Epson 750 Printer User Manual

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 © 1998 SEIKO EPSON CORPORATION. Printed in Japan.
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.
About This Manual
This manual describes basic functions, theory of electrical and mechanical operations, maintenance and repair procedures of EPSON Stylus Photo
750. 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.
Contents
Symbols Used in This Manual
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
Provides the step-by-step procedures for the
troubleshooting.
CHAPTER 4. DISASSEMBLY AND ASSEMBLY
Describes the step-by-step procedures for
disassembling and assembling the product.
CHAPTER 5. ADJUSTMENTS
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
• Electric circuit boards components layout
• Exploded diagram
• Electrical circuit boards schematics
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 WARNING, CAUTION or NOTE
messages.
Indicates an operating or maintenance procedure, practice
or condition that, if not strictly observed, could result in injury
or loss of life.
C A U T IO N
C H E C K
P O IN T
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.
Revision Status
Revision
Rev. A
Issued Date
December 14, 1998
Description
First Release
Stylus Photo 750
Revision A
Table of Contents
Product Description
Consumables and options....................................................................... 26
Overview......................................................................................................... 4
General Characteristics............................................................................. 4
Operating Principles
General Description........................................................................................ 5
Printing ...................................................................................................... 5
Paper Feeding........................................................................................... 6
Paper Specification ................................................................................... 6
Printable Area............................................................................................ 7
Adjust Lever Settings ................................................................................ 8
Environmental Conditions ......................................................................... 9
Ink Cartridge............................................................................................ 10
Input Data Buffer ..................................................................................... 11
Electric Specification ............................................................................... 11
Reliability ................................................................................................. 11
Safety Approvals ..................................................................................... 11
Acoustic noise ......................................................................................... 11
CE Marking.............................................................................................. 12
Printer Language and Emulation............................................................. 12
Overview ...................................................................................................... 28
Printer Mechanism .................................................................................. 28
Parallel Interface........................................................................................... 14
Parallel Interface(Forward channel) ........................................................ 14
Parallel Interface(Reverse channel) ........................................................ 15
Serial Interface ........................................................................................ 18
USB(Universal Serial Bus) Interface ....................................................... 19
Prevention of data transfer time-out on the host ..................................... 20
Interface selection ................................................................................... 20
IEEE 1284.4 protocol .............................................................................. 20
Disassembly and Assembly
Function........................................................................................................ 21
Control Code ........................................................................................... 21
Bi-directional Command .......................................................................... 21
Control Panel........................................................................................... 21
Special Setting Mode .............................................................................. 22
LED Indications ....................................................................................... 22
Errors....................................................................................................... 23
Initialization.............................................................................................. 24
Initialization Setting ................................................................................. 25
Physical Specification.............................................................................. 25
Operating Principles of Electric Circuit ......................................................... 30
C257 PSB Power Supply Circuit ............................................................. 30
C259 Main Control Circuit ....................................................................... 32
Troubleshooting
Overview ...................................................................................................... 39
Unit Level Troubleshooting........................................................................... 41
Unit Repair (Power Supply Board) ............................................................... 44
Repair of the Control Board.......................................................................... 45
Unit Repair (Printer Mechanism) .................................................................. 47
Overview ...................................................................................................... 51
Precautions ............................................................................................. 51
Tools ....................................................................................................... 51
Work Completion Check ......................................................................... 52
Disassembly ................................................................................................. 53
Housing Removal .................................................................................... 54
Circuit Boards Removal .......................................................................... 55
Control Panel Removal ........................................................................... 57
Absorber Tray, Assembly;A Removal ..................................................... 58
Printer Mechanism Removal ................................................................... 59
Adjustment
Overview ...................................................................................................... 77
Required Adjustment............................................................................... 77
Adjustment ................................................................................................... 78
1
Stylus Photo 750
Revision A
Paper Gap Adjustment ............................................................................ 78
Adjustment by Adjustment Program ............................................................. 80
Adjustment Program................................................................................ 80
Setting Destination Information ............................................................... 82
Head Voltage ID Adjustment ................................................................... 83
Head Angular Adjustment ....................................................................... 84
Bi-D Adjustment ...................................................................................... 86
Head Cleaning......................................................................................... 87
Initial Ink Charge .................................................................................... 88
Counter Value for Ink Absorber............................................................... 89
Maintenance
Overview....................................................................................................... 91
Cleaning .................................................................................................. 91
Service Maintenance............................................................................... 91
Lubrication............................................................................................... 92
Appendix
Connector Summary..................................................................................... 97
Major Component Unit ............................................................................ 97
Component Layout ..................................................................................... 100
Exploded Diagram ...................................................................................... 102
Electric Circuit............................................................................................. 105
2
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4
PRODUCT DESCRIPTION
EPSON Stylus Photo 750
Revision A
1.1 Overview
This printer has better mechanism for the print quality and paper
feeding than that of Stylus Photo and Stylus Photo 700. It also uses new
print head and improved printing speed and through put.
1.1.1 General Characteristics
Major features of this printer are as follows;
† High quality color printing
„ Bi-directional printing at the resolution of 720 dpi.
„ 1440 (H) x 720 (V) dpi printing
„ Photo-MACH technology (6 color printing. CMYKcm)
„ Super micro dot, Super micro weave printing
† Built-in auto sheet feeder
„ Holds 100 cut-sheet (55g/m2)
„ Holds 10 envelopes
„ Holds 10 transparency films
Figure 1-1. Exterior View of Stylus Photo 750
„ Holds 65 sheets of special paper
† Built-in 3 I/Fs
„ Bi-directional parallel I/F (IEEE-1284 level 1 device)
„ Mac serial I/F(up to approx.1.8Mbps)
„ USB I/F
† Windows/Macintosh exclusive
Product Description
Overview
4
EPSON Stylus Photo 750
Revision A
1.2 General Description
PRINTING SPEED AND PRINTABLE COLUMNS
† Character mode
1.2.1 Printing
Table 1-1. Printing Speed
PRINTING METHOD
Character Pitch
Printable columns
LQ speed
† On demand ink jet
10 CPI (Pica)
80
200CPS**
NOZZLE CONFIGURATION
† 48 nozzles x 6 (Black, Cyan, Magenta, Yellow, Light Cyan, Light
Magenta)
** This value is the speed of one print-pass in which the 1/3 of character
matrix is printed.
† Raster graphics mode
Table 1-2. Raster Graphics Mode
(3 /3 6 0 ")
0 .2 1 2 m m
# 4 8
# 1
Horizontal
resolution
Printable area
Available dot
CR Speed
180 dpi
8.26 inch
1488
20 IPS
360 dpi
8.26 inch
2976
20 IPS
720 dpi
8.26 inch
5952
20 IPS
CONTROL CODE
† ESC/P Raster
B k
C y a n
L C
M
L M
† EPSON Remote command
Y
Figure 1-2. Nozzle Configuration
s p 0 2
CHARACTER TABLES
† 2 international character sets
PRINTING DIRECTION
„ PC437 (US, Standard Europe)
† Bi-direction with logic seeking
„ PC850 (Multilingual)
Product Description
General Description
5
EPSON Stylus Photo 750
Revision A
„ Thickness: 0.08mm(0.003”)-0.11mm(0.004”)
TYPEFACE
† Bin map LQ font: EPSON Courier, 10 CPI
1.2.2 Paper Feeding
64g/m2(17lb.) - 90g/m2(24lb)
„ Quality:
Exclusive paper, Bond paper, PPC
† Transparency and Glossy Paper
† Feeding Method: Friction feed with ASF
„ Size:
† Paper Path:
Cut-sheet ASF(Top entry)
† Feeding Speed:
2.36 inches/sec (normal speed mode/continuous
feeding)
4.5 inches/sec (high-speed mode/continuous
feeding)
This section describes the printable area and types of paper which can
be used in this printer.
„ No curled, wrinkled, scuffing or torn paper be used.
„ Printing should be performed at room temperature
for transparency and envelope.
A4(Width 210mm(8.3”) x Length 297mm(11.7”)
Letter(Width 216 mm(8.5”) x Length 279mm(11.0”)
„ Thickness: 0.075mm(0.003”) - 0.085mm(0.0033”)
Note) Transparency printing is only available at normal temperature.
† Envelope
„ Size:
1.2.3 Paper Specification
C A U T IO N
„ Weight:
No.10 Width 241mm(9 1/2”) x Length 104.8mm(4 1/8”)
DL Width 220mm(8.7”) x Length 110mm(4.3”)
C6 Width 162mm(6.4”) x Length 114mm(4.5”)
„ Thickness: 0.16mm(0.006”) - 0.52 mm(0.02”)
„ Weight:
45g/m2(12lb) - 75g/m2(20lb.)
„ Quality:
Bond paper, Plain paper, Air mail
Note) Envelope printing is only available at normal temperature.
Keep the longer side of the envelope horizontally at setting.
† Cut Sheet
„ Size:
† Index Card
A4(Width 210mm(8.3”) x Length 297mm(11.7”))
Letter(Width 216mm(8.5”) x Length 279mm(11.0”))
Legal(Width 216mm(8.5”) x Length 356 mm(14.0”))
Statement (Width 139.7mm(5.5”) x Length 215.9mm
(8.5”))
B5(Width 182mm(7.2”) x Length 257 mm(10.1”))
Executive(Width 184.2 mm(7.25”) x Length 266.7mm
(10.5”))
Photo Paper (Width 101.6mm(4”) x Length 152.4mm(6”))
Product Description
„ Size:
A6 Index Card: Width 105mm(4.1”) x Length
148mm(5.8”)
A5 Index Card: Width 148mm(5.8”) x Length 210mm
(8.3”)
5x8” Index Card: Width 127mm(5.0”) x Length 203mm
(8.0”)
10x8” Index Card: Width 127mm(5.0”) x Length 203 mm
(8.0”)
„ Thickness: Less than 0.23mm(0.0091”)
General Description
6
EPSON Stylus Photo 750
Revision A
1.2.4 Printable Area
† Cut Sheet
Table 1-3. Printable Area
The figure below shows printable area.
L M
R M
T M
B M
Figure 1-3. Printable Area
Product Description
Paper
Width
(typ)
Paper
Length
(typ.)
Left
Margin
(min.)
Right
Margin
(min.)
A4
210mm
(8.3”)
297mm
(11.7”)
3mm
(0.12”)
3mm
(0.12”)
Letter
216mm
(8.5”)
279mm
(11.0”)
Legal
216mm
(8.5”)
356mm
(14.0”)
3mm
(0.12”)
Statement
139.7mm
(8.5”)
215.9mm
(8.5”)
B5
182mm
(7.2”)
Executive
Photo
Paper
P L
P r in ta b le a r e a
P W
Paper Size
Top
Margin
(min.)
Bottom
Margin
(min.)
3mm
(0.12”)
14mm(0.54”)
/3mm
(0.12”)*
3mm
(0.12”)
14mm(0.54”)
/3mm
(0.12”)*
9mm
(0.35”)
3mm
(0.12”)
14mm(0.54”)
/3mm
(0.12”)*
3mm
(0.12”)
3mm
(0.12”)
3mm
(0.12”)
14mm(0.54”)
/3mm
(0.12”)*
275mm
(10.1”)
3mm
(0.12”)
3mm
(0.12”)
3mm
(0.12”)
14mm(0.54”)
/3mm
(0.12”)*
184.2mm
(7.25””)
266.7mm
(10.5”)
3mm
(0.12”)
3mm
(0.12”)
3mm
(0.12”)
14mm(0.54”)
/3mm
(0.12”)*
101.6mm
(4”)
152.4mm
(6”)
3mm
(0.12”)
3mm
(0.12”)
3mm
(0.12”)
14mm(0.54”)
/3mm
(0.12”)*
3mm
(0.12”)
9mm
(0.35”)
Note) Bottom margin can be set up to 3mm at minimum when the paper
length is designated with “ESC(S” command.)However, there is the
possibility that a printing scrambles in the area ranging from 3mm to
14mm, from the form lower end. When the paper length is not
designated, the bottom margin must be wider than 14 mm.
General Description
7
EPSON Stylus Photo 750
Revision A
† Envelope
1.2.5 Adjust Lever Settings
Table 1-4. Envelope
The adjust lever located under the printer cover(right side) needs to be
set for the proper paper setting according to the paper type.
Paper Size
LM(Left
margin)
(min.)
RM(RIght
margin)
(min.)
TM(Top
margin)
(min.)
BM(Bottom
margin)
(min.)
#10
28mm(1.10”)
3mm(0.12”)
3mm(0.12”)
14mm(0.55”)
Paper
Lever position
Adjustment Value
DL
7mm(0.28”)
3mm(0.12”)
3mm(0.12”)
14mm(0.55”)
C6
3mm(0.12”)
3mm(0.12”)
3mm(0.12”)
14mm(0.55”)
Normal paper,
Transparency
sheet, Label
+
+0.9mm
Envelope
0
0mm
L M
Table 1-5. Setting Position of Adjust Lever
R M
T M
P r in ta b le A r e a
B M
Figure 1-4. Printable Area
Figure 1-5. Adjust Lever
Product Description
General Description
8
EPSON Stylus Photo 750
Revision A
† Resistance to shock:
1.2.6 Environmental Conditions
† Temperature:
„ Operating:
1G, within 1ms
2G, within 2ms(*1)
„ Operating:
10 to 35°C(*3)
„ Non-operating:
„ Non-operating:
-20 to 60°C(*1)
† Resistance to vibration:
NOTE: 1 month at 40°C and 120 hours at 60°C
† Humidity:
„ Operating:
20 to 80% RH(*2,*3)
„ Non-operating:
5 to 85% RH(*1,*2)
„ Operating:
0.15G
„ Non-operating:
0.50G (*1)
NOTE: *1:with shipment container
*2:without condensation
*3:Refer to Figure1-6 for Environmental Condition.
H u m id ity
(% R H )
G u ra n te e d R a n g e
(5 0
F )
(8 0
F ) (9 5
T e m p e ra tu re
F ) ( F )
Figure 1-6. Environmental Condition
Product Description
General Description
9
EPSON Stylus Photo 750
Revision A
1.2.7 Ink Cartridge
1.2.7.2 Color Ink Cartridge
1.2.7.1 Black Ink Cartridge
† Type:
Exclusive cartridge
† Color:
Black
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:
19.8mm(W) x 52.7 mm (D)x 38.5mm(H)
Exclusive cartridge
† Color:
Magenta, Cyan, Yellow, Light Magenta, Light Cyan
† Print capacity: 220 pages/A4 (360 dpi, 5% duty each color)
† Print capacity: 540 pages/A4 (ISO/IEC1056 1 Letter Pattern at 360
dpi)
† Ink life:
† Type:
† 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:
51.4mm(W) x 52.7 mm (D)x 38.5mm(H)
NOTE: Ink cartridge can not be re-filled, only ink cartridge is
prepared for article of consumption.Do not use the ink
cartridge which was passed away the ink life.
Ink will be frozen under - 4°C environment. However, it will
be usable again being placed at room temperature for 3
hours.
Figure 1-7. Black Ink Cartridge
C y a n (C )
L ig h t C y a n ( L C )
Y e llo w ( Y )
L ig h t M a g e n ta ( L M )
M a g e n ta (M )
Figure 1-8. Color Ink Cartridge
Product Description
General Description
10
EPSON Stylus Photo 750
Revision A
„ Insulation Resistance:10 M ohms min. (between AC line and
chassis, DC 500V)
1.2.8 Input Data Buffer
† Buffer: 256 Kbytes
„ Dielectric:
1.2.9 Electric Specification
† 120V version
AC 1500 V rms. 1 minute (between AC
line and chassis)
1.2.10 Reliability
„ Rated voltage:
AC 120V
† Total print volume:
10,000 pages(A4, Letter)
„ Input voltage range:
AC 99 -132V
† Print Head Life:
2000 million dots/nozzle
„ Rated frequency range:50 - 60Hz
„ Input frequency range:49.5-60.5 Hz
1.2.11 Safety Approvals
„ Rated current:
† 120V version
0.4A(Max.0.5A)
„ Power consumption: Approx.18W(ISO/IEC 10561 Letter
pattern) Energy Star compliant
„ Safety standard:
UL1950 with D3
CSA22.2 No.950 with D3
„ Insulation Resistance:10 M ohms min. (between AC line and
chassis, DC 500V)
„ EMI:
FCC part 15 subpart B classB
CSA C108.8 class B
„ Dielectric:
AC 1000 V rms. 1 minute or
AC 1200 V rms 1 second(between AC
line and chassis)
† 220-240V version
„ Safety standard:
† 220-240V version
„ Rated voltage:
„ Input voltage range:
AC220-240V
EN60950(VDE, NEMKO)
EN55022(CISPR Pub.22) class B
AS/NZS 3548 class B
1.2.12 Acoustic noise
AC 198 -264V
† Level:
Approx. 47 dB(A) (According to ISO 7779)
„ Rated frequency range: 50 - 60Hz
„ Input frequency range:49.5-60.5 Hz
„ Rated current:
0.2A(Max.0.3A)
„ Power consumption: Approx.18W(ISO/IEC 10561 Letter
pattern) Energy Star compliat
Product Description
General Description
11
EPSON Stylus Photo 750
Revision A
1.2.13 CE Marking
< Graphic Mode >
† 220-240 V version
† General operation:
„ Low Voltage Directive 73/23/EEC:EN60950
„ Initialize Printer:
„ EMC Directive 89/336/EEC:
„ Unidentical Printing: ESC U
EN55022 Class B
EN61000-3-2
EN61000-3-3
EN50082-1
IEC801-2
IEC801-3
IEC801-4
1.2.14 Printer Language and Emulation
† Printer Language:
ESC/P Raster
EPSON Remote
1.2.14.1 ESC/P Control Codes
< Character mode >
† General operation:
„ Initialize printer:
ESC@
† Paper feeding:
„ Form Feed
FF
„ Line Feed
LF
„ Carriage Return
CR
ESC @
„ Print a Image:
ESC ACK
„ CSF Mode Control:
ESC EM
† Paper Feeding:
„ Form Feed:
FF
„ Line Feed:
LF
„ Line Spacing:
ESC+
„ Carriage Return:
CR
† Page format
„ Page Length:
ESC (C
„ Top/Bottom Margin:
ESC (c
„ Paper Size:
ESC (S
† Print position motion
„ Horizontal Print Position: ESC $, ESC\, ESC($, ESC(\
„ Vertical Print Position:ESC(V, ESC(v
† Spacing:
„ Graphics Mode:
ESC (G
† Graphics:
„ Raster Graphics:
ESC.
„ Microweave control: ESC (i
Product Description
General Description
12
EPSON Stylus Photo 750
„ Dot size control:
ESC (e
„ Raster header:
ESC (D
„ Raster body:
ESC i
Revision A
† Color:
„ Printing Color:
ESC r, ESC (r
† EEPROM control:
„ EEPROM control: ESC |
Product Description
General Description
13
EPSON Stylus Photo 750
Revision A
1.3 Parallel Interface
This printer has IEEE-1284 parallel interface, RS-423 serial interface
and USB interface as standard.
1.3.1 Parallel Interface(Forward channel)
Forward channel is the mode to transfer the ordinary printing order to
the printer side from the PC side.
Table 1-6. Parallel I/F
Item
Transmission mode
Synchronization
Specification
8bit parallel, IEEE-1284 compatibility mode
By BUSY and ACKNLG signal
Signal Level
TTL compatible level
Table 1-7. Connector pin assignment and signals
Pin.
No
Signal
Name
Return
GND pin
In/Out
Function Description
1
-STROBE
19
In
The strobe pulse. Read-in of data is
performed at the falling edge of this
pulse.
2-9
Data0-7
20-27
In
The DATA 0 through DATA7 signals
represent data bits 0-7,
respectively.Eacj signal is at high when
data is logical 1 and low level when data
is logical 0.
10
-ACKNLG
28
Out
This signal is a negative pulse including
that the printer can gain accept data.
11
BUSY
29
Out
A high signal indicates that the printer
cannot receive data.
12
PE
28
Out
A high signal indicates paper-out error.
13
SLCT
28
Out
Always at high level when the printer is
powered on.
14
-AFXT
30
In
Not used.
57-30360(amphenol) or equivalent
BUSY signal is set high before setting either-ERROR low or PE high
and is held high until all these signals return to their inactive state.
BUSY signal is set high level in the following cases.
-During data entry (see Data transmission timing)
-When input data buffer is full
-During -INIT signal is at low level or during hardware initialization
-During printer error (See-ERROR signal)
-When the parallel interface is not selected.
Product Description
PE signal is at high level during paper-out error.
By STROBE pulse
Handshaking
Adaptable connector
ERROR signal is at low level when the printer is in one of the following
states.
-Printer hardware error (fatal error)
-Paper-out error
-Paper jam error
-Ink-out error
31
-INIT
30
In
This falling edge of a negative pulse or a
low signal on this line causes the printer
to initialize Minimum 50 us pulse is
necessary.
32
-ERROR
29
Out
A low signal indicates printer error
condition.
36
-SLIN
30
In
Not used.
Parallel Interface
14
EPSON Stylus Photo 750
Revision A
1.3.2 Parallel Interface(Reverse channel)
Pin.
No
Signal
Name
Return
GND pin
In/Out
Function Description
18
Logic H
---
Out
Pulled up to +5V via 3.9K ohm resistor.
35
+5V
---
Out
Pulled up to +5V via 3.3 K ohm resistor.
17
Chassis
GND
---
---
Chassis GND.
16,33
19-30
GND
---
---
Signal GND.
15,34
NC
---
---
Not connected.
Reverse channel is used to transfer the information data from the printer
side to the PC side.
Table 1-8. Connector pin assignment and signals
Item
Transmission mode
NOTE: In/Out refers to the direction of signal flow from the printer’s
point of view.
Specification
IEEE-1284 nibble mode
Synchronization
Refer to the IEEE-1284 specification
Handshaking
Refer to the IEEE-1284 specification
Data trans.timing
Refer to the IEEE-1284 specification
Signal Level
Adaptable connector
TTL compatible level
57-30360(amphenol) or equivalent
† Extensibility request: The printer responds affirmatively when the
extensibility request values are 00H or 04H, that mean,
00H: Request Nibble Mode Reverse Channel Transfer.
04H: Request Device ID;
Return Data Using Nibble Mode Rev Channel Transfer
† Device ID: The printer sends following device ID string when it is
requested.
„ When IEEE1284.4 protocol is effective:
[00H] [57H]
MFG:EPSON;
CMD:ESCPL2,BDC,D4;
MDL:Stylus[SP]Photo[SP]750;
CLS:PRINTER;
DES:EPSON[SP]Stylus[SP]Photo[SP]750;
Product Description
Parallel Interface
15
EPSON Stylus Photo 750
„ When IEEE1284.4 protocol is NOT effective:
[00H] [57H]
MFG:EPSON;
CMD:ESCPL2,BDC;
MDL:Stylus[SP]Photo[SP]750;
CLS:PRINTER;
DES:EPSON[SP]Stylus[SP]Photo[SP]750;
NOTE: [00H] denotes a hexadecimal value of zero.
[SP] denotes a space character(20H).
MDL and DES values depend on the EEPROM setting.
Product Description
Revision A
Table 1-9. Connect pin assignment and signals
Pin.
No
Signal
Name
Return
GND pin
In/Out
Function Description
1
HostClk
19
In
Host clock signal.
2-9
Data0-7
20-27
In
The DATA 0 through DATA7 signals
represent data bits 0-7,
respectively.Eacj signal is at high level
when data is logical 1 and low level
when data is logical 0. These signals are
used to transfer the 1284 extensibility
request values to the printer.
10
PtrClk
28
Out
Printer clock signal.
11
PtrBusy/
DataBit-3,7
29
Out
Printer busy signal and reverse channel
transfer data bit3 or 7.
12
AckDataReq/
DataBit-2,6
28
Out
Acknowledge data request signal and
reverse channel transfer data bit2 or 6.
13
Xflag/
DataBit-0,4
28
Out
X-flag signal and reverse channel
transfer data bit 1 or 5.
14
HostBusy
30
In
Host busy signal.
31
-INIT
30
In
Not used.
32
-DataAvail/
DataBit-0,4
29
Out
Data available signal and reverse
channel transfer data bit 0 or 4.
36
1284-Active
30
In
1284 active signal.
18
Logic H
---
Out
Pulled up to +5V via 3.9K ohm resistor.
35
+5V
---
Out
Pulled up to +5V via 3.3 K ohm resistor.
17
Chassis
GND
--
--
Chassis GND.
16,33
19-30
GND
---
---
Signal GND.
15,34
NC
---
---
Not connected.
Parallel Interface
16
EPSON Stylus Photo 750
Revision A
NOTE: Following lists “Notes” when using the parallel interface.
1. “Return GND pin” in the table means twist pair return and is
connected to the signal GND level.
Also, these cables are shielded wires and it is effective means to
connect to each chassis GND in the PC and printer for electrostatic
noise.
Product Description
Parallel Interface
17
EPSON Stylus Photo 750
Revision A
1.3.3 Serial Interface
Following figure shows port arrangement of serial I/F connector.
This section shows specification for serial interface I/F.
Table 1-11. Serial interface
Item
Specification
Standard
Based on RS-423
Synchronization
Synchronous
Bit rate
Approx. 1.8Mbps
Word format
•
•
•
•
Handshaking
X-ON/X-OFF, DTR protocol
Adaptable connector
8-pin mini circular connector
Recommended interface cable
Start bit 1bit
Data bit 8bit
Parity bit none
stop bit 1bit
Figure 1-10. Serial I/F Connector Port
Apple System Peripheral-8 cable
Table 1-12. Connector pin assignment and signals
Pin
No.
Signal
Name
In/Out
Function Description
1
SCLK
Out
Synchronous clock
2
CTS
In
Clear to send
3
TxD-
Out
Transmitt data-
4
S.G.
In
Signal ground
5
RxD-
In
Receive data-
6
TxD+
Out
Balanced Transmit+
7
DTR
Out
Data terminal ready
8
RxD+
In
Balanced Receive+
Following table shows timing relation of DTR, X-ON/X-OFF
handshaking.
Table 1-13. X-ON/X-OFF, DTR protocol
State
Buffer space
X-on/X-off
DTR
Busy
Less than 3072
bytes
Send X-OFF code
Off
Ready
More than 5120
bytes
Send X-ON code
On
NOTE: In/Out refers to the direction of signal flow from the printer’s
point of view.
Product Description
Parallel Interface
18
EPSON Stylus Photo 750
Revision A
1.3.4 USB(Universal Serial Bus) Interface
Following shows specification.
† Standard: Based on
P in 1
P in 2
„ Universal Serial Bus Specifications Revision 1.0
„ Universal Serial Bus Device Class Definition for Printing Devices
version 1.0
† Bit rate:
12Mbyte(Full Speed Device)
† Data encording:
NRZI
† Adaptable connector:
USB Series B
P in 3
† Recommended cable length: 2 meters
Table 1-14. Connector pin assignment and signals
Figure 1-11. USB Interface Port
Pin.
No
Signal Name
I/Out
Function Description
1
VCC
--
Cable power. Maximum power
consumption is 100mA.
2
-Data
Bidirectional
Data
3
+Data
Bidirectional
Data. Pull up to +3.3V via 1.5K ohm
resistor.
4
Ground
--
Cable ground.
Product Description
P in 4
Parallel Interface
19
EPSON Stylus Photo 750
Revision A
1.3.5 Prevention of data transfer time-out on the
host
Generally, hosts abandon data transfer to peripherals when a peripheral
is in busy state for dozens of seconds continuously. To prevent hosts
from acting this kind of time-out, the printer receives data very slowly,
several bytes per minute, even if the printer is in busy state. This
slowdown starts when the remaining input buffer is less than several
hundreds of bytes. Finally, the printer is in busy state continuously when
the input buffer is full.
1.3.6 Interface selection
The printer has 3 built-in interfaces; Parallel I/F, Mac serial I/F and USB
I/F. These interfaces are selected automatically.
„ Automatic selection
In this automatic interface selection mode, the printer is
initialized to the idle state scanning which interface receives
data when it is powered on. Then the interface that receives
data first is selected. When the host stops data transfer and the
printer is in the stand-by state for the seconds, the printer is
returned to the idle state. As long as the host sends data or the
printer interface is busy state, the selected interface is let as it is.
„ Interface state and interface selection
When the parallel interface is not selected, the interface got into
the busy state. When the serial interface is not selected, the
interface sets the DTR signal MARK. When the printer is
initialized or returned to the idle state, the parallel interface got
into the ready state, the serial interface sets the DTR signal
SPACE. Caution that the interrupt signal such as the -INIT
signal on the parallel interface is not effective while that interface
is not selected.
Product Description
1.3.7 IEEE 1284.4 protocol
The packet protocol described by IEEE1284. 4 is supported on the
parallel I/F and USB I/F. Three function modes of IEEE1284.4 protocol,
“On”, “Off” and “Auto” are available for each I/F, and one of them is
selected according to the value in EEPROM address 0Ah and 0Ch.
On: Communication in IEEE1284.4 packet mode is started by
receiving a magic string(1284.4 synchronous commands).
Until a magic string is received, other commdands are
discarded.
Off: Communication is carried out in the conventional mode. A
magnetic string(1284.4 synchronous commands) is discarded.
Auto: Communication is carried out in the conventional mode until a
magic string(1284.4 synchronous commands) is received. By
receiving a magic string, communication in IEEE1284.4 packet
mode is started.
NOTE: The packet protocol of IEEE1284.4 allows a device to carry
on multiple exchanges or conversations which contain data
and /or control information with another device at the same
time across a single point to point link. The protocol is not,
however, a device control language. It does provide basic
transport-level flow control and multiplexing services. The
multiplexed logical channels are independent of each other
and blocking of one has no effect on the others. The protocol
operate over IEEE1284.
Parallel Interface
20
EPSON Stylus Photo 750
Revision A
1.4 Function
1.4.3.1 Switches
1.4.1 Control Code
Since this printer does not have so many switches, each button has
several functions. The tables below show their functions and how to
enter those functions for each switch.
This printer is operated with the raster graphics control code based on
the ESC/P2 control line. Refer to “ESC/PV2 Reference Manual” and
“ESC/P2 specification” for each command and ESC sequence.
Table 1-15. Panel functions in normal state
Switch
Load/Eject
(Less than 2
seconds)
1.4.2 Bi-directional Command
† Remote Setting Command
Refer to “Remote Command Specification” for details.
1.4.3 Control Panel
There are 2 non-lock type push switches, 1 lock type push switch and 4
LEDs. The figure below shows the exterior view of the control panel.
Function
• Load or eject paper
• When the carriage is on the position for exchanging ink
cartridge, return it to the home position.
Load/Eject
(for 2 seconds)
• Start the ink cartridge exchange sequence; i.e. move the
carriage to carriage exchange position.
Cleaning
(for 2 seconds)
• Start cleaning the print head.
• In the condition of “Ink Low” or “No Ink Cartridge”, start
the ink cartridge exchange sequence.
Cleaning
(Less than 2
seconds)
• When the carriage is on the position for exchanging ink
cartridge, return it to the home position.
P o w e r L E D :G re e n
Table 1-16. Panel function with turning on
P a p e r o u t L E D :R e d
Switch to press when
turning on
In k O u t ( B la c k ) L E D :R e d
Load/Eject
Cleaning
Load/Eject +
Cleaning
P o w e r S W
In k O u t ( C o lo r ) L E D : R e d
Function
• Start status-printing.*1
• Change code pages/Select IEEE1284.4 mode for
parallel I/F*2.
• Start special setting mode.*3
L o a d /E je c t S W
C le a n in g S W
Figure 1-12. Control Panel
Product Description
NOTE: *1: Refer to Table 1-17, “Status printing,” on page 22.
*2:Not described in the User’s manual. (not open to the
users)
*3:See the Table in the section “Special Setting Mode”.
Function
21
EPSON Stylus Photo 750
Revision A
NOTE: *Waste ink counter value and Timer IC counter value are
initialized.
*1(from the previous page): According to the content of 35H of
EEPROM, one of the following actions is carried out.
Table 1-17. Status printing
Content of 35H of EEPROM,
[bit7] [bit6]
1.4.5 LED Indications
Action
There are 4 LEDs in this printer.
• Print firmware version, ink counter, selected
code page and nozzle check pattern
00
1. Power
Lights when the operate switch is “ON”, and AC power is supplied.
11
01
• Start hex-dump printing.
10
• Start self test printing.
2. Paper Out
Lights during the paper-out condition, and blinks during the paperjam condition.
1.4.4 Special Setting Mode
C A U T IO N
„ Unlike the previous models, since this printer does
not have EEPROM All Clear function, do not perform
this operation except for the purpose of canceling the
maintenance errors.
„ Be sure to replace the waste ink pad located in the
lower case, when canceling the maintenance error.
„ If you replace the waste ink pad regardless of the
maintenance error, be sure to perform this operation.
After turning the power on while pressing Load/Eject and “Cleaning”
switches, “Paper Out” indicator blinks for 3 seconds. By pressing the
following switches during this period, following action is carried out.
3. Ink Out(Black)
Lights during no Black ink condition, and blinks during the Black ink
low condition.
4. Ink Out (Color)
Lights during no Color ink condition, and blinks during the Color ink
low condition.
See the table on the next page for more detailed LED indications. Since
LED indicates the various errors and current printer operations, LED
indications enable to find out the proper repair operation.
Table 1-18. Special setting mode
Switch
Load/Eject
Cleaning
(for 10 seconds)
Product Description
Function
• Initialize EEPROM* and reset time IC.
• Reset the ink overflow counter in EEPROM.
Function
22
EPSON Stylus Photo 750
Revision A
1.4.6 Errors
Table 1-19. Printer Status displayed on the control panel
Indicators
Printer Status
Power
Ink Out
(Black)
Ink Out
(Color)
Paper Out
Priority
Power on condition
On
--
--
--
9
Ink sequence
Blink
--
--
--
6
Ink cartridge
exchange mode
Blink
--
--
--
5
Data processing
Blink
--
--
--
8
Paper out*1
--
--
--
On
4
Paper jam*1
--
Off
Off
Blink
3
No ink cartridge or
Ink out (black)
--
On
--
--
7
Ink level low (black)
--
Blink
--
--
7
No ink cartridge or
Ink out (color)
--
--
On
--
7
Ink level low (color)
--
--
Blink
--
7
EEPROM and
Timer IC reset*2
--
On
(for 1
second)
On
(for 1
second)
On
(for 1
second)
--
Maintenance
Request
Blink
Blink
Blink
Blink
2
Fatal Error*1
Blink
On
On
Blink
1
NOTE: *1 Refer to “Fatal Error” under the “Errors” on page -23.
*2 EEPROM reset does not mean to erase all address in
EEPROM. (See “Special Setting Mode” on page -22)
*3 -- in the table above means no change.
Product Description
In this printer, when the following conditions are detected. the printer
goes to the error condition, sets ERROR signal Low and BUSY signal
High and stops receiving the data. The printer becomes unable to print
at this time. However, if the printer communicated by IEEE1284.4
protocol, the printer does not become unprintable state.
† Ink Out
When the printer runs out most of the ink of any one color, it
indicates ink-low warning and keeps printing. When the print runs
out the whole ink of any one color, it indicates ink-error and stops
printing. Exchanging ink cartridges is required on this state. An ink
cartridge taken out once should not be used again. Re-installation of
the cartridge upsets the ink level detection and may cause a serious
problem to the print head as a result.
C A U T IO N
Never use or re-install the cartridge, which is taken
out once. Re-installation of the used cartridge
disturbs the normal ink out detection.
† Paper out
When the printer fails to load a sheet, it becomes “paper out error”
condition.
† Paper Jam
When the printer fails to eject a sheet, it becomes “paper jam error”
condition.
Function
23
EPSON Stylus Photo 750
Revision A
† No Ink Cartridge
When the printer detects that ink-cartridge comes off, it becomes
“No ink cartridge error” condition.
C A U T IO N
1.4.7 Initialization
There are 3 types of initialization.
„ When you need to perform test print after the repair
service, performing the status-printing(see “Control
Panel” on page -21) provides the discharged ink
condition from the all ink nozzles and the current
value of the waste ink counter. Be sure to check
that the counter value still has enough capacity.(if
the value is closer to 2700 or not)
„ If there is no enough capacity, exchange the waste
ink absorber and find out if it is necessary to reset
EEPROM or not. If you need to reset EEPROM, refer
to “Special Setting Mode” on page -22.
† Maintenance request
When the total quantity of ink wasted with cleaning and flushing
reaches the limit, the printer indicates this error and stops printing.
The absorber in the printer enclosure should be replaced with a new
one by a service person. The counter is added by points and its limit
is as follows.
† Power-on Initialization
This printer initializes itself when it is turned on, or when it
recognizes the cold-reset command (remote RS command).
On this initialization, following actions are performed.
„ Initialize mechanical components
„ Clear the input buffer
„ Clear the print buffer
„ Set default values
† Operator initialization
This printer initializes itself when it is turned off and is turned on
again within 10 seconds, or when it recognizes the -INIT
signal(negative pulse) on parallel interface. On this initialization,
following actions are performed.
„ Cap the print head
„ Eject paper
„ Clear the input buffer
„ 37000 point = Approx. 418ml
† Fatal Errors
When the printer detects a problem with controlling the mechanical
components or assessing the CG, it becomes “fatal error” condition.
„ Control Error
Defective parallel adjustment, defective HP detection, scarcity of
lubrication on the carriage shaft etc.
„ Clear the print buffer
„ Set default values
† Software initialization
“ESC@” command also initializes the printer. On this initialization,
following actions are performed.
„ Logic operation error
Shorted circuit, etc.
Product Description
„ Clear the print buffer
„ Set default values
Function
24
EPSON Stylus Photo 750
Revision A
1.4.8 Initialization Setting
1.4.9 Physical Specification
This printer initializes following settings as initialization setting when the
initialization is performed. Also, among the items of panel setting,
default setting and remote command settings, the items which can be
stored are also initialized as initialization setting.
† Weight:
5.2Kg
† Dimensions: 429 mm(W) x 260.9 mm(D) x 167.1 mm (H) (without
sheet support)
† Page position: Page heading location as present paper location
2 9 1 .9 7
† Line spacing: 1/6 inch
1 6 7 .1
† Right margin position: 80 lines
† Left margin position: first line
6 0 8 .7 4
† Printing mode:Text mode (Not raster graphics mode)
2 6 0 .9
† Character pitch: 10 CPI
4 2 9
Figure 1-13. Dimension of Stylus Photo 750
Product Description
Function
25
EPSON Stylus Photo 750
Revision A
1.4.10 Consumables and options
The consumables and options for this printe are following;
Table 1-20. Consumables
Classification
No.
Name
IC1BK02
Ink Cartridge(black)
IC5CL02
Ink Cartridge(color)
Consumables
Product Description
Function
26
&+$37(5
5
OPERATING PRINCIPLES
EPSON Stylus Photo 750
Revision A
† Print Head
Each color 120 DPI, 48 nozzle x 6 colors(Black, Cyan, Light Cyan,
Magenta, Light Magenta, Yellow). Head is mounted at the carriage
mechanism.
2.1 Overview
This section describes operating principles of the printer mechanism
and electric circuit boards (C259Main, C257PSB and C209PNL).
2.1.1 Printer Mechanism
This printer is composed of Print Head, Carriage Mechanism, Hopper
Drive Mechanism, Paper Feed Mechanism, Pump Mechanism and
Carriage Lock Mechanism.
† Carriage Mechanism
This mechanism consists of Carriage Motor(CR Motor), Carriage,
Timing Belt, CR Guide Shaft, CR Guide Frame and Carriage Home
Sensor (HP Sensor).
„ Carriage
Print Head is mounted.
„ CR Motor
This motor moves the carriage to the appointed position on the
platen for the printing operation by using the timing belt.
P F M o to r
C a r r ia g e M e c h a n is m
( P r in t H e a d )
C R
T im in g B e lt
P a p e r L o a d
T r ig g e r
P u m p
† Paper Feed Mechanism
This mechanism consists of Paper Feed Motor(PF Motor), PF
Roller, Paper Feed Roller Line and Paper Guides.
P a p e r F e e d
M e c h a n is m
C a r r ia g e L o c k
M e c h a n is m
o p 1
H o p p e r D r iv e
M e c h a n is m
P u m p M e c h a n is m
Figure 2-1. Printer Mechanism
Operating Principles
„ CR Guide Shaft
Since this guide shaft is ecentric shaft, it is rotated by the adjust
lever and sets the platen gap “0“ or “+”. This prevents the print
head and print surface from contacting and rubbing.
M o to r
† Hopper Drive Mechanism
This mechanism is installed at the rear side of the printer and
consists of Paper Pick Up Roller, One-way Clutch and Hopper.
Operation is performed by the PF motor, when the carriage is
around the left edge. Paper is set to the hopper. One-way clutch
rotates the Pick Up roller for paper loading by using the driving
power of the PF motor.
Overview
28
EPSON Stylus Photo 750
Revision A
† Pump Mechanism
This mechanism consists of Pump and Cap parts.
„ Cap Parts
This protects the surface of print head nozzle from being dry or
from being attached with dust.
„ Pump Parts
This part receives motive power from the PF motor and
absorbes bubbles and viscous ink on the print head nozzle by
using the motor rotation and drains them to the waste ink pad.
† Carriage Lock Mechanism
This prevents the print head from separating from the cap parts by
the shocks from outside. Using the motive power from the PF motor,
this mechanism controls the lock lever, which secures the carriage,
and fixes or releases the carriage.
Operating Principles
Overview
29
EPSON Stylus Photo 750
Revision A
2.2 Operating Principles of Electric Circuit
The electric circuit of this printer consists of the following circuits.
† C259 Main Control Circuit
2.2.1 C257 PSB Power Supply Circuit
The power supply circuit in the printer uses RCC(Ringing Choke
Converter) circuit method, and generates and outputs 2 types of
voltages which are necessary for the printer operation.
† C257 PSB Power Supply Circuit
Table 2-1. Output Voltage
† C209 PNL Panel Board
Voltage
Also, the head drive circuit is mounted on the print head. In this section,
the operating principles of C257PSB board and C259 Main board. The
figure below shows the block diagram of the electric circuit.
Usage
+42VDC
• Motors
• Print Head common voltage
+5VDC
• C259Main Control Circuit Logic
• C209 PNL Panel Board
• Sensors
In this printer, even if the power switch is turned off in the middle of the
printing operation, application of the secondary switch enables the
printer to supply the voltage to the power/logic lines at the main board
side for at least 30 seconds. Therefore, even if the switch is turned off in
the middle of the printing operation, the power will be turned off after the
capping operation is completed. This prevents the print head from being
left uncapped and dry, and also ink leaking.
Figure 2-2. Electric Circuit Block Diagram
Operating Principles
AC voltage input from the AC inlet passes through the Filter Circuit at
first, which removes the high frequency component, then, goes to Full
Wave Rectifier Circuit and Smoothing Circuit and is converted to DC
power supply. Then, this direct voltage is led to the Switching Circuit
and is performed with switching operation by FET Q1. By the switching
operation in the primary side circuit, +42 VDC is generated and
stabilized in the secondary side. The +42VDC generated at the
secondary side is converted to more stabilized +5VDC by the chopping
regulator IC located at the secondary side.
Operating Principles of Electric Circuit
30
EPSON Stylus Photo 750
+42 VDC
Revision A
+5 VDC
† +42V Line Constant Voltage Control Circuit:
The output level of the +42V line is monitored by a detection circuit
consisting of seven Zener diodes.This circuit prevents from
dropping for constant output voltage.
PSC Signal
from Main board
ZD53
† +5V Line Over Voltage Protection Circuit:
This protection circuit is in the same line as +42V over voltage
protection circuit is located. The output voltage level of the +5V line
is monitored by a Zener diode. This circuit shuts down the circuit
operation forcefully when the voltage level exceeds +9V.
+5VDC Line
Over Voltage
Limitation
IC51
+5V Regulator
ZD52,87
+42VDC Line
Over Voltage
Limitation
ZD90
† +42VDC Line Drop Limitation Circuit:
This protection circuit is in the same line as +42V over voltage
protection circuit is located. The output voltage level of the +42V line
is monitored by a Zener diode. This circuit shuts down the circuit
operation forcefully when the voltage levels drops +36V.
+42VDC Lin Drop
Limitation Circuit
ZD81-86,ZD51
+42VDC Line
Constant Control
C84,Q84
Power Drop
Delay Circuit
C51
Smoothing
Circuit
† +42VDC Line Over Voltage Circuit:
This circuit is in the same line as +5V line over voltage protection
circuit is installed. The output level is monitored by two Zener
diodes. If the voltage level exceeds +48VDC, this circuit stops circuit
operation forcefully.
PC1
Photo
Coupler
D51
TRANS(T1)
C11
Smoothing
Circuit
Over Current
Protection
F1
Abnormal
Feed back circuit
Main Switching
Circuit
Filter Circiut
L1,R1-2
C1-C4
† +5V Line Constant Voltage/Constant Current Control Circuit:
The output current is monitored by a +5VDC generation switching
control IC(IC51), which also monitors the output voltage. This
information is input to the internal comparator and stabilizes +5V
line.
Q2,Q3,Q31
Q1
Full Wave
Rectifier circuit
DB1
AC Input
op03
Figure 2-3. Power Supply Circuit Block Diagram
Operating Principles
Operating Principles of Electric Circuit
31
EPSON Stylus Photo 750
Revision A
2.2.2 C259 Main Control Circuit
2.2.2.1 Major Elements
Printer mechanism is controlled by C259 main board. The figure below
shows the block diagram of C259 main control circuit.
Major elements used in C259 main control circuit board are below.
Table 2-2. Major Elements
IC
CPU
C90A05CA
CN3 USB
Cartridge Sensor
P-ROM
(IC3)
CN9 HD FFC
Head
16bit CPU mounted on the control circuit board
is driven by 24MHz clock frequency, and
controls the whole printer.
CR Motor
PF Motor
Timer
Counter
(IC8)
Common
Driver
(IC14)
Reset IC
(IC9)
Motor
Driver
(IC11)
PROM
IC3
Volume 4/8/16MB, Bus width 16 bit EEPROM
• Program or program +CG(k character
generator)
RAM
IC4
Bus width 16 bit, 4Mbit DRAM
Mask ROM
IC6
64Mbit Mask ROM
• CG
AT93C46
IC7
1kBit EEPROM
• Default Setting Value
• Back-up of various parameter
RTC-9810SA
IC8
Reset/Timer IC
74VHC161284
MEA
IC9
Transceiver IC
SN75LBC777
IC10
RS-422/423 Transceiver
LB1847
IC11
CR motor drive iC
Motor
Driver
(IC12)
E05B588
(IC2)
Motor
Driver
(IC13)
Address
CN11
Motor control
Head voltage control
EEPROM control
Monitoring the sensor
Monitoring Timer IC
Mac,Serial I/F, running direction parallel I/F,
USB I/F control
IC2
CN8
EEPROM
(IC7)
•
•
•
•
•
•
Gate Array
E05B58**
CN7
Buffer
(IC9)
C90A05
(IC1)
IC1
Q2&Q3
CN1 Parallel
M-ROM
(IC6)
Function
CR1
Batt1
D-RAM
(IC4)
Location
Data
C209 PNL
CN6
CN4
Transceiver
(IC9)
CN2 Mac. Serial
ASF Sensor
CN5
PE Sensor
HP Sensor
op04
Figure 2-4. Control Circuit Block Diagram
Operating Principles
A3956ALB
IC12,13
CXA2099S
IC14
Operating Principles of Electric Circuit
PF/PUMP Motor drive IC
Head drive control HIC
• Generating head common voltage
32
EPSON Stylus Photo 750
Revision A
2.2.2.2 Reset Circuit
Reset circuit consists of reset/timer IC(IC8) and peripheral elements.
The reset/timer IC prevents the CPU from running away, which is
caused by the unstable voltage(+5VDC line voltage is less than +4.3V)
in the logic line during the power ON/OFF operation. Also, IC sends the
reset signal to the CPU and gate array when +42VDC line voltage is
less than +35.5V.
IC 1
C90A05
/RES
IC 8
RTC-9810
+42
VIN
VDD
B1
/VDT
FRST
/RST
VBK
CE
GND
SCLK
10
29
3
24
2
25
/NMI
MRES
/RESET
IC 2
E05B588
DATA
Figure 2-5. Reset Circuit
Operating Principles
Operating Principles of Electric Circuit
33
EPSON Stylus Photo 750
Revision A
2.2.2.3 Sensor Circuit
The following sensor circuits are mounted on the C259 Main Control
Circuit.
† HP Sensor
HP sensor uses the photo interrupter method. A HP sensor detects
the carriage home position. It is used for managing printing position
and cleaning, etc.
† PE Sensor
PE sensor uses the photo interrupter method. A PE sensor
determines if there is a paper in the printer. Based on the signal
from this sensor, a particular page edge treatment such as Microweave printing is performed.
† ASF Sensor
ASF sensor uses the photo interrupter method. An ASF sensor
detects the position of return lever when the power is turned on, and
causes the paper to be picked up by the pick up roller fro the normal
initial position.
† Thermistor Sensor (TH)
This sensor is mounted on the print head board and measures the
temperature around the head. It keeps stable printing quality,
changing PZT drive voltage(VH) slightly according to changes of
environmental temperature.
† Black/Color Cartridge Sensor(COB/COC)
Cartridge sensor uses the mechanical method. The sensor detects
if the cartridge is installed or not.
+5V
IC 2
E05B58**
ASFV
+5V
SWA0
97
HPV
+5V
98
HP
CN5
HP
PEV
+5V
SWA2
GND
+5V
+5V
99
CN4
ASF
ASF
+5V
SWA1
GND
+5V
+5V
GND
PE
SWC0
COB
SWC1
coc
CN6
PE
GND
CN9
CPU
THM
AN0
op06
Figure 2-6. Sensor Circuit
Operating Principles
Operating Principles of Electric Circuit
34
EPSON Stylus Photo 750
Revision A
2.2.2.4 Timer Circuit
2.2.2.6 Head Drive Circuit
The timer of this printer uses reset/timer IC(IC8). The timer keeps
record of how long the printer is OFF and uses it information to judge it
the initial cleaning should be performed or not when the power it turned
ON next time. The data in the IC is backed up by the lithium battery.
Head drive circuit of this printer consists of the following circuits.
† Driven voltage wave form circuit
This circuit consists of HIC(IC14) and terminal transistor, and
generates drive wave which will be charged to each PZT.
2.2.2.5 EEPROM Control Circuit
This printer uses non-volatile memory EEPROM(IC7). When turning the
power ON, EEPROM outputs data to the gate array(IC2) and records
the data when turning the power OFF. The data which EEPROM will
record are followings;
+42
F1
22
VCC45
Vcc45_2
A0
NPNB
A1
FB
A2
PNPB
A3
CLK1
CLK2
/FLOOR VCC5
/RST
DATA
DCLK
/E
VOUTGND
„ Ink Consumption Counter (black/color)
„ Frequency of Cleaning
„ Destination Data
VHCTL
SWC0
HWA0
SWC1
HWA1
HLAT
HWA2
HWA3
HNCHG
HWCLK1
HWCLK2
HCLK
/HWFLR
IECLK
/HWRST
HWSDATA HSI1
HWSCLK
HSI2
/HWSLAT
HSI3
+5V
Vcc
ORG
GND
CS
SK
DI
HSI4
E05B58**
(IC2)
AT93C46
(IC7)
5
23
20
18
26
25
24
16
23
+5
24
22
21
14
20
E05B58**(IC2)
„ Other various setting values
6
27
19
„ CPSI Pass Word
8
CN9
CXA20996(IC14)
1
206
2
205
3
204
DO 4
203
HSI5
HSI6
190
1
189
2
184
5
173
16
174
14
175
176
12
177
11
178
10
179
9
180
8
181
7
3
EECS
VHV
COM
COM
COM
COM
GND2
GND2
GND2
GND2
BCO
CCO
LAT
NCHG
CLK
SI1
SI2
SI3
SI4
SI5
SI6
THM
+5
TMP95C061(IC1)
EECK
AN0
105
18
17
15
EECO
13
6
4
EECI
GND
GND
GND
GND
GND
GND
op08
op07
Figure 2-8. Common Drive Circuit
Figure 2-7. EEPROM Control Circuit
Operating Principles
Operating Principles of Electric Circuit
35
EPSON Stylus Photo 750
Revision A
† Driver on the head
The driver on the head is Nozzle-selector drive circuit. Each drive
waveform generated in the drive voltage wave form circuit is
charged to the selected nozzle by this circuit with PZT elements,
then, printing is performed.
2.2.2.7 Paper Feed (Pump) Motor (PF/Pump Motor) Drive
Circuit
IC12 and IC13 on the control circuit board drive PF/PUMP motor. This
motor uses 4-phase 200-pole Hybrid type stepping motor and drives
constant current bi-pola.
8
PFIA0
A3956(IC12)
9
PFIA1
14
10
PFIA2
PFPHAA
9
11
8
4
PFIB0
7
5
PFIB1
2
6
PFIB2
+5
PFPHAB
1
7
D0
OUTA
D1
OUTB
D2
VBB
PHASE
VCC
10
15
REF
PFD
E05B58**(IC2)
A3956(IC13)
14
9
C90A05
(IC1)
8
7
6
DA1
112
5
+
7
2
1
D0
OUTA
D1
OUTB
D2
VBB
PHASE
VCC
10
15
REF
PFD
Current
Detection
M6252(IC16)
1
CN8
A
3
/A
Rotor
2
4
B
/B
Figure 2-9. Paper Feed (Pump) Motor Drive Circuit
Operating Principles
Operating Principles of Electric Circuit
36
EPSON Stylus Photo 750
Revision A
2.2.2.8 Carriage Motor(CR Motor) Drive Circuit
CR motor is driven by IC11 mounted on the C259 main control board.
4-phase 200-pole Hybrid type stepping motor is used as a CR Motor
and is driven by bi-pola constant drive control.
LB1847(IC11)
E05B58**(IC2)
CRIA0
CRIA1
CRIA2
CRIA3
CRIB0
CRIB1
CRIB2
CRIB3
CRPHAA
CRPHAB
CRENBA
CRENBB
25 IA1
194
24 IA2
195
23 IA3
196
22 IA4
200
18 IB1
199
19 IB2
198
20 IB3
197
21 IB4
2
111
3
+
OUTA
OUTA-
7
6
191
202
27
192
PHASE1 OUTB
16
PHASE2 OUTB-
201
9
8
26
ENBL1
17
C90A05
(IC1)
DA0
193
1
2
13
Current
Detection
M6252(IC15)
1
ENBL2
Vref1
Vref2
CN7
A
3
/A
Rotor
2
4
op10
B
/B
Figure 2-10. Carriage Motor Drive Circuit
Operating Principles
Operating Principles of Electric Circuit
37
&+$37(5
6
TROUBLESHOOTING
EPSON Stylus Photo 750
Revision A
3.1 Overview
This section describes how to identify and troubleshoot the problems
when repairing the printer by dividing the troubles into two levels; repair
and replacement of the assemblies and units, and repair of the
components. Refer to the flowchart below and perform repairing the
component after separating the defective units.
S T A R T
Table 3-2. Sensor Check Point
Sensor Name
HP Sensor
PE Sensor
Check Point
U n it R e p a ir
( M a in b o a r d )
U n it R e p a ir
(P S B /P S E )
U n it R e p a ir
( P r in te r M e c h a n is m )
D is a s s e m b le a n d A d ju s tm e n t
E N D
Switch Mode
Less than 0.7V
Open (Out of HP
range)
More than 2.4V
Close (Within HP
range)
Less than 0.7V
Open (Paper
exists)
More than 2.4V
Close (No paper)
Less than 0.7V
Open (Paper Feed
Roller home
position)
More than 2.4V
Close (Out of home
position)
Analog signal
10 K (at 24 °C)
CN4/Pin 1 and 2
CN5/Pin 1 and 2
U n it L e v e l T r o u b le s h o o tin g
ASF Sensor
Signal Level
CN6/ Pin 1 and 2
Thermistor
(THM)
Head side CN9/
Pin 3 and 4
Black cartridge
sensor (COB)
Head side CN9/
Pin 1 and 4
Open (Cartridge is installed)
Color cartridge
sensor (COC)
Head side CN9/
Pin 2 and 4
Open (Cartridge is installed)
Close (No Cartridge)
Close (No Cartridge)
Figure 3-1. Troubleshooting Flowchart
Table 3-1. Motor, Coil Resistance
Motor
Location
Check Point
Resistance
CR Motor
CN7
Pin 1 and 3
Pin 2 and 4
7.8 Ohms ± 10% (at
25 °C/one phase)
PF Motor
CN8
Pin 1 and 3
Pin 2 and 4
8.8 Ohms ±10%
(at 25 °C/one phase)
Troubleshooting
Overview
39
EPSON Stylus Photo 750
Revision A
Table 3-3. Error Indication
LED Indication
Condition
Power
Paper
Check
Ink End
(Black)
Ink End
(Color)
No Paper
--
On
--
--
Paper Jam
--
Blink
Off
Off
Ink End / No
Cartridge (black)
--
--
On
Remedy
Set papers
Removed the jammed
paper
--
Close the cartridge
cover correctly or
replace the ink
cartridge with new
one.
Close the cartridge
cover correctly or
replace the ink
cartridge with new
one.
Ink End / No
Cartridge (color)
--
--
--
On
Ink Low (black)
--
--
Blink
--
Replace with a new ink
cartridge.
Ink Low (color)
--
--
--
Blink
Replace with a new ink
cartridge.
Blink
Replace the waste ink
pad and reset
EEPROM and Timer
IC. (See“Special
Setting Mode” on
page -22)
On
Turn Off and back On
the printer. If it does
not recover, repair the
related units.
Maintenance
Request
Fatal Error
Blink
Blink
Troubleshooting
Blink
Blink
Blink
On
Overview
40
EPSON Stylus Photo 750
Revision A
3.2 Unit Level Troubleshooting
1. Printer does not operate.
This section contains the flow charts which are used to isolate the faulty
unit by following the flow chart according to the problem caused during
replacing or repairing the unit. You are to identify the faulty unit based
on the primary symptom listed in the Table3-4. After this, refer to 3.4
Unit Repair and find and replace the defective parts.
S T A R T
Is A C
p o w e r v o lta g e
n o r m a l?
N O
In p u t n o rm a l
p o w e r s u p p ly .
Y E S
Table 3-4. Symptoms and Corresponding Flow Chart
Symptom
Cause
Flow Chart
Printer does not
operate.
• No LED goes ON.
• Printer mechanism does not
operate at all.
1
Error is detected.
• LED indicates error.
2
Abnormal printing
operation.
• Printing is not performed.
• Bad printing quality.
• Abnormal printing.
3
Paper Feeding is not
performed correctly.
• Abnormal paper feeding.
• Paper jam occurs.
• Page heading position is not
right.
4
No responds from the printer,
even after pressing switches.
5
Abnormal Control
Panel
Is th e
fu s e (F 1 ) o f
p o w e r s u p p ly
b o a rd
o p e n e d ?
Y E S
N O
E x c h a n g e
D is c o n n e c
th e m a in b
tu rn th e p o
a g a in .
th e fu s e .
t C N 1 0 in
o a rd a n d
w e r o n
N O
C h e c k o u tp u t v o lta g e
o f C N 2 in th e p o w e r
s u p p ly b o a r d .
Is th e
fu s e o p e n d
a g a in ?
Y E S
Is th e
o u tp u t v o lta g e
o f p o w e r s u p p ly
n o r m a l?
N O
Y E S
E x c h a n g e th e p o w e r
s u p p ly b o a r d
E x c h a n g e th e m a in
b o a rd .
C h e c k th
h e a d . R e
r e p a ir ite
p r in te r m
e m o
fe r to
m o f
e c h a
to r a n d
th e
th e
n is m .
E N D
Figure 3-2. Flowchart 1
Troubleshooting
Unit Level Troubleshooting
41
EPSON Stylus Photo 750
2. Error is detected.
Revision A
3. Abnormal printing operation
S T A R T
Figure 3-3. Flowchart 2
Figure 3-4. Flowchart 3
Troubleshooting
Unit Level Troubleshooting
42
EPSON Stylus Photo 750
Revision A
4. Paper feed operation is not performed correctly
5. Abnormal Control Panel
S T A R T
Is
p a p e r s e t
in th e A S F
c o r r e c tly ?
S T A R T
Is
c o n tro
c o n n
c o rre
N O
S e t th e p a p e r c o r r e c tly
th e
l p a n e l
e c te d
N O
c tly ?
Y E S
Y E S
D o
th e P F r o lle r
a n d p la te n
ro ta te ?
N O
Is th e
P F m o to r
r u n n in g ?
R e m o v e a n y o b s tr u c tio n
in th e p a p e r p a th if
th e r e is a n y .
Y E S
Is th e
p r o b le m
s o lv e d ?
N O
C h e c k th e P F m o to r.
If th e r e is n o p r o b le m ,
r e p la c e th e m a in b o a r d .
Y E S
Is th e
p r o b le m
s o lv e d ?
N O
E N D
E N D
Figure 3-5. Flowchart 4
N O
R e p la c e th e
m a in b o a r d .
Y E S
R e fe r to S e c tio n 3 .5
" R e p a ir o f th e p r in te r
m e c h a n is m " .
E N D
Troubleshooting
Y E S
N O
R e p la c e th e c o n tr o l
p a n e l.
C le a n th e r o lle r o f
p a p e r p a th .
Is th e
p r o b le m
s o lv e d ?
C o n n e c t th e
c o n tro l p a n e l
c o r r e c tly .
E N D
Figure 3-6. Flowchart 5
Unit Level Troubleshooting
43
EPSON Stylus Photo 750
Revision A
3.3 Unit Repair (Power Supply Board)
This section describes the problems related to the power supply board. The table below provides various symptoms, likely causes, and checkpoints.
The checkpoints refer to waveforms, resistance, and other values to check to evaluate the operation of each component.
Table 3-5. Repair of the Power Supply Board
Sympto
m
Condition
Table 3-6. Repair of the Power Supply Board
Cause
Check point
Solution
F1 is open.
Check F1 is normal or not by using
a multimeter.
Replace
F1.
Trans T1 is
open.
Check T1 is normal or not by using
a multimeter.
Replace
T1.
Check the drain wave.
FET(Q1) is
broken.
The
printer
does not
operate at
all.
Sympto
m
Condition
Cause
Check point
Solution
Check the output wave(pin 8).
The
printer
does not
operate at
all.
+5VDC
line does
not work.
IC51(FA36
35A) is
broken.
Replace
IC51.
Replace
Q1.
+42VDC
line does
not work.
Check the collector wave.
Troubleshooting
Q2 or Q3 is
broken.
Replace
Q2 or
Q3.
PC1 is
broken.
Replace
PC1.
Unit Repair (Power Supply Board)
44
EPSON Stylus Photo 750
Revision A
3.4 Repair of the Control Board
This section describes the problems related to the power supply board. The table below provides various symptoms, likely causes, and checkpoints.
The checkpoints refer to waveforms, resistance, and other values to check to evaluate the operation of each component.
Table 3-7. Repair of the Control Board
Sympto
m
Condition
Cause
Table 3-8. Repair of the Control Board
Check point
Solution
Check +5VDC line(Pin 7 of IC8) and
reset signal (Pin 2 of IC8).
Reset
circuit is
broken.
The
printer
does not
operate at
all.
CPU does
not work.
ROM is not
selected
correctly.
Replace
IC8.
Check that the waveform of Pin 11
of IC3 reverses High/Low.
RAM is
broken.
Replace
T1.
Replace
Q1.
Check the signal waveform Pin 88
of IC1.
CPU is
broken.
Troubleshooting
Repair of the Control Board
45
EPSON Stylus Photo 750
Revision A
Table 3-9. Repair of the Control Board
Sympto
m
Condition
Cause
Check point
Solution
Check the signal waveform of
DATA(Pin 29) of IC14 and Common
NPNB/PNPB(Pin 16/19).
Abnormal
printing
Troubleshooting
IC12 is
broken.
If DATA
is not
input,
replace
IC2.
IC14 is
broken.
Replace
IC14.
Repair of the Control Board
46
EPSON Stylus Photo 750
Revision A
3.5 Unit Repair (Printer Mechanism)
This section provides instruction for repairing mechanism. It describes
various problems, symptom, likely causes, checkpoints, and solutions.
Select appropriate symptom from the the table and check each parts
and its function as describes in the checkpoint.
Table 3-11. Repair of the Printer Mechanism
Symptom
Condition
Table 3-10. Repair of the Printer Mechanism
Symptom
Abnormal
Pump
Mechanism
Defective
pump
absorption.
Condition
Abnormal PF
motor
operation
when the
power is
turned on.
Used ink does
not drain to
the waste ink
pad.
Troubleshooting
Cause
Check Point
Foreign
substances
are loaded in
the PF gears.
Manually drive
the PF drive
gear and
check if it
rotates
normally.
The PF motor
is defective.
Check the
inner coil
resistance and
see if there is
any
disconnection
of the coil.
(see
Table 3-1,
“Motor, Coil
Resistance,”
on page 39)
Exchange the
PF motor.
Check the
tube visually.
Exchange the
tube.
Check the
tube visually.
Change the
cap
mechanism.
The pump
tube is
crashed.
The cap is
damaged or
deformed.
Cause
Remove any
foreign
objects.
Check visually
if there is any
substances or
not.
Remove any
foreign
objects.
The CR motor
is defective.
Check the
inner coil
resistance and
see if there is
any
disconnection
of the coil.
(Table 3-1,
“Motor, Coil
Resistance,”
on page 39)
Exchange the
CR motor.
Manually
move the
carriage and
check if it
moves
smoothly.
Exchange the
tube.
Check the
tension of the
timing belt.
Repair the
tension
mechanism or
replace it.
Abnormal
carriage
operation.
Unit Repair (Printer Mechanism)
Carriage
operation is
abnormal
during the
printing
operation.
Solution
Foreign
substances
are loaded in
the CR drive
gears.
Solution
Carriage
operation is
abnormal
when tuning
on the power.
Check Point
Carriage
movement is
not smooth.
Check if there
is any foreign
substances on
the carriage
path.
Remove any
foreign
objects.
47
EPSON Stylus Photo 750
Revision A
Table 3-12. Repair of the Printing Mechanism
Symptom
Condition
Cause
Head FFC is
out of
connection.
Printing is not
performed.
Abnormal
printing
Carriage
moves but no
printing is
performed.
Only a
particular dot
causes
abnormal
printing.
Check visually if
the head FFC on
the board or
carriage is
connected firmly.
Solution
Check the FFC
Replace the
by using a tester. FFC.
I/C is
defective.
Install new I/C
and perform the
self-test.
Head Unit is
defective.
If the condition
does not improve
even after 2 or 3
times of cleaning
operation,
replace the head
unit and perform
the self-test.
Print head
surface is not
clean.
Check the
printing quality
after performing
the cleaning
several times.
Perform
cleaning.
Check the
printing quality
after performing
the cleaning
several times.
Replace the
head, if the
print quality
does not
recover.
Visually check
the condition of
the head
absorber.
Replace the
absorber in
the cap if it is
deformed.
Head unit is
defective.
Symptom
Condition
Replace I/C.
Replace the
head unit.
Cause
Print head
surface is not
clean.
Connect FFC
properly.
FFC is
disconnected
inside.
Absorber in
the cap is
touching the
head surface.
Troubleshooting
Check Point
Table 3-13. Repair of the Printing Mechanism
Sometime
printing is not
performed.
Abnormal
Printing
Unit Repair (Printer Mechanism)
Check Point
Perform cleaning
several times
and check the
print quality.
Solution
Perform
cleaning.
FFC is
disconnected
inside.
Check the FFC
Replace the
by using a tester. head FFC.
Head FFC is
out of
connection.
Install new I/C
and perform the
self-test.
Connect Head
FFC firmly.
Head Unit is
defective.
If the condition
does not improve
even after 2 or 3
times of cleaning
operation,
replace the head
unit and perform
the self-test.
Replace the
head unit, if it
does not
recover after
performing
cleaning.
I/C is
defective.
Install the new
I/C and perform
self-test.
Replace I/C.
The head FFC
is out of
connection.
Check if the
head FFC on the
board or carriage
is connected
surely.
The head unit
is defective.
Check
connection with
the head FFC.
Black specks
or dots.
Connect FFC
properly.
Replace the
head if there is
no connection
problem with
the FFC.
48
EPSON Stylus Photo 750
Revision A
Table 3-14. Repair of the Printer Mechanism
Symptom
Condition
A vertical
line is not
aligned.
Abnormal
Printing.
Abnormal
Paper
Feeding.
White line
appears in
the imaged
data.
Cause
Solution
Bi-directional
alignment is
not adjusted.
Perform Bi-D
adjustment.
Refer to Chapter 5
“Adjustment”.
Head angle is
not correct.
Perform head
angle
adjustment.
Refer to Chapter 5
“Adjustment”.
Platen gap is
not right.
Perform Platen
Gap adjustment.
Refer to Chapter 5
“Adjustment”.
Dot shooting
direction is
tilted because
head surface
is not clean.
Perform cleaning
several times
and check the
print quality.
Perform the
cleaning operation.
I/C is
defective.
Install the new
I/C and perform
self-test.
Replace I/C.
Head unit is
defective.
Head unit is
broken.
Replace the head
unit.
Friction of the
PF roller.
Check if the PF
roller rotates
when paper is
not fed.
Clean the PF roller
by the cleaning
sheet. Replace the
PF roller if it does
not recover.
Paper is not
fed.
Abnormal
operation of
the hopper.
Troubleshooting
Check Point
Check the
movement of the
ASF hopper
visually.
Table 3-15. Repair of the Printer Mechanism
Symptom
Condition
Paper is
not fed.
Abnormal
Paper
Feeding.
Printer
stops during
initialization.
Page
heading
position is
wrong.
Fatal error
appears.
Cause
Solution
Malfunction of
ASF drive
change-over.
Check if the ASF
gear rotates
visually.
Replace the
gears of the
ASF drive
change-over.
Friction of the
PF roller.
Check if the PF
roller slips during
the paper
feeding.
Clean the PF
roller by the
cleaning sheet.
Replace the PF
roller if it does
not recover.
ASF sensor is
defective.
Check the signal
level of the ASF
sensor.
Replace ASF
sensor.
PE sensor is
defective.
Check the signal
level of the PE
sensor.
Replace PE
sensor.
HP sensor is
defective.
Check the signal
level of the HP
sensor.
Head FFC is
disconnected.
Check if the
head FFC is
connected.
Connect the
head FFC.
CR motor is
defective.
Check the CR
motor cable is
connected.
Replace the CR
motor if there is
no problem in
the cable
connection.
PF motor is
defective.
Check if the PF
motor cable is
connected.
Replace the PF
motor if there is
no problem in
the cable
connection.
Replace the ASF.
Unit Repair (Printer Mechanism)
Check Point
49
&+$37(5
7
DISASSEMBLY AND ASSEMBLY
EPSON Stylus Photo 750
Revision A
4.1 Overview
This section describes procedures for disassembling the main
components of EPSON Stylus Photo750. Unless otherwise specified,
disassembly units or components can be reassembled by reversing the
disassembly procedure. Precautions for any disassembly or assembly
procedures are described under the heading “Caution”. Any adjustment
required after disassembling the units are described under the heading
“Required Adjustment”. Also, read precautions below before starting.
C A U T IO N
C A U T IO N
4.1.1 Precautions
A lithium battery is installed on the main board of this printer for backing
up the system clock. Mishandling the battery may cause explosion or
short. Read carefully the following precautions.
W A R N IN G
C A U T IO N
„ Disconnect the power cable before disassembling
or assembling.
„ A lithium battery is installed on the main board of
this printer. Be sure to observe the following
instructions when servicing the battery:
1. Do not get the battery shorted.
2. Do not install the battery in the wrong direction.
3. Do not heat the battery or put it near the fire.
Danger of explosion if the battery is incorrectly
replaced. Replace only with the same or equivalent
type recommended by the manufacture. Dispose of
used batteried according to government laws and
regulations.
Disassembly and Assembly
Risque d’explosion si la pile est remplacée
incorrectment. Ne remplacer que par une pile du même
type ou d’un type équivalent recommandé par le
fabricant. Eliminer les piles déchargées selon les lois
et les règles de sécurité en vigueur.
„ Since the fan inside of the printer interior does not
have a cover, do not touch it when it is running.
„ Handle with care for the electric parts inside of the
printer, since electrostatic may damage the
elements.
4.1.2 Tools
Use only specified tools to avoid damaging the printer.
Table 4-1. Tools
Name
Supplier
Parts No.
Phillips Screw Driver
(No.1)
EPSON
B743800200
Phillips Screw Driver
(No.2)
EPSON
B743800400
Nipper
EPSON
B740500100
Tweezers
EPSON
B741000100
Thickness gage
EPSON
B776702201
Overview
51
EPSON Stylus Photo 750
Revision A
4.1.3 Work Completion Check
If any service is made to the printer, use the checklist shown below, to
confirm that all works are completed properly and the printer is ready to
return to the user.
Table 4-2. Check List
Classifi
-cation
Item
Self-test
On-line test
Print head
Carriage
Mechanism
Main
Unit
Paper Feeding
Mechanism
Table 4-3. Check List
Classification
Adjustment
Check Point
Item
Specified
Adjustment
Check Point
Are all the adjustment done
correctly?
Status
†
Is the operation normal?
†
†
Is the printing successful?
†
Is ink discharged normally from all †
nozzle?
†
†
Does it move smoothly?
†
Is there any abnormal noise in its †
operation?
†
Is there any dirt or foreign objects †
on the CR guide shaft?
†
†
Is the CR motor at the correct
temperature? (Not too hot?)
†
†
Is paper advanced smoothly?
• No paper jamming?
†
Are all the lubrication made at the
specified points?
Checked
Not necessary
Lubrication
Lubrication
Is the amount of lubrication made
correctly?
Checked
Not necessary
Function
Checked
ROM version
Version:
Ink Cartridge
Are the ink cartridge installed
correctly?
Protective
materials
Have all relevant protective
materials been attached to the
printer?
Attachment,
Accessories
Have all relevant items been
included in the package?
Not necessary
Checked
Not necessary
Packing
Checked
Not necessary
Checked
Not necessary
Other
Status
† Checked
† Not necessary
†
†
†
†
†
†
†
†
†
†
Checked
Not necessary
Checked
Not necessary
Checked
Not necessary
Checked
Not necessary
Checked
Not necessary
† Checked
† Not necessary
Checked
Not necessary
Checked
Not necessary
• No paper skew?
• No multiple feeding?
• No abnormal noise?
Is the PF Motor at correct
temperature?
Is the paper path free of all
obstructions?
Disassembly and Assembly
†
†
†
†
Checked
Not necessary
Checked
Not necessary
Overview
52
EPSON Stylus Photo 750
Revision A
4.2 Disassembly
The flowchart below shows step-by step disassembly procedures.
S T A R T
H o u s in g R e m o v a l
B o a r d A s s e m b ly
R e m o v a l
C o n tro l P a n e l R e m o v a l
P r in te r M e c h a n is m
R e m o v a l
C a r tr id g e S e n s o r
R e m o v a l
P r in t H e a d R e m o v a l
A b s o rb e r T ra y ,
A s s e m b ly ;A R e m o v a l
P u m p A s s e m b ly , C a p
A s s e m b ly R e m o v a l
M o to r , A s s e m b ly , C R
R e m o v a l
M o to r A s s e m b ly ,P F
R e m o v a l
A S F , A s s e m b ly
R e m o v a l
P a p e r F e e d R o lle r
A s s e m b ly , R e m o v a l
R o lle r , A s s e m b ly ,
L D (R /L ) R e m o v a l
C a r r ia g e , A s s e m b ly
R e m o v a l
R o lle r , A s s e m b ly , P F
R e m o v a l
S e n s o r , A s s e m b ly , P E
R e m o v a l
S e n s o r, H P R e m o v a l
Figure 4-1. Flowchart
Disassembly and Assembly
Disassembly
53
EPSON Stylus Photo 750
Revision A
4.2.1 Housing Removal
Since this printer has no lower housing, the printer mechanism is
exposed just by removing the upper housing.
1. Open the printer cover and set the PG adjust lever on the right-hand
side to (+) position.
2. Remove 4 screws and remove the upper housing.
C H E C K
P O IN T
C A U T IO N
Pull the front edge of the upper housing while
lifting up the upper housing to remove it.
Be careful not to pinch the cable with the posts of the
upper housing when reinstalling it.
Figure 4-2. Housing Removal
Disassembly and Assembly
Disassembly
54
EPSON Stylus Photo 750
Revision A
4.2.2 Circuit Boards Removal
5. Fully separate “Shield Plate, M/B” from the printer mechanism.
Refer to “Check Point” and “Adjustment Required” on the next page.
6. When removing each board unit from “Shield Plate, M/B”, remove
each screw securing the each board (C259Main: 10 screws,
C257PSB: 4 screws), and remove each board.
1. Remove the upper housing. (“Housing Removal” on page -54)
2. Remove 5 screws securing the “Printer Mechanism” to the “Shield
plate, M/B”.
M A IN B o a rd
(C 2 5 9 M A IN )
P o w e r S u p p ly B o a r d
(C 2 5 7 P S B )
[C a b le H o ld e r s ]
S H IE L D P L A T E , M /B
S H IE L D P L A T E , M /B
Figure 4-3. Shield Plate, M/B Removal
3. Slightly pull out the “Shield Plate, M/B” and remove the cable holder
installed on the “Shield Plate, M/B”.
4. Disconnect all the cables from the connectors on the C259 main
board.
Disassembly and Assembly
Figure 4-4. C259 Main Removal
NOTE: When removing C257PSB, disconnect cables connected to
the C259 main board.
Disassembly
55
EPSON Stylus Photo 750
C H E C K
P O IN T
A D J U S T M E N T
R E Q U IR E D
Revision A
Unlock the connector CN6 and CN7 before
disconnecting them. Also, be sure to lock them when
reconnecting them.
After replacing C259 Main Board, perform the
following adjustments.
1. Head ID Writing (See “Head Voltage ID
Adjustment” on page -83)
2. Head Angular Adjustment (See “Head Angular
Adjustment” on page -84
3. Bi-D Adjustment (See “Bi-D Adjustment” on
page -86)
Disassembly and Assembly
Disassembly
56
EPSON Stylus Photo 750
Revision A
4.2.3 Control Panel Removal
1. Remove the upper housing.(See“Housing Removal” on page -54)
2. Remove 2 screws securing the control panel, then remove the
control panel from the printer mechanism.
3. Remove one screw securing the “Housing, Panel, Left” to the printer
mechanism.
4. Remove 2 screws securing the “Board, Assembly, Panel” to the
printer mechanism, then remove C209PNL board from the “Panel,
Assembly”.
5. Remove FFC from the connector on the C209PNL board.
C H E C K
P O IN T
By removing the control panel, the stacker assembly
can be also detached from the printer mechanism,
since it is held by the control panel assembly.
Figure 4-5. Control Panel Removal
Disassembly and Assembly
Disassembly
57
EPSON Stylus Photo 750
Revision A
4.2.4 Absorber Tray, Assembly;A Removal
1. Remove the upper housing.(See “Housing Removal” on page -54)
2. Remove the control panel. (See “Control Panel Removal” on
page -57)
3. Remove one screw securing the “Absorber Tray, Assembly;A” to the
right side of the printer mechanism.
4. Remove “Spacer Tray” securing “Absorber Tray, Assembly” at the
left side of the printer mechanism and remove “Absorber Tray,
Assembly;A” by pulling it downward.
C A U T IO N
C H E C K
P O IN T
Be sure to reset the waste ink counter, when
replacing the “Absorber Tray, Assembly;A” or
absorber(ink pad) inside. (See “Special Setting
Mode” on page -22)
After installing the “Absorber Tray, Assembly;A”, be
sure that 2 points of “Stopper Stacker” installed on
the exit roller shaft are pushed back to the back of
the rear side of protrusion of “Absorber Tray,
Assembly;A”.
Figure 4-6. Absorber Tray, Assembly;A Removal
Disassembly and Assembly
Disassembly
58
EPSON Stylus Photo 750
Revision A
4.2.5 Printer Mechanism Removal
4.2.5.1 Print Head Removal
1. Remove the upper housing.(See “Housing Removal” on page -54)
2. Rotate “Gear, 67.2” toward the front side of the printer and release
the carriage lock mechanism. Then, move the carriage assembly to
the left side.
3. Remove black and color ink cartridges.
4. Remove “Cover, Cartridge, B” and “Cover, Cartridge, C” from the
carriage assembly.
5. Remove the “Torsion Spring, 49” and one screw. Then, remove the
“Fastner, Head”.
6. Remove the “Head FFC” installed to the carriage assembly, and
remove the “Print Head Unit” form the carriage.
7. Remove the “Head FFC” from the connector on the driver board of
print head unit.
Figure 4-7. Print Head Removal
Disassembly and Assembly
Disassembly
59
EPSON Stylus Photo 750
C H E C K
P O IN T
Revision A
„ Be sure that the grounding plate is installed to the
carriage correctly. (There are 2 fixing pins on the
carriage.
„ After installing the print head to the carriage, be
Figure 4-8. Print Head Installation
Disassembly and Assembly
Disassembly
60
EPSON Stylus Photo 750
Revision A
4.2.5.2 Pump, Assembly/Cap, Assembly Removal
1. Remove the upper housing. (See “Housing Removal” on page -54)
2. Remove the control panel. (See “Control Panel Removal” on
page -57)
3. Remove “Absorber Tray, Assembly;A” (See “Absorber Tray,
Assembly;A Removal” on page -58)
4. Loosen 2 screws and disengage the “Frame, Assembly, Exit” and
side frame.
5. Sand up the printer mechanism so that you can see the bottom of
the printer mechanism.
6. Remove one hook securing the “Cap Assembly” at the right side of
the frame, and release the engagement with the frame by lifting up
the right side of “Cap Assembly”.
7. Pull out the “Cap Assembly” toward the bottom of the printer
mechanism. (However, “Cap Assembly” is still connected to the
“Pump Assembly” by the ink tube.)
8. Remove 2 screws securing the “Pump, Assembly” to the frame.
9. Release one hook securing “Pump Assembly” to the frame, and
move the “Pump Assembly” to left and remove it.
C A U T IO N
Figure 4-9. “Cap, Assembly” and “Pump Assembly” Removal
„ Be careful not to damage the rubber part of the cap.
„ When handling the “Cleaner, Head” installed at
“Pump Assembly”, be careful for following points.
• Do not touch the “Cleaner, Head” by bare hand. Use
globe and tweezers.
• When installing “Cleaner, Head”, its black rubber side
should face to the right side of the frame.
Disassembly and Assembly
Disassembly
61
EPSON Stylus Photo 750
C H E C K
P O IN T
Revision A
„ Since there is a spring inside the pump assembly,
be careful of the spring popping out.
„ When assembling, be careful not to pinch or give
pressure to the ink tube, which is connected
between “Pump, Assembly” and “Cap, Assembly”.
„ After installing the “Pump, Assembly”, rotate the
“Gear, 67.2” and check if the cleaner part moves
back and forth. (At this time, hold the “Cap,
Assembly” toward the right direction of the frame”)
C le a n e r , H e a d
Figure 4-11. Ink Tube
P u m p C o m p o n e n ts
A s s e m b ly O r d e r
Figure 4-10. Component Parts of “Pump, Assembly”
Disassembly and Assembly
Disassembly
62
EPSON Stylus Photo 750
Revision A
4.2.5.3 Motor, Assembly, CR Removal
1. Remove the upper housing.(See “Housing Removal” on page -54)
2. Rotate “Gear, 67.2” toward the front of the printer and disengage the
“Carriage Lock Mechanism”. Then, move the carriage to the center
of the platen.
3. Push “Holder, Pulley, Driven” to loosen the timing belt and detach
the timing belt from the pulley of the CR motor.
C o n p r e s s io n , S p r in g , 1 9 .6
P u lle y , A s s e m b ly , D r iv e n
T im in g B e lt
O u ts id e s id e fr a m e
T h e p r o je c tio n s o f m o to r a s s e m b ly m u s t
lo c a te in s id e th e h o le s
In s id e s id e fr a m e
Figure 4-13. Motor, Assembly, CR Removal
H o ld e r , P u lle y , D r iv e n
A D J U S T M E N T
R E Q U IR E D
Figure 4-12. Timing Belt Removal
4. Remove 2 screws securing the motor, and remove “Motor,
Assembly, CR”.
C H E C K
P O IN T
After replacing “Motor, Assembly, CR”, perform
Bi-D adjustment. (See “Bi-D Adjustment” on
page -86)
When installing “Motor, Assembly, CR”, be sure that
2 projections of the motor bracket are inserted to the
holes of the frame.
Disassembly and Assembly
Disassembly
63
EPSON Stylus Photo 750
Revision A
4.2.5.4 Motor Assembly PF Removal
4. Remove the hexagon nut and ”Motor, Assembly, PF”.
1. Remove the upper housing.(See “Housing Removal” on page -54)
2. Remove “Absorber Tray, Assembly;A”. (See “Absorber Tray,
Assembly;A Removal” on page -58)
C H E C K
P O IN T
3. Remove the following gears which are located at the left side of the
printer mechanism.
„ When removing the “Motor, Assembly, PF”, first,
slightly pull out the “Motor, Assembly, PF” from the
frame and slide the motor shaft to a larger cut out of
the frame and remove it.
„ Be careful for the routing direction of the cable from
the “Motor, Assembly, PF”.
„ Gear, 67.2
„ Combination gear, 8.8,21.6
M o to r , A s s e m b ly , P F
( b e h in d th e fr a m e )
„ Combination gear, 8,14.4
„ Gear, 36
C a b le D ir e c tio n
C o m p r e s s io n S p r in g , 0 .9
P u t th e m o to r s h a ft o n c e in a la r g e r h o ld
th e n s lid e it to a s m a lle r h o le
M o to r , A s s e m b ly , P F
H e x a g o n a l N u t
G e a r, 6 7 .2
Figure 4-15. Motor, Assembly, PF Installation
C o m b in a tio n G e a r , 8 , 1 4 .4
C o m b in a tio n G e a r , 8 .8 , 2 1 .6
G e a r, 3 6
L o c k R in g
Figure 4-14. Motor, Assembly, PF Removal
Disassembly and Assembly
Disassembly
64
EPSON Stylus Photo 750
Revision A
4.2.5.5 ASF, Assembly Removal
1. Remove the upper housing.(See “Housing Removal” on page -54)
2. Release the hook and remove “Gear,34” from the roller shaft of
“ASF, Assembly”.
3. Remove the cable from a hook of “ASF Assembly” and cable hook
of the “Printer Mechanism”.
4. Remove a “Shaft, Fixing, CR” and one screw securing “ASF,
Assembly” to the printer mechanism frame.
5. Remove the “ASF Assembly” from the mechanism by detaching the
projection at the left of “ASF Assembly” from the hole of the
mechanism.
C H E C K
P O IN T
C A U T IO N
„ When assembling “ASF, Assembly”, make sure that
“ASF, Assembly” is firmly attached to the
mechanism.
„ Use the fixing screws at the specified positions
below.
*Printer Left side: “Shaft, Fixing, CR”
*CR motor side: CBS Screw with washer
When installing the “ASF, Assembly”, be sure that
no cables are pinched between “ASF Assembly” and
frame. Especially, if the cables from the motor is
pinched, there is a danger of short-circuit and
possibly causes hazardous problem such as overheating or burning of components.
Disassembly and Assembly
Disassembly
Figure 4-16. ASF, Assembly Removal
65
EPSON Stylus Photo 750
Revision A
4.2.5.6 Paper Feed Roller Assembly Removal
1. Remove “ASF, Assembly”. (See “ASF, Assembly Removal” on
page -65)
H O P P E R , A S S E M B L Y
2. Remove “Torsion Spring,41.2” by unhooking one end from the ASF
frame and remove “Lever, Brake”.
L E V E R , B R A K E
T o r s io n S P R IN G , 4 1 .2
3. Remove “Bush, Fixing, Shaft” from the right end of “Shaft, Roller,
LD” and remove “Lever, Hopper, Release”.
4. Move the left paper feed to the center and remove the cam fixing
bush (white plastic) attached to the left side of “Shaft, Roller LD”.
C A M
5. Push the “Shaft, Roller, LD” to the left and remove the “Bush, Fixing,
Shaft, Left” after releasing its hook.
6. Unlock the right and left bottom edges of “Hopper Assembly” from
the “Frame, ASF”.
p a rt
F R A M E , A S F
B U S H , F IX IN G , S H A F T , L E F T
L E V E R , H O P P E R , R E L E A S E
7. Push out “Shaft, Roller, LD” to the right while lifting up the right side
of “Paper Feed, Roller Assembly, Right”, and remove “Shaft, Roller,
LD” from the left side of “Frame, ASF”.
8. Pull out cam part of “Hopper, Assembly” from the right hole of “ASF,
Frame”, holding down the “Upper, Assembly” by hand. From “ASF,
Assembly”, left and right “Paper Feed Roller Assembly” and
“Hopper, Assembly” will be separated.
C H E C K
P O IN T
„ When removing or installing the “Hopper,
Assembly”, be careful not to let the grease attach to
the other parts. If it is attached, wipe off completely.
„ Be careful of the direction when installing “Lever,
Hopper, Release”.
„ Make sure that bushes at the both ends of the shaft
are firmly attached.
Disassembly and Assembly
Disassembly
P a p e r F e e d R o lle r A s s e m b ly
B U S H , F IX IN G , S H A F T
S H A F T , R O L L E R , L D
Figure 4-17. ASF Disassembly
66
EPSON Stylus Photo 750
Revision A
4.2.5.7 Roller Assembly, LD Left/Right Removal
1. Remove “ASF, Assembly”. (See “ASF, Assembly Removal” on
page -65)
2. Remove right and left “Compression Spring, 1.66” from the back of
“Hopper, Assembly”.
3. Pull out the cam part of “Hopper, Assembly” through the hole of the
right frame of “Paper Feed, Roller Assembly, Right”. This will
separate “Paper Feed, Roller Assembly” and “Hopper, Assembly”.
4. Unlock “Roller Assembly, LD” from the assembly frame and remove
“Cover, Roller, LD” by unhooking it from the assembly frame. Then,
remove “Roller Assembly, LD”.
C H E C K
P O IN T
„ When installing “Roller Assembly, LD”, make sure
that it is hooked to the assembly frame firmly.
„ Before re-assemble the unit, make sure that
“Compression Spring, 1.66” is set on the assembly
frame and hooked to the hooks as it is shown in the
figure. This helps you easier assembly. After
assembling the unit, do not forget to unhook the
springs by rotating the spring from the holes
located at the back of the ASF assembly.
Figure 4-18. “Roller Assembly, LD” Removal
Disassembly and Assembly
Disassembly
67
EPSON Stylus Photo 750
Revision A
4.2.5.8 Carriage Assembly Removal
1. Remove the upper housing.(See “Housing Removal” on page -54)
B U S H , P A R A L L E L A D J U S T , R IG H T
B U S H , P A R A L L E L A D J U S T , R IG H T
2. Push “Holder, Pulley, Driven” to loosen the timing belt and detach
the timing belt from the pulley of CR motor assembly.
3. Take out “Compression Spring, 19.6” from “Holder, Pulley, Driven”.
4. Remove “Pulley, Assembly, Driven” with the timing belt from the
“Holder, Pulley Driven”.
5. Move the “Holder, Pulley, Driven” and release the hook, then
remove it from the frame.
6. Release the hook and remove the “Lever, PG”.
S id e fr a m e o f
p r in te r m e c h a n is m
7. Release the hook of “Lever, PG, Sub” and remove “Lever, PG, Sub”
and spring washer from the edge of the “Shaft, CR, Guide”.
C u t o u t o f s id e fr a m e
Figure 4-19. Bush Parallel Adjust Removal
8. Remove one screw securing “Bush, Parallel Adjust, Right” from the
right frame.
9. Rotate the “Bush, Parallel Adjust, Right” and match it with the cut
out of the frame. Then, remove the “Bush, Parallel Adjust, Right”.
Disassembly and Assembly
Disassembly
68
EPSON Stylus Photo 750
C H E C K
P O IN T
A D J U S T M E N T
R E Q U IR E D
Revision A
When installing the spring washer, convex side
should be facing to the “Bush, Parallel Adjust,
Right”. Be careful not to install in wrong direction.
Perform following adjustments, after replacing or
removing “Carriage Assembly”.
„ Paper Gap Adjustment (See “Paper Gap
Adjustment” on page -78)
„ Head Angular Adjustment (See “Head Angular
Adjustment” on page -84)
„ Bi-D Adjustment (See “Bi-D Adjustment” on
page -86)
Figure 4-20. Carriage Assembly Removal
Disassembly and Assembly
Disassembly
69
EPSON Stylus Photo 750
Disassembly and Assembly
Revision A
Disassembly
70
EPSON Stylus Photo 750
Revision A
4.2.5.10 Roller, Assembly, PF Removal
1. Remove the upper housing.(See “Housing Removal” on page -54)
2. Remove “Carriage, Assembly”. (See “Carriage Assembly Removal”
on page -68)
5. Remove “Torsion Spring,117.6” from the frame and remove 6
pieces of “Paper Guide Assembly, Upper”.
6. Remove “Paper Guide, Front;B”, releasing its hook.
3. Remove “PE Sensor Assembly”. (“PE Sensor Assembly Removal”
on page -70)
4. Remove 2 screws securing “Guide board, Cable” to the printer
mechanism, then remove “Guide Board, Cable”.
P A P E R G U ID E , L E F T
P A P E R G U ID E , A S S E M B L Y , U P P E R
S H A F T , P A P E R G U ID E , U P P E R
T O R S IO N S P R IN G , 1 1 7 .6
G U ID E P L A T E , C A B L E
( 6 p ie c e s )
Figure 4-23. “Roller, Assembly, Paper Exit” Removal
7. Release the locks of right and left shaft supports for the “Roller
Assembly, Paper Exit”, and remove the “Roller, Assembly, Paper
Exit”.
Figure 4-22. “Paper Guide, Assembly” Removal
Disassembly and Assembly
8. Unlock and release the left shaft support of “Roller, Assembly, PF”,
and match the cut out of the frame shaft and protrusion of the shaft
support.
Disassembly
71
EPSON Stylus Photo 750
Revision A
9. Move the whole “Roller, Assembly, PF” to the left direction, and
remove the “Roller, Assembly, PF”.
C H E C K
P O IN T
P u t "R O L L E R , A S S E M B L Y , P F " th ro u g h h e re
„ When reinstalling “Paper Guide, Assembly, Upper”
at the right edge, be careful not to damage the “PE
Sensor Lever”.
„ Be careful not to damage the hook, when removing
or installing “Paper Guide, Front; B”.
„ Be careful not to damage the black coated part of
“Roller, Assembly, PF” during disassembly and
assembly.
„ Be careful not to damage the gear, especially
engaging part.
R O L L E R , A S S E M B L Y , P F
Figure 4-24. “Roller, Assembly, PF” Removal
Disassembly and Assembly
Disassembly
72
EPSON Stylus Photo 750
Revision A
4.2.5.11 HP Sensor Removal
1. Remove the upper housing. (“Housing Removal” on page -54)
2. Disconnect the cable from “HP Sensor” and remove it by releasing
its hook.
S E N S O R , H P
C R M O T O R
Figure 4-25. HP Sensor Removal
Disassembly and Assembly
Disassembly
73
EPSON Stylus Photo 750
Revision A
4.2.5.12 Cartridge Sensor(Sensor, I/C) Removal
1. Remove one screw securing “Bush Holder, Sensor, I/C” to the
carriage assembly, and remove it.
Screw
3. Release 4 hooks(2 outer hooks, 2 inside hooks), which secure
“Holder, Sensor, I/C” with the carriage assembly”, and remove the
“Holder, Sensor, I/C” upward.
Bush Holder,
Sensor, I/C
Carriage Assembly
Engaging Hole
Engaging Holes
Figure 4-26. Bush Holder, Sensor, I/C Removal
Engaging part
of inside hook
Outside Hook
Inside Hook
Outside Hook
2. Remove “Harness, I/C” from the clamp part of the carriage.
Harness
Holder Sensor, I/C
Figure 4-28. Holder,Sensor, I/C Removal
4. Release 2 hooks of the hook, which secure the sensor to the
carriage assembly”, and remove the sensor and harness.
Figure 4-27. Removing Harness
Disassembly and Assembly
Disassembly
74
EPSON Stylus Photo 750
Revision A
Carriage Assembly
Sensor, I/C
Engaging parts
at the carriage side
Hooks
Figure 4-29. Sensor, I/C Removal
5. Separate “Sensor, IC” from the harness by releasing its connection.
C H E C K
P O IN T
„ Be careful of the direction of sensor, when
installing it. Switch part should face to the front
side.
„ When installing “Holder, Sensor, I/C” to the
“Carriage, Assembly”, do not pinch the harness
with carriage and holder.
Disassembly and Assembly
Disassembly
75
&+$37(5
8
ADJUSTMENT
EPSON Stylus Photo 750
Revision A
5.1 Overview
Note) “O”: Required Adjustment.
“NA”: Not applicable.
This section describes the procedure for adjustments required when the
printer is disassembled and assembled for repair.
5.1.1 Required Adjustment
Table 5-1 lists all the necessary adjustments for this printer. If any
service listed in this table is carried out, all adjustments corresponding
to that service should be performed to ensure proper operation of the
printer.
Table 5-1. Required Adjustment
Performance
Priority
1
2
3
4
5
Bi-D
Adjustme
nt
Paper Gap
Adjustme
nt
In Charge
VH Setting
Head
Angular
Adjustme
nt
Replacing the
printer
mechanism
NA
O
O
NA
O
Replacing the
C209 Main Board
NA
O
O
O
O
Replacing the
print head unit.
NA
O
O
O
NA
Replacing the CR
Motor.
NA
NA
NA
NA
O
Replacing or
disassembling the
carriage
assembly.
O
NA
NA
O
O
Replacing or
disassembling the
Roller Assembly.
O
NA
NA
NA
NA
Service/
Replacing parts
Adjustment
Overview
77
EPSON Stylus Photo 750
Revision A
5.2 Adjustment
This section describes the detailed procedures of each adjustment.
5.2.1 Paper Gap Adjustment
When replacing the carriage assembly or removing it during printer
mechanism disassembly, perform the paper gap adjustment during
assembling and get the standard distance from the surface of the
printing head to the paper surface.
C A U T IO N
„ Do not scratch special coated surface of the PF
roller and rib surface of “Paper Guide, Front ;B”.
„ Be careful not to leave any dirt or scars on the
surface of the print head.
† Paper Gap Adjustment
Figure 5-1. Paper Gap Adjustment
1. Install the “Bush, Parallel, Adjustment” for right and left frame and
set them on the peaking of the upper frame side so that they match
with the standard mark of “Bush, Parallel, Adjustment”.
2. Set the “Lever, PG” front. (Gap: “0”)
4. Move the carriage to the position that the print head overlaps the
thickness gauge.
C H E C K
P O IN T
3. Move the carriage to the center and set the thickness
gauge(1.14mm thick) on the fixed position of “Paper Guide, Front;B”
as you can see in the figure5-1.
C A U T IO N
Do not use the same thickness gauge you used for
Stylus Photo and Stylus Photo 700.
Adjustment
„ Leave the thickness gauge on the flat side of the rib
of the front paper guide;B.
„ When you move the carriage, move it , pulling the
timing belt with your hand.
5. Move the “Bush, Parallel, Adjustment, Right” to the rear until the
thickness gauge moves with the carriage when you move the
carriage about 20mm right and left. (Gap will be narrowed)
Adjustment
78
EPSON Stylus Photo 750
Revision A
6. From this thickness with which the thickness gauge stars moving
with the carriage, move the gear of the “Bush, Parallel, Adjustment
one notch forward you. (Gap will be narrowed)
At this time, make sure that the thickness gauge does not move.
P o s itio n M a r k
F o rw a rd
( G a p : W id e r )
B a c k w a rd
(G a p : N a rro w e r)
S id e F r a m e
"B U S H , P A R A L L E L A D J U S T , R IG H T "
"L E V E R , P G "
Figure 5-2. Paper Gap Adjustment
7. Perform the same procedures above (from 1 to 6) to the “Bush,
Parallel, Adjustment, Left”.
† Check the Gap
After completing the adjustment to “Bush, Parallel, Adjustment,
Left”, check the paper gap at the right side one more time.
† Fixing “Bush, Parallel, Adjustment, Right/Left”
After completing the paper gap adjustment, fix the “Bush, Parallel,
Adjustment, Left/ Right” by screws.
Adjustment
Adjustment
79
EPSON Stylus Photo 750
Revision A
5.3 Adjustment by Adjustment Program
P ro m p t-S P 7 5 0
A u to
In this printer, it is necessary to set the correct information for each
printer mechanism in order to maintain consistent printing function and
quality, eliminating difference of each printer mechanism’s
characteristics. Therefore, in case that the combination of the printer
mechanism and main board changes or the print head is replaced
during the repair service, you must set and save the correct information
to the main board, using the exclusive adjustment program.
5.3.1 Adjustment Program
This adjustment program(Sp750.EXE) consists of the menu to input the
model name and main menu for adjustments.
a d j1
C A U T IO N
„ You have to go through the menu to input the
model name in order to go to the main menu.
„ If the control board is replaced, it is necessary to
input the model name.
5. After setting the model name, program goes to the destination
menu.
P ro m p t-S P 7 5 0
A u to
5.3.1.1 How to use the Adjustment Program
1. Connect the PC(DOS/V computer) and printer by the parallel
interface cable, and turn on the printer, then, turn on the computer.
2. Either copy the adjustment program file to the hard disk of the
computer or insert the disk of adjustment program to the floppy disk
drive.
3. On the MS-DOS Prompt screen, type the program file name(Sp750)
and press return key.
4. Following screen appears and press Enter key.
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Adjustment
Adjustment by Adjustment Program
80
EPSON Stylus Photo 750
Revision A
6. Select “World”.
M a in m e n u
P ro m p t-S P 7 5 0
E S C K e y
A u to
R e tu rn K e y
a d j3
7. Select “Perform”, if “Printer is not ready” message is not indicated.
A d ju s tm e n t
M a in te n a n c e
M a r k e t/D e s tin a tio n C h e c k
H e a d C le a n in g ( C L 2 )
H e a d V o lta g e ID In p u t
In k C h a r g e F la g R e s e t
H e a d A n g u la r A d ju s tm e n t
T r a n s p o r ta tio n L iq u id C h a r g e
B i- D A d ju s tm e n t
P r o te c tio n C o u n te r v a lu e
A 4 C h e c k
P a tte rn
Figure 5-3. Options in the Program and Keys to Use
After this screen, menu screen will appear. Each function on the main
menu can be executed by ESC and ENTER keys.
Adjustment
Adjustment by Adjustment Program
81
EPSON Stylus Photo 750
Revision A
5.3.2 Setting Destination Information
P ro m p t-S P 7 5 0
A u to
1. Select “Adjustment” on the main menu and press Return key.
Program goes to the adjustment menu.
P ro m p t-S T 7 5 0
A u to
a d j5
P ro m p t-S P 7 5 0
A u to
a d j4
2. Select “Market Destination Check” and press Return key.
3. The screen shows “Checking the present Market Destination”.
Press Return key. Then, screen will indicate “Market Destination is
Standard for World”.
4. Go back to the adjustment menu by pressing ESC key. If you want
to change the destination, go back to the menu to input the model
name. Reset by changing the model name.
a d j6
Adjustment
Adjustment by Adjustment Program
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EPSON Stylus Photo 750
Revision A
5.3.3 Head Voltage ID Adjustment
P ro m p t-S P 7 5 0
Since the elements used in the print head differs, it becomes necessary
to set the head voltage in appropriate condition so that the amount of
discharged ink becomes even. The setting value is determined
according to the test result of head characteristics on the production
process.
A u to
1. Select “Adjustment” on the main menu and press Return key.
Program goes to the adjustment menu.
P ro m p t-S P 7 5 0
A u to
a d j9
3. Select “Change Data”, then the screen to input the Head ID
appears.
4. Input the Head ID (8 digits).
You can find VH voltage ID on the following position:
„ Print Head:
a d j8
2. Select “Head Actuator Voltage ID Input” and press Return key.
Following screen appears.
On the side face of the print head.
„ Printer mechanism: On the label of the packing box of the printer
mechanism.
5. After completing the Head ID input, press ESC key until the screen
returns to the adjustment menu.
If you wish to check the head data, select “Check the present data” to
check the current head data.
Adjustment
Adjustment by Adjustment Program
83
EPSON Stylus Photo 750
Revision A
5.3.4 Head Angular Adjustment
During production, slight variations are created in print heads and
carriage (which are used as a print head base). If these differences are
not adjusted, they can adversely influence the print head angle, and
result in the poor print quality.
Carriage
Assembly
Screw for
fixing the print
head
1. Select “Adjustment” on the main menu and press Return key.
Program goes to the Adjustment menu.
2. Select “Head Angular Adjustment” and press Return key.
P ro m p t-S P 7 5 0
A u to
Figure 5-4. Screw position for fixing the print head
P ro m p t-S P 7 5 0
A u to
a d j1 1
3. Loosen the screw fixing the print head. (See Figure 5-4, "Screw
position for fixing the print head")
4. Select “Print the Head Angular Adjustment Pattern”, and press
Return key. Then, the printer prints “Head Angular Adjustment
Pattern”.
Adjustment
Adjustment by Adjustment Program
a d j1 2
84
EPSON Stylus Photo 750
Revision A
5. Refer to the printing pattern, and adjust the head angle by using the
adjustment lever.
6. Head angular pattern is printed, every time the adjustment lever is
moved.
7. Repeat Step 4 to 6 until the angle becomes normal.
T o m o v e th is d o w n ,
8. After adjustment is completed, press ESC key until the screen goes
back to the adjustment menu.
9. Tighten the screw for fixing the head.
m o v e th e le v e r to th e
r ig h t ( r e a r ) .
C o r r e c t c o n d itio n = e v e n ly s p a c e d
T o m o v e th is u p ,
m o v e th e le v e r to
th e le ft ( fr o n t) .
A d ju s tm e n t L e v e r
a j1 1
Figure 5-5. Lever Operation and Corresponding Change in Pattern
C H E C K
P O IN T
„ When performing the head angular adjustment,
select “Move the carriage to the head angular
adjustment position” so that the carriage moves to
the center of the printable area. This enables the
adjustment lever to move easily. However, since the
head nozzle may dry out, move it within 5 seconds.
„ In order to make the carriage return to the home
position, select “Return the carriage to the home
position” and press Return key.
Adjustment
Adjustment by Adjustment Program
85
EPSON Stylus Photo 750
Revision A
5.3.5 Bi-D Adjustment
This adjustment is to correct differences in printing positions, which is
caused by slippage of printing timing in right and left directions during
the Bi-directional printing. The value adjusted in this section will be
stored as Bi-D corrected value in the EEPROM on the control board.
4. Refer to the Pattern Sample and see if all the lines are aligned from
the printed pattern.
5. Select “Adjust” on the Bi-D Adjustment Menu, if there is any nonaligned lines.
6. Refer to the pattern sample below and input the variable dot and
normal dot. (Setting range: -36 ∼+36)
1. Select “Adjustment” on the main menu and press Return key.
Program goes to the Adjustment menu.
2. Select “Bi-Directional Adjustment” and press Return key. Following
screen appears.
P ro m p t-S P 7 5 0
A u to
Figure 5-6. Bi-D Adjustment Pattern Sample
a d j1 3
3. Select “Print the Bi-D Adjustment Pattern”, and press Return key
twice. 3 Bi-D patterns of the current setting value and +/-2 levels are
printed at variable dot and normal dot.
Adjustment
7. Repeat Step 3 to 6 until Bi-D pattern become correct.
8. To finish the adjustment, press ESC key until the adjustment menu
appears.
Adjustment by Adjustment Program
86
EPSON Stylus Photo 750
Revision A
5.3.6 Head Cleaning
In this function, the same cleaning as the one from the control panel can
be performed from the adjustment program. With this sequence, you
can forcibly solve the clogged nozzle problem caused by viscous ink.
P ro m p t-S P 7 5 0
A u to
1. Select “Maintenance” on the Main Menu and press Return key.
2. Select “Head Cleaning” and press Return key.
PP rr oo mm pp tt -- SS PP 77 55 00
A A u u t ot o
a d j1 6
4. After the cleaning is completed, press ESC key until the screen
returns to the Maintenance Menu.
C A U T IO N
a d j1 5
3. Cleaning Mode Selection Menu appears. Again, press Return key,
then, cleaning will be performed.
Adjustment
„ Since the head cleaning consumes a lot of ink,
avoid excessive cleaning.
„ Ink quantity that is used for the cleaning differs
according to the previously printed lines or ink
quantity left in the ink cartridge.
„ If the problem is not solved by this head cleaning,
sometimes the initial ink charge may be able to
recover the condition.
Adjustment by Adjustment Program
87
EPSON Stylus Photo 750
Revision A
5.3.7 Initial Ink Charge
P ro m p t-S P 7 5 0
There is no ink charged in the ink path of a spare print head and printer
mechanism. Therefore, after you replace any of the following units,
perform initial ink charge and return the printer after making sure that
ink is ejected correctly from the print head. Perform initial ink charge at
the following cases.
A u to
„ After replacing the printer mechanism
„ After replacing or removing the print head
1. Select “Maintenance” on the main menu and press Return key. The
screen goes to the Maintenance Menu.
2. Select “Initial Charge Flag Reset” and press Return key. Then, the
screen goes to the “Initial Ink Charge Check Menu”.
a d j1 8
P ro m p t-S P 7 5 0
3. If you wish to perform the initial ink charge, press Return key. If not,
press ESC key.
A u to
C A U T IO N
„ Initial ink charge is performed, when the printer,
which is left at least 10 seconds after turning the
power Off, is turned back On again.
„ Since this operation consumes large amount of ink,
do not perform unnecessarily.
It takes about 2 minutes to complete the initial ink charge.
a d j1 7
Adjustment
Adjustment by Adjustment Program
88
EPSON Stylus Photo 750
Revision A
5.3.8 Counter Value for Ink Absorber
This function is for indicating the protection counter value for the waste
ink absorber and resetting the counter value. This function can be also
performed from the control panel. (See “Special Setting Mode” on
page -22)
5.3.8.1 Protect Counter Value
1. Select “Maintenance” on the main menu and press Return key. The
screen goes to the maintenance menu.
2. Select “Indication of the Counter Value for the Waste Ink Pad”, and
press Return key.
4. If the counter value exceeds the limit, replace the waste ink
pad(absorber) and reset the protect counter.
A u to
5. Press ESC key and return to the “Protect Counter Check/Clear
Menu”.
5.3.8.2 Protect Counter Reset
1. Select “Maintenance” on the main menu and press Return key. The
screen goes to “Maintenance Menu”.
2. Select “Indication of the Counter Value for the Waste Ink Pad”, and
press Return key. The screen goes to “Protect Counter Check/Clear
Menu”.
3. Select “Clear the protect counter value” and press Return key.
3. The screen goes to “Protect Counter Check/Clear Menu”. Select
“Check the present counter value” and press Return key. Then,
current protector count value appears.
Adjustment
4. Check if it is necessary to change the pad or not, and select “Yes”
and press Return key.
5. Press ESC key and go back to the Main Menu.
Adjustment by Adjustment Program
89
&+$37(5
9
MAINTENANCE
EPSON Stylus Photo 750
Revision A
6.1 Overview
6.1.2 Service Maintenance
This section describes the points and procedures for maintaining the
printer in its optimum condition.
If the print irregularity missing, white line, etc.) has occurred or the
printer indicates “Maintenance Request Error”, take the following
actions to clear the error.
6.1.1 Cleaning
This printer has no mechanical components which require regular
cleaning. Therefore, note that points suggested below are only to check
for dirt, and perform appropriate cleaning if necessary.
C A U T IO N
„ Never use chemical solvents, such as thinner, to
clean the printer. These chemicals can damage the
components of the printer.
„ Be careful not to damage the components when you
attempt to clean the inside the printer.
„ Do not scratch surface(coated part) of “Roller,
Assembly, PF”. Use soft brush to wipe off any dusts.
Use a soft cloth moistened with alcohol to remove the
ink stain.
† Exterior parts
Use a clean soft cloth moistened with water and wipe off any dirt. If
the exterior parts are stained with ink, use a cloth moistened with
neutral detergent to wipe it off.
† Inside the printer
Use a vacuum cleaner to remove any paper dust.
† Head Cleaning
The printer has a built-in head cleaning function and is activated
through the control panel operation.
1. Confirm that the printer is in stand-by state(the Power indicator is
not blinking), and press “Cleaning” button.
2. The printer enters the built-in cleaning sequence, and head cleaning
is performed.
† Maintenance Request Error
Ink is used for the operation such as cleaning as well as printing.
Therefore, the printer wastes certain amount of ink and counts the
amount of the wasted ink and drains it into the waste ink
pad(absorber). Once the amount of wasted ink reaches the
predefined limit, the printer indicates “Maintenance Request Error”.
Then, the waste ink pad should be replaced and ink consumption
counter recorded in EEPROM should be initialized.
1. Replace “Absorber Tray, Assembly;A”.
2. Turn the printer ON, holding down “Load/Eject” and “Cleaning”
buttons.
3. Press “Load/Eject” button, while the “Paper Out” LED is blinking.
Maintenance
Overview
91
EPSON Stylus Photo 750
Revision A
6.1.3 Lubrication
Table 6-2. Lubrication Point
The type and amount of oil and grease used to lubricated the printer
parts are determined based on the results of internal evaluations.
Therefore, be sure to apply the specified type and amount of oil and
grease to the specified part of the printer mechanism during servicing.
No.
„ Never use oil and the grease other than those
specified in this manual. Use of different types of
components can damage the component or give
bad influence on the printer function.
„ Never apply larger amount of lubricate than
specified in this manual.
C A U T IO N
Name
EPSON Code
Supplier
Grease
G-26
B702600001
EPSON
Oil
0-12
1038991
EPSON
• Apply grease while rotating
“Gear, 67.2”.
1
2
<Lubrication Point>
• Contact points between “Paper Guide,
Front” and each roller:
“Roller, PF” (1 point)
“Roller, Exit” (2 points)
<Lubrication Type> G-26
<Lubrication Amount>
• 10-mm long for “Roller, PF”
• 2-mm long for “Roller Exit”
• Lubricate the contact points
between the hooks on “Paper
Guide, Front” and each roller.
• Do not attach the grease to
the paper path.
• Use a syringe to apply it.
3
<Lubrication Point>
• Contact points between the carriage
assembly and “Frame, Upper”.
<Lubrication Type> G-26
<Lubrication Amount>
• Range from the HP sensor installation
point to the point where “Guide Plate,
Cable” is attached.
• After lubrication, make sure
that the carriage moves
smoothly.
• Use a syringe to apply it.
• Use a syringe to apply it.
<Lubrication Point>
• “Gear 67.2.”
• *Combination Gear, 16,21.6”
• “Gear, 23.2”
<Lubrication Type> G-26
• Rotate gears after applying
grease to evenly distribute it.
• Use a syringe to apply it.
4
Maintenance
Overview
Remarks
<Lubrication Point>
• Contact between “Roller, PF2 and
“Paper Guide, Rear”.
<Lubrication Type> G-26
<Lubrication Amount>
• A half turn of “Roller, PF”
Table 6-1. Specified Lubricants
Type
Lubrication Type/Point
• Do not attach the grease to
the paper path.
• Use a syringe to apply it.
92
EPSON Stylus Photo 750
Revision A
Table 6-3. Lubrication Point
Table 6-4. Lubrication Point
No.
Lubrication Type/Point
4
<Lubrication Amount>
• 1/4 of gear tooth for “Gear, 67.2”
• 1/3 of gear tooth for “Combination
Gear, 16,21.6”
• 1/3 of gear tooth for “Gear, 23.2”
• Rotate gears after applying
grease to evenly distribute it.
• Use a syringe to apply it.
<Lubrication Point>
The shaft for “Gear, 16, 40.8” on
“Frame, Left”.
<Lubrication Type> G-26
<Lubrication Amount>
Approximately 5 mm
• Use a syringe to apply it.
<Lubrication Point>
• Bushings for “Roller, PF”:
Left: Inside the bushing
Right: Inside the bushing(near the
pump assembly)
<Lubrication Type> G-26
<Lubrication Amount>
Approximately 3 mm diametrically
• For the right bushing, apply it
from the paper path side, and
wipe off any sticking out to the
cap assembly side.
• Rotate “Roller, PF” after
applying grease to evenly
distribute it in the bushing.
• Use a syringe to apply it.
<Lubrication Point>
• Both Left/Right Bushings for
“Roller, Exit”
<Lubrication Type> G-26
<Lubrication Amount>
• Evenly apply inside the bushings.
• Do not attach the grease to the
paper path.
• Use a syringe to apply it.
5
6
7
8
Remarks
No.
Maintenance
Overview
Remarks
• Avoid applying grease to
“Roller, Assembly, LD”
9
<Lubrication Point>
• ASF; The round hole in the right
frame of ASF (to hold the roller
shaft)
<Lubrication Type> G-26
<Lubrication Amount>
Evenly apply inside the hole.
• Completely wipe off any grease
sticking out to the inner side of
ASF.
10
<Lubrication Point>
ASF; Contact points between “Hopper”
and “Lever, Hopper, Release”.
<Lubrication Type> G-26
<Lubrication Amount>
Evenly apply lubrication to the points.
• Completely wipe off any grease
sticking out to the inner side of
ASF.
11
<Lubrication Point>
The round cutout in the left frame of
ASF (“Gear,34” is inserted to the
cutout)
<Lubrication Type> G-26
<Lubrication Amount>
Evenly apply inside the hole.
12
• Apply that the holder slides
<Lubrication Point>
only with spring force after
• Contact points between “Holder,
applying grease.
Pulley Driven” and “Frame, Upper”
•
Use
a syringe to apply it.
<Lubrication Type> G-26
<Lubrication Amount>
• 2 mm long for each point.
Lubrication Type/Point
<Lubrication Point>
Oil pad in the carriage assembly.
<Lubrication Type> O-12
<Lubrication Amount>
0.7cc
Note: This is the amount to be applied
to a new oil pad.
Lubricate the oil pad only when;
*Replacing the carriage assembly.
*Replacing the oil pad
Use a precise syringe to apply it. If
you accidentally apply too much oil
to the oil pad, throw the pad away
and take a new one again.
Leave the oil pad for a while to wait
until oil is evenly infiltrated, then
install it on the carriage assembly.
93
EPSON Stylus Photo 750
Maintenance
Revision A
Overview
94
EPSON Stylus Photo 750
Revision A
"H O L D E R , P U L L E Y , D R IV E N "
* N e v e r a p p ly th e o il e x c e e d in g 0 .6 c c .
N o .1 2
( O il p a d )
C a r r ia g e A s s e m b ly
( b o tto m v ie w )
N o .8
"H O P P E R , A S S E M B L Y "
"S H A F T , C R , G U ID E "
N o .1 0
"F R A M E , A S F "
N o .9
Maintenance
Overview
95
&+$37(5
:
APPENDIX
EPSON Stylus Photo 750
Revision A
7.1 Connector Summary
Table 7-1. Connector Summary for C259Main
7.1.1 Major Component Unit
Connector
Major component unit of this printer is as follows.
† Control Panel (C209PNL)
† Printer Mechanism (M-4M11)
The figure below shows how these components are connected.
AC
Table to refer.
CN1
Parallel Interface
Connector
Parallel Interface(forward channel)
(See page -14)
CN2
Mac.Serial Interface
Connector
Serial Interface
(See page -18)
CN3
SUB Interface Connector
USB(Universal Serial Bus) interface
(See page -19)
CN4
HP Sensor
Table7-2
CN5
PE Sensor
Table7-3.
CN6
ASF Sensor
Table7-4
CN7
CR Motor
Table7-5
CN8
PF Motor
Table7-6
CN9
Print Head
Table7-7
CN10
Power Supply Connector
Table7-8
CN11
Control Panel
Table7-9
† Control Board (C259 MAIN or C264 MAIN)
† Power Supply Board (C257 PSB/C257 PSE)
Function
CN1
C206PSB/PSE
(Power Supply
Board)
C259/C264MAIN
(Main Board)
CN11
Control Panel
CN9
CN2
CN10
Parallel I/F
CN1
Serial I/F
CN2
CN7
Table 7-2. Connector CN4
CN8
CN6
Pin
Signal Name
I/O
Function
1
HP
In
Sensor detect signal
2
GND
---
Ground
3
HPV
---
Sensor Power Supply
CN14 CN5
PF
CR
Motor Motor
PE Sensor
HP Sensor
ASF Sensor
Print Head
Cartridge Sensor
Printer Mechanism
Figure 7-1. Connection of the Major Components
Appendix
Connector Summary
97
EPSON Stylus Photo 750
Revision A
Table 7-3. Connector CN5
Pin
Signal Name
I/O
Function
1
PE
In
2
GND
3
PEV
Table 7-6. Connector CN8
Pin
Signal Name
I/O
Function
Sensor detect signal
1
PFA
Out
Phase drive signal (A)
---
Ground
2
PFB
Out
Phase drive signal (B)
---
Sensor Power Supply
3
PF-A
Out
Phase drive signal (-A)
4
PF-B
Out
Phase drive signal (-B)
Table 7-4. Connector CN6
Pin
Signal Name
I/O
Function
1
ASF
In
Sensor detect signal
2
GND
---
3
ASFV
---
Table 7-7. Connector CN9
Pin
Signal Name
I/O
Ground
1
BCO
In
Black ink cartridge detect signal
Sensor Power Supply
2
CCO
In
Color ink cartridge detect signal
3
THM
In
Thermistor detect signal
4
GND
---
Ground
5
LAT
Out
6
GND
---
Table 7-5. Connector CN7
Head data latch pulse output
Pin
Signal Name
I/O
1
CRA
Out
Phase drive signal (A)
7
S16
Out
Head data output (6)
2
CR-A
Out
Phase drive signal (-A)
8
S15
Out
Head data output (5)
3
CRB
Out
Phase drive signal (B)
9
S14
Out
Head data output (4)
4
CR-B
Out
Phase drive signal (-B)
10
S13
Out
Head data output (3)
11
S12
Out
Head data output (2)
12
S11
Out
Head data output (1)
13
GND
---
14
CLK
Out
Appendix
Function
Function
Connector Summary
Ground
Ground
Clock pulse for head data transfer
98
EPSON Stylus Photo 750
Revision A
Table 7-8. Connector CN9
Pin
Signal Name
I/O
15
GND
--
16
NCHG
Out
17
GND
18
Table 7-9. Connector CN10
Pin
Signal Name
I/O
Ground
1
+42V
---
Mechanism Drive Power Supply
All Head On Pulse Output
2
+42V
---
Mechanism Drive Power Supply
--
Ground
3
GND
---
Ground
VDD
---
Logic power supply (+5V)
4
GND
---
Ground
19
GND2
--
Ground
5
PSC
Out
20
GND2
---
Ground
21
GND2
---
Ground
6
GND
---
Ground
22
GND2
---
Ground
7
GND
---
Ground
23
COM
---
Head Drive Power Supply
8
+5V
---
Logic Power Supply
24
COM
---
Head Drive Power Supply
25
COM
---
Head Drive Power Supply
Pin
Signal Name
I/O
Function
26
COM
---
Head Drive Power Supply
1
SW2
In
Panel Switch on/off (2)
27
VHV
---
Head Drive Voltage Control Signal
2
SWO
In
Panel Switch on/off (0)
3
PSC
In
Power on/off switch
4
SW1
In
Panel switch input (1)
5
LED3
Out
LED drive signal (3)
6
+5V
---
Logic power supply
7
+5V
---
Logic power supply
8
LED2
Out
LED drive signal (2)
9
GND
---
10
LED1
Out
11
GND
--
12
LE0
Out
Appendix
Function
Function
Power Supply Switch Output
Signal
Table 7-10. Connector CN11
Connector Summary
Ground
LED drive signal (1)
Ground
LED drive signal( 0)
99
EPSON Stylus Photo 750
Revision A
7.2 Component Layout
Figure 7-2. C259 Main Component Layout
Appendix
Figure 7-3. C259 Main Component Layout (Soldered Side)
Component Layout
100
EPSON Stylus Photo 750
Revision A
Figure 7-4. C257PSB Component Layout
Appendix
Component Layout
101
EPSON Stylus Photo 750
Revision A
7.3 Exploded Diagram
Following pages shows exploded diagram of Stylus Photo 750.
126
102
751
115
766
500
766
752
105
126
125
180
450
135
106
107 125
125
752
101
181
for EAI,
LATIN
124
124
132
182
753
133
122
104
for LATIN
119
124
122
400 for EAI
103
124
400 for ETT
123
For EUR,S.E.ASIA,
OCEANIA,RUSSIA
134
400
123
401
100
EXPLODED DIAGRAM FOR EPSON STYLUS PHOTO 750 (1/3)
Figure 7-5. Exploded Diagram-1
Appendix
Exploded Diagram
102
EPSON Stylus Photo 750
Revision A
Figure 7-6. Exploded Diagram 2
Appendix
Exploded Diagram
103
EPSON Stylus Photo 750
Revision A
Figure 7-7. Exploded Diagram 3
Appendix
Exploded Diagram
104
EPSON Stylus Photo 750
Revision A
7.4 Electric Circuit
Next pages shows the following electric circuits.
† C259(or C264) MAIN Control Circuit
† C257 PSB/C257 PSE Power Supply Circuits
Appendix
Electric Circuit
105