Epson SQ-B50/2550 User manual

EPSON
Y502999010-A
EPSON TERMINAL PRINTER
5Q-B50/2550
TECHNICAL
MANUAL

SQ.-BSO/2SS0
TECHNICAL MANUAL
EPSON

NOTICE
• All rights reserved. Reproduction of any part of this manual in any from
whatsoever without SEIKO EPSON's express written permission is forbidden.
• The contents of this manual are subject to change without notice.
• All efforts have been made to ensure the accuracy of the contents of this manual.
However, should any errors be detected, SEIKO EPSON would greatly appreciate
being informed of them.
• The above notwithstanding SEIKO EPSON can assume no responsibility for any
errors in this manual or the consequences thereof.
© Copyright 1989 by SEIKO EPSON CORPORATION
Nagano, Japan

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PRECAUTIONS
Precautionary notations throughout the text are categorized relative to 1) personal injury, and 2) damage
to equipment:
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
aDANGER 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. DANGER OF EXPLOSION IF BATTERY IS INCORRECTRY REPLACED.
REPLACE ONLY
WITH SAME OR EQUIVALENT TYPE RECOMMENDED BY SEIKO
EPSON CO. DISCARD USED BATTERIES ACCORDING TO GOVERNMENTS, SAFETY
INSTRUCTION.
2.
ALWAYS DISCONNECT THE PRODUCT FROM BOTH THE POWER SOURCE AND THE
HOST COMPUTER BEFORE PERFORMING ANY MAINTENANCE OR REPAIR
PROCEDURE.
3. 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.
4. WHEN PERFORMING TESTING AS DICTATED
WITHIN THIS MANUAL, DO NOT
CONNECT THE
UNIT TO APOWER 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 VOLTAGE IS THE SAME AS THE RATED
VOLTAGE, LISTED
ON THE SERIAL NUMBER/RATING PLATE. IF THE EPSON PROD-
UCT HAS APRIMARY-AC RATING DIFFERENT FROM THE AVAILABLE POWER
SOURCE, DO NOT CONNECT IT TO THE POWER SOURCE.
3.
ALWAYS VERIFYTHATTHE 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 J.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

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iii

PREFACE
This manual describes functions, theory of electrical and mechanical
operations, maintenance, and repair of the 50-850/2550.
The instructions and procedures included herein are intended for the
experienced repair technician, and attention should be given to the
precautions on the preceding page. The chapters are organized as follows:
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Chapter 1
Chapter 2
Chapter 3
Chapter 4
Chapter 5
Chapter 6
Provides a general product overview, lists specifications,
and illustrates the main components of the printer.
Describes the theory of printer operation.
Discusses the options
Includes a step-by-step guide for product disassembly,
assembly, and adjustment.
Provides Epson-approved techniques for troubleshooting.
Describes preventive maintenance techniques and lists
lubricants and adhesives required to service the equipment .
•
The contents of this manual are subject to change without notice.
iv

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REVISION TABLE
REVISION DATE ISSUED CHANGE DOCUMENT
A April 28, 1989 1 st issue
v

CHAPTER 1.
CHAPTER 2.
CHAPTER 3.
CHAPTER 4.
CHAPTER 5.
CHAPTER 6.
APPENDIX
TABLE OF CONTENTS
GENERAL DESCRIPTION
OPERATING PRINCIPLES
OPTIONAL EQUIPMENTS
DISASSEMBL V, ASSEMBL V, AND ADJUSTMENT
TROUBLESHOOTING
MAINTENANCE
vi
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CHAPTER 1
GENERAL
DESCRIPTION
1.1 FEATURES 1-1
1.2 SPECIFICATIONS 1-3
1.2.1
Hardware Specifications 1-3
1.2.1.1
Printing 1-3
1.2.1.2 Paper Feed 1-4
1.2.1.3 Paper 1-5
1.2.1.4 Ink 1-10
1.2.1.5 Electrical Specifications 1-11
1.2.1.6 Reliability 1·11
1.2.1.7 Environmental Conditions 1-11
1.2.1.8 Dimensions and Weight 1-12
1.2.2 Software Specifications 1-13
1.2.2.1 Control Code Level............................................ 1-13
1.2.2.2 Input Data Buffer Size 1-13
1.2.2.3 Characters 1-13
1.2.2.4 Printing 1-14
1.3 INTERFACE SPECIFICATIONS 1-18
1.3.1 Parallel Interface Specifications 1-18
1.3.2 RS-232C Serial Interface Specifications 1-21
1.4 FUNCTIONS 1-24
1.4.1 Operating Controls 1-24
1.4.1.1 Power Switch 1-24
1.4.1.2 Control Panel 1-24
1.4.1.3 SelecType 1-28
1.4.1.4 Self Test Function 1-31
1.4.1.5 Hexadecimal Dump Function 1-32
1.4.1.6 Printhead Cleaning and Capping 1-33
1.4.1.7 Ink Charge Function 1-34
1.4.1.8 Paper Load/Eject Function 1-35
1.4.1.9 TOF Adjustment Function 1-36
1.4.1.10 Tear Off Function 1-37
1.4.1.11 Reverse Paper Feed Protection 1-38
1.4.2 Reset Function 1-39
1.4.2.1 Initialization Timing and Operation 1-39
1.4.2.2 Default Values 1-40
1-i
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1.4.3 Various Detection Functions 1-40
1.4.3.1 Ink-End Detection Function 1-40
1.4.3.2 Paper-Out Detection and
Forms Override Functions 1-41
1.4.3.3 Cover Open Detection Function 1-42
1.4.3.4 Error Detection Mechanism 1-42
1.4.1.5 Buzzer 1-43
1.5 MAIN COMPONENTS 1-44
1.5.1 Printer Mechanism 1-44
1.5.2 SEIPS/SANPSE Board Unit 1-45
1.5.3 SEIMA Board 1-46
1.5.4 SEIPNL Board 1-47
1.5.5 Housing 1-48
LIST OF FIGURES
Figure 1-1. SQ-850/SQ-2550 Exterior View 1-2
Figure 1-2. Nozzle Configuration 1-3
Figure 1-3. Head Adjust Lever 1-4
Figure 1-4. Cut Sheet Printable Area 1-5
Figure 1-5. Fan-fold Paper Printable Area 1-7
Figure 1-6. Envelope Printable Area 1-8
Figure 1-7. Label Dimensions 1-9
Figure 1-8. Normal Character Matrix 1-15
Figure 1-9. Subscript Character Matrix 1-15
Figure 1-10. Superscript Character Matrix 1-15
Figure 1-11. Interface Timing Chart 1-18
Figure 1-12. 57-30360 36-pin Connector 1-18
Figure 1-13. Handshaking for RS-232C Interface 1-21
Figure 1-14. Serial Data Transmission Timing 1-22
Figure 1-15. Serial Interface Connector 1-22
Figure 1-16. Control Panel 1-24
Figure 1-17. Head Cleaning Timing Chart 1-33
Figure 1-18. Ink Path Conditions at Delivery from the Factory 1-34
Figure 1-19. Paper Conditions Just After Printing 1-38
Figure 1-20. Printer Mechanism Model-441 0/4460 1-44
1-ii

Figure 1-21. SEIPS Board Unit 1-45
Figure 1-22. SANPSE Board Unit 1-45
Figure 1-23. SEIMA Board 1-46
Figure 1-24. SEIPNL Board 1-47
Figure 1-25. Housing 1-48
LIST OF TABLES
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Table 1-1.
Table 1-2.
Table 1-3.
Table 1-4.
Table 1-5.
Table 1-6.
Table 1-7.
Table 1-8.
Table 1-9.
Expendables and Options 1-2
Envelope Specifications 1-8
Dimensions and Weight 1-12
Fonts 1-13
Print Speed, Printable Columns, and
Character Pitch 1-14
Printing Mode, Horizontal Dot Density,
and Character Size 1-16
Bit Image Printing 1-17
8-bit Parallel IIF Connector Pin Assignment 1-19
Printer Select/Deselect Control with
the DC 1 /DC3 Code 1-20
Table 1-10. Serial Interface Handshaking 1-21
Table 1-11. RS-232C Serial l/F Connector Pin Assignment 1-23
Table 1-12. Operation Flow in the SelecType Mode 1-29
l-iii

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1.1 FEATURES
The SO is a high speed 24-nozzle ink jet printer which provides high performance, a low price, high
speed printing, and an advanced auto paper handling mechanism. The SO has the following features,
in addition to those of the conventional SO-series printers.
• With the standard printer driver ESC/P-84, this printer is compatible with the widest range of
computers of any of the SO-and LO-series models.
• Advanced auto paper handling mechanism. Paper selection and load/eject operation can be
performed using only the control panel. When the optional CSF (Cut Sheet Feeder) is mounted,
switching between cut sheets and fan-fold paper (using the standard push tractor) can be performed
without removing the CSF.
•
Low noise: 50 dB (A) or less
•
Highest printing speed in its class
Draft characters: 500 CPS
LO
characters: 165 CPS
•
An 80-column model for personal use and a 136-column model for office work are available.
•
Printer operation and selection of various settings are made easier due to the employment of a control
panel with a multifunctional LCD (Liquid Crystal Display).
•The
amount of ink remaining can be seen at a glance because the ink cartridge includes an ink-level
indicator. The ink cartridge can be easily replaced from the front of the printer.
• Printing labels or envelopes is possible. Envelopes can be printed automatically with the optional
CSF.
•
Optional ID modules are available for easy interfacing to various computers, and font modules
provide a wide range of fonts.
• Maintenance is easier than for the conventional SO-series printers.
1-1

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Figure 1-1. 5Q-850/5Q-2550 Exterior View
Table 1-1 lists the expendables and options.
Table 1-1. Expendables and Options
Code number Name and Description
Expendable 5020002 Exclusive ink cartridge
Option C806111 Double-bin cut sheet feeder for the 50-2550
C806101 Single-bin cut sheet feeder for the 50-2550
C806091 Double-bin cut sheet feeder for the 50-850
C806081 Single-bin cut sheet feeder for the 50-850
C800042
Pull tractor unit for the 50-2550
C800032 Pull tractor unit for the 50-850
#8143 New serial interface
#8148 Intelligent serial interface
#8165 Intelligent IEEE-488 interface
1-2

1.2 SPECIFICATIONS
This section describes the hardware and software specifica ions of the printer.
1.2.1 Hardware Specifications
This section describes the hardware specifications of the printer.
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1.2.1.1 Printing
Printing method:
Pin configuration:
Dot pitch:
Column spacing:
On-demand type ink-jet system
24 nozzles (12 nozzles x2 rows)
0.14 mm (1/180")
2.54 mm (10 CPI)
0.14 mm (180 DPI)
Nozzle Stagger 1Nozzle Stagger 2
o :;:l:1
~2 0
o 0#3
o0O.141mm(1/180')
o :=h O.282mm
o0
o0
o0
o0
o0
'24 { "'41mm j '23
(1/18)
Figure 1-2. Nozzle Configuration
1-3

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Gap between the printhead and platen: 1.2 +0.1 mm (from the nozzle surface to the platen)
NOTE: When printing on thick paper, such as an envelope, the platen gap can be adjusted manually
to prevent the paper from being stained with ink .
•Dashed line:
Standard (1.2 mm)
• Solid line: Wide (1.8 mm)
Figure 1·3. Head Adjust Lever
1.2.1.2 Paper Feed
Feeding
methods:
Minimum line spacing:
Line spacing:
Paper insertion:
Paper feeding speed:
Friction feed
Push tractor feed
Push-pull tractor feed (when the optional tractor is used)
1/360" (0.07 mm)
1/6" or 1/8", or any of n/60", n/180", and n/360" (programmable: "n"
is a user-defined value)
From
the rear
Cut sheets and envelopes: From the upper paper entrance
Fan-fold paper and labels: From the lower paper entrance
62 msec. (Line spacing: 1/6")
4.0 IPS (inches/sec., continuous paper feeding)
WARNING
•Do not turn the manual paper feed knob, unless a paper jam occurs. The reasons are as
follows:
Usually, reverse paper feeding is prohibited by the software to prevent the paper from
becoming stained. If the knob is operated manually, this protection is defeated.
Positions set in the SelecType mode, such as TOF or tear-off positions, will be shifted .
•
Never feed the paper in reverse when printing labels, Because the labels could adhere to
the printer.
1-4

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1.2.1.3 Paper
Cut sheets
Paper width: 50-850 : 182 to 257 mm (7.17 to 10.12")
50-2550: 182 to 364 mm (7.17 to 14.33")
Paper length:
94 to 364 mm (3.70 to 14.33")
Paper thickness:
0.065 to 0.10 mm (0.0026 to 0.004")
Paper quality:
High quality paper (see Table 1-2.)
Paper
weight: 52 g/m
2
to 82 g/m
2
(45 to 70 kg/14 to 22 Ib)
WARNING
• 5et the printer in the friction drive mode.
•Do not use paper that is wide than the specified limit.
•Do not manually feed paper in the reverse direction after printing is completed.
~
3.0mm,0.12inch
or more
__ ---------------------i
182-364mm(7.2 -14.3 inch)(136 columns)
3'0~m, 182-257mm(7.2 -10.1 inch)( 80 columns)
0.12 in.
or more Printable Area
...
8.5mm
0.35inch or more
P
r
i
n
t
a
b
I
e
25mm
0.98inch
364mm
maximm
A
r
e
a
----.-a .5m m
.......L __ --'-_ L.... ..J ~.33inch
Figure 1-4. Cut Sheet Printable Area
NOTE 1: The parenthesized values apply for the 50-2550.
NOTE 2: The form override function enables printing as close as approximately 13.5 mm from the
bottom edge of the paper. However, paper feed accuracy is not guaranteed outside of the
printable area shown above by the oblique lines.
1-5

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Fan-fold paper
Paper width:
Paper thickness:
Paper quality:
Paper weight:
SO-850 : 101 to 279 mm (4.00 to 11.00")
SO-2550: 101 to 406 mm (4.00 to 16.00")
0.065 to 0.10 mm (0.0026 to 0.004")
High quality paper (See Table 1-2.)
52 to 82 g/m
2
(45 to 70 kg/14 to 22 Ib)
1-6