Epson Stylus Photo 950 Service Manual
®
SERVICE MANUAL
Color Inkjet Printer
EPSON Stylus PHOTO 950
SEIJ01-015
Notice
All rights reserved. No part of this manual may be reproduced, stored in a retrieval system, or transmitted in any form or by any means electronic, mechanical,
photocopying, or otherwise, without the prior written permission of SEIKO EPSON CORPORATION.
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 contents of this manual are subject to change without notice.
All effort have been made to ensure the accuracy of the contents of this manual. However, should any errors be detected, SEIKO EPSON would greatly
appreciate being informed of them.
The above not withstanding SEIKO EPSON CORPORATION can assume no responsibility for any errors in this manual or the consequences thereof.
EPSON is a registered trademark of SEIKO EPSON CORPORATION.
General Notice: Other product names used herein are for identification purpose only and may be trademarks or registered trademarks of their respective owners.
EPSON disclaims any and all rights in those marks.
Copyright © 2002 SEIKO EPSON CORPORATION.
Imaging & Information Product Division
TPCS Quality Assurance Department
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/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 INJURIER 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 VOLTAGES IS THE SAME AS THE RATED VOLTAGE, LISTED ON THE SERIAL NUMBER/RATING PLATE. IF THE EPSON PRODUCT
HAS A PRIMARY AC RATING DIFFERENT FROM AVAILABLE POWER SOURCE, DO NOT CONNECT IT TO THE POWER SOURCE.
3. ALWAYS VERIFY THAT THE EPSON PRODUCT HAS BEEN DISCONNECTED FROM THE POWER SOURCE BEFORE REMOVING OR REPLACING PRINTED CIRCUIT
BOARDS AND/OR INDIVIDUAL CHIPS.
4. IN ORDER TO PROTECT SENSITIVE MICROPROCESSORS AND CIRCUITRY, USE STATIC DISCHARGE EQUIPMENT, SUCH AS ANTI-STATIC WRIST STRAPS, WHEN
ACCESSING INTERNAL COMPONENTS.
5. DO NOT REPLACE IMPERFECTLY FUNCTIONING COMPONENTS WITH COMPONENTS WHICH ARE NOT MANUFACTURED BY EPSON. IF SECOND SOURCE IC OR
OTHER COMPONENTS WHICH HAVE NOT BEEN APPROVED ARE USED, THEY COULD CAUSE DAMAGE TO THE EPSON PRODUCT, OR COULD VOID THE
WARRANTY OFFERED BY EPSON.
About This Manual
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 the 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 lists of
Epson-approved lubricants and adhesives required for
servicing the product.
APPENDIX Provides the following additional information for reference:
• Connector pin assignments
• Electrical circuit boards schematics
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, or WARNING messages.
A D J U S T M E N T
R E Q U I R E D
C A U T I O N
C H E C K
P O I N T
W A R N I N G
Indicates an operating or maintenance procedure, practice or
condition that is necessary to keep the product’s quality.
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, if not strictly observed, could result in injury or
loss of life.
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
Revision Issued Date Description
A April 5, 2002 First Release
CONTENTS
Chapter 1 PRODUCT DESCRIPTION
1.1 Overview................................................................................................................9
1.2 Specification........................................................................................................11
1.2.1 Printing specification ................................................................................. 11
1.2.2 Character specification .............................................................................. 12
1.2.3 Control code .............................................................................................. 12
1.2.4 Paper feeding ............................................................................................. 12
1.2.5 Paper specification ..................................................................................... 13
1.2.6 Printing area ............................................................................................... 14
1.2.7 Adjust Lever .............................................................................................. 15
1.2.8 Ink .............................................................................................................. 15
1.2.9 Input data buffer ........................................................................................ 16
1.2.10 Electrical specification ............................................................................ 16
1.2.11 Acoustic noise ......................................................................................... 17
1.2.12 CE Marking ............................................................................................. 17
1.2.13 Safety Approvals ..................................................................................... 17
1.2.14 Reliability ................................................................................................ 17
1.2.15 Environmental condition ......................................................................... 17
1.3 Printer Function .................................................................................................19
1.3.1 Operator controls ....................................................................................... 19
1.3.2 Operate switch ........................................................................................... 19
1.3.3 Indicators ................................................................................................... 19
1.3.4 Panel Functions ......................................................................................... 19
1.3.5 Special settings mode (*1) ......................................................................... 20
1.3.6 Printer condition and Panel status ............................................................. 21
1.3.7 Printer Initialization ................................................................................... 22
1.3.8 Default Values ........................................................................................... 23
1.3.9 Errors ......................................................................................................... 23
1.4 Physical specification..........................................................................................24
Chapter 2 OPERATING PRINCIPLES
2.1 Overview..............................................................................................................26
2.2 Printer Mechanism.............................................................................................26
2.2.1 Printhead .................................................................................................... 27
2.2.2 Carriage Mechanism .................................................................................. 28
2.2.3 Paper Feeding Mechanism ........................................................................ 30
2.2.4 Paper Loading Mechanism (ASF Unit) ..................................................... 34
2.3 Electrical Circuit Operating Principles............................................................43
2.3.1 Power Supply Circuit Operating Principles .............................................. 43
2.3.2 C456 Main Board ...................................................................................... 46
Chapter 3 TROUBLESHOOTING
3.1 Overview..............................................................................................................54
3.1.1 Communication Error ................................................................................ 55
3.1.2 Too Late Throughput ................................................................................. 55
3.1.3 Status Monitor does not operate ................................................................ 56
3.1.4 Troubleshooting with LED Error Indications ........................................... 57
3.1.5 Isolating the Faulty Part on the Power Supply Board ............................... 77
3.1.6 Isolating the Faulty Part according to the Phenomenon ............................ 79
Chapter 4 DISASSEMBLY AND ASSEMBLY
4.1 Overview..............................................................................................................92
4.1.1 Precautions ................................................................................................ 92
4.1.2 Tools .......................................................................................................... 93
4.1.3 Screws ....................................................................................................... 94
4.1.4 Work Completion Check ........................................................................... 95
4.2 Disassembly.........................................................................................................96
4.2.1 Housing Removal ...................................................................................... 97
4.2.2 Board Assembly Removal ....................................................................... 101
4.2.3 ASF Unit Removal .................................................................................. 105
4.2.4 Ink System Unit Removal ....................................................................... 107
4.2.5 Printhead Removal .................................................................................. 108
4.2.6 Carriage Unit / CR Guide Shaft Removal ............................................... 110
4.2.7 Star Wheel Roller Unit Removal ............................................................. 116
4.2.8 Front Paper Guide Removal .................................................................... 117
4.2.9 EJ Roller Unit Removal ........................................................................... 118
4.2.10 Lower Paper Guide Unit Removal ........................................................ 119
4.2.11 Motor Removal ...................................................................................... 120
4.2.12 Sensor Removal ..................................................................................... 122
4.2.13 PF Roller Unit Removal ........................................................................ 124
4.2.14 ASF Unit Disassembly .......................................................................... 125
4.2.15 ASF Assembly Points ............................................................................ 130
Chapter 5 ADJUSTMENT
5.1 Overview............................................................................................................133
5.1.1 Conditions for Each Adjustment ............................................................. 133
5.2 Adjustment........................................................................................................135
5.2.1 Setup the Adjustment Program ................................................................ 135
5.2.2 Head ID Input .......................................................................................... 136
5.2.3 CR motor drive dispersion measurement sequence ................................. 138
5.2.4 Ink Charge ............................................................................................... 139
5.2.5 Head Angular Adjustment. ...................................................................... 140
5.2.6 Bi-D Adjustment ..................................................................................... 144
5.2.7 USB ID Readout (Checking) ................................................................... 147
5.2.8 EEPROM Initialization ........................................................................... 149
5.2.9 Platen Gap Adjustment (Mechanism Adjustment) .................................. 151
5.2.10 Head Cleaning Operation ...................................................................... 154
5.2.11 Protection Counter Clear (and Check) .................................................. 155
5.2.12 First Dot Position Adjustment ............................................................... 157
Chapter 7 APPENDIX
7.1 Connector Summary........................................................................................175
7.1.1 Connectors and Pin Layouts .................................................................... 175
7.1.2 EEPROM Address Map .......................................................................... 179
7.1.3 CSIC address map (All color) ................................................................. 186
7.2 Electrical Circuits.............................................................................................187
Chapter 6 MAINTENANCE
6.1 Overview............................................................................................................159
6.1.1 ROM Replacement .................................................................................. 159
6.1.2 Cleaning ................................................................................................... 159
6.1.3 Service Maintenance ............................................................................... 160
6.1.4 Lubrication and Adhesion ....................................................................... 161
6.1.5 Lubrication the Carriage Guide Shaft ...................................................... 162
6.1.6 Lubrication .............................................................................................. 165
PRODUCT DESCRIPTION
CHAPTER
1
EPSON Stylus PHOTO 950 Revision A
1.1 Overview
This photo printer is designed for a wide user range, from home use through to office
use. It provides even faster speed and higher quality than previous models.
The main features of this printer are:
Suitable for CD-R label direct printing
Direct printing onto CD-R labels is possible. In addition, the CD-R tray can be
inserted into the front of the printer, and the position of the star wheel roller can be
changed using a lever.
FEATURES
High color print quality
High-quality and high-speed bi-directional printing
High photo quality using Photo Mach technology
2880 (H) x 1440 (V) dpi printing
6 color printing
Traditional Microweave, New Microweave
High-speed print
Built-in 2 I/F
Bi-directional parallel I/F (IEEE-1284 level 1 device)
USB I/F
Small and Compact
Used for Windows or Macintosh
Multi-size supported ASF
Provided as standard with an ASF that can handle paper sizes up to A4
Can print on thick paper using front paper feeding
Prints without curling at corners of A4 pages
Roll paper is available
CSIC-compatible independent color ink cartridges
Status information such as ink life is recorded by ink cartridges
Can also be used as a pseudo 4-color printer
Auto Cutter for Roll Paper is available
Figure 1-1. Product's external view
PRODUCT DESCRIPTION Overview 9
EPSON Stylus PHOTO 950 Revision A
ENCLOSED PARTS
User's manual
Ink Cartridges
CD-ROM (Printer Driver, Utility, Bundled Software)
Roll Paper Holder
Basket for Roll Paper
Front loading paper guide
Printing Kit for CD-R
Cutter Unit
OPTIONS
Ink cartridge
Black : T0331
Cyan : T0332
Light-cyan : T0333
Magenta : T0334
Light-magenta : T0335
Yellow : T0336
Various special paper
PRODUCT DESCRIPTION Overview 10
EPSON Stylus PHOTO 950 Revision A
1.2 Specification
1.2.1 Printing specification
PRINT METHOD
On demand ink jet
NOZZLE CONFIGURATION
Monochrome:96 nozzles x 2
Color :96 nozzles x 5
(Cyan, Magenta, Yellow, Light Cyan, Light Magenta)
The nozzle layout seen from behind the head is shown below.
PRINT DIRECTION
Text : Bi-directional shortest-direction printing, uni-directional printing
Graphics : Bi-directional shortest-direction printing, uni-directional printing
PRINT SPEED & PRINTABLE COLUMNS
Character mode
Print quality : Fine
Character pitch : 10 CPI (Pica)
Printable columns : 80
LQ speed : 240 CPS
(*)
NOTE: Do not mention this in the user's manual.
NOTE: This value
Raster graphics mode
(*)
is the speed of normal-dot printing.
Table 1-1. Printing Speed and Printing Resolution
Horizontal
resolution
360
Printable area Available dot CR Speed
220.9mm
(8.70inch)
2976
609.6mm/s
(24IPS)
Figure 1-2. Nozzle layout
720
1440
2880
220.9mm
(8.70inch)
220.9mm
(8.70inch)
220.9mm
(8.70inch)
5952
11904
23808
609.6mm/s
(24IPS)
609.6mm/s
(24IPS)
482.6mm/s
(19 IPS)
NOTE: Do not mention this in the user's manual.
PRODUCT DESCRIPTION Specification 11
EPSON Stylus PHOTO 950 Revision A
1.2.2 Character specification
CHARACTER TABLES
2 international character sets
PC 437 (US, Standard Europe)
PC 850 (Multilingual)
NOTE: Do not mention this in the user's manual.
TYPEFACE
Bit map LQ font
EPSON Courier 10 CPI
NOTE: Do not mention this in the user's manual.
1.2.3 Control code
ESC/P Raster command
EPSON Remote command
1.2.4 Paper feeding
FEEDING METHOD
Friction feed with ASF
Table 1-2. Paper Specifications for Paper Feeder
Size : A6 to A4 (Portrait)
Paper types
Cut Sheet
ASF
Roll Paper 89/100/127/210 mm wide special paper
Front feed slot CD-R tray/mat board paper, thickness 2.5 mm or less
LINE PITCH
Programmable in units of 4.23 mm (1/6 inch) or 0.0706 mm (1/360 inch)
PAPER INSERTION
• Normal paper (0.08 to 0.11 mm thickness)
• Special paper (genuine printing)
(max. thickness 0.27 mm)
•#10, DL, C6
Friction feed
Friction feed
FEED SPEED
110mm/sec : (13.527mm feed)
304.8mm/sec : (12 inch/sec) (Fast, continuous feed)
PRODUCT DESCRIPTION Specification 12
EPSON Stylus PHOTO 950 Revision A
1.2.5 Paper specification
CUT SHEET
Size
A4 (210mm x 297mm)
A5 (148mm x 210mm)
A6 (105mm x 148mm)
B5 (182mm x 257mm)
Letter (216mm x 279mm)
Half letter (139.7mm x 215.9mm)
Legal (216mm x 356mm)
Executive (184.2mm x 266.7mm)
2L (127mm x 177.8mm (5 x 7inch))
L (88.9mm x 127mm (3.5 x 5inch))
Quality
Plain paper, Bond paper
Thickness
0.08mm to 0.11mm (0.003 to 0.004inch)
ENVELOPE
Size
#10 (241.3mm x 104.8mm)
DL (220mm x 110mm)
C6 (162mm x 114mm)
Quality
Bond paper, PPC, Air mail
Weight
2
45g/m
to 75g/m2 (12lb to 20lb)
Flap shape
#10, DL, C6
Flap at lengthwise edge and should be folded closed
Weight
2
64g/m
to 90g/m2 (17lb to 24lb, 55kg to 78kg)
PRODUCT DESCRIPTION Specification 13
EPSON Stylus PHOTO 950 Revision A
1.2.6 Printing area
The printing area for this printer is shown below.
Table 1-3. Printing area for Stylus PHOTO 950
PW
Paper size
US
Legal
US
Letter
A4 210mm 297mm
B5 182mm 257mm
Photo Card
(4" x 6")
(paper
width)
216mm 356mm
216mm 279mm
113.6mm 175.4mm
NOTE: (*1) Bottom margin can be reduced to 3mm when paper dimension is
defined by using a command, otherwise it remains 14mm.
From lower end 3 mm to 14 mm area may be printed in bad
condition.
NOTE: (*2) There can be set all 0mm using a special command.
PL
(paper
length)
LM
(Left
margin)
(*2)
3mm
RM
(Right
margin)
(*2)
3mm
TM
(Top
margin)
(*2)
3mm
(Bottom
margin)
14mm/
3mm
BM
(*1)(*2)
Figure 1-3. Printing area
PRODUCT DESCRIPTION Specification 14
EPSON Stylus PHOTO 950 Revision A
1.2.7 Adjust Lever
The adjust lever should be set as follows depending on the type of paper being used.
Table 1-4. Adjust Lever Settings
Paper Type Adjust Lever Gap adjust
Cut Sheet, OHP, Label First Front Position 0mm
Envelope, Cardboard Second Front Position +1.3mm
CDR Third Front Position +2.7mm
- Back Position
NOTE: (*1)Full release position
NOTE: If the lever is set to "CD-R Tray", the star wheel roller will lift up so as
not to scratch the CD-R.
(*1)
-
1.2.8 Ink
INK CARTRIDGE
Type
Exclusive cartridge for each Color (On Carriage Type)
Color
Black, Magenta, Cyan, Yellow, Light Cyan, Light Magenta
Print capacity (360dpi)
Black ink 570 pages / A4 (ISO/TEC10561 Letter Pattern at 360dpi)
Color ink 440 pages / A4 (360 dpi, 5% duty each color)
Ink life
2 years from production date
Storage temperature
-20°C to 40°C (Storage, within a month at 40 °C)
-30°C to 40°C (Packing storage, within a month at 40 °C)
-30°C to 60°C (Transit, within 120 hours at 60°C and within a month at 40°C)
Dimension
12.7mm (W) x 71.2mm (D) x 66.5mm (H)
Weight
42g
PRODUCT DESCRIPTION Specification 15
EPSON Stylus PHOTO 950 Revision A
1.2.9 Input data buffer
256kByte
1.2.10 Electrical specification
Rated voltage
AC 220 to 240V
Input voltage range
AC 198 to 264V
Rated frequency range
50 to 60Hz
Input frequency range
9.5 to 60.5Hz
Rated current
0.15A(Max 0.3A)
Power consumption
Approx. 12W (ISO10561 Letter Pattern)
Approx. 3W in standby mode
Energy Star compliant
Figure 1-4. Ink Cartridge Dimensions
Dielectric strength
AC1500V rms. 1 minute (between AC line and chassis)
PRODUCT DESCRIPTION Specification 16
EPSON Stylus PHOTO 950 Revision A
1.2.11 Acoustic noise
Level : Approx. 45dB (A) (According to ISO 7779)
1.2.12 CE Marking
Low Voltage Directive 73/23/EEC : EN60950
EMC Directive 89/336/EEC : EN55022 class B
EN61000-3-2
EN61000-3-3
EN55024
1.2.13 Safety Approvals
Safety standards : EN 60950 (VDE)
EMI : EN 55022 (CISPR Pub.22) class B
AS/NZS 3548 class B
1.2.14 Reliability
Total print volume
25,000 pages (Black)/10,000 pages (Color) (A4, Letter)
Printhead Life
1.2.15 Environmental condition
TEMPERATURE
10 to 35°C (operating)
-20 to 60°C (non-operating)
NOTE: 1 month at 40
HUMIDITY
20 to 80% RH (operating)
5 to 85% RH (non-operating)
However, the conditions should be within the range of the graph as shown below.
°
C, 120 hours at 60°C
3000 million dots/nozzle
Figure 1-5. Temperature/Humidity Range
PRODUCT DESCRIPTION Specification 17
EPSON Stylus PHOTO 950 Revision A
RESISTANCE TO SHOCK
1G, within 1ms (operating)
2G, within 2ms (non-operating)
RESISTANCE TO VIBRATION
0.15G (operating)
0.50G (non-operating)
NOTE 1: You should check that the printhead is capped during storage.
NOTE 2: You should check that the printhead is capped during
transportation, and the ink cartridges should still be installed to
the printer at this time.
NOTE 3: If the printhead is not capped while the power is turned off, you
should turn the power on while the ink cartridges are still installed
to the printer. Once the printhead has been capped, then turn the
power back off.
NOTE 4: If the printer is left to stand at ambient temperatures of -4
°
C or
less, the ink inside the printhead and inside the ink cartridges will
freeze. If the ink has frozen, the printer will need to be left to stand
at an ambient temperature of 25
°
C before the ink can be used.
PRODUCT DESCRIPTION Specification 18
EPSON Stylus PHOTO 950 Revision A
1.3 Printer Function
1.3.1 Operator controls
The control panel is shown in the figure below.
Paper switch
Roll Paper switch
Figure 1-6. Operator controls
1.3.2 Operate switch
Ink switch
Roll Paper switch
Paper switch
Power switch
1.3.3 Indicators
Power : Green
Paper Error : Red
Ink Error : Red
Ink switch
Power switch
1.3.4 Panel Functions
Table 1-5. Normal Panel Functions
Switch Function
Paper
No Cutter
Roll Paper
Use Cutter
Ink
NOTE: (*1) Tear OFF
→
Cut by Cutter → Tear Off Return
As for the Tear Off execute, and, Tear Off isn't done again right
after loading paper.
NOTE: (*2) Pushing for 3 seconds.
Table 1-6. Panel Function with Power on
Switch Functions
Paper
Roll Paper
Paper
+
Roll Paper
Starts status printings
Change code pages / Select IEEE1284.4 mode
for parallel I/F
Enters the special settings mode
NOTE: (*3) According to the content of 1BH of EEPROM, one of following
actions is carried out.
Table 1-7. The Content of 1BH of EEPROM
[bit7][bit6] Action
00(H)
11(H)
01(H)
10(H)
Print firmware version, ink counter, selected code page and
nozzle check pattern
Start hex-dump printing
Start self test printing
• Loads or Ejects the Paper
• Return from Error
• Tear Off feed and return
• Load or Eject (Back Out feed) Roll paper
•Tear Off
• Load or Eject (Back Out feed) Roll paper
• Start the Ink Cartridge change sequence
• Cleaning
(*1)
(*2)
(*3)
(*4)
(*5)
(*2)
(*2)
NOTE: (*4) Not described in the User's manual.
NOTE: (*5) Not described in the User's manual.
Refer to 1.3.5 "Special settings mode (*1)" page 20
PRODUCT DESCRIPTION Printer Function 19
EPSON Stylus PHOTO 950 Revision A
1.3.5 Special settings mode
(*1)
Special demise mode is chosen by pushing the next switch in (three seconds) in the
time when error indicator blinks after the power supply is turned on with pushing paper
switch and roll paper switch.
Table 1-8. Special settings mode
Switch Functions
Paper Initialize EEPROM
Roll Paper
(Pushing for 10 seconds)
NOTE: (*1) Not described in the User's manual.
1. Initialize EEPROM
The operation procedure
Turn the printer on with the Roll Paper SW
pressed.
Release the Roll Paper SW.
Press the paper SW.
(*2)
Reset the ink overflow counter in EEPROM
ì
Response
Paper indicator and ink
indicator starts blinking
(blink 2).
2. Reset the ink overflow counter in EEPROM
The operation procedure
Response
Turn the printer on with the Roll Paper SW and
Paper SW pressed.
Paper indicator and ink
indicator starts blinking
Release the Roll Paper SW.
Press the Paper SW and keep it pressed.
(*2)
(blink 2).
(10 seconds later)
Power, paper and ink
indicators are lighted.
Paper and Ink indicators light for two
seconds.
Special setting mode is
finished, and printer restarts.
NOTE: (*2)Printer start normal mode if switch isn't pushed while LED is
blinking for 3 second.
Paper and Ink indicators light for one second.
Special setting mode is
finished, and printer restarts.
NOTE: (*2)Printer start normal mode if switch isn't pushed while LED is
blinking for 3 second.
PRODUCT DESCRIPTION Printer Function 20
EPSON Stylus PHOTO 950 Revision A
−
"
1.3.6 Printer condition and Panel status
Table 1-9. Panel status
Printer Status
Power Paper Ink
Power ON Condition On
Data processing Blink
Ink sequence Blink −−14
Indicator
Priority
−−
− −
16
15
" : Indicator status don't change.
Blink : The Redo of 0.5second On, 0.5second Off.
Blink 2 : The Redo of 0.2second On, 0.2second off, 0.2second On,
0.4second Off
High-speed Blink : The Redo of 0.1second On, 0.1second Off.
Alt Blink : The Redo of Paper and Ink Indicator.
(*1)Double feed error occur to Double-sided printing.
Ink cartridge change mode Blink
Ink level low (all colors) −−Blink 12
Paper out
Ink end (all colors) −−On 10
No Ink Cartridge (all colors)
Double feed error
Paper jam condition
Paper thickness error − On − 6
Cutter jam condition
Adjust lever error −
Cutter position error Off Blink On 3
Fatal error Off On On 2
Maintenance request
(Ink Overflow Counter error)
Reset, Timer IC reset, EEPROM clear On (1s) On (1s) On (1s) -
Ink Overflow Counter reset On (2s) On (2s) On (2s) -
Special setting Blink 2 Blink 2 Blink 2 -
(*1)
−
− −
−
−
−
Off Alt Blink Alt Blink 1
− −
On
On
Blink
Blink
Highspeed
Blink
−
On 9
−
−
−
− 4
13
11
8
7
5
PRODUCT DESCRIPTION Printer Function 21
EPSON Stylus PHOTO 950 Revision A
1.3.7 Printer Initialization
There are four kinds of initialization method.
Power-on initialization
Power-on initialization
This printer is initialized when printer recognized the cold-reset command
(remote RS command).
When printer is initialized, the following actions are performed.
This printer is initialized when turning the printer power on.
When printer is initialized, the following actions are performed.
Initialize printer mechanism
Eject Paper
Clear input data buffer
Clear print buffer
Set default values
Software Initialization
The ESC @ command also initializes the printer.
When printer is initialized, the following actions are performed.
Clear print buffer
Set default values
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.
Cap the printhead
Initialize printer mechanism
Eject Paper
Clear input data buffer
Clear print buffer
Set default values
Clear input data buffer
Clear print buffer
Set default values
PRODUCT DESCRIPTION Printer Function 22
EPSON Stylus PHOTO 950 Revision A
1.3.8 Default Values
Default Values described above are as follows:
A part of the memory contents remain their values in case of panel setting, DEFAULT
setting or Remote command.
Page Position : Now Position
Line Feed Values : 4.23mm (1/6inch)
Right Margin : 80columns
Left Margin : 1column
Character pitch : 10CPI
Printing Mode : Text Mode
1.3.9 Errors
Printer becomes error condition when the following conditions are detected.
Concerning I/F signals, ERROR is set to "low", BUSY is set to "high", and data input
is prohibited. Then, the printer stops its movement. Exceptionally, the printer continue
to move when it's communicating by the IEEE1284.4 protocol.
Ink out
When the printer has almost run out of ink in any cartridge, it indicates Ink
low warning and keeps printing.
When the printer has completely run out of ink in any cartridge, it indicates
Ink out error.
Paper out
When printer fails to load a sheet, it goes Paper out error.
Paper jam
When printer fails to eject a sheet, it goes Paper jam error.
Paper obstruction
A paper obstruction is considered, and made error at the time of power supply
on when the excretion of the form isn't made of the FF command or the Paper
SW when the excretion of the remaining paper can't do it by the paper feed
action of the number of provision step.
No Ink Cartridge/ Ink Cartridge error
When printer detects that ink-cartridge comes off, it goes this error mode.
When the printer can't read/write CSIC information of any ink cartridge, it
indicates Ink cartridge error.
Maintenance request
When the total quantity of wasted ink used for cleaning and flushing reaches
the limit, the printer indicates this error and stops printing. The absorber in the
printer enclosure is needed to be replaced with new one by a service person.
PRODUCT DESCRIPTION Printer Function 23
EPSON Stylus PHOTO 950 Revision A
Fatal error
Carriage control error or CG access error.
Adjust lever position error
It is made error when Adjust lever is in the integrity of a release.
It is made error when printout mode isn't suitable toward the platen gap.
Panel should invalidate it at the time of the error, and printout becomes
cessation.
Paper thickness error
When the gap between the printer head and a piece of paper is too narrow
because the piece of paper set to the printer is thick, the printer indicates Paper
thickness error. And it stops printing.
Double feed error
When pieces of paper are piled up on ASF in double-side printing mode, or
when the printer detects paper deviation, it indicates Double feed error. And it
stops printing.
Cutter position error
1.4 Physical specification
DIMENSIONS
515mm (W) × 332.8mm (D) × 209mm (H) : Storage
515mm (W) × 663mm (D) × 299mm (H) : Printing
515mm (W) × 626mm (D) × 299mm (H) : Used cutter
WEIGHT
Normal Weight : 7.6kg
Weight with Cutter : 8.6kg
PHYSICAL DIMENSIONS
It is made error when the cutter doesn't return to the Home position after the
cutter action or after Mechanical initializing.
Cutter jam error
When the printer can't cut paper in enabling cutter mode, it indicates Cutter
jam error.
NOTE: Refer to 1.3.6 "Printer condition and Panel status" for details on each
indicator.
299
663
515
Figure 1-7. Physical dimensions
PRODUCT DESCRIPTION Physical specification 24
OPERATING PRINCIPLES
CHAPTER
2
EPSON Stylus PHOTO 950 Revision A
2.1 Overview
This section describes the operating principles of the printer mechanism and electrical
circuit boards. The main components of the printer are as follows.
Printer Mechanism
Main board : C456MAIN
Power supply board : C456PSB/PSE
2.2 Printer Mechanism
One of the major features of this printer is that it uses DC motors as the devices that
provide movement. This results in improved printing accuracy and improved paper
feed accuracy, and greatly reduces the amount of extraneous noise during printing. The
types of motor used and their applications are given below.
Table 2-1. Motors
Motor Type Applications/Functions
This is used to drive the carriage. It makes almost no
CR motor
PF motor
Pump motor
DC motor
DC motor
4-phase 48-pole
PM-type
Stepping Motor
noise when the carriage is being driven. However, a
linear scale is provided so that the current drive
status can be ascertained.
This is used as the source of power to drive the paper
feed rollers during constant length feed and paper
eject operations. A loop scale is provided on the
surface of the high-precision gear so that the paper
feed pitch status can be ascertained.
This is used to drive the pump. Because it is a
stepping motor, it does not require scales or photo
sensors in order for the current drive status to be
ascertained.
A general diagram of the printer mechanism is shown in the following figure.
Adjust lever
PG sensor Release sensor
CR motor
PF encoder
PF timing
belt
Clutch
mechanism
PF motor
PF roller
Carriage
LD roller
LD Roller
unit
PW sensor
Paper Back
CR sensor
Print
separation
head
Paper eject
roller
CR lock
lever
ASF hopper
spring
PE sensor
Silence cam
Pump
assembly
Rotary
scale
shaft
lever
Paper
pad
Pump
motor
Cap
assembly
CR guide
shaft
Linear
scale
Timing belt
Figure 2-1. Printer Mechanism block diagram
OPERATING PRINCIPLES Overview 26
EPSON Stylus PHOTO 950 Revision A
2.2.1 Parenthood
The printhead uses a new developed G-MACH head and Stylus PHOTO 950 can
perform variable dot printing.
The CSIC-chip is mounted on the ink cartridge. By storing ink life data, this IC makes
it possible to control the ink in ink cartridge unit.
The basic operating principles of the printhead, which plays a major role in printing,
are the same as previous models; on-demand method which uses PZT (Piezo Electric
Element). In order to uniform the amount of ejecting ink, the printhead has its own
head ID (19 digits for this printhead) which adjust PZT voltage drive features.
The printhead stores the head ID to EEPROM and generates appropriate PZT drive
voltage to prevent amount of ink from varying by printheads.
Following explains printhead basic components.
PZT
PZT is an abbreviation of Piezo Electric Element. Certain amount of voltage
expands and contracts PTZ. The drive wave generated on MAIN board drives PZT
and PZT pushes the top cavity which has ink stored to discharge the ink from each
nozzle on the nozzle plate.
Ink Cavity
The ink absorbed from the ink cartridge goes through the filter and then is stored
temporarily in this tank called “cavity” until PZT is driven.
CSIC
Ink Cartridge
Cavity
Nozzle Plate
PZT
Figure 2-2. Printhead Sectional Drawing (Image)
Nozzle Selector
Board
Electrodes for
CSIC-chip
Filter
Nozzle Plate
The board with nozzle holes on the printhead surface is called Nozzle Plate.
Electrodes for CSIC-chip
The communication between CSIC-chip and main unit is performing via the
electrodes on the carriage.
Filter
When the ink cartridge is installed, if any dirt or dust around the cartridge needle is
absorbed into the head, there is a great possibility of causing nozzle clog and
disturbance of ink flow, and finally causing alignment failure and dot missing. To
prevent this problem, a filter is set below the cartridge needle, where ink is filtered.
OPERATING PRINCIPLES Printer Mechanism 27
EPSON Stylus PHOTO 950 Revision A
2.2.2 Carriage Mechanism
The carriage mechanism consists of components such as a carriage motor (CR motor),
carriage guide shaft, platen gap adjustment mechanism, parallelism adjustment
mechanism and a carriage lock mechanism.
2.2.2.1 Carriage Motor (CR Motor)
The carriage mechanism used in this printer uses a DC motor as the drive source, in the
same way as in previous models. The specifications for the DC motor used to drive the
carriage mechanism are shown below.
Table 2-2. Carriage Motor Specification
Items Specifications
Type
Drive Voltage
Coil Resistance
Inductance
Drive Method
Driver IC
+42 +/- 5 % (DRV IC voltage)
23.0Ω +/- 25 % (per phase at 25 degree)
24.0 mH +/- 25% (1KH 1VmA)
PWM drive, Constant current chopping
The CR motor in previous models was a stepping motor, and the position of the
carriage unit was controlled by means of open loop control. However, this printer
employs closed loop control via the DC motor and a linear encoder to control the
carriage speed and position in order to provide the same stable printing quality as the
EPSON Stylus PHOTO 890.
At the same time, the CR motor is also used to generate the basic signal (PTS signal)
that is used to regulate the ink ejection timing (See "CR Motor Driver Circuit" on page
50 for details on the CR motor control circuit.)
DC motor
A3958
Parallelism
adjustment
bushing
CR guide
shaft
Linear scale
CR motor
Platen surface Carriage
CR guide shaft
unit
Figure 2-3. Carriage Mechanism (TOP VIEW)
During printing, the carriage unit is moved within the printing area by the CR motor
along the carriage guide shaft of the printer mechanism.
OPERATING PRINCIPLES Printer Mechanism 28
EPSON Stylus PHOTO 950 Revision A
2.2.2.2 Platen Gap Adjustment Mechanism and Parallelism Adjustment Mechanism
The adjust lever is installed to the left end of the carriage guide shaft.
The carriage guide shaft is an eccentric shaft that rotates when the adjust lever is
operated in order to increase or decrease the gap (platen gap or PG) between the platen
surface and the surface of the printhead. This mechanism allows the user to select the
optimum platen gap in accordance with the desired printing results or in accordance
with other printing conditions such as paper curl. (See Table 2-3.)
In addition, the parallelism adjustment levers that are installed to the left and right ends
of the carriage guide shaft adjust the degree of parallelism between the carriage guide
shaft and the platen.
Table 2-3. Adjust Lever Settings
Paper Type Adjust Lever Gap adjust
Cut Sheet, OHP, Label First Front Position 0mm
Envelope, Cardboard Second Front Position +1.3mm
CDR Third Front Position +2.7mm
- Back Position
NOTE: (*1)Full release position
The printer can detect the position of the adjust lever by means of the release sensor
and the PG sensor.
(*1)
-
2.2.2.3 Carriage Home Position Detection
The method used to detect the carriage home position is the same method used in
previous model (EPSON Stylus PHOTO 890) whereby the CR motor drive current and
the speed and position signals from the linear encoder are used to detect the position.
(See "CR Motor Driver Circuit" on page 50 for further details.)
OPERATING PRINCIPLES Printer Mechanism 29
EPSON Stylus PHOTO 950 Revision A
2.2.3 Paper Feeding Mechanism
The Paper Feeding mechanism consists of components such as ASF, Manual Feed
Mechanism and Roll paper holder.
2.2.3.1 ASF Mechanism
The paper feeding mechanism consists of Paper feed motor (PF motor), PF roller,
Paper eject roller, Star wheel roller, and so on. The paper feeding mechanism feeds
paper loaded from ASF using the PF roller and Paper Eject Roller & Star wheel roller.
For this mechanism, the PF motor mentioned in the following Table 2-4 is used on this
product.
Table 2-4. PF Motor Specifications
Item Description
Motor type
Drive voltage
Coil Resistance
Inductance
Driving method
+42V +/- 5% (DRV IC voltage)
30.5Ω +/- 15% (per phase at 25 degree)
22.8mH +/- 15% (1kH 1Vrms)
PWM drive (PWM means Pulse Width Modulation)
DC motor
The paper feed motor used in previous models was a stepping motor and control was
carried out by means of open loop control. However, this printer employs closed loop
control via a DC motor and a rotary encoder to control the carriage speed and position
in order to improve the paper feeding accuracy. The rotary encoder is installed to the
left end of the PF roller shaft and controls the paper feeding amount. See "PF Motor
Driver Circuit" on page 50 of this chapter for details of the PF motor control circuit.
The PF motor drive force is transmitted to the PF roller and the paper eject roller along
the route described below.
PF roller drive force transmission route
PF motor pinion gear → PF rotary encoder → PF roller
Paper eject roller drive force transmission route
PF motor pinion gear → Combination gear 9.5, 14.7 → Paper eject roller
A diagram of the PF motor drive force transmission route, including the names of the
components included in this route, is shown on the following page. The paper is
transported along the following path by means of the above drive force transmission
routes.
Combination gear
12, 16
PF rotary
encoder
Spur gear 12
PF motor
pinion gear
Spur gear 21.5
Combination gear
9.5, 14.7
Figure 2-4. Paper Feeding Mechanism 1
OPERATING PRINCIPLES Printer Mechanism 30
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