Epson LQ-300 - Impact Printer User manual

EPSON
TERMINAL PRINTER
LQ-300
SERVICE MANUAL
EPSON

NOTICE
All rights reserved. Reproduction of any part of this manual in any form whatsoever without
SEIKO EPSON’s express written permission is forbidden.
The contents of this manual are subjects to change without notice.
Alleffortshavebeen made toensuretheaccuracy of thecontentsofthis manual. However, should
any errors be detected, SEIKO EPSON would greatly appreciate being informed of them.
The above notwithstanding SEIKO EPSON can assume no responsibility for any errors in this
manual or the consequence thereof.
Epson is registered trademark of Seiko Epson Corporation.
General Notice: Other product names used herein are foridentication purposes only and maybe
trademarks of their respective
carnpanies.
Copyright @ 1994 by SEIKO EPSON CORPORATION Nagano, Japan
-i-

PRECAUTIONS
Precautionary notations throughout the text are categorized relative to 1) personal injury and 2)
damage to equipment.
DANGER Signals a precaution which, if ignored, could result in serious or fatal personal injury.
Great caution should be exercised in performing procedures preceded by DANGER
Headings.
WARNING Signals a precaution which, if ignored, could result in darnage to equipment.
Theprecautionary measures itemized below should alwaysbe observed when performin
grepair/
maintenance procedures.
1.
2.
3.
1.
2.
3.
4.
5.
DANGER
ALWAYS DISCONNECT THE PRODUCT FROM BOTH THE POWER SOURCE AND
PERIPHERAL DEVICES PERFORMING ANY MAINTENANCE OR REPAIR PROCE-
DURE.
NO WORK SHOULD BE PERFORMED ON THE UNIT BY PERSONS
UNTAMILIARWITH
BASIC SAFETY MEASURES AS DICTATED FOR ALL ELECTRONICS TECHNICIANS IN
THEIR LINE OF WORK.
WHEN PERFORMING TESTING AS DICTATED WITHIN THIS MANUAL, DO NOT
CONNECT THE UNITTOA POWER SOURCE UNTIL INSTRUCTED TO DO SO. WHEN
THE POWER SUPPLY CABLE MUST BE CONNECTED, USE EXTREME CAUTION IN
WORKING ON POWER SUPPLY AND OTHER ELECTRONIC COMPONENTS.
WARNING
REPAIRS ON EPSON PRODUCT SHOULD BE PERFORMED ONLY BY AN EPSON
CERTIFIED REPAIR TECHNICIAN.
MAKE CERTAIN THAT THE SOURCE VOLTAGE IS THE SAME AS THE RATED VOLT-
AGE, LISTED ON THE SERIAL NUMBER/RATING PLATE. IF THE EPSON PRODUCT
HAS A PRIMARY AC RATING DIFFERENT FROM AVAILABLE POWER SOURCE, DO
NOT CONNECT IT TO THE POWER SOURCE.
ALWAYS VERIFY THAT THE EPSON PRODUCT HAS BEEN DISCONNECTED FROM
THE POWER SOURCE BEFORE REMOVING OR REPLACING PRINTED CIRCUIT
BOARDS AND/OR INDIVIDUAL CHIPS.
IN ORDER TO PROTECT SENSITIVE MICROPROCESSORS AND CIRCUITRY, USE
STATIC DISCHARGE EQUIPMENT, SUCH AS ANTI-STATIC WRIST STRAPS, WHEN
ACCESSING INTERNAL COMPONENTS.
REPLACE MALFUNCTIONING COMPONENTS ONLY WITH THOSE COMPONENTS
BY THE MANUFACTURE; INTRODUCTION OF SECOND-SOURCE Ics OR OTHER
NONAPPROVED COMPONENTS MAY DAMAGE THE PRODUCT AND VOID ANY
APPLICABLE EPSON WARRANTY.
- ii -

PREFACE
This manual describes functions, theory of electrical and mechanical operations, maintenance, and repair
of LQ-300.
The instructions and procedures included herein are intended for the experience repair technician, and
attention should be given to the precautions on the preceding page. The chapters are organized as
follows:
CHAPTER 1. PRODUCT DESCRIPTION
Provides a general product overview, lists specifications, and illustrates the main components of the printer.
CHAPTER 2. OPERATING PRINCIPLES
Describes the theory of printer operation.
CHAPTER 3. DISASSEMBLY AND ASSEMBLY
Includes a step-by-step guide for product disassembly and assembly.
CHAPTER 4. ADJUSTMENTS
Includes a step-by-step guide for adjustment.
CHAPTER 5. TROUBLESHOOTING
Provides Epson-approved techniques for adjustment.
CHAPTER 6. MAINTENANCE
Describes preventive maintenance techniques and lists lubricants and adhesives required to service the equipment.
APPENDIX
Describes connector pin assignments, circuit diagrams, circuit board component layout and exploded diagram.
The contents of this manual are subject to change without notice.
- iv -

REVISION SHEET
Revision Issue Date Revision Page
Rev. A
September 28, 1994 1st issue
f=”:
.-..>
.$...
.,,
.
-v-
1

TABLE OF CONTENTS
CHAPTER 1.
CHAPTER 2.
CHAPTER 3.
CHAPTER 4.
CHAPTER 5.
CHAPTER 6.
APPENDIX
PRODUCT DESCRIPTION
OPERATING PRINCIPLES
DISASSEMBLY AND ASSEMBLY
ADJUSTMENTS
TROUBLESHOOTING
MAINTENANCE
. .
- vi -

CHAPTER 1 Product Description
Table of Contents
1.1 FEATURES
1-1
1.2 SPECIFICATIONS 1-2
1.2.1 Hardware Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2.1.1
1.2.1.2
1.2.1.3
1.2.1.4
1.2.1.5
1.2.1.6
1.2.1.7
1.2.1.8
1.2.1.9
Paper Handling Specifications . . . . . . . . . . . . . . . . . . . . . . . . . .
Paper Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Printable Area... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ribbon Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Environmental Conditions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Reliability. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Safety Approvals. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Physical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.
1.2.2 FirmwareS pacifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.3 INTERFACE SPECIFICATIONS
1-2
1-3
1-4
1-5
1-7
1-7
1-7
1-7
1-8
1-8
1-8
1-11
1.3.1 Paraliellnterface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11
1.3.1.I Compatible Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11
1.3.1.2 Reverse Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I-13
1.3.2 Serial Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14
1.3.3 Interface Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15
1.3.4 Preventing the Host from Data TransferTimeout . . . . . . . . . . . . . . . . . 1-15
1.4 OPERATING INSTRUCTIONS
1-16
1.4.1 Control Panel Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.
1.4.2 Self-test Function. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.4.3 Hexadecimal Dump Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.4.4 Micro Adjustment Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.4.5 PrinterStatus Indication.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.4.6 Selected Font . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.4.7 Printer Initialization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.4.7.1 Power-on Initialization. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.4.7.2 Hardware Initialization. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.4.7.3 Software Initialization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.
1.4.8 PrinterSettings . . . . . . . . . . . . . . . . . . . . . . . .......:. . : . . . . . . . . .
1.4.8.1 Selectable PrinterSettings . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.4.8.2 Changing the Default Settings. . . . . . . . . . . . . . . . . . . . . . . . . .
1-16
1-17
1-17
1-18
1-18
1-19
1-19
1-19
1-19
1-19
1-20
1-20
1-20
1.5 MAIN COMPONENTS
1-24
1.5.1 C143 MAIN Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-24
1.5.2 C130PSB/PSE Board. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-24
1.5.3 Printer Mechanism (M-5M1O) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-25
1.5.4 Housing Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-25

List of Figures
Figure 1-1. Exterior View of the LQ-300. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Figure l-2. Pin Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Figure l-3. PrintableAreafor Cut Sheets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
Figure l-4. PrintableAreafor Envelopes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
Figure l-5. PrintableAreafor Continuous Paper . . . . . . . . . . . . . . . . . . . . . . . . 1-6
Figure l-6. Data Transmission Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11
Figure 1-7. Control Panel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-16
Figure l-8. C143 MAIN Board Component Layout . . . . . . . . . . . . . . . . . . . . . . I-24
Figure l-9. C130 PSB/PSE Board Component Layout . . . . . . . . . . . . . . . . . . 1-24
Figure 1-10. Printer Mechanism (M-5 M1O). . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-25
Figure 1-11. Housing Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-25
!!
,’:~\
.,
List of Tables
Table l-1. Optional Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Table l-2. PaperThickness LeverSettings . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3 -
Table l-3. Feeding Speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
(:;
Table 1-4. Specifications for Cut Sheet Paper (CSF). . . . . . . . . . . . . . . . . . . . . 1-4
Table 1-5. Specifications for Cut Sheet Paper (Manual Insertion) . . . . . . . . . . . 1-4
Table
Table
Table
Table
Table
Table
Table
Table
Table
Table
Table
Table
Table
Table
Table
Table
Table
-6. Specifications forEnvelopes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
-7. Specifications for Continuous Paper (Single Sheet and Multi-Part) . 1-4
-8. Specifications for Continuous Paper with a Label. . . . . . . . . . . . . . . 1-5
-9. Electrical Ranges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
-lO. CharacterTables. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8
-11. Resolution. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9
-12. Printing Speed. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10
-13. Signal and Connector Pin Assignments forthe Parallel Interface. 1-12
-14. Signal and
ConnectorPin Assignments forthe Parallel Interface. 1-13
-15. Signal and Connector Pin Assignments forthe Serial Interface . . 1-14
-16. Paper Feeding Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-17
-17. Font Selection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-19
-18. Font Lightsand Language Selection . . . . . . . . . . . . . . . . . . . . . . . 1-20
-19. Default Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-21
f“~.
-20. CharacterTables. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-21
. .
-21. Page Length . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-22
-22. SkiDOver Perforation/Auto TearOff/AGM/Auto Line Feed
EX~/ACK/ State Reply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-22
Table l-23. Graphic Ptint Direction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-22
Table l-24. Software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-22
Tablel-25.interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-22
Table l-26. Bit Rate. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-22
Table 1-27. Parity Bit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-23
Table 1-28. Data Length. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-23

LWOO Service Manual
Product Description
1.1 FEATURES
The LQ300 is a small, light-weight, 24pin serial impact dot-matrix color printer suitable for
personal use. The major features of this printer are:
●
Fast printing of lo-cpi draft characters at 200 cps
●
Compact design saves precious work space
●
Easy-to-operate panel
● Quiet printing
●
Two built-in 8-bit parallel interfaces and an EIA-232D serial interface
●
Printing of up to 66 kes on A4-size or 62 lines on letter-size paper
●
Optional color printing using a color ribbon (black, magenta, cyan, yellow)
●
Detachable tractor (push, pull, and push-pull tractor feed)
Figure 1-1 shows an exterior view of the
LQ-300, and Table 1-1 lists the optional units available for
the LQ-300.
~’”pe’”Q@’
Power
lease
r
s
Sprocket
Knob
lever
Center support
Tractor unit
Figure 1-1. Exterior View of the LQ-300
Table 1-1. Optional Units
Model Description
#77!53 Ribbon oartridge (monochrome)
#7755
Ribbon oartridge (monochrome, sub-cartridge)
#7768
Ribbon cartridge (film)
S015077
Ribbon oartridge (color)
C80637*
Single-bin cut sheet feeder
C83211• Color upgrade kit
C80030*
Pull tractor unit
* The number represented by an asterisk varies depending on the country.
Rev. A
“l-1

Product Description
LQ-300 Service Manual
1.2 SPECIFICATIONS
This section provides detailed information about the LQ-300.
1.2.1 Hardware
Printing method:
Pin arrangement:
Pin diameter:
.
Specifications
5erial impact dot matrix
12 x 2, staggered
0.20 mm (0.0079 inches)
L“?”’”
Printing direction:
o
m
.?‘o
3f , !
{ \
( )
5() !
E7()
I
( ) 6
E
9
( )
i
()
8
In
4
( )
10
m11()
-!
II
13 ()
m
a
HEAD CENTER
x15
( )
I
()16
‘o
17< )
a
.
\
19()
ij
;;:
7
21 ( )
i(
)22
22 ()
I
f 5
L’24
Figure 1-2. Pin Configuration
Bidirectional with logic seeking for text and unidirectional for
graphics. (Bidirectional printing of graphics can be selected with a
printer setdng or software command.)
r
.T,
,$
,’
{:
.., .-
p
. . . . .
1-2
Rev. A

LWOO Service Manual
Product Description
1.2.1.1 Paper Handling Specifications
Paper paths
Cut sheet path: Rear entry (manual insertion or optional
CSF)
Cannot handle multi-part paper using friction feed
Continuous paper paths:
Rear entry ( push tractor feed using the push tractor unit
or pull tractor feed using the pull tractor unit or push-pull
tractor feed using both tractor units)
Continuous paper parking: Possible, using push tractor unit
CSF:
Cannot handle envelopes or multi-part paper
Feeding pitch:
% ~~, 1A ~ch, or Programmable feeding in increments of
$%o inch, minimum
Feeding system: Friction feed or
&actor (push, pull, and push-pull) feed
❑ Friction feed
● Set the release lever to the friction position.
. Insert the left edge of the sheet at the marked position.
●
Do not.perform reverse feed in the area within 0.63 inch (16 mm) from the bottom edge of
the sheet.
Push tractorfeed
● Set the release lever to the tractor position.
● Install the tractor unit in the rear in the push &actor position.
●
On the first page (that is, the page immediately after sheet loading) the accuracy of paper
feeding is not guaranteed within the area 0.87 inch (22 mm) from the top edge of the sheet.
●
On the last page, the accuracy of paper feeding is not guaranteed after the paper comes off
the tractor pins.
● During printing oflabels, never perform reverse feeding.
● Do not eject the labels from the rear.
❑ Pull tractor feed
● Set the release lever to the tractor position.
. Install the tractor unit in the top in the pull tractor position.
● Do not perform reverse feeding.
● Do not eject them from the rear.
Push pull tractor feed
● Set the release lever to the tractor position.
● Install one tractor unit in the rear in the push tractor position and install the other tractor unit
in the top in the pull tractor position.
. Do not perform reverse feeding.
● Do not eject the paper from the rear.
Paper thickness leve~
The adjust lever must be set to proper position for the
paper thickness, as shown below.
Table 1-2. Paper Thickness Lever Settings
Lever Position Paper Thickness Corresponding Paper
o
0.065 mm -0.12 mm (0.0026 in. -0.0047 in.)
Ordinary paper
1
0.12 mm -0.19 mm (0.0047 in. -0.0075 in.)
Multi-part forms (2 sheets)
2
0.19 mm -0.26 mm (0.0075 h. -0.01 in.)
Multi-part forms (3 sheets)
3
0.26 mm -0.32 mm (0.01 in. -0.013 in.)
Multi-part forms (4 sheets)
4
0.32 mm -0.44 mm (0.013 in. -0.017 in.)
Envelopes (20 lb.)
5
0.44 mm -0.52 mm (0.017 in. -0.02 in.)
Envelopes (24 lb.)
Paper-feeding speed:
See Table 1-3.
Rev. A1-3

Product Description LQ-300 Service Manual
Table 1-3. Feeding Speed
Lever Position Feeding 1/6 inch Line Feed Continuous Feed
Friction
Max. 94 ins/line Max 3.6
incheslsec.
o, 1
Tractor
Typ. 80 ins/line (*)
Typ. 3.3 incheshec (*)
Min. 75 ins/line Min. 2.8 inchhec.
I Friction
I I
2-5
Max. 106 redline Max. 2.8 incheslsec.
Tractor
Typ. 104 ins/line (*)
Typ. 2.5 inche.shec.’
Min 94 m.s/line Min. 2.2 incheskec.
* Feed speed is varies depending on the motor driving voltage.
1.2.1.2 Paper Specifications
Table 1-4. Specifications for Cut Sheet Paper (CSF)
Width
182 mm -216 mm (7.2 in. -8.5 in.)
Length
210 mm -364 mm (8.3 in. -14.3 in.)
Thickness
10.07 mm -0.12 mm (0.0028 in. -0.0047 in.)
I
Weight 64-90
g/m2 (18 -24 lb.)
Qualitv Plain oaDer. recvcled DaDer
Table 1-5. Specifications for Cut Sheet Paper (Manual Insertion)
Width
148 mm -257 mm (5.8 in. -10.1 in.)
Length
182 mm -364 mm (7.2 in. -14.3 in.)
Thickness
0.065 mm -0.14 mm (0.0025 in. -0.0055 in.)
Weight 52.3-90
g/m2 (14 -24 lb.)
Quality
I Plain paper, recycled paper
Table 1-6. Specifications for Envelopes
Size
No. 6 Width x Length: 166 mm x 92 mm (6.5 in. x 3.6 in.)
No. 10 Width x Length: 240 mm x 104 mm (9.5 in. x 4.1 in.)
Thickness
0.16 mm - 0.52 mm (0.0063 in. - 0.0197 in.)
Weight
45- 91 g/m2 (12 -24 lb.)
Quality Bond paper (not curled, folded, or crumpled), plain paper, airmail paper
Notes: . Printing of envelopes is guaranteed only at room temperature and normal humidity (15
- 25° C (59 - 77° F) ,20- 60%
RI-I).
● Variations in envelope thickness must be less than 0.25 mm (0.0098 in.).
. When inserting envelopes, keep the longer side horizontal.
Table 1-7. Specifications for Continuous Paper (Single Sheet and Multi-Part)
Width
101.6 mm - 254 mm (4.0 in. - 10.0 in.)
Total thickness 0.065 mm - 0.32 mm (0.0025 in. - 0.012 in.)
Weights
52.3- 82 g/m2 (14 - 22 lb.) — not multi-part
40- 58.2
g/m2 (12 - 15 lb.) — multi-part
Copies 4 sheets (1 original + 3 copies)
Quality
Plain paper, recycled paper, carbonless multi-part paper
1-4 Rev.
A

LQ-300 Service Manual Product Description
Table 1-8. Specifications for Continuous Paper with a Label
Label size (W x L) 63.5 mm (min.) x 23.8 mm (min.) [ 2.5 in. (min.) x 15/16 in. (min.)]
Width of base paper
101.6 mm -254 mm (4.0 in. x 10,0 in.)
Thickness of base 0.07 mm - 0.09 mm (0.0028 in. - 0.0031 in.)
paper
Total thickness
0.16 mm -0.19 mm (0.0063 in. - 0.0075 in.)
Weight
68 g/m2 (17 lb.)
Quality Plain paper
Notes: ● Use only continuous-type labels and use them only with the tractor.
. Examples of labels
—Avery Continuous Form Labels
—Avery Mini-Line Labels
● Printing of envelopes is guaranteed only at room temperature and normal humidity (15
- 25° C (59 - ’77° F) ,20- 6(Mo RI+).
1.2.1.3 Printable Area
Cut sheets
3mm[0.12”]
minimum
D
—
3mm[0.12”]
G-
minimum
b
Printable area
—
—
—
—
—
4
5,3mm[0.2”]
minimum
4
9mm[0.35”]
minimum
Figure 1-3. Printable Area for Cut Sheets
.. :.,
Rev. A 1-5

Product Description LQ-300 Service Manual
Envelopes
3mm[0.12”] 3mm[0.12”]
minimum minimum
k, =,
A L
5.3mm[0.21”]
Printable area
minimum
Figure 1-4. Printable Area for
T
13.5mm[0.53*]
minimum
Envelopes
Continuous paper
13 mm 10.51 m], ~ :
minimum 203.2 mm [8”], maximum
4----++
0,
0,
06
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
.o----
0,
0,
0,
0,
0
.
., . - . . . . . . . - . . . . - .
0,
0,
0,
0,
Q-r--
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
04
0,
0,
0,
:0
,0
,0
,0
,0
,0
,0
,0
,0
,0
,0
,0
,0
,0
,0
,0
,0
,0
,0
,0
,0
:6
,0
,0
,0
,0
,0
,0
,0
,0
,0
,0
,0
,0
,0
,0
,0
,0
,0
,0
Figure 1-5. Printable Area for Continuous Paper
1-6
Rev. A

LQ-300 Service Manual Product Description
1.2.1.4 Ribbon Specifications
Ribbon cartridge (mono): #7753
#7755 (sub-cartridge)
Ribbon cartridge (film): #7768
Ribbon cartridge (color): S015077
Ribbon color:
Black, magenta, cyan, yellow
Black ribbon life: 2 million characters (48 dots/character)
Film ribbon life:
0.2 million characters (48 dots/character)
Color ribbon life
Black: 1 million characters (48 dots/character)
Magenta: 0.7 million characters (48 dots/character)
cyan: 0.7 million characters (48 dots/character)
Yellow:
0.5 million characters (48 dots/character)
1.2.1.5 Electrical Specifications
Table 1-9. Electrical Ranges
Description 120 V Version 230 V Version
Rated voltage
120 VAC
220-240 VAC
Input voltage range
103.5-132 VAC 198-264 VAC
Rated frequency range I
50- 60 t-fz
Input frequency range
49.5- 60.5 Hz
I 1
Rated current
I
1.1 A
I 0.6 A
Dielectric strength
1000 VAC ms for 1 minute or
1200 VAC rms for 1 second
1500 VAC rms for 1 minute
(between AC line and chassis) (between AC line and chassis)
1.2.1.6 Environmental Conditions
Temperature range:
Operation:
5to35“C (41 to 95 “F)
Operation (film ribbon): 15to35‘C (59 to 95 ‘F)
Operation (envelopes,
labels, or recycled paper): 15to25‘C (59 to 77°F)
Storage:
–20 to55‘C (-4 to 131 ‘F)
Humidity (without condensation):
Operation:
Operation (film ribbon):
Operation (envelopes,
labels, or recycled paper):
Storage:
1.2.1.7 Reliability
MTBF:
Printhead life:
5 to 80?40 RH
10 to 80Y0 RH
20 to 60Y0 RH
5 to
W’/. RH
4000 power on hours (POH)
200 million strokes/wire (with monochrome ribbon)
100 million strokes/wire (with color and film ribbon)
Rev. A 1-7

Product Description
LQ-300 Service Manual
1.2.1.8 Safety Approvals
Safety standards:
Radio frequency interference:
(RFI)
U.S. version:
UL1950 with D3, CSA22.2 #950 with D3
European version: EN 60950 ~)
IEC950 (SEMKO, DEMKO, NEMKO, SETI)
U.S. version: FCC part 15 subpart B class B
European version:
Vfg.243 (VDE0878 part 3, pati 30)
EN55022
(CISPR PUB. 22) class B
1.2.1.9 Physical Specifications
Dimensions (W x D x H):
366 x 275x 141 mm (14.4 x 10.8x 5.6 inches) without tractor
Weight without tractoc 4.3 kg (9.5 lb.)
1.2.2 Firmware
Control codes:
Input data buffer
Specifications
ESC/P2
IBM X24E emulation
EPSON remote
8KB
Download memory:
10KB
Character sets:
14 international character sets and one legal character set
Character tables:
Table 1-10. Character Tables
Character Table Standard Model NLSP* Model
ITALIC
o 0
PC437 (US, Standard Europe) o 0
PC850 (Multilingual) o0
PC860 (Portuguese)
ox
PC861 (Icelandic) ox
PC863 (Canadian-French)
ox
PC865 (Norwegian)
ox
BRASCII
Iolxl
Abicomp ox
PC852 (East Europe)
xo
PC853 (Turkish)
xo
PC855
(Cvrillic)
xo
PC857 (Turkish)
Ixlol
PC864 (Arabic)
Ixlol
PC866 (Russian)
xo
PC869 (Greek)
xo
PC437 Greek xo
ISO Latin IT (TuAish) xo
ISO 8859-7 (Greek)
xo
Code MJK
(Czecho, Slovakia) xo
MAZOWIA (Polland)
xo
Bulgaria (Bulgaria)
x
o
0
Suppotied x Not suppofled
‘ NSLP =National Language Suppori
,ffq
L-. .,
1-8 Rev. A

LC?-300 Service Manual Product Description
Scalable fonts:
Character matrix:
Print mode:
Bitmap fonts: EPSON Draft
(10 cpi/ 12 cpi/ 15 cpi)
EPSON Roman
(10 cpi/ 12 cpi/ 15 cpi/ Proportional)
EPSON Saris Serif (lOcpi/ 12cpi/ 15cpi/ Proportional)
EPSON Courier
(10 cpi/ 12 cpi/ 15 cpi)
EPSON Prestige
(10 cpi/ 12 cpi)
EPSON Script
(10 cpi/ 12 cpi)
EPSON Roman
8-32 points (units= 2 points)
EPSON
!%ns serif
8-32 points (units= 2 points)
EPSON Roman T
8-32 points (units= 2 points)
EPSON Saris Serif H 8- 32points (units =2points)
Drailt 10 cpi; 12 horizontal dots, 24 vertical dots
NLQ 10
cpi; 36 horizontal dots, 24 vertical dots
Double-width
Double-height
Condensed
Bold
Double-strike
Italics
Super/subscript
Outline
Shadow
Underline (single, double, single-broken, double-broken)
Strike-through (single, double, single-broken, double-broken)
OverScore (single, double, single-broken, double-broken)
Resolution: See Table 1-11.
Printing speed and
See Table 1-12.
printable columns:
Table 1-11. Resolution
Printing Mode Horizontal
Vertical Density Adjacent Dot
Density Printed?
Draft 120
dpi
180 dpi No
Draft condensed
240 dpi 180
dpi No
LQ
360 dpi 180
dpi No
8-pin bit image
60 dpi
60 dpi
Yes
120
dpi
60 dpi
Yes
120
dpi
60 dpi No
240 dpi
60 dpi No
80 dpi
60 dpi
Yes
90
dpi
60 dpi
Yes
24-pin bit image 60
dpi
180 dpi
Yes
120
dpi
180 dpi
Yes
90
dpi
180 dpi
Yes
180
dpi
180 dpi
Yes
360
dpi
180 dpi No
Rev. A1-9

Product Description LWOO Service Manual
Table 1-12. Printing Speed
Chg\;gter Printable Maximum Print Speed
[cps]
Printing Mode Columns
Mode 1 Mode 2 Mode 3
Draft 10
cpi 80
200
133 100
12 cpi
96
240
160 120
15 cpi 120
300 200
150
Draft condensed 17 cpi
137
171
114 86
20 cpi 160
200
133 100
10 cpi 80 67 50 33
12
cpi 96
80 60
40
15
cpi 120 100
75
50
LQ condensed 17
cpi 137 114 86 57
20 160 133 100 67
Vote:
Each maximum print speed is changeable depending on attributes of characters within
--c
V: Normal —
Mode 1
{
T >12 “C
V: Down —Mode 3
J
Th c 0.19 mm
+_
V: Normal —
Mode 2
T <12 “C V:
Down—
Mode 3
Printing Mode
~Th>01,mm{T212 .+;:;:;:
-.
T <12 “C
{“
V: Down—
Mode 3
Th: Paper thickness
T :
Printhead temperature
V :
Printhead driving voltage
F“
.}
,,,
1-1o
Rev. A

LQ-300 Service Manual Product Description
1.3 INTERFACE SPECIFICATIONS
LQ-300 has a Centronics<ompatible parallel interface and an EIA-232D serial interface, one of
which can be selected in default setting mode. Auto selection is also available.
1.3.1 Parallel Interface
The parallel interface has two modes:
. Compatible mode
● Reverse mode
1.3.1.1 Compatible Mode
Data format: 8-bit parallel
Synchronization:
By STROBE pulse synchronization
Handshaking: By BUSY and
ACKNLG signals
Signal level:
Tl_’L-compatible level (IEEE-P1284 level 1 device)
Adaptable comector: 36-pin 57-30360
(Amphenol) or equivalent
Data transmission timing: See Figure 1-6.
Note:
Transition time (rise time and fall time) of every input signal must be less than 0.2 ps.
BUSY
ACKNLG
DATA
STROBE —
~
.
Figure 1-6. Data Transmission Timing
The BUSY signal is active (HIGH) under the following conditions:
. During data reception (See Figure 1-6.)
● When the innt buffer is full
. When the INIT input signal is active
. During a printer error
. During the self-test mode
. During the default setting mode
. When the parallel interface is not selected
The ERROR signal is active (LOW) under the following conditions:
. When a paper-out error occurs
. When a release lever operation error occurs
● When a fatal error occurs
The PE signal is active (HIGH) under the following conditions:
● When a paper-out error occurs
.
Rev. A
1-11

Product Description
LQ-300 Service Manual
Table 1-13 shows the connector pin assignments and signal functions for the 8-bit parallel interface.
Table 1-13. Signal and Connector Pin Assignments for Parallel Interface
Pin No.
Signal Name
(!!%”%
‘0’
Description
STROBE The STROBE pulse is used to read the input
1
19 In
data. The pulse width must be more than 0.5 ps.
Input data is latched after the falling edge of this
signal.
DATAO-DATA7 Parallel input data to the printer.
2-9
20-27
In
A HIGH level means data 1.
A LOW level means data O.
ACKNLG
This pulse indicates data has been received and
10
28 outthe printer is ready to accept more data. The
pulse width is approximately 12
U.S.
11
BUSY
29
out HIGH indicates the printer cannot acoept more
data.
12
‘E
28
out HIGH indicates paper-out. This signal is effective
only when the ERROR
signal is LOW.
13
SLCT
28
out Always HIGH output. (Pulled up to +5 V through
3.3K Qresistor.)
14
AFXT
30 In Not used.
15,34
NC
.—
Not connected.
16
GND
——Signal ground.
17
Chassis GND
—— Chassis ground.
18
LOGIC-H
—outPulled up to +5
V through 3.9K Q resistor.
19-30 GND
.—
Signal ground.
31
INIT
30 In
Input for printer initialization. Pulse width 50 w
minimum, active LOW.
32 ERROR 29
out LOW indicates that some error has o=urred in
the printer.
33 GND
——Signal ground.
35
+5V —outPulled up to +5 V through
3.3K Q resistor.
36
SLIN 30 In Not used.
*
7%e //0 column indicates the direction of the signal as viewed from the printer.
c
.%
{,,’”.
-c.-
‘{‘
. . .
1-12
Rev. A