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.
Precautionary notations throughout the text are categorized relative to 1) personal injury and 2) damage to equipment.
DANGERSignals 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.
WARNINGSignals a precaution which, if ignored, could result in damage to equipment.
The precautionary measures itemized below should always be observed when performing repair/maintenance procedures.
DANGER
1.ALWAYS DISCONNECT THE PRODUCT FROM THE POWER SOURCE AND PERIPHERAL DEVICES PERFORMING ANY MAINTENANCE OR REPAIR
PROCEDURES.
2.NO WORK SHOULD BE PERFORMED ON THE UNIT BY PERSONS UNFAMILIAR WITH BASIC SAFETY MEASURES AS DICTATED FOR ALL ELECTRONICS
TECHNICIANS IN THEIR LINE OF WORK.
3.WHEN PERFORMING TESTING AS DICTATED WITHIN THIS MANUAL, DO NOT CONNECT THE UNIT TO A POWER SOURCE UNTIL INSTRUCTED TO DO
SO. WHEN THE POWER SUPPLY CABLE MUST BE CONNECTED, USE EXTREME CAUTION IN WORKING ON POWER SUPPLY AND OTHER ELECTRONIC
COMPONENTS.
4.WHEN DISASSEMBLING OR ASSEMBLING A PRODUCT, MAKE SURE TO WEAR GLOVES TO AVOID INJURY FROM METAL PARTS WITH SHARP EDGES.
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 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 NON-APPROVED COMPONENTS MAY DAMAGE THE PRODUCT AND VOID ANY APPLICABLE EPSON WARRANTY.
6.WHEN USING COMPRESSED AIR PRODUCTS; SUCH AS AIR DUSTER, FOR CLEANING DURING REPAIR AND MAINTENANCE, THE USE OF SUCH
PRODUCTS CONTAINING FLAMMABLE GAS IS PROHIBITED.
About This Manual
W A R N I N G
C A U T I O N
C H E C K
P O I N T
A D J U S T M E N T
R E Q U I R E D
This manual describes basic functions, theory of electrical and mechanical operations, maintenance, and repair procedures of the printer.
The instructions and procedures included herein are intended for experienced repair technicians, and attention should be given to the precautions on the preceding page.
Manual Configuration
This manual consists of six chapters and Appendix.
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
Describes the step-by-step procedures for the troubleshooting.
CHAPTER 4.DISASSEMBLY / ASSEMBLY
Describes the step-by-step procedures for disassembling and assembling
the product.
CHAPTER 5.ADJUSTMENT
Provides Epson-approved methods for adjustment.
CHAPTER 6.MAINTENANCE
Provides preventive maintenance procedures and the list of Epsonapproved lubricants and adhesives required for servicing the product.
APPENDIX Provides the following additional information for reference:
• Exploded Diagram
Symbols Used in this Manual
Various symbols are used throughout this manual either to provide additional
information on a specific topic or to warn of possible danger present during a
procedure or an action. Be aware of all symbols when they are used, and always read
NOTE, CAUTION, and WARNING messages.
Indicates an operating or maintenance procedure, practice or condition
that, if not strictly observed, could result in injury.
Indicates an operating or maintenance procedure, practice, or condition
that, if not strictly observed, could result in damage to, or destruction of,
equipment.
May indicate an operating or maintenance procedure, practice or
condition that is necessary to accomplish a task efficiently. It may also
provide additional information that is related to a specific subject, or
comment on the results achieved through a previous action.
Indicates an operating or maintenance procedure, practice or condition
that is necessary to maintain the product’s quality.
Indicates that a particular task must be carried out according to a certain
standard after disassembly and before re-assembly, otherwise the
quality of the components in question may be adversely affected.
Revision Status
RevisionDate of IssueDescription
AAugust 7, 2006First Release
BDecember 1, 2006[Chapter 4]
• “4.3.1 Upper Housing (p38)”
Note when replacing the Base Frame is added to the reassembly procedure.
[Chapter 7]
• “7.1 Exploded Diagram / Parts List (p85)” are updated.
CMay 1, 2007[All chapters]
• The model name; EPSON Stylus C90/C91/C92/D92 are added.
[Chapter 1]
• “1.2.3 Ink Cartridge (p14)” is updated.
[Chapter 2]
• “ The Capping mechanism covers the printhead with the cap to prevent the nozzle from increasing viscosity when the printer is in
stand-by state or when the printer is off. (p25)” is updated.
[Chapter 4]
• “4.5.6 Ink System removal (p51)”
Caution during inserting the Ink Tube into the connector is added.
• “4.5.8 EJ Frame Assy/EJ Roller (p54)”
Reassembly procedure of the Grounding Spring, Frame is added.
[Chapter 5]
• “5.2.1 Head angular adjustment (p75)”
Print samples made by the adjustment program for Stylus C90/C91/C92/D92 is added.
[Chapter 6]
• “6.1.3 Lubrication (p81)”
Lubrication point for Stylus C90/C91/C92/D92 is added.
[Chapter 7]
• “7.1 Exploded Diagram / Parts List (p85)”
Exploded Diagrams for Stylus C90/C91/C92/D92 are added.
• “7.3 Circuit Diagrams (p96)”
Circuit diagram of Stylus C90/C91/C92/D92; C683 Main is added.
RevisionDate of IssueDescription
DMay 16, 2008[All chapters]
The model name; Stylus T20/T20E/T23/T26/S20/T10/T11/Me 30 are added.
[Chapter 1]
• “1.1 Features (p10)” is updated.
• “1.2.1 Paper Support (p12)” is updated.
• “1.2.3 Ink Cartridge (p14)” is updated.
• “1.3.1 USB Interface (p16)” is updated.
[Chapter 2]
• 2.3 Electrical Circuit Operating Principles is deleted.
[Chapter 4]
• “4.1.6 Procedural Differences between the Models (p35)” is updated.
• “4.2 Disassembly Procedures (p37)” is updated.
• “4.5.5 CR Unit/Timing Belt (p48)”
Reassembly procedure of the Installing Head FFC is added.
[Chapter 7]
• Exploded Diagram / Parts List is changed to reference to SPI.
• Circuit Diagrams is deleted.
EMay 7, 2009[All chapters]
The model name; Epson Stylus T21/T24/T27/S21 are added.
[Chapter 1]
• “1.1 Features (p10)” is updated.
• “ Print speed & printable width (p11)” is updated.
• “1.2.1 Paper Support (p12)” is updated.
• “1.2.2 Printable Area Size and Margins (p13)” is updated.
• “1.2.3 Ink Cartridge (p14)” is updated.
• “1.2.4 Black Ink Save Mode (p15)” is updated.
• “1.3.1 USB Interface (p16)” is updated.
• “1.4.1 Electrical Specifications (p17)” is updated.
• “1.4.2 Acoustic Noise (p17)” is updated.
• “1.4.3 Safety Approvals (p17)” is updated.
• “1.4.5 Environmental Performance (p18)” is revised.
• “1.4.6 Durability (p18)” is revised.
[Chapter 2]
• “2.3 Power-On Sequence (p26)” is added.
Epson Stylus C58/C59/ME 2/C79/D78/C90/C91/C92/D92/T20/T20E/T23/T26/S20/T10/T11/ME 30/T21/T24/T27/S21 Revision E
Character code:ASCII 20H to 7FH
Font:Bit map LQ font
EPSON Courier
• High quality mode, 10.16-mm (0.4") feed
TBD mm/sec (TBD inch/sec)
• High speed mode, continuous feed
TBD mm/sec (TBD inch/sec)
PRINT SPEED & PRINTABLE WIDTH
Table 1-3. Character Mode
Character PitchPrintable ColumnsCR Speed
10 CPI (Pica)80419 mm/s (165 CPS*)
Note * : CPS: Characters per second
Table 1-4. Graphics Mode
Horizontal
Resolution
360 dpi
720 dpi
1440 dpi
5760 dpi
Printable
Area
209.8 mm
(8.26")
209.8 mm
(8.26")
209.8 mm
(8.26")
209.8 mm
(8.26")
Max. Dot
Count
2976
5952
11904
23808VSD3VSD3
Epson Stylus C58/
C59/ME 2
EcoEco
VSD1VSD1
---VSD2’ (Color)
VSD2VSD2
---VSD2’ (Black)
VSD3---
---VSD3’ (Color)
VSD3VSD3
---VSD3’ (Black)
Dot Size
Epson Stylus C79/
D78/C90/C91/C92/
D92/T20/T20E/
T23/T26/S20/T10/
T11/ME 30/T21/
T24/T27/S21
CR
Speed
723.9 mm/s
(360 CP)S
419.1 mm/x
(165 CPS)
609.6 mm/s
(240 CPS)
PRODUCT DESCRIPTION Printer Specifications11
Epson Stylus C58/C59/ME 2/C79/D78/C90/C91/C92/D92/T20/T20E/T23/T26/S20/T10/T11/ME 30/T21/T24/T27/S21 Revision E
C A U T I O N
1.2.1 Paper Support
Following table shows the paper type and sizes supported by the printer.
Supported paper type and sizes vary depending on the markets.
Table 1-5. Paper Support
*5
*3
*1
*1
*1*4
*3
*1
*3
*2*6
Thickness
(mm)
0.08-0.11
N/A
0.11
0.1190 g/m
0.13
*3
0.27
*1
0.27
0.23
ItemPaper Size
Plain paper
Recycled paper
Envelope
(Bond paper, Air mail, PPC)
Premium Ink Jet Plain Paper
Premium Bright White Paper
Bright White Ink Jet Paper
Premium Photo Paper Glossy (EAI)
Premium Glossy Photo Paper (Other)
EPSON special paper
Premium Photo Paper Semi-Gloss (EAI)
Premium Semigloss Photo Paper (Other)
Premium Presentation Paper Matte (EAI)
Matte Paper-Heavyweight (Other)
Letter
Legal
Half Letter
A4
A5
A6
B5
User defined
No.10
DL
C6
A4
*7
A4
Letter
A4
Letter
*1
A4
8" x 10"
5" x 7"
4" x 6"
16:9 wide
L (3R)
Letter
*1
4" x 6"
Letter
*1
8" x 10"
Weight
64-90 g/m
2
(17-24 lb.)
45-75g/m
2
(12-20 lb.)
80 g/m2 (21 lb.)
2
(24 lb.)
92.5 g/m2 (25 lb.)
255 g/m2 (68 lb.)
250 g/m2 (66 lb.)A4
167 g/m2 (45 lb.)A4
Table 1-5. Paper Support
*3
*
*1
*3
*3
*1
*1
*1*4
*6
*6
1
Thickness
(mm)
0.12
0.25
0.30
0.24190
Weight
102 g/m2 (27 lb.)
258 g/m2 (68 lb.)
290 g/m2 (77 lb.)
g/m2 (51 lb.)
ItemPaper Size
Presentation Paper Matte (EAI)
Photo Quality Inkjet Paper (Other)
A4
*2
Letter
*1
Photo Paper Glossy (EAI)
Glossy Photo Paper (EUR, Asia)
A4
5" x 7"
4" x 6"
Letter
*3
A4
Ultra Premium Photo Paper Glossy (EAI)
Ultra Glossy Photo Paper (Other)
EPSON special paper
8" x 10"
5" x 7"
4" x 6"
L (3R)
*6
A4
Photo Paper (Others)
5" x 7"
4" x 6"
Note 1:For paper width and length, see Table 1-6, “Paper Width and Length,” on page 13.
Note *1 : Borderless printing supported.
*2 :Supported only by Epson Stylus T20/T20E/T23/T26/S20/T10/T11/ME30.
*3 :Borderless printing is supported only by Epson Stylus T20/T20E/T23/T26/S20/T10/
T11/ME30/T21/T24/T27/S21.
*4 :Not supported by Epson Stylus T20/T20E/T23/T26/S20/T10/T11/ME30/T21/T24/
T27/S21.
*5 :Supported only by Epson Stylus T21/T24/T27/S21.
*6 :Borderless printing supported only for Epson Stylus T21/T24/T27/S21.
*7 :
Supported only by Epson Stylus T20/T20E/T23/T26/S20/T10/T11/ME30.
Make sure that the paper is not wrinkled, fluffed, torn, or folded.
The curve of paper must be 5 mm or below.
When printing onto an envelope, be sure that the flap is on the
long edge and is folded.
Do not use the adhesive envelopes.
Do not use double envelopes and cellophane window envelopes.
PRODUCT DESCRIPTION Printer Specifications12
Epson Stylus C58/C59/ME 2/C79/D78/C90/C91/C92/D92/T20/T20E/T23/T26/S20/T10/T11/ME 30/T21/T24/T27/S21 Revision E
A
R-BL-B
C
A
B-R
B-L
D
Cut sheet
Borderless printing
*
Envelope
PAPER WIDTH AND LENGTH
Table 1-6. Paper Width and Length
Paper SizeWidthLength
A4210 mm (8.3")297 mm (11.7")
A5148 mm (5.8")210 mm (8.3")
A6148 mm (5.8")210 mm (8.3")
B5182 mm (7.2")257 mm (10.1")
Letter215.9 mm (8.5")279.4 mm (11")
Legal215.9 mm (8.5")355.6 mm (14")
Half Letter139.7 mm (5.5")215.9 mm (8.5")
Cut sheet
Envelope
8" x 10"
5" x 7"
4" x 7.11"
4" x 6"
L (3R)
User defined
No.10104.8 mm (4.125")241.3 mm (9.5")
DL110 mm220 mm
C6114 mm162 mm
203.2 mm254 mm
127 mm178 mm
101.6 mm180.6 mm
101.6 mm152.4 mm
89 mm (3.5")127 mm (5")
50.8-329 mm
(2-12.6")
127-1117.6 mm
(5-44")
1.2.2 Printable Area Size and Margins
Refer to the table and figure below for the printable area size and margins.
The ink cartridge that passes the expiration date should not be used.
The ink in the ink cartridge freezes at -16 °C (3.2 oF). Ink thaws
and is usable after approximately three hours at 25 °C (77oF).
1.2.4 Black Ink Save Mode
Black ink save mode allows you to print images with color ink only when the remain-
ing amount of black ink is low. This mode can be selected when the remaining amount
of color ink is sufficient since black areas of the images are printed with a mixture of
other colors.
Supported OS:Windows 98, ME, 2000, XP, XP x64, Vista
Macintosh OS X 10.3.9, 10.4.x, 10.5.x
NOTE: Windows Vista and Macintosh OS are for Epson Stylus T21/T24/
T27/S21 only.
Printing mode:Plain Paper & Text Mode (360 dpi)
Operating procedure
1.User carries out printing from an application.
2.The printer driver checks both the printing mode and the amount of remaining ink,
and displays the specific window if the conditions described below are all met.
• Selected printing mode supports black ink save mode.
• Remaining amount of black ink is less than 5%, or the status of the black ink
is “ink low”.
• Remaining amount of all the color ink is more than 10%, or the status of all
the color ink is NOT “ink low”.
PRODUCT DESCRIPTION Printer Specifications15
Flowchart 1-1. Black Ink Save Mode
Epson Stylus C58/C59/ME 2/C79/D78/C90/C91/C92/D92/T20/T20E/T23/T26/S20/T10/T11/ME 30/T21/T24/T27/S21 Revision E
1.3 Interface
Epson Stylus C58/C59/ME 2 and Epson Stylus C79/D78/C90/C91/C92/D92/T20/
T20E/T23/T26/S20/T10/T11/Epson ME 30/T21/T24/T27/S21 provide an USB
interface.
1.3.1 USB Interface
Standard:Based on Universal Serial Bus Specifications Revision 1.1,
Universal Serial Bus Device Class Definition for Printing
Devices Version 1.1
Descriptors:Based on Design Specification for USB Device Requests and
USB Descriptors for EPSON USB Printer
Product ID:0005h
Transfer rate:12 Mbps (Full Speed Device)
Cable length:Under 2 meters (6.6 feet)
Device ID
Table 1-16. Device ID
When IEEE 1284.4 is EnabledWhen IEEE 1284.4 is Disabled
@EJL[SP]ID[CR][LF]
MFG:EPSON;
CMD:ESCPL2,BDC,D4,D4PX;
MDL:Model Name;
CLS:PRINTER;
DES:EPSON[SP] Model Name;
[FF]
@EJL[SP]ID[CR][LF]
MFG:EPSON;
CMD:ESCPL2,BDC;
MDL:Model Name;
CLS:PRINTER;
DES:EPSON[SP] Model Name
[FF]
NOTE: “Model Name” represents each model name. (TBD)
PRODUCT DESCRIPTION Interface16
Epson Stylus C58/C59/ME 2/C79/D78/C90/C91/C92/D92/T20/T20E/T23/T26/S20/T10/T11/ME 30/T21/T24/T27/S21 Revision E
1.4 General Specifications
1.4.1 Electrical Specifications
Primary power input
Table 1-17. Primary power input
100-120 V model220-240 V model
Rated power supply voltage (ACV)100 to 120220 to 240
Input voltage range (ACV)90 to 132198 to 264
C58/C59/ME 2/C79/
D78/C90/C91/C92/D92/
Rated current (A)
Rated frequency (Hz)50 to 60
Input frequency range (Hz)49.5 to 60.5
Power consumption (W)
Note 1: This product complies with the “Energy Star” standards.
2: If the printer is not operated for more than five minutes, the standby function reduces
the current to the motor to conserve power.
T20/T20E/T23/T26/S20/
T10/T11/ME 30
T21/T24/T27/S210.4 (max. 0.8)
0.4 (max. 0.7)
11 (ISO10561 Letter Pattern)
2.5 (Sleep mode)3.0 (Sleep mode)
0.2 (Power off mode)0.4 (Power off mode)
0.2 (max. 0.4)
1.4.3 Safety Approvals
Table 1-19. Safety Approvals
100-120 V version220-240 V version
UL60950EN 60950
Safety standards
EMI
Note * : Only Epson Stylus T21/T24/T27/S21
CSA C22.2 No.60950GOST-R (IEC60950, CISPR22)
NOM-019-SCFI-1998
CNS14336 (IEC60950)
FCC part15 subpart B class BEN 55022(CISPR Pub.22) class B
CSA C108.8 Class BAS/NZS CISPR22 class B
CNS13438 Class B
*
*
*
K60950-1
IEC60950-1
KN22 Class B
KN61000-4-2/-3/-4/-5/-6/-11
*
*
1.4.4 CE Marking
220-240V version
Low voltage directive 73/23/EEC: EN60950
EMC directive 89/336/EEC:EN5502 Class B, EN61000-3-2,
EN61000-3-3, EN55024
*
*
*
Dielectric strength
AC1000 Vrms for 1 min. or AC1200 Vrms for 1 sec. (100-120V version)
Epson Stylus C58/C59/ME 2/C79/D78/C90/C91/C92/D92/T20/T20E/T23/T26/S20/T10/T11/ME 30/T21/T24/T27/S21 Revision E
27/80
30/86 35/95 40/10420/68
Temperature (°C/°F)
20
30
40
50
90
80
70
60
Humidity (%)
10/50
1.4.5 Environmental Performance
Table 1-20. Environmental Performance
ConditionTemperatureHumidity*
Operating
Not operating*
10 to 35°C
(50 to 95°F)*3*
-20to 40°C
1
(-4°F to 140°F)
4
20to80%*
Note *1 : After opening package
*2 : No condensation
*3 : One month at 40°C (104°F)
*4 : Under the following conditions:
5to85%
2
4
1 x 10-3 seconds
2 x 10-3 seconds
ImpactVibration
1G,
2G,
0.15G
0.50G
1.4.6 Durability
Total print life: 10,000 pages (A4, Letter) or three years (whichever comes first)
Printhead life: Seven billion shots (per nozzle) or five years (whichever comes first)
PRODUCT DESCRIPTION General Specifications18
Epson Stylus C58/C59/ME 2/C79/D78/C90/C91/C92/D92/T20/T20E/T23/T26/S20/T10/T11/ME 30/T21/T24/T27/S21 Revision E
Power Button
Power LED
Maintenance LED
Maintenance Button
1.5 Control Panel
1.5.1 Buttons
The control panel contains following two buttons (non-lock type), which are used to set
and execute some operations. The functions of each button are described in the table
below.
Table 1-21. Operations
ButtonFunction
PowerTurns on or off this unit.
When Paper out occurred
Loads paper.
When Paper jam occurred
Ejects paper.
When Double feed occurred
Clears the error and resumes the printing.
When Ink end or No ink cartridge occurred
Maintenance
Power + Maintenance
Moves the carriage to ink-check position.
When the carriage is in the ink-check position
Moves the carriage slightly to check the adjacent ink cartridge.
When the carriage is in “Ink low” or “Ink out” position
Moves the carriage to the replacement position.
During printing
Cancels the current print job.
When pressed for three seconds
Cleans the printhead.
When the printer is turning on
Print a nozzle check pattern.
*
When the printer is on
Shuts down the printer.
1.5.2 Indicators
The control panel contains following two LED to indicate some status.
Table 1-22. Indicators
LEDFunction
Power [Green]Lights while the printer is turned on.
Lights: Paper out, Paper jam, Double feed, No ink cartridge,
Maintenance [Red]
Flashes: Ink low
Ink end, Incorrect ink cartridge
Figure 1-2. Control Panel
Note * : Hold down [Maintenance] first and press [Power]. Keep the buttons pressed for over
seven seconds.
PRODUCT DESCRIPTION Control Panel19
Epson Stylus C58/C59/ME 2/C79/D78/C90/C91/C92/D92/T20/T20E/T23/T26/S20/T10/T11/ME 30/T21/T24/T27/S21 Revision E
1.5.3 Errors and Panel Status
Followings are the errors that occur on the printer:
Fatal error:Carriage control error.
Maintenance request:Waste ink pads need to be replaced.
Ink end:Ink has run out.
No ink cartridge:Ink cartridge(s) is not installed.
Incorrect ink cartridge:Non-genuine ink cartridge(s) is installed.
Paper jam:Paper remains in the paper path.
Paper out:Failed to load papers.
Double feed:Two or more papers have been fed during duplex printing.
Ink low (warning):Ink is running low.
Table 1-23. Errors and Panel Status
Printer Status
Power LEDMaintenance LED
Turning the power offFlashes fastOff1
Fatal errorOffFlashes fast2
Maintenance requestFlashes alternately3
Paper jam---On4
Paper out---On4
Double feed---On4
Ink cartridge replacementFlashes---5
Ink sequenceFlashes---6
Incorrect ink cartridge---On7
No ink cartridge/Ink end---On7
Data processingFlashes---8
Ink low---Flashes9
Turning the power onOn---10
Indicators
Priority
1.5.4 Printer Initialization
There are four kinds of initialization method, and the following explains each
initialization.
1.Power-on initialization
This printer is initialized when turning the printer power on, or printer recognized
the cold-reset command (remote RS command).
When printer is initialized, the following actions are performed.
(a) Initializes printer mechanism
(b) Clears input data buffer
(c) Clears print buffer
(d) Sets default values
2.Operator initialization
This printer is initialized when turning the printer power on again within 10
seconds from last power off, or printer recognized the -INIT signal (negative
pulse) of parallel interface.
When printer is initialized, the following actions are performed.
(a) Cap the printer head
(b) Eject a paper
(c) Clears input data buffer
(d) Clears print buffer
(e) Sets default values
3.Software initialization
The ESC@ command also initialize the printer.
When printer is initialized, the following actions are performed.
(a) Clears print buffer
(b) Sets default values
4. Power-on initialization except I/F
The printer recognized the IEEE 1284.4 “rs” command.
When printer is initialized, the following action is performed.
(a) Initializes printer mechanism
(b) Clears input data buffer
(c) Clears print buffer
(d) Sets default values except I/F
Note 1: “---”: no change
2: When multiple errors occur at the same time, the one with higher priority will be indicated.
PRODUCT DESCRIPTION Control Panel20
OPERATING PRINCIPLES
CHAPTER
2
Epson Stylus C58/C59/ME 2/C79/D78/C90/C91/C92/D92/T20/T20E/T23/T26/S20/T10/T11/ME 30/T21/T24/T27/S21 Revision E
PF motor
Carriage unit
CR motor
Pump unit
Clutch
Cam, large
Compression
spring
LD roller
Cam, small
CR encoder
sensor
CR timing belt
PF roller
PE sensor
Star wheel
rollers
Paper eject
roller
CR lock lever
Cap unit
Retard roller
2.1 Overview
This section describes the operating principles of the printer mechanism and electrical
circuit boards. The printer mechanism does not differ between the Epson Stylus C58/
C59/ME2 and Epson Stylus C79/D78/C90/C91/C92/D92/T20/T20E/T23/T26/S20/
T10/T11/Me 30/T21/T24/T27/S21.
2.2 Printer Mechanism
Printer mechanism of Epson Stylus C58/C59/ME 2 and Epson Stylus C79/D78/C90/
C91/C92/D92/T20/T20E/T23/T26/S20/T10/T11/ME 30/T21/T24/T27/S21 consists of
printhead, carriage mechanism, paper loading/feeding mechanism, and ink system.
As in the case of conventional models, Epson Stylus C58/C59/ME 2 and Epson Stylus
C79/D78/C90/C91/C92/D92/T20/T20E/T23/T26/S20/T10/T11/ME 30/T21/T24/T27/
S21 has two motors; one is a stepping motor for paper loading/feeding mechanism, and
the other is a DC motor for carriage mechanism.
Papers are fed from the backside and ejected from the front side of the printer.
Paper feeding mechanism feeds papers using the LD roller and the retard roller.
Figure 2-1. Printer Mechanism Outline
OPERATING PRINCIPLES Overview22
Epson Stylus C58/C59/ME 2/C79/D78/C90/C91/C92/D92/T20/T20E/T23/T26/S20/T10/T11/ME 30/T21/T24/T27/S21 Revision E
K#90
K#89
K#3
K#2
K#1
C#29
C#1
M#29
M#1
Y#29
Y#3
Y#2
Y#1
2.822mm
(40/360 inch)
0.2117mm
(1/120 inch)
Black
Color
Cyan: 29nozzles
Magenta: 29nozzles
Yellow: 29nozzles
Carriage Moving Direction
Paper Loading
Direction
2.2.1 Printhead Specifications
The Printhead of this product is a D2-CHIPS type.
Nozzle configuration
Monochrome 90 nozzles
Color 29 nozzles x 3 (Cyan, Magenta, Yellow)
The following shows the arrangement of the nozzles and the color arrangement of each
nozzle line when viewed the printhead from behind.
2.2.2 Carriage Mechanism
Main components of the carriage mechanism are carriage unit (including printhead,
CR encoder sensor), CR motor, timing belt, and CR scale.
2.2.2.1 CR Motor Specifications
Table 2-1. CR Motor Specifications
ItemSpecification
TypeMotor with DC brush
Drive voltage+42 V ± 5% (applied voltage to the driver)
Electric resistance28.8 Ω ± 10%
Inductance20.1 mH ± 25%
Drive methodPWM, constant-current chopping
Drive ICA6628
OPERATING PRINCIPLES Printer Mechanism23
Figure 2-2. Nozzle Rear View
Epson Stylus C58/C59/ME 2/C79/D78/C90/C91/C92/D92/T20/T20E/T23/T26/S20/T10/T11/ME 30/T21/T24/T27/S21 Revision E
2.2.3 Paper Feeding Mechanism
Paper loading/feeding mechanism consist of CR lock lever inside the ink system, LD
roller shaft (including clutch mechanism), and ASF unit.
CR lock lever and clutch mechanism play an important role in paper loading
mechanism. Refer to 2.2.3.2 Drive Process (p24) for details.
2.2.3.1 PF Motor Specifications (For both ASF and Pump motor)
Table 2-2. PF Motor Specification
ItemSpecification
Type4-phase, 48-pole PM stepping motor
Drive voltage+42 V ± 5% (applied voltage to the driver)
1.Drive of the PF motor is always transmitted to the paper eject roller and the PF
roller, however, it is not transmitted to the LD roller and the retard roller owing to
the clutch of the LD roller shaft.
2.The carriage unit moves to the ASF trigger position once the paper loading
command is received.
3.PF motor is rotated counter clockwise, and the clutch is released by the CR lock
lever.
4.After the clutch is released, the PF motor rotates clockwise. Drive is transmitted to
the LD roller and the paper loading operation begins.
5.During paper loading operation, papers are fed from the ASF unit to inside the
printer by the rotating movement of the two cams of the LD roller.
Cam, large:releases hopper
Cam, small:releases paper back lever
6.Once a sheet of paper is fed, the hopper and the paper back lever bring back rest of
the papers to the position in readiness by the rotating movement of the two cams
mentioned above.
7.When the LD roller is turned a full circle, the CR lock lever release the clutch and
the drive to the LD roller is interfered.
OPERATING PRINCIPLES Printer Mechanism24
Epson Stylus C58/C59/ME 2/C79/D78/C90/C91/C92/D92/T20/T20E/T23/T26/S20/T10/T11/ME 30/T21/T24/T27/S21 Revision E
2.2.4 Ink System Mechanism
The Ink system mechanism consists of pump mechanism and capping mechanism that
includes wiper mechanism.
2.2.4.1 Pump Unit Mechanism
When the PF motor turns, power is always transmitted to the ink system.
Table 2-3. PF Motor Rotational Direction & Ink System Mechanism
Direction*Function
CounterclockwiseAbsorbs the ink by the Pump Unit
ClockwiseRelease pump.
Note * :The PF Motor rotational direction = seen from the left side of the printer.
2.2.4.2 Capping Mechanism
The Capping mechanism covers the printhead with the cap to prevent the nozzle from
increasing viscosity when the printer is in stand-by state or when the printer is off.
OPERATING PRINCIPLES Printer Mechanism25
Epson Stylus C58/C59/ME 2/C79/D78/C90/C91/C92/D92/T20/T20E/T23/T26/S20/T10/T11/ME 30/T21/T24/T27/S21 Revision E
lock
lockisreleased
2.3 Power-On Sequence
This section describes the power-on sequences.
Condition: Normal power-on sequence
Completing ink charge.
No paper on the paper path.
The Printhead is capped with the Cap of the Ink System.
The Carriage is locked by the CR Lock.
Table 2-4. Normal power-on sequence
Operation
1. Checking waste ink overflow
2. Seeking the home position
2-1.The carriage moves to the 80-digit side slowly and confirms it
touches the CR lock.
2-2.The carriage moves to the 0-digit side slowly to leave from the CR
lock.
2-3.Checks if paper does not exist with the PE sensor and the PF Motor
rotates clockwise for two seconds to release the CR lock.
2-4.The carriage moves to the 80-digit side slowly and confirms that the
CR lock is released.
2-5.The carriage quickly moves to the 80-digit side by the Left Frame.
2-6.After the carriage continuously moves to the 80-digit side slowly
and confirms it touches the Left Frame, sets the distance from the
home position to the Left Frame as the theoretical value.
2-7.The carriage quickly moves to the 0-digit side and slows down as it
gets to its home position, and stops there.
*1
Carriage/PF roller
movement and position
Table 2-4. Normal power-on sequence
Operation
*1
4. CR measurement
4-1.The carriage moves back and forth between its home position and
the 80-digit side for two times.
5. Detecting ink cartridge and initializing ink system
5-1.The carriage moves to the 80-digit side for IES detection.
5-2.The carriage returns to its home position.
*2
5-3.The carriage slowly moves to the CR lock set position.
5-4.The PF motor rotates counterclockwise and sets the CR lock.
5-5.The carriage slowly returns to its home position.
* 4
Note *1 : The rotation direction of the PF Motor is as follows.
Clockwise direction: Paper is fed normally
Counterclockwise direction : Paper is fed backward
*2 : The conditions of the CR lock are as follows.
Red: CR lock is set
White: CR lock is released
*3 : Executed when the detected temperature is under 5 oC (41oF) by the thermistor on the
Printhead.
*4 : The empty sanction operation may occur depending on the situation.
Carriage/PF roller
movement and position
*2
3. Low temperature operation sequence
3-1.The carriage moves back and forth between its home position and
the 80-digit side for two times.
OPERATING PRINCIPLES Power-On Sequence26
*3
TROUBLESHOOTING
CHAPTER
3
Epson Stylus C58/C59/ME 2/C79/D78/C90/C91/C92/D92/T20/T20E/T23/T26/S20/T10/T11/ME 30/T21/T24/T27/S21 Revision E
W A R N I N G
C H E C K
P O I N T
3.1 Overview
This chapter describes how to solve problems.
Be careful to avoid electric shocks when checking the electrical
circuit boards (C664 MAIN, PSE and B circuit boards) while
the power is turned on.
Touching an FET, transistor or heat sink with one hand while
touching a metal part of the mechanism with the other hand
could result in an electric shock, so carefully avoid this.
After initial filling of ink has been repeated several times,
immediate moving or tilting of the printer could result in
leaking of ink that has not been completely absorbed by the
Waste Ink Pad. When initial filling of ink has been repeated
several times, check the ink remaining in the tip of the Waste
Ink Tube and the waste ink not absorbed by the Waste Ink
Pad before moving the printer.
Disassembly and reassembly of parts is often required when
identifying the causes of problems. The parts should be
disassembled and re-assembled correctly while referring to
DISASSEMBLY/ASSEMBLY (p31) so that the operation and
status of each check item can be correctly verified.
Some individual part and units may require adjustment once
they are removed or replaced. If removing or replacing parts
which have specific instructions for adjustment included in
DISASSEMBLY/ASSEMBLY (p31), be sure to make these
adjustments after repairing the problem location.
3.1.2 Preliminary Checks
Before starting troubleshooting, be sure to verify that the following conditions are all met:
The power supply voltage must be within the specification limits.
(Measure the voltage at the electrical outlet.)
The power cable must be free from damage, short circuit, or breakage, and must
not be miswired.
The printer must be grounded properly.
The printer should not be located in a place where it can be exposed to too high or
low temperature, too high or low humidity, or abrupt temperature change.
The printer should not be located near waterworks, near humidifiers, near heaters
or near flames, in a dusty atmosphere or in a place where the printer can be
exposed to blast from an air conditioner.
The printer should not be located in a place where volatile or inflammable gases
are present.
The printer should not be located in a place where it can be exposed to direct
sunlight.
The printer must be located in a well-ventilated place.
The printer must be placed on a strong and steady level table (without an
inclination larger than five degrees).
Be sure to use papers that conform to the specifications.
There should be no errors in handling of the printer.
Check the inside of the printer, and remove foreign matters if any, such as paper
clips, staples, bits of paper, paper dust or toner.
Clean the inside of the printer and the rubber rollers.
3.1.1 Specified Tools
This printer does not require any specified tools for troubleshooting.
TROUBLESHOOTING Overview28
Epson Stylus C58/C59/ME 2/C79/D78/C90/C91/C92/D92/T20/T20E/T23/T26/S20/T10/T11/ME 30/T21/T24/T27/S21 Revision E
3.2 Troubleshooting With LED Error Indications
LED error display, cause, and remedy are explained here.
Table 3-1. Troubleshooting With LED Error Indications
Error
Ink end/ No ink cartridge/
Incorrect ink cartridge
Paper Out---On
Double feed error---On
Paper jam---On
Maintenance request
(Waste ink overflow)
Fatal errorOffFlashes fast
LED status
PowerMaintenance
---On
Flashes alternately
CauseRemedy
• Ink inside Bk, Y, M, C cartridges has run out.
• Ink cartridge(s) is not installed.
• Non-genuine ink cartridge(s) is installed.
• Paper loading operation is executed when there is no paper.
• Papers stopped before the PE Sensor or could not be fed.
• Papers are fed without being placed against the right edge guide.
• Connector of the PE sensor is disconnected.
• When performing duplex printing, blank paper is ejected.
• The printer detected that the paper is too long upon ejection.
Even though paper feeding operation is carried out for
predetermined times, leading edge or back-end of the paper could
not be detected.
As a result of cleaning and flushing, total emission of ink has
exceeded the specific level.
• Home position of the carriage could not be detected.
• Abnormal external pressure is applied to the printer when the
power is on.
• Carriage movement is interfered during printing.
• Check the ink cartridge(s) and reinstall it correctly.
• Replace the ink cartridge(s) with a genuine one.
1. If there is no paper on the paper tray, load papers.
2. If the paper has stopped halfway, remove the paper, check if the
paper is not bent, fan the paper, and load it against the edge guide.
3. Press the [Maintenance] button to release the error.
1. Remove the blank paper, or check the paper size.
2. Press the [Maintenance] button to eject the paper and release the
error.
1. Press the [Maintenance] button on the panel.
2. If paper jam occurred again after pressing the button, open the
printer cover and remove all the papers inside the printer and
papers set on the hopper.
3. Making sure there is no paper inside the printer, load paper on the
hopper and press [Maintenance].
Replace the waste ink pad, and reset the waste ink counter using the
adjustment program. Refer to Chapter 5 “ADJUSTMENT” (p.69) for
details.
1. Turn the power off, wait for a few seconds, and turn the power
back on again.
2. If the fatal error still appears, turn the power off, remove the
papers on the hopper, and check the following:
• Open the printer cover, check the ink cartridges, and reinstall
them correctly.
• Check is there is no foreign material or papers inside the printer.
If there is any, remove them.
3. Turn the printer power on.
Note : “---”: no change.
TROUBLESHOOTING Troubleshooting With LED Error Indications29
Epson Stylus C58/C59/ME 2/C79/D78/C90/C91/C92/D92/T20/T20E/T23/T26/S20/T10/T11/ME 30/T21/T24/T27/S21 Revision E
3.3 Troubleshooting for Motors and Sensors
Motor
Table 3-2. Motor Resistance and Check Points
Motor nameTypeLocationCheck pointResistance
CR motorMotor with DC brushCN5Pin 1 & 228.8 Ω ± 10%
PF motor4-phase, 200-pole HB stepping motorCN6
Pin 1 & 3
Pin 2 & 4
4.3 Ω +8%/-
12%(20ºC)
Sensor
Table 3-3. Sensor Check
Sensor nameDetecting systemLocationSignal levelSensor status
PE sensorTransmission photo interrupter CN7 pin 1 & 2
2.6 V or morePaper loaded
0.4 V or lessNo paper
TROUBLESHOOTING Troubleshooting for Motors and Sensors30
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