Japan), 9(Norway), 10(Denmark2),
11(Spain2), 12(Latin America)
“SK” 02H 00H 00H m1
m1=0(off), 1(on)
∆
*1 Don’t describe in manual.
*2 m1=0 to 1 only
*3 Only the following parameters are memorized. (Table 1-26)
Product Description Control codes 31
*5
{
LX-300+ Revision A
Table 1-26. Note for Table 1-25
m1 set by AT/CT m2 set by AT m3 set by AT
0 0 0
1 All parameters that can be set
*4 m2 and m3 apply to the following ID number. (See Table 1-27 & Table
1-28.)
Table 1-27. Std and NLSP ver.
m2 m3 Character table m2 m3 Character table
00H 00H Italic 19H 00H BRASCII
01H 00H PC437 1AH 00H Abicomp
03H 00H PC850 7FH 01H ISO Latin1
07H 00H PC860 23H 00H Roman8
08H 00H PC863 2CH 00H PC858
09H 00H PC865 1DH 0FH ISO 8859-15
18H 00H PC861
Table 1-28. NLSP only
m2 m3 Character table m2 m3 Character table
0EH 30H PC866 UKR 29H 00H PC 708
0FH 00H PC869 2AH 00H PC720
0DH 20H PCAR_864 7FH 02H ISO 8859-2
1BH 00H MAZOWIA 2DH 00H PC771
*5 m1=0 to 7 only
<Remote commands>
Table 1-29. Bi-Directional Commands
Function Code/ Parameter Save
Set page length “PG” 05H 00H 00H p1 p2 m1 m2
p1=0(Continuous paper), p2=0(Rear),
p1=1(CSF), p2=0(bin1)
p1=2(Manual insertion), p2=0(rear)
-Page legth=m1+256*m2,
0.118mm (1/216inch)
648 (76.2mm(3inch)) <= m1+256*m2 <=
4752(558.8mm(22 inch))
{
Table 1-28. NLSP only
m2 m3 Character table m2 m3 Character table
01H 10H PC437 Greek 1CH 00H Code MJK
05H 00H PC853 1DH 07H ISO 8859-7
06H 00H PC855 1FH 00H ISO Latin 1T
0AH 00H PC852 20H 00H Bulgaria
0BH 00H PC857 21H 00H Hebrew 7
0CH 00H PC862 22H 00H Hebrew 8
0DH 00H PC864 24H 00H PC 774
0EH 00H PC866 25H 00H Estonia
0EH 20H PC866 LAT. 28H 00H PC APTEC
Set Top margin “TP” 05H 00H 00H p1 p1 m1 m2
p1=0(Continuous paper), p2=0(Rear),
p1=1(CSF), p2=0(bin1)
p1=2(Manual insertion), p2=0(rear)
-Top margin=m1+256*m2,
0.118mm (1/216inch)
36 (4.2mm) <= m1+256*m2 <= 288 (8.5mm +
25.4mm(1inch))
Turn unidirectional
mode on/off
Turn auto tear-off on/off “TO” 02H 00H 00H m1
Turn auto line feed on/off “LF” 02H 00H 00H m1
“PD” 02H 00H 00H m1
m1=0(Bi-d.), 1(Uni-d.)
m1=0(off), 1(on)
m1=0(off), 1(on)
{
{
{
{
Product Description Control codes 32
LX-300+ Revision A
Table 1-29. Bi-Directional Commands
Function Code/ Parameter Save
Select control language “PM” 02H 00H 00H m1
m1=0(ESC/P), 2(IBM 238x Plus emulation)
Turn printer state reply
on/off
Turn Slash zero on/off “EX” 06H 00H 00H 00H 00H 00H 01H m1
Turn Buzzer on/off “EX” 06H 00H 00H 00H 00H 00H 02H m1
Turn IBM emulation Auto
CR on/off
Set starting data/month/
year
Inquire printer state reply
on/off
Echo parameters “??” nL nH 01H <chr-str>
Inquire starting date/
month/year
“ST” 02H 00H 00H m1
m1=0, 1, 2, 3
m1=0(off), 1(on)
m1=0(enable), 1(disable)
“EX” 06H 00H 00H 00H 00H 00H 04H m1
m1=0(off), 1(on)
“SD” 04H 00H 00H m1 m2 m3
00<=m1<=99, 01<=m2<=12, 01<=m3<=31
“ST” 01H 00H 01H
“@BDC” SP “PS” CR LF “ST:” <nn> “;” FF
“@BDC” SP “PS” CR LF “??:” <chr-str> “;” FF
“SD” 01H 00H 01H
“@BDC” SP “PS” CR LF “SD:” <nn1> <nn2>
<nn3>“;” FF
{
-
{
{
{
{
-
-
-
1.5.3.1 Reply Printer Status
The printer sends back one of the five strings shown below according to the
printer status at that time every few seconds.
“@BDC”SP “ST” CR LF
“ST:” <status code>”;”
[“ER:” <error code>”;”]
[“PP:”<paper_path>”;”]
[”CD:”<printer status codes>”;”]
[“IG:”<nn1><nn2><n3>[“,”...<nnx1><nnx2><nnx3>]”;”]
[“TEC:”<ii1>”;”]
FF
status_code
Table 1-30. Status_Code
Status “<status code>”
In the error state “00”
In the busy state “02”
In the waiting state “03”
In the idle state “04”
In the pose state “05”
Inquire total printing
lines/power on hours
“TL” 01H 00H 01H
“@BDC” SP “PS” CR LF “TL:” “;” “TPL:”
<nnnnnnnn2>
“;” “TPH:” <nnnn3>”;” “TPR:” <nnnnnnnn4>
“;” FF
-
error_code
Table 1-31. Error_Code
Error “<error code>”
Fatal error “00”
Port is not selected “01”
Release lever position error “03”
Paper out “06”
Product Description Control codes 33
LX-300+ Revision A
Paper_path
1.5.3.2 Packet commands
Table 1-32. Paper_Path
paper_path “<paper_path code>”
Continuous paper (rear) “0000”
Continuous paper (bottom) “0001”
Cut sheet (rear) “0200”
CSF Single bin “0100”
characteristic status code
Table 1-33. Characteristic Status Code
location size type Refer to
Structure version +0 2bytes “02” fixed -
Starting date +2 6bytes “yy”, “mm, “dd” “SD” command
Total printing line
number
Total power on hour +16 4bytes “nnnn” “TL” command
Total printing number
for ribbon charge
timing
+8 8bytes “nnnnnnnn” “TL” command
+20 8bytes “nnnnnnnn” “TL” command
Table 1-34. Packet Commands
Function Code
Device ID request “di” 01H 00H 01H
Device ID reply (*1) “@EJL” SP “ID” CR LF <Device ID string> FF
State-Reply request “st” 01H 00H 01H
State-Reply (*2) “@BDC” SP “ST” CR LF <printer status string> FF
No support
command
NOTE: (*1) The reply string is as same as BDC-ID Reply.
NOTE: (*2) The reply string is as same as BDC-ST Reply.
“XX:;” FF
(XX is the command string being invalid.)
MIB proxy information
“1G:”
“0305NA,” Sheet feeder bin 1 (removable), capacity 5mm,
quantity of paper N.A.
“09NANA,” Manual feed rear, capacity N.A., quantity of paper N.A.
“0CNANA;” Tractor rear, capacity N.A., quantity of paper N.A.
“TEC:06;” 9pin SIDM
Product Description Control codes 34
LX-300+ Revision A
1.6 Initialization
Power-on initialization
The initialization of this level is activated by power-on or cold-reset
command (remote RS command).
This initialization is;
to initialize the printer mechanism.
to execute Operator initialization.
Operator initialization
The initialization of this level is activated by -INT signal (negative
pulse).
This initialization is;
to clear the all buffers of data.
to cancel the download character definition.
to make the printer stand-by state, if no errors occur.
to execute Software initialization.
Software initialization
The initialization of this level is activated by the control code ESC@.
This initialization is;
to clear the unprinted data.
to make the printer’s setting defaults.
Product Description Initialization 35
LX-300+ Revision A
1.7 Paper Specifications
Cut sheet (multi part)
Cut sheet (single sheet, not multi part)
Table 1-35. Cut Sheet (single sheet, not multi part)
Manual insertion CSF single-bin
Minimum Maximum Minimum Maximum
Width
Length
Thickness
Weight
Quality
(inch)
(mm)
(inch)
(mm)
(inch)
(mm)
(g/m2)
(lb.)
(3.9)
100
(3.9)
100
(0.0025)
0.065
52
(14)
Plain paper, Reclaimed
paper
Not curled, not folded, not
crumpled
NOTE: Printing on reclaimed paper is available only under
normal temperature and humidity conditions.
(10.1)
257
(14.3)
364
(0.0055)
0.14
90
(24)
(7.2)
182
(10.1)
257
(0.0028)
0.07
64
(18)
Plain paper, Reclaimed
paper
Not curled, not folded, not
crumpled
(8.5)
216
(14.0)
356
(0.0055)
0.14
90
(24)
Table 1-36. Cut Sheet (Multi part)
Minimum Maximum
Width
Length
Copies 1 original + 4 copies
Total
Thickness
Weight
(one sheet of
multipart)
Quality
Jointing Line glue at the top or one side of form.
(inch)
(mm)
(inch)
(mm)
(inch)
(mm)
(g/m2)
(lb.)
Plain paper, Reclaimed paper
Not curled, not folded, not crumpled.
(3.9)
100
(3.9)
100
(0.0047)
0.12
52
(14)
NOTE: Printing on reclaimed paper is available only under normal
temperature and humidity conditions.
(10.1)
(257)
(14.3)
(364)
(0.015)
0.39
90
(24)
Product Description Paper Specifications 36
LX-300+ Revision A
Envelope
Continuous paper (Single sheet and Multipart)
Table 1-37. Envelope
Minimum Maximum
Envelop
Width
(No. 6)
Length
Width
Envelop
(No. 10)
Length
Total Thickness
Weight
Quality
(inch)
(mm)
(inch)
(mm)
(inch)
(mm)
(inch)
(mm)
(inch)
(mm)
2
(g/m
(lb.)
(0.0063)
0.16
The difference of thickness at the printable area is
within 0.25mm (0.0098 inch).
)
BOND paper, PLAIN paper or AIR MAIL
No glue at a flap
Not curled, not folded, not crumpled
45
(12)
NOTE: Printing on reclaimed paper is available only under normal
temperature and humidity conditions.
(6.5)
165
(3.6)
92
(9.5)
241
(4.1)
105
(0.0205)
0.52
90
(24)
Table 1-38. Continuous Paper (Single sheet and Multi Part)
Rear Entry Bottom Entry
Min. Max. Min. Max.
Width
Length
(one page)
Copies 1 original + 4 copies 1 original + 4 copies
Total Thickness
Weight
(not multipart)
Weight
(one sheet of
multipart)
Quality
Jointing
(inch)
(mm)
(inch)
(mm)
(inch)
(mm)
(g/m
(lb.)
(g/m2)
(lb.)
2
)
(4)
101.6
(4)
101.6
(0.0025)
0.065
52
(14)
40
(12)
Plain paper, Reclaimed
paper, Carbonless
multipart paper
Point glue or paper
staple (both sides)
(10)
254
(22)
558.8
(0.015)
0.39
82
(22)
58
(15)
(4)
101.6
(4)
101.6
(0.0025)
0.065
52
(14)
40
(12)
Plain paper, Reclaimed
paper, Carbonless
multipart paper
Point glue or paper
staple (both sides)
(10)
254
(22)
558.8
(0.015)
0.39
82
(22)
58
(15)
NOTE: Set the longer side of envelope horizontally.
Product Description Paper Specifications 37
LX-300+ Revision A
Labels
63.5 mm (2.5 inch) min.
Table 1-39. Continuous Paper with Labels
Rear Entry Bottom Entry
Min. Max. Min. Max.
Label size
Base sheet width
Base sheet length
(one page)
Base sheet
thickness
Total thickness
Label weight
Quality
(inch)
(mm)
(inch)
(mm)
(inch)
(mm)
(inch)
(mm)
(g/m2)
(lb.)
--- See the figure below.
--- ---
--- ---
--- ---
--- ---
---
---
(4)
101.6
(4)
101.6
(0.0028)
0.07
(0.0063)
0.16
AVERY CONTINUOUS
FORM LABELS, AVERY
MINI-LINE LABELS or the
same quality labels
NOTE: Printing on labels is available only under normal
temperature and humidity conditions.
NOTE: The base sheet of labels must be continuous paper.
64
(17)
(10)
254
(22)
558.8
(0.0035)
0.09
(0.0075)
0.19
23.8 mm
(15/16inch)
min.
Label
R_2.5 mm (0.1 inch) min.
Figure 1-8. Printable Area - Label
Roll paper
Table 1-40. Roll Paper
Minimum Maximum
Width
Length
Thickness
Weight
Quality Plain paper, Not curled, not folded, not crumpled
(inch)
(mm)
(inch)
(mm)
(inch)
(mm)
(g/m2)
(lb.)
(0.0028)
0.07
52
(14)
(8.5)
216
- - -
(0.0035)
0.09
82
(22)
NOTE: Continuous paper with labels should be inserted from the
bottom entrance.
Product Description Paper Specifications 38
LX-300+ Revision A
Physical Specifications (CSF)
1.8 Physical Specifications
Physical Specifications (Without pull tractor)
Dimensions: 366 x 275 x 159 mm (WxDxH)
Mass: Approx. 4.4 kg
Appearance: See the figure below.
Dimensions: 366 x 441 x 370 mm (WxDxH)
Mass: Approx. 4.6 kg
Appearance: See the figure below.
Figure 1-10. Appearance With CSF
Figure 1-9. Appearance Without Pull Tractor
Product Description Physical Specifications 39
LX-300+ Revision A
1.9 Accessories
Table 1-41. Enclosed Parts
Enclosed Items Quantity
User's manual 1
Driver disk 1
Ribbon cartridge (Black) 1
Power supply cable (230 V Version) 1
Table 1-42. Expendables
Enclosed Items Description
Ribbon cartridge (Black) #8750
Ribbon pack (Black) #8758
Ribbon cartridge (Color) S015073
Table 1-43. Options
Unit Description
Cut sheet feeder C80637*
Pull tractor unit C80030*
Roll paper holder #8310
Color upgrade kit C83208*
Product Description Accessories 40
OPERATING PRINCIPLES
CHAPTER
2
EPSON LX-300+ Revision A
2.1 Overview
LX-300+ consists of the printer mechanism and electric circuit boards.
Printer
Power Supply
Board
C294PSB/PSE
Main Board
C294MAIN
Figure 2-1. Component Unit
Printer mechanism: M-3M10
Circuit board
Mechanism
M-M310
Panel Board
C294PNL
Main (control circuit): C294MAIN Board
Power: C294PSB / C294PSE Board
Panel: C294PNL Board
The following sections describe the operating principles of each unit.
Operating Principles Overview 42
EPSON LX-300+ Revision A
2.2 Printer Mechanism (M-3M10)
Platen gap adjustment mechanism
Adjust lever, Platen gap detector
The following is main components of the LX-300+ printer mechanism.
Printhead
Carriage mechanism
Carriage (CR) motor, Carriage home position (HP) detector
Ribbon mechanism
Color ribbon drive mechanism (option)
Rear paper end detector
Bottom paper end detector
Platen
Paper feed mechanism
PF motor, rear paper end (RPE)detector, bottom paper end (BPE)
detector
Release mechanism
Release detector (REL)
Tractor
Release detector
Release mechanism
PF motor
Carriage guide shaft
Timing belt
Adjust lever
Platen gap detector
Ribbon Mechanism
Carriage
Carriage home position detector
Ribbon
Printhead
Carriage motor
Figure 2-2. Printer Mechanism Block Diagram
Operating Principles Printer Mechanism (M-3M10) 43
EPSON LX-300+ Revision A
2.2.1 Printhead
The table below shows the printhead specifications.
Table 2-1. Printhead Specifications
Item Specification
Number of wires 9
Diameter of wire
Wire configuration
Direct current coil resistance 33.3 ±3.3 Ω (25°C)
Head drive method Rated voltage drive
Head drive voltage 35+2.1/-3.5 V
Peak current
Head drive frequency
Head life
Environmental condition
φ
0.29 mm
See the figure below.
Note: The figure is seen from the back of the
head facing printing side.
• Normal: 0.75 A (Standard)
• Copy: 0.85 A (Standard)
1.0 A (Maximum)
• Normal: 1350Hz or less
• Copy: 1350Hz or less
• Black ribbon: 0.2 billion stroke/ wire or
more
• Color ribbon: 0.1 billion stroke/ wire or
more
• Temperature: 5 to 55°C
• Humidity: 10 to 85%
Figure 2-3. Wire Configuration
2.2.1.1 Buzzer Function
This printhead also works as a buzzer. The table below is buzzer specification.
Table 2-2. Buzzer Function -- Specification
Item Specification
Head voltage 35 +2.1 / -3.5 V
Drive frequency 2kHz, 1.5kHz
Operating Principles Printer Mechanism (M-3M10) 44
EPSON LX-300+ Revision A
2.2.2 Carriage Mechanism
The following is the components of the LX-300+ carriage mechanism and its
explanation. (Refer to Figure 2-2, "Printer Mechanism Block Diagram")
Carriage: Mounts the printhead.
CR motor: Drives carriage to the printing column direction.
Timing belt: Transfers the drive from the CR motor to the carriage.
Carriage guide shaft: Shifts the carriage parallel to the platen.
HP detector: Detects carriage home position.
CR MOTOR
This printer uses stepping motor for CR motor. Open loop control switches
the phases according to the setting period and this mechanism enables the
carriage to move until the appointed position. The table below is the CR
motor specifications.
Table 2-3. CR Motor Specifications
Item Specification
Motor type 2-phase/200-pole hybrid stepping motor
Coil resistance 5.7Ω±10% (25°C)
Control method Bi-polar drive
Phase drive 2-2 phase, 1-2 phase, W1-2 phase
Drive voltage 36.75 ±1.75 V
CR feed pitch
Minimum Resolution:
0.212 mm (1/120”) (1-2 phase, 2 pass)
Operating Principles Printer Mechanism (M-3M10) 45
EPSON LX-300+ Revision A
The following table shows the various carriage speed modes.
Table 2-4. Carriage Speed Mode
Carriage
speed
mode
A 3600
B 3375
C 2700
D 2250
E 1800
F 1350 Both 1-2 0.65 0.65 0.59 0.59 0.59 120 1350
G 1125 Both 1-2 0.65 0.65 0.59 0.59 0.59 144 1350 Bit image 144 dpi I x
H 900 Both 1-2 0.65 0.65 0.59 0.59 0.59 180 1350 NLQ 15cpi I x
I 675 Both 1-2 0.65 0.65 0.59 0.59 0.59 240 1350 NLQ 17/20cpi J x
J 450 Both 1-2 0.650.650.590.590.59 - x
CR drive
frequency
[Hz]
Printing
mode
Color 2-2 0.79 0.79 0.70 0.70 0.70
BW 2-2 0.70 0.59 0.59 0.59 0.59
Color 2-2 0.79 0.79 0.70 0.70 0.70
BW 2-2 0.70 0.59 0.59 0.59 0.59
Color 2-2 0.79 0.79 0.70 0.70 0.70
BW 2-2 0.70 0.59 0.59 0.59 0.59 Draft 12cpi
Color 2-2 0.79 0.79 0.70 0.70 0.70 1440/21 1286
BW 2-2 0.70 0.59 0.59 0.59 0.59 72 1350 Bit image 72 dpi
Color 2-2 0.79 0.79 0.70 0.70 0.70 80 1200 Bit image 80 dpi
BW 1-2 0.65 0.65 0.59 0.59 0.59 90 1350
Phase
drive
[pps]
Front
rush
Current limit (A/phase) Adjacent
High
speed
Normal
speed
Low
speed
Rear
rush
dot
resolution
[dpi]
45 1350
48 1350
60 1350
Head drive
frequency
[Hz]
Printing speed
High speed draft
10cpi
High speed draft
12cpi
High speed draft
15cpi
Draft 10cpi
Bit image 60 dpi
High speed draft
17cpi
High speed draft
20cpi
Draft 15cpi
Bit image 90 dpi
Draft 20/17cpi
NLQ 10cpi
Bit image 120 dpi
Carriage
speed mode
at power
down
C
E
F
F
Gx
Ix
High or
low
speed
printing
{
{
{
{
Operating Principles Printer Mechanism (M-3M10) 46
EPSON LX-300+ Revision A
CARRIAGE HOME POSITION (HP) DETECTOR
The table below is the HP detector specifications.
Table 2-5. HP detector Specifications
Item Specification
Method Mechanical contact method
Switching rate 0.6 to 1.0 mA, 5 VD±5%
Switching mode
• out of HP: close
• within HP: open
HP detector detects the signal right after when the CR motor switches the
phase.
2.2.2.1 High speed skip method
At no-printing area, the carriage moves at high speed compared to the
normal carriage speed at printing. This is called carriage control.
2.2.3 Ribbon Mechanism
2.2.3.1 Ink Ribbon Shifting Mechanism
Ink ribbon shifting mechanism: CR motor drives timing belt and the timing
belt driven pulley drives the ribbon shifting gears.
2.2.3.2 Color Ribbon Driving Mechanism (Option)
Color ribbon driving mechanism: shifts the color ribbon up and down to
change the color area of the ribbon to be printed.
Color ribbon mechanism consists of the color shift (CS) motor, CS cam,
ribbon detector, CS lever assembly and color cartridge holder. Color ribbon is
installed on the color cartridge holder.
When CS motor revolves, 1) the pinion revolves CS cam, 2) the CS lever
assembly on the CS cam shifts the color cartridge holder up and down and 3)
drives ribbon up and down.
Table 2-6. CS Motor Specifications
Item Specification
Motor type 2-phase/48-pole PM stepping motor
Coil resistance 150Ω ±5% (25°C, per 1 phase)
Control method uni-polar rated voltage drive
Phase drive 2-2 phase
Drive voltage 36.75 ± 1.75 VDC
Consuming current
Drive frequency 500 pps
• Operating, peak current: 245 mA
• Non-operating: 20 mA
Operating Principles Printer Mechanism (M-3M10) 47
EPSON LX-300+ Revision A
CS motor
CS lever assembly
Color ribbon drive circuit
Ribbon detector
CS cam
Color ribbon
Black
Magenta
Yellow
Color cartridge holder
CS lever assembly
Cyan
RIBBON CARTRIDGE DETECTOR
Ribbon detector detects if the color ribbon is installed or not.
Detect Timing
When the power is applied.
When recovering from the economy mode.
When the printing is started.
Table 2-7. Ribbon Detector Specifications
Item Specification
Method Mechanical contact method
Switching rate 0.6 to 1.0 mA
• Color ribbon cartridge is installed: High
Switching mode
• Black ribbon cartridge is installed or
ribbon is not installed: Low
AVOID COLOR FROM MIXING
To avoid the color area on the ribbon from mixing up each other or minimize
the color mixing up, the printing is done by the following order when printing
green, violet and orange.
CS motor, pinion
CS cam
Figure 2-4. Color Ribbon Driving Mechanism
Table 2-8. Color Printing Order
Color First color Second color
Green Yellow Cyan
Orange Yellow Magenta
Violet Magenta Cyan
Operating Principles Printer Mechanism (M-3M10) 48
EPSON LX-300+ Revision A
COLOR MECHANISM INITIALIZATION
The printer mechanism initializes when the power is applied or when
recovering from the energy saving mode.
Color mechanism initialization
Color mechanism initialization shifts color mechanism for the black
ink area to be at the home position. Color mechanism initialization
shifts the carriage at the same time to prevent the ribbon from
hanging on the printhead.
When the buffer is cleared or when the printer is under the pause
condition, the color mechanism initializes and waits for the next
printing command.
2.2.4 Platen Gap Adjustment Mechanism
This mechanism is to adjust the distance between the platen and the
printhead (platen gap) according to the paper thickness.
The following is the components of the LX-300+ platen gap adjustment
mechanism and its explanation. (Refer to Figure 2-5, "Platen Gap Adjustment
Mechanism")
Carriage: Mounts the printhead.
Carriage guide shaft: Shifts the carriage horizontally.
PLATEN GAP (PG_SW) DETECTOR
The following is PG_SW specification.
Table 2-9. PG_SW Detector Specifications
Item Specification
Method Mechanical contact method
Switching rate 0.6 to 1.0 mA, 5 VD±5%
Switching mode
Parallelism adjust
bushing
PG_SW
•PG=0: close
• PG=0-4: open
Adjust lever
Carriage guide shaft
Carriage
Parallelism adjust
bushing
Adjust lever and Parallelism adjust bushing:
Installed at the both ends of the carriage guide shaft
Platen gap detector (PG_SW)
Carriage guide shaft is eccentric toward the adjust lever rotating center. Due
to this, when rotating the adjustment lever back and forth, the printhead shifts
Platen gap
Platen
Printhead
Adjust lever
Printer mechanism
toward and against the platen to adjust the platen gap. When printing on thick
paper such as postcards and envelops, set the adjust lever over the 1st level.
Carriage
PG detector shifts the printer to the copy mode from the printing mode.
Printing speed will be lowered but it prevents wire from breaking off.
Carriage guide shaft
Figure 2-5. Platen Gap Adjustment Mechanism
Operating Principles Printer Mechanism (M-3M10) 49
EPSON LX-300+ Revision A
2.2.5 Paper Feed Mechanism
This mechanism consists of paper feed motor (PF motor), paper feed gears,
platen, rear paper end detector, bottom paper end detector and push tractor
unit. (Refer to Figure 2-2, "Printer Mechanism Block Diagram")
Paper Feed Method
Friction feed
Push tractor feed
Uses standard push tractor
Push-pull tractor feed
Uses standard push tractor + Option tractor
Pull tractor feed
Replace the standard push tractor with option tractor
Feeder
Simple CSF (option)
Tractor (standard)
Push / Pull
Pull tractor (option)
Roll paper holder
PF MOTOR
LX-300+ uses the stepping motor for PF motor. Open loop control switches
the phase according to the
LX-300+ uses stepping motor for PF motor. Open loop control switches the
phases according to the setting period and this mechanism loads and carries
paper to the appointed position and eject paper.
The table below is the PF motor specifications.
Table 2-10. PF Motor Specifications
Item Specification
Motor type 2-phase/96-pole Hybrid stepping motor
Coil resistance 16.0Ω ±10% (25°C, per 1 phase)
Control method bi-polar rated current drive
Phase drive 1-2 phase, W1-2 phase
Drive voltage
Drive current 0.1 to 0.9A
Paper feed pitch
36.75 ± 1.75 VDC
(This voltage is added to driver.)
Minimum Resolution:
0.059 mm (1/432”) (1-2 phase, 2 pass)
Paper path
Manual loading
Rear paper load, top paper load
CSF
Rear paper load, top paper load
Push tractor
Rear paper load, top paper load
Pull tractor
Rear / Bottom paper load, top paper load
Auto loading
When loading paper manually, push paper between the platen and
the driven paper load roller. Paper will be loaded automatically.
Operating Principles Printer Mechanism (M-3M10) 50
EPSON LX-300+ Revision A
RPE DETECTOR
RPE detector is installed on the paper path at the back of the printer. The table
below shows the RPE detector specifications.
Table 2-11. RPE Detector Specifications
Item Specification
Method Mechanical contact method
Switching rate 0.6 to 1.0 mA, 5 VD±5%
Switching mode
• Paper inside: open
• No paper: close
BPE DETECTOR
BPE detector is installed right under the platen. The table below shows the
BPE detector specifications.
Table 2-12. BPE Detector Specifications
Item Specification
Method Mechanical contact method
Switching rate 0.6 to 1.0 mA, 5 VD±5%
Switching mode
• Paper inside: open
• No paper: close
2.2.5.1 Page Length Measurement
Page length measurement is a process to convert the following value to the
number of printing lines.
Value = [The number of paper feed pulse from the paper top (top margin:
4.2mm) until RPE detector detects paper end] + [forms over-ride specified
paper feed pulse] - [adjustment value]
When CSF is used:
The uncertainty of the paper end detector may vary the number of
printing lines within the same paper size. To avoid this, when CSF is
used, page length measurement calculates the printable lines and if
the paper is longer than the printable lines, the number of printing
line is considered the printable lines (fixed value).
When paper is shorter than the printable lines, the printer prints the
fixed number of lines by forms over-ride function (which allows the
fixed number of lines to be printed even when RPE detector detects
paper end).
When CSF is not used:
When loading paper manually or when tractor feed is used, the
number of printing lines of paper end is determined by forms override function after BPE or RPE detector detects paper end.
Operating Principles Printer Mechanism (M-3M10) 51
EPSON LX-300+ Revision A
2.2.6 Release Mechanism
This mechanism switches the flow of PF motor driving forth between to the
friction feed and to the tractor feed.
Compression spring
Plain
washer
Printer mechanism
Figure 2-6. Release Mechanism
Tractor gear
Paper
advance
reduction
gear
PF motor
Release lever
Release
detector
The table below shows the release detector specifications.
Table 2-13. Release Detector Specifications
Item Specification
Method Mechanical contact method
Switching rate 0.6 to 1.0 mA, 5 VD±5%
Switching mode
• Friction: open
• Tractor: close
2.2.7 Other Special Functions
2.2.7.1 Energy saving mode
This function saves electric consumption when the printer is in the standby
mode. This mode turns hold current of PF motor, CR motor and CS motor
OFF.
2.2.7.2 Quiet Mode
Quiet mode lowers printing temperature. When this mode is selected,
carriage speed will be lowered to the power down mode speed. Refer to
Table 2-4, “Carriage Speed Mode,” on page 46.
Release mechanism consists of the following.
Release lever:Shifts tractor low speed gears back and forth.
Tractor gear
Paper advance reduction gear:Transfers the PF motor driving forth to
the tractor gear.
Release detector (REL):Detects the release lever position.
Operating Principles Printer Mechanism (M-3M10) 52
EPSON LX-300+ Revision A
2.3 Electric Circuit Operating Principles
2.3.1 MAIN Board (Control Board) Electric Circuit
The figure below is the MAIN board block diagram.
ControlPanel
HPsensor
RPESensor
ReleaseSensor
BPESensor
PGSensor
Figure 2-7. MAIN Board Block Diagram
Operating Principles Electric Circuit Operating Principles 53
EPSON LX-300+ Revision A
Table 2-14. Main Elements
Elements Location Function
RISC C33208 CPU, QFP 128 pin
• Outside clock 19.66 MHz/
CPU IC3
*
G/A
PROM IC7
DRAM IC8
EEPROM IC5
RESET IC IC4
CR Motor Driver IC9 LB1847 (SANYO)
PF Motor Driver IC10 LB1847 (SANYO)
Serial I/F Transceiver IC2 HIN202CBN or equivalent
Regulator IC IC11
Regulator IC IC12
Thermistor TH1 Measures temperature of the motor driver.
IC6
Inside clock 39.32 MHz
• 8KBRAM built-in
•Various DMA
• A/D converter
Approximately 21000 gates, QFP 160 pin
• Bit manipulation
• Clock control
• interface control (IEEE1284/Type-B I/F)
• Input Buffer control
• Motor control
• Head control
4M / 8Mbit, DIP 40 / 42 pin
• Stores firmware
•CG
1/2/4M bit switching method, SPJ package 40 pin
• Various buffer, work area
AT93C46, 1kbit, SOP 8pin
• Stores default value and various parameter
M62030 (SANYO), 8 pin
• CPU and G/A reset
BA033 (ROHM) or equivalent
• Generates 3.3V logic voltage
PD494 or equivalent
• 95V rated voltage circuit
• Detects over voltage (over 150V) and sends
OFF signal to the power supply boards.
2.3.2 C294PSB / C294PSE Board
LX-300+ generates power supply by 2 power supply boards: C294PSB (100V)
and C294PSE (200V). The table below shows the power supply boards input
voltage specifications.
Table 2-15. Power Supply Boards Input Voltage Specifications
Circuit Input voltage Fuse specification
C294PSB 99 - 132VAC ULTSC-2.5A-NI
C294PSE 198 - 264VAC HT 1.25A
2.3.2.1 Electric Circuit
The power supply board supplies two types of power for control circuit and
driving mechanism. The table below shows output voltage and its use.
Table 2-16. Output Voltage and its Use
Output voltage Use
35 V +5%/ -10% Drive
5 V ± 5% Logic Voltage*
NOTE: *: Core voltage of CPU and G/A is 3.3V and it is generated by
the regulator IC on the MAIN board form +5VDC.
NOTE: *: CPU and G/A will be changed to 2in1 type later.
Operating Principles Electric Circuit Operating Principles 54
TROUBLESHOOTING
CHAPTER
3
EPSON LX-300+ Revision A
Troubleshooting
Initialization
Check
Does any
trouble occur?
Identify problems
from symptoms.
Perform
maintenance.
Check performance by
self-check function.
3.1 Overview
This chapter describes how to troubleshoot problems when any problems
occurred to the printer.
Never touch printhead and any motors right after printing
W ARNING
CAUTIO N
since they are highly heated.
When disassembling the printer, be sure to disconnect the
power cable and remove the interface cable.
Be sure to use specified tools for servicing to maintain the
quality.
Make sure to apply specified oil, grease and glue.
Perform adjustment as specified.
Troubleshooting Overview 56
Figure3-1. Troubleshooting Procedure
EPSON LX-300+ Revision A
3.2 Troubleshooting
3.2.1 Initialization Check
Before troubleshooting, check the following basic items.
1. When printer can perform printing, perform self-test and check if any
troubles occur.
2. When the printer cannot perform any printing, check the setting by
“Default Setting”. (Refer to Chapter 1.)
3. Check if the outside and inside the printer is noticeably dirty or if any
parts are broken. If there is dirt, perform cleaning referring to Chapter 6
“Maintenance”.
4. Make sure each harness is connected properly.
5. Make sure no remarkable friction among printer mechanism gears. Make
sure all gears are linked properly.
6. Make sure there is no dirt nor scratch on rollers inside the printer.
7. Perform EEPROM clear as needed. Inside setting is reset to the factory
default setting. (Refer to Chapter 1.)
3.2.2 Check Performance By Self-Check Function
LX-300+ has self-check function and it supervises the printer condition
constantly. If any problem occurs, it indicates error by indicator LED and in
some cases it notifies error to the operator by beeping the buzzer. Identify
error cause, referring to the indication first. If error is not solved, perform unit
repair.
3.2.2.1 Indicator LED
The table below shows the indicator LED and the printer condition.
Table 3-1. Indicator LED
Printer Condition Pause Paper Out Front Buzzer
Pause ON - - -
Paper Out Error ON ON - Shoot beep x3
Release Lever Error ON - - Long beep x5
Paper Eject Warning ON BLINK - -
MICRO Adjust BLINK - - -
According to
Tear Off - -
Font Select - -
Fatal Error BLINK BLINK BLINK -
LED On/Off
combination
According to
LED On/Off
combination
-
-
Paper Out Error
This error will be indicated when printer fails to feed paper or paper is
run out.
Solution
Set paper properly and try paper feed again.
Troubleshooting Troubleshooting 57
EPSON LX-300+ Revision A
Release Lever Error
This error will be indicated when wrong release lever operation is
performed. For example, if you change the release lever setting when
the printer already starts feeding paper, this error will be generated.
Solution
Reset the release lever.
Fatal Error
This error will be indicated when;
-carriage error is occurred
-input voltage is abnormal
-hardware problem is occurred
Solution
If it is carriage error, check if there is no obstacles for carriage to
move.
If it is input voltage problem, check power supply voltage.
If it is hardware problem, check machine and electric circuit.
3.2.3 Identify Problems From Symptoms
This section procedure to identify the problems from the abnormal
symptoms. Basically unit repair or replacement should be performed, but if
necessary parts level replacement should be performed.
Find your symptom in the table below and check the corresponding table.
Table 3-2. Symptoms and Solutions
Symptom Problems Check Table
When power is
applied, the printer
does not operate.
When power is
applied, the printer
becomes fatal error.
Self-test print is
abnormal.
Paper feed is
abnormal.
Control panel and
switches do not
operate properly.
Printing operation is
abnormal when it is
on-line.
Control panel LED does not
operate at all.
Printer mechanism does not
operate at all.
• Control panel indicates fatal
error.
• The printer indicates error after
initialization.
• Platen gap is not correct.
• Printhead and ribbon mask is
abnormal or their life are over.
• Vertical direction printing
quality is abnormal.
• Paper feed operation is not
performed.
• Paper switching is abnormal.
• Line feed is not equal.
• Skew is generated.
• LED indication is abnormal.
• Cannot input from switches.
• Self-test is normal, but the
printing from host computer is
abnormal.
Table 3-3 on page 59
Table 3-4 on page 59
Table 3-5 on page 59
Table 3-6 on page 60
Table 3-7 on page 60
Table 3-8 on page 60
Table 3-9 on page 61
Troubleshooting Troubleshooting 58
EPSON LX-300+ Revision A
Table 3-3. Control Panel LED Does Not Light On.
Cause Check Point Y/N Solution
Blowout of a fuse
on the power
board.
Connector is not
connected to the
power board.
Power switch is
defective.
Power board is
defective.
Power board and
the main board
are not connected
properly.
Main board is
defective.
Control panel
harness is not
connected
properly.
Control panel
board or harness
is defective.
Is a fuse on the
power board blew
out?
Are connectors
connected to the
power board
properly?
Is conductivity of
the switch is OK?
Are +5VDC and
+35VDC OK when
the power is on?
Is CN8 connected
properly?
- - Replace the main board.
Is the harness of
the control panel
connected
properly?
- - Replace the control panel.
Check the electric circuit and
printer mechanism. If there is
YES
no short circuit, replace the
fuse.
NO Replace the power board.
YES Replace the power board.
NO Replace the power board.
NO Connect CN8 properly.
Connect the harness
NO
properly.
Table 3-4. Printer Mechanism Does Not Operate.
Cause Check Point Y/N Solution
Any of CN3 to
CN12 is not
connected to the
main board
properly.
Main board is
defective.
Printer mechanism
is defective.
Are all connectors
connected
properly?
- - Replace the main board.
--
NO Connect them properly.
Replace the printer
mechanism.
Table 3-5. When Power is Applied, the Printer Becomes Fatal Error.
Cause Check Point Y/N Solution
CR motor harness
is not connected
properly.
CR motor is
defective.
HP detector
harness is not
connected
properly
HP detector is
defective.
Power board is
defective.
- - -
Is CR motor
harness CN10
connected
properly?
- - Replace the CR motor.
Is HP detector
harness CN3
connected
properly?
- - Replace the HP detector.
Is power voltage
normal?
NO Connect it properly.
NO Connect it properly.
NO Replace the power board.
Replace the main board and
printer mechanism.
Troubleshooting Troubleshooting 59
EPSON LX-300+ Revision A
Table 3-6. Self Test Print is Abnormal.
Cause Check Point Y/N Solution
Any of CN3 to
CN12 is not
connected to the
main board
properly.
Printhead driver is
defective.
Bi-d is not correct.
Printhead is
defective.
Head FFC is not
connected
properly or broken.
Platen gap is not
correct.
Ribbon mask is
defective.
Ribbon
mechanism is
defective.
Printer mechanism
is defective.
Are all
connectors
connected
properly?
- - Replace the main board.
Are rows aligned
properly when bidirectional
printing is
proceeded?
Is there any dot
missing?
- YES Replace the head FFC.
Is printing too
light / weak?
Is there any dirt
on printed
documents?
Is there any dirt
on printed
documents?
Is ribbon
advanced
properly?
- -
NO Connect them properly.
NO Adjust Bi-D.
YES Replace the printhead.
YES Adjust the platen gap.
YES Adjust the platen gap.
YES Replace the ribbon mask.
Replace the ribbon mechanism
NO
parts.
Replace the printer
mechanism.
Table 3-7. Paper Feed is Abnormal.
Cause Check Point Y/N Solution
RPE detector or
BPE detector is
defective or not
connected
properly.
Paper switching
mechanism is
defective.
Printer mechanism
paper loading
mechanism is
defective.
PF motor is
defective.
PF motor driver is
defective.
Check the
sensors. Is there
any abnormality?
Switch the
release lever. Is
the paper loading
direction
switched?
Can the release
lever be
switched?
When the power
is off, can the
printer feed
paper by rotating
the platen knob
manually?
Is PF motor
normal?
- - Replace the main board.
NO Replace the sensor.
YES
Check the connection to the
main board.
Replace the printer
NO
mechanism or check the
connection.
Replace the release sensor or
NO
check the connection.
Replace the printer
NO
mechanism or paper loading
mechanism parts.
NO Replace the PF motor.
Table 3-8. Control Panel and Switches Do Not Operate.
Cause Check Point Y/N Solution
Switch is defective.
Connect the
control panel
harness.
Control panel
board is defective
or the harness is
defective.
Is conductivity of
the switch is OK?
Control panel
harness is
connected
properly?
- - Replace the control panel.
NO Replace the control panel.
NO Connect it properly.
Troubleshooting Troubleshooting 60
EPSON LX-300+ Revision A
W ARNING
Table 3-9. Printing Operation is Abnormal When it is On-Line.
(Self-Test is Normal.)
Cause Check Point Y/N Solution
Initial setting is
wrong.
Interface cable
is not
connected
properly.
Interface cable
is defective.
Main board is
defective.
Firmware is
defective.
Check the initial
setting with the
default setting. Is it
OK?
Are cables
connected
properly?
- - Replace the interface cable.
- - Replace the main board.
Is the firmware
version latest?
NO
NO Connect them properly.
NO Replace the firmware.
Reset the setting or use the
EEPROM clear to reset setting
to the default.
3.2.4 Unit and Parts Check
This section describes the checking method of the printhead, motors and
sensors to find the defective units and parts.
When repairing the unit, make sure to turn the printer off and
plug off the power cable except when this manual specifies to
keep the power on.
3.2.4.1 Printhead Check
By measuring the direct current resistance of the printhead coil, you can
check if it is all right.
Table 3-10. Printhead Coil Resistance
Item Operation Specification
1. Set the multimeter to the resistance
Printhead
measuring range.
2. Connect the one side of the probe to C.
3. Connect the other side of the probe to
corresponding head pin No.
33.3 ± 3.3
(at 25°C/phase)
Ω
Looked From Point A
Figure3-2. Head Coil Pin No.
Troubleshooting Troubleshooting 61
EPSON LX-300+ Revision A
3.2.4.2 Motor Check
By measuring the direct current resistance of the motor coil, you can check if
the motor is all right.
Table 3-11. Motor Check
Item Operation Specification
1. Set the multimeter to the resistance measuring
CR motor
PF motor
CS motor
(option)
range.
2. Connect the one side of the probe to 1 or 2 pin.
3. Connect the other side of the probe to 3 or 4 pin.
1. Set the multimeter to the resistance measuring
range.
2. Connect the one side of the probe to 1 or 2 pin.
3. Connect the other side of the probe to 3 or 4 pin.
1. Disassemble the CS unit.
2. Set the multimeter to the resistance measuring
range.
3. Connect the one side of the probe to brown
[TBD] harness.
4. Connect the other side of the probe to other 4
harness.
5.7Ω ±10%
(at 25°C/phase)
16.0Ω ±10%
(at 25°C/phase)
150Ω ± 5%
(at 25°C/phase)
3.2.4.3 Sensor Check
When the sensor is connected mechanically, you can check the sensor by its
conductivity.
Table 3-12. Sensor Check
Item Operation Specification
1. Set the multimeter to the
HP detector
RPE detector
Release detector
BPE detector
PG detector
resistance measuring range.
2. Connect the one side of the probe
to CN3 1 pin.
3. Connect the other side of the
probe to CN3 2 pin.
1. Set the multimeter to the
resistance measuring range.
2. Connect the one side of the probe
to CN4 1 pin.
3. Connect the other side of the
probe to CN4 2 pin.
1. Set the multimeter to the
resistance measuring range.
2. Connect the one side of the probe
to CN5 1 pin.
3. Connect the other side of the
probe to CN5 2 pin.
1. Set the multimeter to the
resistance measuring range.
2. Connect the one side of the probe
to CN6 1 pin.
3. Connect the other side of the
probe to CN6 2 pin.
1. Set the multimeter to the
resistance measuring range.
2. Connect the one side of the probe
to CN3 7 pin.
3. Connect the other side of the
probe to CN3 7 pin.
When switching the
sensor actuator, it
should be switched
ON/OFF.
When switching the
sensor actuator, it
should be switched
ON/OFF.
When switching the
sensor actuator, it
should be switched
ON/OFF.
When switching the
sensor actuator, it
should be switched
ON/OFF.
When switching the
sensor actuator, it
should be switched
ON/OFF.
Troubleshooting Troubleshooting 62
EPSON LX-300+ Revision A
3.2.4.4 Printhead Driver Check
Simple check of the printer driver (Q3 ~ Q11) can be done by the following
method.
Table 3-13. Printhead Driver Check
Item Operation Specification
1. Set the multimeter to the resistance
Printer driver
(Q3 ～ Q11)
measuring range.
2. Connect the one side of the probe to
the base of the transistor.
3. Connect the one side of the probe to
emitter of the transistor.
The resistance
should NOT be
“0” or infinity.
Troubleshooting Troubleshooting 63
DISASSEMBLY AND ASSEMBLY
CHAPTER
4
EPSON LX-300+ Revision A
4.1 Overview
This chapter explains the disassembly and assembly of LX-300+.
4.1.1 Precautions
Read the precautions below before disassembling and assembling the
printer.
When disassembling and adjusting the printer, remove
W ARNING
CAUTIO N
4.1.2 Tools
The table below lists the tools recommended to use for disassembly and
assembly and adjustment. Use only tools specified here.
the AC cable off the socket.
Never touch the printer right after it finishes printing, for
the printhead is highly heated.
For disassembly and assembly of the printer, use the tools
specified in this chapter.
Use the specified oil and grease.
When performing the adjustment, follow the method
described in this manual.
Table 4-1. Recommended Tools
Tools Part No.
Needle-nose pliers B740400100
Nipper B740500100
Tweezers B741000100
Soldering bit B740200100
E ring holder #2.5 B740800400
+ driver No.2 B743800200
Box driver (opposite side distance: 7mm) B741700200
Thickness gauge B776702201
NOTE: All tools are available in market.
Table 4-2.
Device Specification
Multimeter -
Oscilloscope 50MHz
NOTE: Only component level repairing service requires oscilloscope.
Disassembly and Assembly Overview 65
EPSON LX-300+ Revision A
4.1.3 Service Checks After Repair
Before returning the printer back to the user, use the check list below to
confirm the quality of the repaired printer.
Table 4-3. Check List for Repaired Printer
Category Component Item to Check Check
OK NG
OK NG
OK NG
OK NG
OK NG
OK NG
OK NG
OK NG
OK NG
OK NG
OK NG
OK NG
Printer
Mechanism
Printhead
Carriage
mechanism
Paper feed
mechanism
Paper path
Ribbon
mask
Test printing Is the test printing successful?
Online
printing
Is dot missing?
Are any wires broken?
Does carriage move smoothly?
CR movement is not noisy?
CR mechanism is not dirty?
CR mechanism is not oily?
Is the CR motor assembly at the
correct temperature?
(Not overheating?)
Is paper advancing smoothly?
PF movement is not noisy?
PF mechanism is not dirty?
PF mechanism is not oily?
Is the PF motor assembly at the
correct temperature?
(Not overheating?)
Are all the types of paper fed
smoothly?
Does the tractor feed paper
smoothly?
Is the paper path clear of
obstructions?
Is the platen free of damage?
Is the ribbon mask free of
distortion?
Is the online printing successful?OK NG
Table 4-3. Check List for Repaired Printer
Category Component Item to Check Check
Adjustment
Version Up
Transportation
Is the platen gap adjusted
Printhead
Initial
setting
ROM
version
Ink ribbon Is ribbon removed?
accessories
correctly?
Is Bi-d adjustment value correct?OK NG
Have all user changeable
settings been reset to the default
value?
Latest ROM version ________
Are all the relevant parts
included in the shipment?
OK NG
OK NG
OK NG
OK NG
OK NG
Disassembly and Assembly Overview 66
EPSON LX-300+ Revision A
4.2 Disassembly and Assembly
This section explains the disassembly and assembly of LX-300+. Unless
otherwise specified, assembly can be done in the reverse order of the
disassembly procedure.
Anything that service person should pay attention to is described under
“Check Point”. Any adjustment required after assembly is described under
“Adjustment”.
When you have to remove parts that are not described in this chapter, refer to
the exploded diagram on Appendix of this manual.
Read 4.1.1 "Precautions" before start disassembling the
CAUTIO N
printer.
Remove ink ribbon and paper before disassembling the
printer.
The figure below is the disassembly flowchart for main component.
START
4.2.2 "Upper Housing
Removal"
4.2.3 "Printer
Mechanism Removal"
4.2.5 "C294MAIN Board
Assembly Removal"
4.2.1 "Printhead
Removal"
4.2.4 "Board Assembly
and Panel Removal"
4.2.6 "P/S Board
Assembly Removal"
Flowchart 4-1. Disassembly Flowchart (Main Component)
Disassembly and Assembly Disassembly and Assembly 67
EPSON LX-300+ Revision A
4.2.1 Printhead Removal
1. Remove the cover and the printer.
2. Remove 1 screw (CPB, 3x14) securing the printhead to the carriage
assembly.
3. Lift the printhead a little bit. Unlatch 2 hooks securing the printhead FFC
to carriage unit.
4. Remove FFC from the printhead.
CAUTIO N
ADJUSTM ENT
REQUIRED
Check if the printer is powered off before removing the
printhead.
When the printhead is replaced, perform the platen gap
adjustment.
Carriage Assembly
CPB (3x14)
Printhead
FFC
Figure4-1. Printhead Removal
Disassembly and Assembly Disassembly and Assembly 68
EPSON LX-300+ Revision A
CHECK
PO IN T
Upper Housing
LED
Panel Board Assembly
4.2.2 Upper Housing Removal
1. Remove platen knob, cover assembly, printer, tractor unit and paper eject
unit. Remove the color upgrade kit if it is installed.
2. Set the release lever to the tractor feed.
3. Remove 4 screws (CBP, 3x10) securing the upper housing to the lower
housing.
4. Remove the upper housing.
Upper Housing
CPB (3x10)
When installing the upper housing, be sure to insert
LEDs on the panel board to the LED holes of the upper
housing.
CPB (3x10)
Figure4-2. Upper Housing Removal
Disassembly and Assembly Disassembly and Assembly 69
EPSON LX-300+ Revision A
ADJUSTM ENT
REQUIRED
4.2.3 Printer Mechanism Removal
1. Remove the upper housing. (See 4.2.2 "Upper Housing Removal".)
2. Remove 3 screws (CBP, 3x10) securing the upper shield plate to the lower
housing. Remove the shield cover.
Upper Shield Plate
CBB (3x14) with washer
Printer Mechanism
Figure4-3. Upper Shield Plate
CPB (3x10)
CBB (3x14) with washer
Printer Mechanism
Main Board Assembly
Figure4-4. Harness Removal
3. Remove 2 screws with washer (CBP, 3x14) securing the printer
4. Lift the printer mechanism a little bit and remove harnesses from the
Disassembly and Assembly Disassembly and Assembly 70
mechanism to the lower housing.
main board assembly.
5. Remove the printer mechanism.
Perform Bi-D adjustment after removing the printer
mechanism.
EPSON LX-300+ Revision A
ADJUSTM ENT
REQUIRED
4.2.4 Board Assembly and Panel Removal
1. Remove the upper housing. (See 4.2.2 "Upper Housing Removal".)
2. Remove the panel FFC from the connector of panel board assembly.
3. Remove 3 screws (CBP, 3x10) securing the panel board assembly to the
lower housing.
4. Remove the panel board assembly from the lower housing.
Panel Board Assembly
CPB (3x10)
Panel FFC
4.2.5 C294MAIN Board Assembly Removal
1. Remove the upper housing. (See 4.2.2 "Upper Housing Removal".)
2. Remove the printer mechanism. (See 4.2.3 "Printer Mechanism
Removal".)
3. Remove 2 hexagon nuts securing the serial interface connector to the
lower shield plate.
4. Remove the serial interface connector from the installation hole of the
lower shield plate.
5. Remove 2 CP (M3x6) securing the parallel interface to the lower shield
plate.
6. Remove the option FFC and panel FFC from CN12 and CN13 on the board.
7. Remove the harness from the P/S board assembly from CN8.
8. Remove 3 screws (CBP, 3x10) securing the main board assembly to the
lower housing.
When the main board assembly is replaced, perform
destination setting and Bi-D adjustment.
Disassembly and Assembly Disassembly and Assembly 71
Figure4-5. Board Assembly and Panel Removal
EPSON LX-300+ Revision A
CBP (3x10)
CN8
Main Board Assembly
Figure4-6. C294MAIN Board Assembly Removal
Lower Shield Plate
CPB (3x10)
CP (M3x6)
Hexagon Nut
CN13
CN12
4.2.6 P/S Board Assembly Removal
1. Remove the upper housing. (See 4.2.2 "Upper Housing Removal".)
2. Remove the printer mechanism. (See 4.2.3 "Printer Mechanism
Removal".)
3. Remove the power cable (CN1) connecting to the P/S board assembly.
4. Remove the power switch from the lower housing.
5. Remove the harness connecting P/S board assembly to the main board
assembly. (CN8 of the main board assembly)
6. Remove 4 screws (CBP, 3x10) securing P/S board assembly to the lower
housing.
7. Remove P/S board assembly.
Power Switch
CBP (3x10)
CN1
CBP (3x10)
CBP (3x10)
P/S Board Assembly
CBP (3x10)
Figure4-7. P/S Board Assembly Removal
Disassembly and Assembly Disassembly and Assembly 72
EPSON LX-300+ Revision A
ADJUSTM ENT
REQUIRED
4.2.7 Printer Mechanism Disassembly
This section explains the disassembling procedure of the printer mechanism.
The disassembling procedure is shown in the flowchart below.
START
4.2.7.1 "CR Motor
Assembly Removal"
4.2.7.3 "Carriage Unit
Removal"
4.2.7.5 "RPE Sensor
Removal"
4.2.7.6 "BPE Sensor
Removal"
4.2.7.4 "Ribbon Feed
Mechanism Removal"
4.2.7.7 "HP Sensor
Removal"
4.2.7.8 "PG Sensor
Removal"
4.2.7.1 CR Motor Assembly Removal
1. Remove the printer mechanism. (See 4.2.3 "Printer Mechanism
Removal".)
2. Remove the tension spring, 8.10 and motor bracket and release the
tension of the timing belt.
3. Remove the timing belt from the pulley of the CR motor assembly.
4. Rotate the CR motor assembly with the motor bracket clockwise to
remove it.
Timing Belt
Tension Spring, 8.10
Disassembly and Assembly Disassembly and Assembly 73
4.2.7.10 "PF Motor
Assembly Removal"
4.2.7.11 "Paper Feed
Mechanism Disassembly"
4.2.7.2 "Platen
Removal"
4.2.7.12 "Paper Guide
Removal"
4.2.7.9 "Release Lever
Position Sensor Removal"
Figure4-8. Printer Mechanism Disassembling Procedure
CR Motor Assembly
Base Frame
Figure4-9. CR Motor Assembly Removal
When the CR motor assembly is replaced, perform Bi-D
adjustment.
EPSON LX-300+ Revision A
4.2.7.2 Platen Removal
1. Remove the printer mechanism. (See 4.2.3 "Printer Mechanism
Removal".)
2. Remove the platen grounding wire from the platen.
3. Release 1 hook at the rotating hole of the combination gear 17.5, 27 and
remove the gear from the right frame.
To unhook the combination gear 17.5, 27,
hold it and pull it to the arrow direction.
Combination gear, 17.5, 27
Gear, 34
dis20a
Bushing, 11
Platen
Gear, 34
Left frame
Bushing, 11
Platen grounding wire
Combination gear, 17.5, 27
Right frame
Figure4-11. Platen Removal
Figure4-10. Hook at the Combination Gear 17.5, 27
4. Rotate right and left bushing, 11 and remove them off from the right / left
frame.
5. Remove the platen.
Disassembly and Assembly Disassembly and Assembly 74
EPSON LX-300+ Revision A
4.2.7.3 Carriage Unit Removal
1. Remove the printer mechanism. (See 4.2.3 "Printer Mechanism
Removal".)
2. Remove the printhead. (See 4.2.1 "Printhead Removal".)
3. Remove the timing belt from the carriage installation point.
Carriage Unit
Installation Point
Figure4-12. Timing Belt Removal
Timing Belt
CR guide grounding plate
Parallelism adjust bushing
Left frame
Base frame
Figure4-13. Carriage Unit Removal
PG adjust lever
CR guide shaft
Carriage unit
Parallelism adjust bushing
Oil pad
Right frame
5. Rotate the right and left parallelism adjust bushing and remove them
4. Remove the CR shaft grounding plate from the base frame on the left side
of the printer.
from respective frame.
6. Release the PG adjust lever hook, connecting to the left frame.
Disassembly and Assembly Disassembly and Assembly 75
EPSON LX-300+ Revision A
4.2.7.4 Ribbon Feed Mechanism Removal
1. Remove the printer mechanism. (See 4.2.3 "Printer Mechanism
Removal".)
2. Remove the tension spring, 8.10 from the motor bracket and release the
tension of the timing belt. (See 4.2.7.1 "CR Motor Assembly Removal".)
3. Release 3 hooks securing the RD cover to the left frame.
4. Remove the RD cover.
PG Adjust Lever -- Hook
Figure4-14. Hook at the PG Adjust Lever
7. Remove the carriage unit along with the CR guide shaft and PG adjust
lever from the printer mechanism.
ADJUSTM ENT
REQUIRED
When the carriage unit is replaced, perform Bi-D adjustment.
RD cover
Combination gear, 51, 16.2
Left frame
RD ratchet
Base frame
Planetary lever assy.
Timing belt
Timing belt
Driven pulley assy.
Gear, 13.2
Combination gear, 51, 16.2
Figure4-15. Ribbon Feed Mechanism Removal
Disassembly and Assembly Disassembly and Assembly 76
EPSON LX-300+ Revision A
4.2.7.5 RPE Sensor Removal
1. Remove the printer mechanism. (See 4.2.3 "Printer Mechanism
Removal".)
2. Remove the hook of the RPE sensor installed at the paper guide.
3. Remove RPE sensor.
4. Remove the harness from the RPE sensor (white).
RPE sensor (white)
BPE sensor (yellow)
4.2.7.7 HP Sensor Removal
1. Remove the printer mechanism. (See 4.2.3 "Printer Mechanism
Removal".)
2. Release 2 hooks of the HP sensor securing it to the base frame with
tweezers and remove the sensor.
3. Remove the harness from the sensor (black).
HP sensor (black)
Base frame
Hook
Paper guide
Figure4-17. HP Sensor Removal
Figure4-16. RPE/BPE Sensor Removal
4.2.7.6 BPE Sensor Removal
1. Remove the printer mechanism. (See 4.2.3 "Printer Mechanism
Removal".)
2. Remove the hook of the BPE sensor installed at the paper guide.
3. Remove BPE sensor.
4. Remove the harness from the BPE sensor (yellow).
Disassembly and Assembly Disassembly and Assembly 77
EPSON LX-300+ Revision A
CAUTIO N
4.2.7.8 PG Sensor Removal
1. Remove the printer mechanism. (See 4.2.3 "Printer Mechanism
Removal".)
2. Release 2 hooks of the PG sensor securing it to the left frame with
tweezers and remove the sensor.
3. Remove the harness from the sensor (white).
Hook
4.2.7.9 Release Lever Position Sensor Removal
1. Remove the printer mechanism. (See 4.2.3 "Printer Mechanism
Removal".)
2. Release 2 hooks of the release lever position sensor securing it to the
right frame with tweezers and remove the sensor.
3. Remove the harness from the sensor (blue).
Release lever position sensor (blue)
Figure4-19. Release Lever Position Sensor Removal
Left frame
When installing the release lever position sensor, be sure to
insert it between the release lever and the right frame.
PG sensor (white)
Figure4-18. PG Sensor Removal
Disassembly and Assembly Disassembly and Assembly 78
EPSON LX-300+ Revision A
CHECK
PO IN T
4.2.7.10 PF Motor Assembly Removal
1. Remove the printer mechanism. (See 4.2.3 "Printer Mechanism
Removal".)
2. Remove the platen grounding wire from the platen.
3. Remove 1 screw (CBP, 3x10) securing the PF motor assembly to the right
frame.
4. Remove 1 hook at the right frame securing the PF motor assembly to the
right frame and remove the PF motor assembly.
Platen grounding wire
CBP (3x10)
PF motor assembly
Position marking pin
4.2.7.11 Paper Feed Mechanism Disassembly
1. Remove the printer mechanism. (See 4.2.3 "Printer Mechanism
Removal".)
2. Remove the PF motor assembly. (See 4.2.7.10 "PF Motor Assembly
Removal".)
3. Remove the release lever.
Release shaft
Release lever
Figure4-21. Release Lever Removal
Hook at the right frame
Figure4-20. PF Motor Assembly Removal
When installing the release lever, be sure to align the marking
on the release lever with the marking on the release shaft.
CHECK
PO IN T
When installing the PF motor assembly to the right frame, be
careful to align the position marking pin and motor bracket
position marking hole.
4. Release the hook of the right frame securing the gear, 27.5 and remove
the gear, plain washer 5.2x0.3x10 and the compression spring, 1.18.
Disassembly and Assembly Disassembly and Assembly 79
EPSON LX-300+ Revision A
5. Remove the combination gear, 8.5, 25.2 from the right frame.
Hook at the right frame
Combination gear, 8.5, 25.2
Gear, 27.5
Combination spring, 1.18
Plain washer, 5.2 x 0.3 x 10
Figure4-22. Paper Feed Mechanism Disassembly
Disassembly and Assembly Disassembly and Assembly 80
EPSON LX-300+ Revision A
Hook at the paper guide
4.2.7.12 Paper Guide Removal
1. Remove the printer mechanism. (See 4.2.3 "Printer Mechanism
Removal".)
2. Remove the platen. (See 4.2.7.2 "Platen Removal".)
3. Remove the carriage unit. (See 4.2.7.3 "Carriage Unit Removal".)
4. Remove the HP sensor. (See 4.2.7.7 "HP Sensor Removal".)
5. Remove the PG sensor. (See 4.2.7.8 "PG Sensor Removal".)
6. Remove the PF motor assembly and release lever. (See 4.2.7.10 "PF Motor
Assembly Removal".)
7. Release 1 hook securing the paper guide to the bottom of the paper guide
to the lower paper guide, pull the paper guide to the rear and remove it.
Hook at the left frame
Paper guide
8. Release 1 hook at the left frame securing the base frame and remove it by
pulling it to the rear.
Base frame
Hook at the left frame
dis25a
Figure4-24. Left Frame Removal
9. Release 1 hook securing the paper guide to the lower paper guide and
remove the paper guide along with the release shaft by pulling it to the
left.
Disassembly and Assembly Disassembly and Assembly 81
Lower paper guide
Figure4-23. Lower Paper Guide Removal
Figure4-25. Lower Paper Guide
ADJUSTMENT
CHAPTER
5
EPSON LX-300+ Revision A
5.1 Overview
This chapter explains the adjustment required after disassembling the printer.
5.1.1 Platen Gap Adjustment
Platen gap adjustment is required at the following cases.
Printhead is replaced.
Carriage is replaced.
CR guide shaft is removed.
Parallelism adjust bushing is removed.
Printing is too thin.
Ink ribbon often gets jammed.
Follow the steps below before performing the platen gap adjustment.
1. Remove the upper housing. (Refer to Ch4.)
2. Set the PG adjust lever to “0”.
3. Remove the printhead and remove the ribbon mask.
4. Re-install the printhead.
5. Follow the procedure in the flowchart below for the adjustment.
START
Move the carriage unit to
the left end.
Is the platen gap
within the range of
the setting?
Move the carriage unit to
the right end.
Is the platen gap
within the range of
the setting?
Move the carriage unit to
the center.
Adjust the platen gap at
the left end.
Adjust the platen gap at
the right end.
Table 5-1. Adjustment Method
Platen Gap Setting Judging Method
Thickness gauge 0.44mm falls down by its own
0455 ± 0.015mm (TBD)
weight:
Thickness gauge 0.47mm does NOT fall down by its
own weight: X
{
Is the platen gap
within the range of
the setting?
Table 5-2. Parallelism Adjust Bushing
Rotational direction of the parallelism adjust bushing Platen gap
Platen side Widen
Front side Narrowed
END
Figure5-1. Platen Gap Adjustment
Adjustment Overview 83
EPSON LX-300+ Revision A
5.1.2 Bi-D Adjustment
Bi-D adjustment is required at the following cases.
Main board assembly is replaced.
Printer mechanism is replaced.
Printer mechanism is removed.
Follow the steps below for the platen gap adjustment.
1. Connect the printer and the host computer by parallel interface cable.
2. Turn on the PC and the printer.
3. Set FF paper to the printer.
4. Insert FD that contains the adjustment program and click
“GWBASIC.EXE” in the disk to execute GWBASIC. The following DOS
prompt screen appears.
5. Load and run the adjustment program “Q80A10V.bas”
6. The application select screen appears. Input “G” to select “GWBASIC”
Adjustment Overview 84
EPSON LX-300+ Revision A
7. The program will ask you the production line No. Ignore it and press
ENTER.
↑
8. Printer 9/24 pin select screen appears. Use
and ↓ key to shift “>” mark to
the left of “(1) 9 pin” and press ENTER to select 9 pin printer.
9. The destination setting menu appears. Perform settings accordingly.
The current destination settings are as follows.
Table 5-3. Destination Setting List (TBD)
Destination Setting Destination Setting
EAI, EAI (Latin) USASTD EDG(NLSP) NLSP
EURO, EDG, EUL,
EUL (SCANDINAVIA),
EFS, EIS, EIB
10. Use
↑
and ↓ key or ← and → key to shift “>” mark to the left of the
EURSTD
appropriate destination and press ENTER to select destination.
EUL (MIDDLE EAST),
EAL, ESP, EHK
DEFSTD
Adjustment Overview 85
EPSON LX-300+ Revision A
11. When you select the destination, select menu below appears. You can
select from inspection within the production line (In line) or inspection for
shipment (Out Going). Use
↑
and ↓ key to shift “>” mark to the left of “Out
Going” and press ENTER.
12. On the next screen, you can input the number of printing columns per
one movement of the carriage. As the carriage width of LX-300+ is 80, use
↑
and ↓ key to shift “>” mark to the left of “(1) 80 column” and press
ENTER.
13. “Main MENU” appears. Use
↑
and ↓ key or ← and → key to shift “>” mark
to the left of “(1) Bi-D Adjust” and press ENTER.
14. The printing mode select menu for Bi-D adjustment appears. Use
key to select the printing mode and use
setting.
←
and → key to select Bi-D
↑
and ↓
Adjustment Overview 86
EPSON LX-300+ Revision A
CAUTIO N
15. Input the printing mode and the settings you want to use and input
ENTER (Write) to confirm it. Press space key and the following printing
pattern will be printed.
16. Repeat step 14 to 15 until the value “A” shown below goes within the
range below for one line for all columns.
HHHHHHHH
Table 5-4. Bi-D Rated Setting
Printing Mode Value “A”
mode 0 (High Speed draft) TBD
mode 1 (Draft) TBD
mode 4 (NLQ) TBD
17. When you finished adjustment, finish the program by pressing “ESC”
several times.
This test program used here is originally the program for
production line. Operations that are not described in this
manual are forbidden thereafter.
The adjusted value will not be stored to the EEPROM on
the main board assembly until the printer is turned off.
Clear EEPROM by the panel operation does not clear Bi-D
setting.
HHHHHHHH
HHHHHHHH
HHHHHHHH
Figure5-2. Bi-D Adjustment Pattern
Adjustment Overview 87
MAINTENANCE
CHAPTER
6
EPSON LX-300+ Revision A
6.1 Maintenance
Appropriate maintenance is necessary to keep the printer in the best
condition and prevent from troubles.
6.1.1 Cleaning
Use neutral detergent or diluted alcohol to clean the dirt on the outside.
Vacuum dust or a small piece of papers inside the printer.
When performing the maintenance, remove the AC cable
W ARNING
CAUTIO N
6.1.2 Lubrication
The lubrication point of LX-300+ is as shown in the following table. Refer to
the table for the type and the amount of oil to be used for each point. Oil and
grease have a great affect on the performance of the product, especially on
the durability and the performance at the lower temperature. EPSON
determines what kind of and how much of oil to be applied based on the
various information and analysis.
from the AC socket.
Never touch the printhead right after printing, as it is
highly heated.
Never use thinner, tricren, or ketone solvent, as it may
deform or deteriorate the plastic parts or rubber parts.
Use the specified amount of the specified oil.
Table 6-2. Lubrication Points
Fig. Lubrication Points Lubricant Quantity
3 shafts and 2 bosses of the left frame G-26 1/2 grain of rice
6-1
Shaft of RD ratchet G-26 1 grain of rice
6-2 Teeth of Gears at the left frame G-26 1/2 grain of rice
6-3 3 places on the 3 shafts of the right frame G-26 1 grain of rice
2 places on inside of cam at slope surface of
6-4
the release lever
Shaft of the PF roller drive and the rear
6-5
driven PF roller.
6-6 Paper guide from the back side at 4 places G-26 1 grain of rice
Hole of the right tractor assy frame faces to
6-7
the tractor assy guide shaft and the left TR
frame.
6-8 Oil pad O-2 0.28-0.32cc
Touching parts of the 2 sides of the base
6-9
frame.
2 touching position with the CR motor
6-10
assembly from the inside of the base frame.
Installing shaft of the combination gear,
6-11
17.5, 27 of the right frame.
Touching position of the grounding platen
spring with platen shaft.
6-12
Spur gear 34 G-26 10mm
G-26 1 grain of rice
G-26 1/2 grain of rice
G-26 1/2 grain of rice
G-26 40mm x 2 places
G-26
G-26 1/2 grain of rice
G-26 1 grain of rice
1/2 grain of rice
x 2
Table 6-1. Lubricants
Type Name Quantity Availability Part No.
Grease G-26 40g EPSON B702600001
Oil O-2 40cc EPSON B710200001
NOTE: Lubrication must be applied during the re-assembly process.
For lubrication points, refer to the following figures.
Maintenance Maintenance 89
EPSON LX-300+ Revision A
RD ratchet shaft
Driven pulley assy.
Lubrication Points
Lubricate G-26 on the 3 shafts and 1
boss of the left frame.
G-26, 1/2 grain of rice
Lubricate G-26 on the shaft of the RD
ratchet.
G-26, 1 grain of rice
Combination Gear 5.1, 16.2
Planetary lever assy.
Spur Gear, 13.2
Spur Gear, 13.2
RD ratchet
Figure 6-1. Left Frame Assembly
Lubricate G-26 at 3 places on 3
shafts at the right frame.
Shafts at the right frame assembly:
G-26, 1 grain of rice
Figure 6-3. Shafts at the Right Frame Assembly
Lubricate G-26 at 2 places on inside
of cam at slope surface of the
release lever.
Release lever:
G-26, 1 grain of rice
Lubricate G-26 on teeth of gears.
G-26, 1/2 grain of rice
Figure 6-4. Release Lever
Figure 6-2. Teeth of Gears at the Left Frame
Maintenance Maintenance 90
EPSON LX-300+ Revision A
Lubricate G-26 to the shaft of the
Drive PF roller
drive PF roller and the rear driven
PF roller. (4 places)
Lubricate G-26 into the hole of the
right TR (tractor) frame facing to
the TR guide shaft and the left TR
PF roller assembly:
frame.
G-26, 1/2 grain of rice
Tractor assembly:
G-26, 1/2 grain of rice
Rear driven PF roller
Figure 6-5. PF Roller Assembly
Set the paper guide assembly
Release shaft
Paper guide assy.
upside down and lubricate at the
touching part of the PF roller
assembly with the release shaft.
(4 places)
Paper guide assembly:
G-26, 1 grain of rice
Figure 6-6. Paper Guide Assembly
Figure 6-7. Tractor Assembly
The picture at the left is the back
Oil Pad
of the printhead.
1. Set the oil dispenser 0.30ml.
2. Lubricate O-2 on the Oil pad.
Oil pad:
O-2, 0.28-0.32 cc
Note: Make sure that the setting of
the oil dispenser is correct.
Figure 6-8. Oil Pad
Maintenance Maintenance 91
EPSON LX-300+ Revision A
Move the carriage around the
center, then lubricate G-26 on the
touching parts of the 2 sides of
the frame.
Carriage:
G-26, 40mm x 2 places
Figure 6-9. Carriage
Lubricate G-26 on the 2 touching
position with CR motor assembly
from the inside of the base frame.
CR motor assembly:
G-26, 1/2 grain of rice x 2
Lubricate G-26 on the installing
shaft of the Combination Gear,
17.5, 27 of the right frame.
Combination gear 17.5, 27:
G-26, 1/2 grain of rice
Figure 6-11. Combination Gear 17.5, 27
Lubricate G-26 to the touching
position of the platen grounding
spring with Platen shaft and the
spur gear 34.
Platen grounding spring:
G-26, 1 grain of rice.
Spur Gear:
G-26, 10mm
Figure 6-12. Platen Grounding Spring / Spur Gear
Figure 6-10. CR Motor Assembly
Maintenance Maintenance 92
APPENDIX
CHAPTER
7
EPSON LX-300+ Revision A
7.1 Connector Summary
The figure below illustrates how the primary components are connected.
Table 7-1. C294MAIN Board Connector Summary
Connector Function Pins
CN1 Parallel I/F 36
CN2 Serial I/F 6
CN3 HP Detector 2
CN4 PE (Rear) Sensor 2
CN5 Release Detector 2
CN6 PE (bottom) Detector 2
CN7 PG Detector 2
CN8 Power Board C294PSB/PSE 9
CN9 Printhead 12
CN10 CR Motor 4
CN11 PF Motor 4
CN12 CS Motor (Option) 10
CN13 Operation Panel C294PNL 12
Table 7-2. Connector Pin Assignments - CN3
Pin I/O Signal Name Function
1 I HP Carriage home position sensor signal
2 - GND Signal ground
Figure 7-1. Cable Connections
Pin I/O Signal Name Function
1 I RPE Rear paper end sensor signal
2 - GND Signal ground
Table 7-3. Connector Pin Assignments - CN4
Appendix Connector Summary 94
EPSON LX-300+ Revision A
Table 7-4. Connector Pin Assignments - CN5
Pin I/O Signal Name Function
1 I RELEASE Release sensor signal
2 - GND Signal ground
Table 7-5. Connector Pin Assignments - CN6
Pin I/O Signal Name Function
1 I BPE Bottom paper end sensor signal
2 - GND Signal ground
Table 7-6. Connector Pin Assignments - CN7
Pin I/O Signal Name Function
1 I PG Paper gap (copy mode) sensor signal
2 - GND Signal ground
Table 7-7. Connector Pin Assignments - CN8
Pin I/O Signal Name Function
1 - VH +35VDC
2 - VH +35VDC
3 - GP Signal ground
4 - GP Signal ground
5 O PSC Power save control
Table 7-8. Connector Pin Assignments - CN9
Pin I/O Signal Name Function
1 O HD7 Head data 7
2 O HD8 Head data 8
3 O HD9 Head data 9
4 O HD3 Head data 3
5 - HDCOM Common (VP)
6 - HDCOM Common (VP)
7 - HDCOM Common (VP)
8 O HD2 Head data 2
9 O HD9 Head data 9
10 O HD4 Head data 4
11 O HD8 Head data 8
12 O HD6 Head data 6
Table 7-9. Connector Pin Assignments - CN10
Pin I/O Signal Name Function
1 O CRA Carriage motor phase A
2 O CRA Carriage motor phase A
3 O CRB Carriage motor phase B
4 O CRB Carriage motor phase B
6 O POFF Power off signal
7- +5V +5VDC
8 - +5V +5VDC
Appendix Connector Summary 95
EPSON LX-300+ Revision A
Table 7-10. Connector Pin Assignments - CN11
Pin I/O Signal Name Function
1 O PFA Paper feed motor phase A
2 O PFA Paper feed motor phase A
3 O PFB Paper feed motor phase B
4 O PFB Paper feed motor phase B
Table 7-11. Connector Pin Assignments - CN12
Pin I/O Signal Name Function
1 - VH +35VDC
2 - CS/HOLD +5VDC
3- +5V +5VDC
4 O CSA CS motor phase A
5 O CSXA CS motor phase XA
6 O CSB CS motor phase B
7 O CSXB CS motor phase XB
8 - GP Signal ground
Table 7-12. Connector Pin Assignments - CN13
Pin I/O Signal Name Function
6 O LED1 LED1
7I SW1 Switch 1
8 - GND Signal ground
9 - GND Signal ground
10 I SW2 Switch 2
11 I SW3 Switch 3
9 I CSSW Color ribbon sensor signal
10 - GND Signal ground
Table 7-12. Connector Pin Assignments - CN13
Pin I/O Signal Name Function
1- +5V +5VDC
2 O LED5 LED5
3 O LED4 LED4
4 O LED3 LED3
5 O LED2 LED2
Appendix Connector Summary 96
EPSON LX-300+ Revision A
7.2 Parts List
The following table shows parts name of this product. Refer to the exploded
diagrams for parts’ number.
Table 7-13. Parts List
Number Parts Name
100 "HOUSING ASSY.,LOWER"
101 INSULATOR;A
102 INSULATOR;B
103 "HOUSING,UPPER"
104 "SHIELDPLATE,LOWER"
105 "COVER ASSY.,PRINTER"
106 KNOB;W
109 SHEET GUIDE ASSY.
111 "SHIELDPLATE,UPPER"
115 "COVER CONNECTOR,CS;W"
116 HEXAGON NUT
117 GROUNDINGPLATE
118 "GROUNDING PLATE,PANEL"
119 EDGING;A
120 LOGO PLATE
123 "FERRITE CORE,FPC-25-20"
124 "SHEET,PROTECT"
125 CONNECTOR LOCK NUT
126 RIVET B-TITE(SCREW TYPE)
127 "C.B.P-TITE,3X10,F/ZN"
128 C.B.S. SCREW
Table 7-13. Parts List
Number Parts Name
129 "C.B.B-TITE(P(13)),3X14,F/ZN"
130 C.B.(O) SCREW 4X8 F/ZG
131 C.P.SCREW
132 C.B.S. SCREW
180 "GUIDE,STACKER"
200 "BOARD ASSY.,MAIN"
320 HARNESS
300 "BOARD ASSY.,POWER SUPPLY"
400 POWER CABLE ASSY.
450 "BOARD ASSY.,PANEL"
451 "SHEET,PANEL"
500 "PRINTER MECHANISM,M-3M10-100"
501 "FRAME,LEFT" (This name is not fixed.)
502 "FRAME,RIGHT"
503 "MOTOR ASSY.,CR"
504 "EXTENSION SPRING,8.10"
505 "LEVER ASSY.,PLANET"
506 "SHAFT,CR,GUIDE"
509 "SPURGEAR,13.2"
510 "COMBINATIONGEAR,5.1,16.2"
511 "MOTOR ASSY.,PF"
512 "COVER,RD"
513 "RATCHET,RD"
514 "DETECTOR,LEAF,B1"
515 "GROUNDING WIRE,PLATEN"
Appendix Parts List 97
EPSON LX-300+ Revision A
Table 7-13. Parts List
Number Parts Name
516 "PULLEY ASSY.,DRIVEN"
517 "HARNESS,HP"
518 C.P.B SCREW
520 PAPER GUIDE
521 "DETECTOR,PE,REAR"
522 "HARNESS,PE,REAR"
523 "DETECTOR,PE,BOTTOM"
524 "HARNESS,PE,BOTTOM"
525 "HOLDER,ROLLER,PF"
526 "ROLLER,PF,DRIVEN"
527 "ROLLER,PF,DRIVEN,REAR"
528 "COMPRESSION SPRING,13.72"
529 "SHAFT,RELEASE"
530 PAPER GUIDE ASSY.
531 RETAINING RING
Table 7-13. Parts List
Number Parts Name
542 "BUSHING,PARALLEL,ADJUST"
543 "CABLE,HEAD"
544 "HARNESS,PG"
545 "PAPER GUIDE,LOWER"
550 "SPURGEAR,17"
551 PAPERSUPPORT
552 "FRAME,TR,RIGHT"
553 "FRAME,TR,LEFT"
554 "TRACTOR,LEFT"
555 "TRACTOR,RIGHT"
556 "SHAFT,TR,GUIDE"
557 "SHAFT,TR,DRIVE"
558 RETAINING RING
559 DAMPER
560 "FRAME,BASE"
532 "BUSHING,11"
533 "U-TYPE,11.2X0.13X16S/NA"
534 PLAIN WASHER
535 PLATEN
536 CARRIAGE ASSY.
537 "GROUNDING PALTE,HEAD"
538 OIL PAD
539 "LEVER,G,ADJUST"
540 RIBBON MASK
541 TIMING BELT
561 "PAPER GUIDE,SUPPORT"
562 "GROUNDING PALTE,SHAFT,CR"
563 "SHEET,CABLE,HEAD"
564 "GEAR,34"
565 "SPUR GEAR,27.5"
566 PLAIN WASHER
567 "COMPRESSION SPRING,1.18"
568 "COMBINATION GEAR,8.5,25.2"
569 "HARNESS,RELEASE"
570 PAPER EJECT ASSY.
Appendix Parts List 98
EPSON LX-300+ Revision A
Table 7-13. Parts List
Number Parts Name
571 "COMBINATION GEAR,17.5,27"
573 "GROUNDING PLATE,CS"
574 "GROUNDING WIRE,LEFT"
575 "GROUNDING WIRE,RIGHT"
576 "GROUNDING PLATE,PF"
577 "SHEET,PROTECT,CABLE"
578 "SHEET,PROTECT,M/B"
579 "SHEET,CABLE,CR"
580 "C.B.P-TITE,3X10,F/ZN"
581 C.B.S. SCREW
590 "LEVER,RELEASE"
650 "PRINT HEAD,D3910-1"
651 "LABEL,WARNING"
Appendix Parts List 99
EPSON LX-300+ Revision A
7.3 Exploded Diagrams
109
570
451
127
127
127
103
120
129
500
115
190
127
129
127
100
106
102
105
124
127(126/forEAI)
127
450
300320
118
117
116
123
111
127
127
200
117
127
128
127
132
127
128
132
119 104
180
127
125
131
400
401
320
101
102
127
130
200
400
L-300 No.01 Rev.01 10202
Figure 7-2. Exploded Diagram 1
Appendix Exploded Diagrams 100
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