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LX-HOO
TECHNICAL MANUAL
-- .--
EPSON
EPSON is a registered trademark of SEIKO EPSON CORPORATION.
IBM is a registered trademark of International Business Machines Corporation.
NOTICE
` All rights reserved. Reproduction of any part of this manual in any form
whatsoever without SEIKO EPSON's express, written permission is forbidden.
q The contents of this manual are subject to change without notice.
q All efforts have been made to ensure the accuracy of the contents of this manual.
However, should any errors be detected, SEIKO EPSON would greatly appreciate
being informed of them.
q The above notwithstanding, SEIKO EPSON can assume no responsibility for any
errors in this manual or their consequences.
@ Copyright 1987 by SEIKO EPSON CORPORATION
Nagano, Japan
-i-
REV.-A
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 damage to equipment.
The precautionary measures itemized below should always be observed when performing repair/main-
tenance procedures.
DANGER
1. ALWAYS DISCONNECT THE PRODUCT FROM BOTH THE POWER SOURCE AND THE
HOST COMPUTER BEFORE PERFORMING ANY MAINTENANCE OR REPAIR
PROCEDURE.
2. NO WORK SHOULD BE PERFORMED ON THE UNIT BY PERSONS UNFAMILIAR WITH
BASIC SAFETY MEASURES AS DICTATED FOR ALL ELECTRONICS TECHNICIANS IN
THEIR LINE OF WORK.
3. WHEN PERFORMING TESTING AS DICTATED WITHIN THIS MANUAL, DO NOT
CONNECT THE UNIT TO A POWER SOURCE UNTIL INSTRUCTED TO DO SO. WHEN
THE POWER SUPPLY CABLE MUST BE CONNECTED, USE EXTREME CAUTION IN
WORKING ON POWER SUPPLY AND OTHER ELECTRONIC COMPONENTS.
WARNING
1. REPAIRS ON EPSON PRODUCT SHOULD BE PERFORMED ONLY BY AN EPSON-CERTl-
FIED REPAIR TECHNICIAN.
2. MAKE CERTAIN THAT THE SOURCE VOLTAGE IS THE SAME AS THE RATED
VOLTAGE, LISTED ON THE SERIAL NUMBER/RATING PLATE. IF THE EPSON
PRODUCT HAS A PRIMARY AC RATING DIFFERENT FROM THE AVAILABLE POWER
SOURCE, DO NOT CONNECT IT TO THE POWER SOURCE.
3. ALWAYS VERIFY THATTHE 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 /.LP CHIPS AND CIRCUITRY, USE STATIC
DISCHARGE EQUIPMENT, SUCH AS ANTI-STATIC WRIST STRAPS, WHEN ACCESS-
ING INTERNAL COMPONENTS.
5. REPLACE MALFUNCTIONING COMPONENTS ONLY WITH THOSE COMPONENTS
RECOMMENDED BY THE MANUFACTURER; INTRODUCTION OF SECOND-SOURCE
ICS OR OTHER NONAPPROVED COMPONENTS MAY DAMAGE THE PRODUCT AND
VOID ANY APPLICABLE EPSON WARRANTY.
- ii -
REV.-A
PREFACE
This manual describes functions, theory of electrical and mechanical opera-
tions, maintenance, and repair of the LX-800.
The instructions and procedures included in this document are intended for
the experienced repair technician, who should pay attention to the precautions
on the preceding page. The chapters are organized as follows:
Chapter 1 -- Provides a general product overview, lists specifications, and
illustrates the main components of the printer
--
Chapter 2 -- Describes the theory of printer operation
Chapter 3 -- Discusses the options
Chapter 4 -- Includes a step-by-step guide for product disassembly, assem-
bly, and adjustment
Chapter 5 -- Provides Epson-approved techniques for troubleshooting
Chapter 6 -- Describes preventive maintenance techniques and lists lubri-
cants and adhesives required to service the equipment
q The contents of this manual are subject to change without notice.
- iv -
REVISION SHEET
IREVISION I DATE ISSUED CHANGE DOCUMENT
1st issue
1-1, 5, 8, 12 through 18
2-2,11, 13,28,30,38 through
42
4-1, 13, 17, 19
5-1, 2, 6
6-1
A-2, 17, 18
-v-
REV.-A
TABLE OF CONTENTS
CHAPTER 1. GENERAL DESCRIPTION
CHAPTER 2. OPERATING PRINCIPLES
CHAPTER 3. OPTIONAL EQUIPMENT
CHAPTER 4. DISASSEMBLY, ASSEMBLY, AND ADJUSTMENT
CHAPTER 5. TROUBLESHOOTING
CHAPTER 6. MAINTENANCE
APPENDIX
- vi -
REV.-A
CHAPTER 1
GENERAL DESCRIPTION
1.1 FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
...
1.2 INTERFACE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
...
1.3 SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
..
1.4 OPERATING CONTROLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-12
.
1.4.1 Dip Switch and Jumper Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-12
1.4.2 Control Panel (and Auto Sheet Load Function) . . . . . . . . . . . . . . . . 1-14
1.4.3 Self Test and Hexadecimal Dump Functions . . . . . . . . . . . . . . . . . . . . 1-15
1.4.4 SeiecType Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .--.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-16
..
--. --
1.4.5 Buzzer and Error Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-17
1.4.6 Printer Initialization and Default Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-17
1.5 MAIN COMPONENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-18
1.5.1 Printer Mechanism Model-3A10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-18
1.5.2 ROC Filter Unit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-19
.
1.5.3 ROCX Board Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-20
.
1.5.4 LCPNL Board Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-20
.
1.5.5 Housing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-21
..
LIST OF FIGURES
Fig. 1-1. Exterior View of LX-800 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
.
Fig. 1-2. Exterior View of LX-800 with Tractor Unit. . . . . . . . . . . . . . . . . . . . . . . 1-2
Fig. 1-3. Data Transmission Timing of 8-Bit Parallel Interface.... 1-3
Fig. 1-4. 57-30360 36-Pin Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-3
Fig. 1-5. Printhead Pin Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-6
Fig. 1-6. Printable Area for Cut Sheet Paper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9
Fig. 1-7. Printable Area for Roll Paper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-9
Fig. 1-8. Printable Area for Fan Fold Paper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1o
Fig. 1-9. Control Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14
..
Fig. 1-10. SelecType Flow Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 -16
.
Fig. 1-11. Mode13Al O Printer Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-18
l-i
REV.-A
Fig. 1-12. ROC Filter Unit (120V Version) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-19
Fig. 1-13. ROC Filter Unit (220V/240V Versions) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-20
Fig. 1-14. ROCX Board Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-20
.
Fig. 1-15. LCPNL Board Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-20
.
Fig. 1-16. Housing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-21
..
LIST OF TABLES
Table 1-1. LX-800 Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-2
.
Table 1-2. Connector Pin Assignments and Signal Functions . . . . . . . . 1-4
Table 1-3. Printer Select/Deselect (DC1/DC3) Control . . . . . . . . . . . . . . . . . . . . . 1-5
Table 1-4. Printer Speed, Character Size, and Column Width . . . . . . . . 1-7
Table 1-5. Type of Paper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-8
.
Table 1-6. DIP Switch Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 -12
.
Table 1-7. International Character Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-13
Table 1-8. DIP Switches Factory Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13
Table 1-9. Jumper Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-13
.
Iii
REV.-B
1.1 FEATURES
The LX-800 is a multifunctional and high speed serial dot impact printer with a compact body and the
low price.
Features include:
q 180 cps maximum speed (draft-elite), 150 cps (draft-pica)
q Upward compatibility with the LX-86
q Built in two NLQ fonts (Roman and Saris-serif)
q Direct selection of NLQ/Draft modes, and easy selection of 4 typestyle modes with SelecType controls
q Built in IBM graphics characters
q Super/Subscript, Italics, and Elite modes can be supported in NLQ
q Automatic sheet loading function
q A 3K-byte input buffer for improved throughput from the host computer
q Pull tractor feeding
q Optional interface for the EPSON #81 XX series
Tw=models of the LX-800 are manufactured. The model for t~e U.S and Australia uses printer cover
A and the model for all countries except the U.S. and Australia uses printer cover B.
Figures 1-1 and 1-2 show the external view of the LX-800. Table 1-1 lists the options.
(Printer cover A) (Printer cover B)
Fig. 1-1. Exterior View of LX-800
1-1
REV.-A
(Printer Cover A) (Printer Cover B)
Fig. 1-2. Exterior View of LX-800 with Tractor Unit
Table 1-1. LX-800 Options
I Option No. I Description
#83 1 0 Roll Paper Holder
#81 33 APPLE II Intelligent Interface
#8 143 New Serial Interface
#8 145 RS-232C/Current Loop Type 2 InterFace
#81 48 Intelligent Serial Interface
#8 165 Intelligent IEEE-488 Interface
1-2
REV.-A
1.2 INTERFACE
The LX-800 has a 8-bit parallel interface as a standard. The specifications for the 8-bit parallel interface
are as follows:
Data Format: 8-bit parallel
Synchronization: By STROBE pulse
Hand Shaking: By both ACKNLG and BUSY, or either of them
Logic Level: ITL (LS type) compatible
Data transmission timing: See Figure 1-3.
Connector: 57-30360 (AMPHENOL) or equivalent (See Figure 1-4.)
BUSY
ACKNLG
OATA
STROBE
0.5JAS
min.
1= 0.5JAS
min.
O..sus
min.
"w
NOTE: Transmission time (rising and falling time) of every input signal must be less than 0.2Ks.
Fig. 1-3. Data Transmission Timing for 8-Bit Parallel Interface
1. 19. GNO ( Pair with 1.)
2. 20. GNO ( Pair w;tn2.)
3. Z 1. GNO ( Pair w;th3.)
4. 22. GNO ( Pair wnh4.)
5. 23. GNO ( Pair w;tn5.)
6. 24. GNO ( Pair w;th6.)
7. 25. GNO ( Pair witn7.)
e. 2 6 . GNO ( Pair w;th S . )
9. 27. GNO ( P a i r w;tn9.)
10 2S. GNO ( Pair w:th 1 0 . )
11 2 9 . GND ( Pair with 11. )
12 3 0 . GNO ( Pair witn 1 2 . )
13 31. m
14 32. m
15 3 3 . GNO
16 34. NC
17 3 5 . +5V
18 36. m
Fig.1-4. 57-30360 36-Pin Connector
1-3
REV.-A
Table 1-2 shows the connector pin assignments and signal functions of the 8-bit parallel interface.
Table 1-2. Connector Pin Assignments and Signal Functions
~in No. Signal Name Return Pin No. DIR Functional Description
1 STROBE 19 In Strobe pulse to read the input data. Pulse width
must be more than 0.51Js. Input data is latched after
falling edge of this signal.
2 DATA 1 20 In Parallel input data to the printer.
3 DATA2 21 In "HIGH" level means data " 1".
4 DATA3 22 In "LOW" level means data "O".
5 DATA4 23 In
6 DATA5 24 In
7 DATA6 25 In
8 DATA7 26 In
9 DATA8 27 In
10 ACKNLG 28 out This pulse indicates data are received and the
printer is ready to accept next data.
Pulse width is approx. 12 KS.
11 BUSY 29 out HIGH indicates printer can not accept next data.
12 PE 30 out HIGH indicates paper-out. This signal is effective
only when ERROR signal is "LOW".
13 SLCT -- out Always "HIGH" output. (Pulled up to +5V through
3.3 K ohms register.)
14 AUTOFEED-XT -- In If the signal is "LOW" when the printer is initialized,
a line feed is automatically performed by input of
"CR" code. (Auto LF)
15 -- -- -- Not used.
16 GND -- -- Ground for twisted-pair grounding.
17 Chassis GND -- -- Chassis ground level of printer
18 -- -- -- Not used.
9 to 30 GND -- -- Ground for twisted-pair grounding.
31 I NIT 16 In Pulse (width: 50MS min., active "LOW") input for
printer initialization.
32 ERROR -- out LOW indicates that some error has occurred in the
printer.
33 GND -- . Ground for twisted-pair grounding
34 -- -- -- Not used.
35 -- -- out Always "HIGH". (Pulled up to +5V through a
3.3k-ohm register.)
36 SLCT-IN -- In If the signal is "LOW" when printer is initialized, the
DC l/DC3 control is disabled.
1-4
REV.-B
NOTES 1. "Return" denotes a twisted pair return line connected to signal ground. When interfacing
the printer to the host, use twisted pairs for each signal. Shield the twisted pairs, and connect
the shield to GND in order to reduce interface.
2. All interface conditions are based on TTL levels. Both the rise and fall times of all signals
must be less than 0.2Ks.
3. Refer to the Parallel Interface Timing Chart for the timing of the signals.
4. Data transfer protocol must not ignore the ACKNLG or BUSY signal. (Data can be transferred
either after recognizing the ACKNLG signal or when the BUSY signal is LOW.)
5. The AUTO FEED XT and SLCT IN signals are valid when they are not fixed to LOW level by
the DIP switch or jumper.
6. Printing tests, including those of the interface circuits, can be performed without using
external equipment: set interface connector data lines 1-8 to the desired code (a floating
signal will be a logical 1, and a grounded signal will be a O) connect the ACKNLG signal
to the STROBE signal.
7. The PE signal is valid when the ERROR signal is LOW.
-- Table 1-3. Printer Select/Deselect (DC--1/DC3) Control
SLCT IN Signal State Printer
Dcl/Dc3 Data entry
at Initialization Select/Deselect
I DC 1 I Select I Enable
HIGH DC3 Deselect Enable (Waits for a DC1. Input data is ig-
nored until a DC 1 code is received.)
DC1 Select Enable
LOW
DC3 Select Enable
1-5
REV.-A
1.3 SPECIFICATIONS
This chapter describes the specifications of the LX-800 printer.
q General Specifications
Printing method: Serial impact dot matrix
Pin configuration: 9 wires (see Figure 1-5)
Pin diameter: 0.29 mm
Dot Pinch: 0.35 mm (1/72 inch)
#1 () i 0.29mm
#2 ()
#3 t
# 4 <>
0.35mm (1 /72")
#5
t
#6 ( )
#7
#8
#9
Fig. 1-5. Printhead Pin Configuration
Printing direction:
Text mode: Bi-directional with logic seeking
Bit-image mode: Uni-directional (left to right)
Dot matrix: 9 X 9 (Draft)
11 X 18 (NQL)
6 X 8 (Graphics)
Character sets: 96 ASCII characters
96 Italic characters
32 International characters
32 International Italic characters
32 Graphics characters
96 IBM Graphics characters
Fonts: Draft, NLQ-Roman, Saris-serif
Printing speed: See Table 1-4
Character size: See Table 1-4
Column width: See Table 1-4
480 dots/line at 60 dots/inch (Bit-image)
1-6
--.--
REV.-A
Table 1-4. Printing Speed, Character Size, and Column Width
Type Style Charecter Size (mm) Column Width Pitch (meximum
Font Normal Double Empha- Con- Printing Speed (CPS) Width (maximum Chara- Characters
Height cters/LinsCPL) /inch-CPl)
Width sized densed
Draft 0 -- -- -- 150 2.1 3.1 80 10
(Pica) o 75 4.2 3.1 40 5
-- --
-- . 0 -- 75 2.1 3.1 80 10
0 0 -- 37 4.2 3.1 40 5
-- -- -- o 128 1.05 3.1 132 17
0 -- o 64 2.1 3.1 66 8.5
Draft o -- -- -- 180 2.1 3.1 96 12
(Elite) -- o 90 4.2 3.1 48 6
-- --
-- -- -- o 150 1.05 3.1 160 20
NLQ o -- -- -- 25
Super-
sub- 0 -- -- -- 1.6
script
...--
Line spacing: 1/6" or Programmable (n/2 16")
Line feed speed: Approx. 95ms/line (Line feed)
(1 line = 1/6") Approx. 75ms/line (Form feed)
Paper feed method: Friction feed or Tractor feed
Paper path: From rear of printer
q Paper Specifications
Type of paper: See Table 1-5
1-7
REV.-B
Table 1-5. Type of Paper
Cut sheet Fan-fold paper Roll paper
Size (Width) (Width) (Width)
182 mm to 216 mm 101 mm to 254 mm 216 & 3 mm
7. 15" to 8.5" 4" to 10" 8.5" & 0.12"
(Length) (Diameter of roll)
Max. 305 mm Max. 127 mm
Max. 12" Max. 5"
Thickness 0.06 mm to 0.1 mm Max. 0.25 mm 0.07 mm to 0.09 mm
Copies 1 original +2
Weight 52g/m2 to 82g/m2 (1 sheet) 52g/m2 to 64g/m2
52g/m2 to 82g/m2
(2 sheets)
35g/m2 to 58g/m2
(3 sheets)
35g/m2 to 58g/m2
for 2 sheets
+
35g/m2 to 47g/m2
for 1 sheet
Feeding method Friction feed Tractor feed Friction feed
Precautions 1. Do not use continuous 1. Release the friction 1. Use the Roll paper
form or copy paper. mechanism using the holder.
2. Dismount the Tractor release lever. 2. Dismount the Tractor
unit. 2. Use the pressure sen- unit.
sitive paper for copy-
ing. Be sure that per-
forations have a smooth
finsh.
1-8
REV.-A
Printable area: See Figures 1-6 through 1-8
7.1 5" - 8.50/182 mm - 216 mm
0.1 2", 3 g I-
Printable area I 0.1 2", 3 mm
or more =more
I I
T 0.87", : mm
or n m
1
7 F
r
i
T ABC XYZ
T
n
t
a
1 2"", b
305 mm t
e
-- a
.--
r
e
a L ABC XYZ
J
L 1 .2'.3 (
,
or mor
lm
Fig. 1-6. Printable Area for Cut Sheet Paper
8.5", 216 mm q
0.1 2"/3 mm