Epson 750 User Manual

Notice

†

All rights reserved. No p art of t his manual may be reprod uced, stored i n a ret rieval syste m, or trans mit ted 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.

PRECAUTIONS

Precautionary notations throughout the text are categorized relative to 1)Personal injury and 2) damage to equipment.

DANGER

WARNING

The precautionary measures itemized below should always be observed when performing repair/maintenance procedures.

Signals a precaution which, if ignored, could result in serious or fatal personal injury. Great cauti on should be exercised in performing procedures preceded by DANGER Headings.

Signals a precaution which, if ignored, could result in damage to equipment.

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

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

Symbols Used in This Manual

Various symbols are used throughout this manual either to provide additional information on a specif ic 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, coul d result in in jury or loss of life.

CAUTION

CHECK

PO INT

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 Issued Date Description

Rev. A December 14, 1998 First Release

Stylus Photo 750 Revision A

Table of Contents

Product Description

Overview................ ....... ...... ...... ....... ...... ....... ...... ....... ..................................... 4

General Characteristics............................................................................. 4

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

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

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

Consumables and options....................................................................... 26

Operating Principles

Overview ...................................................................................................... 28

Printer Mechanism .................................................................................. 28

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

Disassembly and Assembly

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

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

PRODUCT DESCRIPTION

&+$37(5

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;

† Hi gh 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/m „ Holds 10 envelopes „ Holds 10 transparency films „ 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

)

Figure 1-1. Exterior View of Stylus Photo 750

Product Description Overview 4

EPSON Stylus Photo 750 Revision A

1.2 General Description

1.2.1 Printing

PRINTING METHOD

† On demand ink jet

NOZZLE CONFIGURATION

† 48 nozz les x 6 (Black, Cyan, Magenta, Yellow, Light Cyan, Light

Magenta)

#48

(3 /3 6 0 ")

0.212 m m

PRINTING SPEED AND PRINTABLE COLUMNS

† Character mode

Table 1-1. Printing Speed

Character Pitch Printable columns LQ speed

10 CPI (Pica) 80 200CPS**

** This value is the speed of one print-pass in whic h the 1/3 of char acter matrix is printed.

† Raster gr aphics mode

Table 1-2. Raster Graphics Mode

Horizontal resolution

180 dpi 8.26 inch 1488 20 IPS 360 dpi 8.26 inch 2976 20 IPS 720 dpi 8.26 inch 5952 20 IPS

Printable area Available dot CR Speed

CONTROL CODE

† ESC/P Raster † EPSON Remote command

Bk C yan LC M LM

Figure 1-2. Nozzle Configuration

Y sp02

CHARACTER TABLES

† 2 international character sets

PRINTING DIRECTION

† Bi-direction with logic seeking

„ PC437 (US, Standard Europe) „ PC850 (Multilingual)

Product Description General Description 5

EPSON Stylus Photo 750 Revision A

TYPEFACE

† Bin map LQ font: EPSON Courier, 10 CPI

1.2.2 Paper Feeding

† Feed ing Method: Friction feed with ASF † Paper Path: Cut-sheet ASF(Top entry) † Feeding Speed: 2.36 inches/sec (normal speed mode/continuo us

feeding)

4.5 inches/sec (high-speed mode/continuous feeding)

1.2.3 Paper Specification

This section describes the printable are a and types of paper which can be used in this printer.

„

CAUTION

No curled, wrinkled, scuffing or torn paper be used.

„

Printing should be performed at room temperature for transparency and envelope.

„ Thickness: 0.08mm(0.003”)-0.11mm(0.004”)

„ Weight: 64g/m

(17lb.) - 90g/m2(24lb)

„ Quality: Exclusive paper, Bond paper, PPC

† Transparency and Glossy Paper

„ Size: 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 avai labl e at normal temp erature.

† Envelope

„ Size: 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/m

(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: 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”))

† Index Card

„ 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”)

Photo Paper (Width 101.6mm(4”) x Length 152.4mm(6 ”))

„ Thickness: Less than 0.23mm(0.0091”)

Product Description General Description 6

EPSON Stylus Photo 750 Revision A

1.2.4 Printable Area

† Cut Sheet The figure below shows printable area.

Printable area

Paper Size

Letter

Legal

Statement

Executive

Paper Width

(typ)

210mm

(8.3”)

216mm

(8.5”)

216mm

(8.5”)

139.7mm (8.5”)

182mm

(7.2”)

184.2mm

(7.25””)

Table 1-3. Printable Area

Paper

Length

(typ.)

297mm

(11.7”)

279mm

(11.0”)

356mm

(14.0”)

215.9mm (8.5”)

275mm

(10.1”)

266.7mm

(10.5”)

Left

Margin

(min.)

3mm

(0.12”)

3mm

(0.12”)

3mm

(0.12”)

3mm

(0.12”)

3mm

(0.12”)

3mm

(0.12”)

Right

Margin

(min.)

3mm

(0.12”)

9mm

(0.35”)

9mm

(0.35”)

3mm

(0.12”)

3mm

(0.12”)

3mm

(0.12”)

Top

Margin

(min.)

3mm

(0.12”)

3mm

(0.12”)

3mm

(0.12”)

3mm

(0.12”)

3mm

(0.12”)

3mm

(0.12”)

Bottom

Margin

(min.)

14mm(0.54”)

/3mm

(0.12”)*

14mm(0.54”)

/3mm

(0.12”)*

14mm(0.54”)

/3mm

(0.12”)*

14mm(0.54”)

/3mm

(0.12”)*

14mm(0.54”)

/3mm

(0.12”)*

14mm(0.54”)

/3mm

(0.12”)*

14mm(0.54”)

/3mm

(0.12”)*

Photo Paper

Note)

Bottom margin can be set up to 3mm at minimum when t he paper

101.6mm (4”)

152.4mm (6”)

3mm

(0.12”)

3mm

(0.12”)

3mm

(0.12”)

length is designated with “ESC(S” command.)However, th ere is the

Figure 1-3. Printable Area

possibility that a printing scramb les 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.

Product Description General Description 7

EPSON Stylus Photo 750 Revision A

† Envelope

Paper Size

#10 28mm(1.10”) 3mm(0.12”) 3mm(0.12”) 14mm(0.55”)

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”)

LM(Left

margin)

(min.)

Table 1-4. Envelope

RM(RIght

margin)

(min.)

TM(Top margin)

(min.)

BM(Bottom

margin)

(min.)

1.2.5 Adjust Lever Settings

The adjust lever located under the printer cover(right side) needs to be set for the proper paper setting according to the paper type.

Table 1-5. Setting Position of Adjust Lever

Paper Lever position Adjustment Value

Normal paper,

Transparency

sheet, Label

Envelope 0 0mm

+ +0.9mm

Printable A rea

Figure 1-4. Printable Area

Figure 1-5. Adjust Lever

Product Description General Description 8

EPSON Stylus Photo 750 Revision A

(

)

1.2.6 Environmental Conditions

† Temperature:

„ Operating: 10 to 35 „ Non-operating: -20 to 60

NOTE:1 month at 40°C and 120 hours at 60

† Humidity:

„ Operating: 20 to 80% RH(*2,*3) „ Non-operating: 5 to 85% RH(*1,*2)

Hum idity (% R H )

°C(*3)

°C(*1)

°C

† Resistance to shock:

„ Operating: 1G, within 1ms „ Non-operating: 2G, within 2ms(*1)

† Resistance to vibration:

„ Operating: 0.15G „ Non-operating: 0.50G (*1)

NOTE:*1:with shipment container

*2:without condensation *3:Refer to Figure1-6 for Environmental Condition.

G uranteed R ange

50 F

(80 F)

(95 F)

Tem perature

( F )

Figure 1-6. Environmental Condition

Product Description General Description 9

EPSON Stylus Photo 750 Revision A

Yellow

Light M agenta

M agenta(M )

(L M )

(Y )

Light C yan(LC )

Cyan

(C )

1.2.7 Ink Cartridge

1.2.7.1 Black Ink Cartridge

† Type: Exclusive cartridge † Color: Black † Print capacity: 540 pages/A4 (ISO/IEC1056 1 Letter Pattern at 360

dpi)

† Ink life: 2 years from production date † Storage temperature:-20

† Dimension: 19.8mm(W) x 52.7 mm (D)x 38.5mm(H)

°C to 40°C(Storage within a month at 40°C)

°C to 40°C(Packing storage, within a month

-30 at 40

-30 and within a month at 40

°C)

°C to 60°C(Transit, within 120 hours at 60°C

°C)

1.2.7.2 Color Ink Cartridge

† Type: Exclusive cartridge † Color: Magenta, Cyan, Yellow, Light Magenta, Lig h t Cyan † Print capacity: 220 pages/A4 (360 dpi, 5% duty each color) † Ink life: 2 years from production date † Storage temperature:-20

† 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

be usable again being placed at room temperature for 3 hours.

°C to 40°C(Storage within a month at 40°C)

°C to 40°C(Packing storage, within a month

-30 at 40

-30 and within a month at 40

°C)

°C to 60°C(Transit, within 120 hours at 60°C

°C

°C environment. However, it will

Product Description General Description 10

Figure 1-7. Black Ink Cartridge

Figure 1-8. Color Ink Cartridge

EPSON Stylus Photo 750 Revision A

1.2.8 Input Data Buffer

† Buffer: 256 Kbytes

1.2.9 Electric Specification

† 120V version

„ Rated voltage: AC 120V „ Input voltage range: AC 99 -132V „ Rated frequency range:50 - 60Hz „ Input frequency range:49.5-60.5 Hz „ Rated current: 0.4A(Max.0.5A) „ Power consumption: Approx.18W(I SO/IEC 10561 Lett er

pattern) Energy Star compliant

„ Insulation Resistance:10 M ohms min. (between AC line and

chassis, DC 500V)

„ Dielectric: AC 1000 V rms. 1 minute or

AC 1200 V rms 1 second(between AC line and chassis)

† 220-240V version

„ Insulation Resistance:10 M ohms min. (between AC line and

chassis, DC 500V)

„ Dielectric: AC 1500 V rms. 1 minute (between AC

line and chassis)

1.2.10 Reliability

† Total print volume: 10,000 pages(A4, Letter) † Print Head Life: 2000 million dots/nozzle

1.2.11 Safety Approvals

† 120V version

„ Safety standard: UL1950 with D3

CSA22.2 No.950 with D3

„ EMI: FCC part 15 subpart B classB

CSA C108.8 class B

† 220-240V version

„ Safety standard: EN60950(VDE, NEMKO)

EN55022(CISPR Pub.22) class B AS/NZS 3548 class B

„ Rated voltage: AC220-240V „ Input voltage range: AC 198 -264V „ Rated frequency range: 50 - 60Hz „ Input frequency range:49.5-60.5 Hz „ Rated current: 0.2A(Max.0.3A) „ Power consumption: Approx.18W(I SO/IEC 10561 Lett er

pattern) Energy Star compliat

Product Description General Description 11

1.2.12 Acoustic noise

† Level: Approx. 47 dB(A) (According to ISO 7779)

EPSON Stylus Photo 750 Revision A

1.2.13 CE Marking

† 220-240 V version

„ Low Voltage Directive 73/23/EEC:EN60950 „ EMC Directive 89/336/EEC: 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

< Graphic Mode >

† General operation:

„ Initialize Printer: ESC @ „ Unidentical Printing: ESC U „ 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 motio n

„ 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 Revision A

„ Dot size control: ESC (e „ Raster header: ESC (D „ Raster body: ESC i

† 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 inte rface, 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 Specification

Transmission mode 8bit parallel, IEEE-1284 compatibility mode

Synchronization By STROBE pulse

Handshaking By BUSY and ACKNLG signal

Signal Level TTL compatible level

Adaptable connector 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 select ed.

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

PE signal is at high level during paper-out error.

Table 1-7. Connector pin assignment and signals

Pin.

1 -STROBE 19 In

2-9 Data0-7 20-27 In

10 -ACKNLG 28 Out

11 BUSY 29 Out

12 PE 28 Out A high signal indicates paper-out error.

13 SLCT 28 Out

14 -AFXT 30 In Not used.

31 -INIT 30 In

Signal

Name

Return

GND pin

In/Out Function Description

The strobe pulse. Read-in of data is

performed at the falling edge of this

pulse.

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.

This signal is a negative pulse incl udi ng

that the printer can gain accept data.

A high signal indicates that the printer

cannot receive data.

Always at high level when the printer is

powered on.

This falling edge of a negat ive puls e or a

low signal on this li ne caus es the p rinter

to initialize Minimum 50 us pulse is

necessary.

32 -ERROR 29 Out

36 -SLIN 30 In Not used.

A low signal indicates printer error

condition.

Product Description Parallel Interface 14

EPSON Stylus Photo 750 Revision A

Pin.

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.

16,33 19-30

15,34 NC --- --- Not connected.

Signal

Name

Chassis

GND

GND --- --- Signal GND.

Return

GND pin

--- --- Chassis GND.

In/Out Function Description

NOTE:In/Out refers to the direction of signal flow from the printer’s

point of view.

1.3.2 Parallel Interface(Reverse channel)

Reverse channel is used to transfer the in formation data from the pri nter side to the PC side.

Table 1-8. Connector pin assignment and signals

Item Specification

Transmission mode 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 TTL compatible level

Adaptable connector 57-30360(amphenol) or equivalent

† Extensibility request: The printer responds affirmatively when the

extensibility request values are 00H or 04H, that me an, 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 Revision A

„ 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.

Pin.

1 HostClk 19 In Host clock signal.

2-9 Data0-7 20-27 In

10 PtrClk 28 Out Printer clock signal.

Table 1-9. Connect pin assignment and signals

Signal

Name

Return

GND pin

In/Out Function Description

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.

14 HostBusy 30 In Host busy signal. 31 -INIT 30 In Not used.

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.

16,33 19-30

15,34 NC --- --- Not connected.

PtrBusy/

DataBit-3,7

AckDataReq/

DataBit-2,6

Xflag/

DataBit-0,4

-DataAvail/ DataBit-0,4

Chassis

GND

GND --- --- Signal GND.

29 Out

28 Out

29 Out

-- -- Chassis GND.

Printer busy signal and revers e chann el

transfer data bit3 or 7.

Acknowledge data request signal and

reverse channel transfer data bit2 or 6.

X-flag signal and reverse channel

transfer data bit 1 or 5.

Data available signal and reverse

channel transfer data bit 0 or 4.

Product Description 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

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

• Start bit 1bit

Word format

Handshaking X-ON/X-OFF, DTR protocol

Adaptable connector 8-pin mini circular connector

Recommended interface cable Apple System Peripheral-8 cable

Table 1-12. Connector pin assignment and signals

Pin No.

Signal

Name

In/Out Function Description

• Data bit 8bit

• Parity bit none

• stop bit 1bit

Following figure shows port arrangement of serial I/F connector.

Figure 1-10. Serial I/F Connector Port

Following table shows timing relation of DTR, X-ON/X-OFF handshaking.

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 data6 TxD+ Out Balanced Transmit+ 7 DTR Out Data terminal ready 8 RxD+ In Balanced Receive+

State Buffer space X-on/X-off DTR

Busy

Ready

Table 1-13. X-ON/X-OFF, DTR protocol

Less than 3072

bytes

More than 5120

bytes

Send X-OFF code Off

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

Pin 1

Pin 2

Pin 3

Pin 4

1.3.4 USB(Universal Serial Bus) Interface

Following shows specification.

† Standard: Based on

„ Universal Serial Bus Specifications Revision 1.0 „ Universal Serial Bus Device Class Defi nition for Printin g Devices

version 1.0

† Bit rate: 12Mbyte(Full Speed Device) † Data encording: NRZI † Adaptable connector: USB Series B † Recommended cable length: 2 meters

Table 1-14. Connector pin assignment and signals

Pin.

1VCC --

2 -Data

3+Data

4 Ground -- Cable ground.

Signal Name I/Out Function Description

Cable power. Maximum power

consumption is 100mA.

Bi-

directional

Bi-

directional

Data. Pull up to +3.3V via 1.5K ohm

Data

resistor.

Figure 1-11. USB Interface Port

Product Description 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 t ransfer to periph erals 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 pri nter is i n busy state cont inuously when the input buffer is full.

1.3.6 Interface selection

The printer has 3 built-in interf aces; Par al lel I/F, Mac seri al I/ F and USB I/F. These interfaces are selected automati cally.

„ Automatic selection

In this automatic interface selecti on 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 transf e r and the printer is in the stand-by state for the second s, the printer is returned to the idle state. As long as the host sends data or the printer interface i s bus y stat e, the s ele cted in ter face i s let as i t is .

„ Interface state and interface selection

When the parallel interface is not selected, the int erface 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 interf ace is not selected.

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 synchro nous 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 synchron ous 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 whic h 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 effec t on the othe rs. The protocol operate over IEEE1284.

Product Description Parallel Interface 20

EPSON Stylus Photo 750 Revision A

1.4 Function

1.4.1 Control Code

This printer is operated with the raster graphi cs 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.

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 swit ches, 1 l ock t ype push swi tch and 4 LEDs. The figure below shows the exterior view of the control panel.

Power LED :Green

Paper out LE D:R ed

In k O ut (B lack)LE D :R ed

Power SW

In k O u t (C o lo r) L E D : R e d

C leaning SW

Figure 1-12. Control Panel

Load/E ject SW

1.4.3.1 Switches

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.

Table 1-15. Panel functions in normal state

Switch Function

Load/Eject

(Less than 2

seconds)

Load/Eject

(for 2 seconds)

Cleaning

(for 2 seconds)

Cleaning

(Less than 2

seconds)

Table 1-16. Panel function with turning on

Switch to press when

turning on

Load/Eject

Cleaning

Load/Eject +

Cleaning

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 Sett ing Mode”.

• Load or eject paper

• When the carriage is on the position for exchanging ink cartridge, return it to the home position.

• Start the ink cartridge exchange sequence; i.e. move the carriage to carriage exchange position.

• Start cleaning the print head.

• In the condition of “Ink Low” or “No Ink Cartridge”, start the ink cartridge exchange sequence.

• When the carriage is on the position for exchanging ink cartridge, return it to the home position.

Function

• Start status-printing.*

• Change code pages/Select IEEE1284.4 mode for parallel I/F*

• Start special setting mode.*

Product Description Function 21

EPSON Stylus Photo 750 Revision A

*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]

00 11 01 10

• Print firmware version, ink counter, selected code page and nozzle check pattern

• Start hex-dump printing.

• Start self test printing.

Action

1.4.4 Special Setting Mode

„

CAUTION

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, f ollowing action is carried out.

Unlike the previous models, since this printer does not have EEPROM All Clear function, do not perform this operation except for the purpose of cancelin g 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.

NOTE:*Waste ink counter value and Timer IC counter value are

initialized.

1.4.5 LED Indications

There are 4 LEDs in this printer.

1. Power Lights when the operate switch is “ON”, and AC power is supplied.

2. Paper Out Lights during the paper-out condition, and blinks during the paperjam condition.

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 det ailed LED indicati ons. 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 Function

Load/Eject

Cleaning

(for 10 seconds)

• Initialize EEPROM* and reset time IC.

• Reset the ink overflow counter in EEPROM.

Product Description Function 22

EPSON Stylus Photo 750 Revision A

CAUTION

Table 1-19. Printer Status displayed on the control panel

Indicators

Printer Status

Power on condition On -- -- -- 9

Ink sequence Blink -- -- -- 6

Ink cartridge

exchange mode Data processing Blink -- -- -- 8

Paper out Paper jam

No ink cartridge or

Ink out (black)

Ink level low (black) -- Blink -- -- 7

No ink cartridge or

Ink out (color)

Ink level low (color) -- -- Blink -- 7

EEPROM and

Timer IC reset

Maintenance

Request

Fatal Error

Power

Blink------5

-- -- -- On 4

-- Off Off Blink 3

-- On -- -- 7

-- -- On -- 7

Blink Blink Blink Blink 2

Blink On On Blink 1

Ink Out (Black)

(for 1

second)

Ink Out

(Color)

(for 1

second)

Paper Out Priority

(for 1

second)

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.

1.4.6 Errors

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 s hould not be used agai n. Re-install ation of the cartridge upsets the i nk level d etection and may cause a serious problem to the print head as a result.

Never use or re-install the cartridge, whi ch 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.

Product Description 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 .

„

CAUTION

† 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 enclosu re should be replaced with a new one by a service person. The counter is added by poi nts and it s limit is as follows.

When you need to perform test print after t he repair service, performing the status-printi ng(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.

1.4.7 Initialization

There are 3 types of initialization. † Power-on Initialization

This printer initia lizes 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 initia lizes itself when it is turned off and is turne d 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

„ 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 detecti on, scarcity of lubrication on the carriage shaft etc.

„ Logic operation error

Shorted circuit, etc.

„ Clear the input buffer „ Clear the print buffer „ Set default values

† Soft wa re in it ia li za t ion

“ESC@” command also initializes the printer. On this initialization, following actions are performed.

„ Clear the print buffer „ Set default values

Product Description Function 24

EPSON Stylus Photo 750 Revision A

429

291.97

608.74

167.1

260.9

1.4.8 Initialization Setting

This printer initializes following settings as ini tiali zation sett ing 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.

† Page position: Page heading location as present paper location † Line spacing: 1/6 inch † Right margin position: 80 lines † Left margin position: first line † Character pitch: 10 CPI † Printing mode:Text mode (Not raster graphics mode)

1.4.9 Physical Specification

† Weight: 5.2Kg † Dimensions: 429 mm(W) x 260.9 mm(D) x 167.1 mm (H) (without

sheet support)

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

Consumables

IC1BK02 Ink Cartridge(black) IC5CL02 Ink Cartridge(color)

Product Description Function 26

OPERATING PRINCIPLES

&+$37(5

EPSON Stylus Photo 750 Revision A

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.

P F M o to r

C arriage M echanism (P rint H ead)

CR Motor

op1

Tim ing Belt

Paper Load Trigger

Paper Feed M echanism

H opper D rive M echanism

Pump

Pump Mechanism

Figure 2-1. Printer Mechanism

C arriage Lock M echanism

† 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.

† 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.

„ CR Guide Shaft

Since this guide shaft is ecent ric 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.

† Paper Feed Mechanism

This mechanism consists of Paper Feed Motor(PF Motor), PF Roller, Paper Feed Roller Line and Paper Guides.

† 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.

Operating Principles 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. Usi ng the motive power f rom 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 † C257 PSB Power Supply Circuit † C209 PNL Panel Board

Also, the head drive circ uit is mounted on t he pri nt head. I n thi s se ction, the operating principles of C257PSB board and C259 Main board. The figure below shows the block diagram of the electric 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.

Table 2-1. Output Voltage

Voltage Usage

+42VDC

+5VDC

In this printer, even if the power switch is turned off in the middle of the printing operation, applicati on 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 swi tch 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.

•Motors

• Print Head common voltage

• C259Main Control Circuit Logic

• C209 PNL Panel Board

•Sensors

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

Figure 2-2. Electric Circuit Block Diagram

and is performed with switching operat ion by FET Q1. By t he switchi ng 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 Operating Principles of Electric Circuit 30

EPSON Stylus Photo 750 Revision A

† +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.

† +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 circ uit operation forcefully when the voltage level exceeds +9V.

† +42VDC Line Drop Limitation Circuit:

This protection circuit is in the same line as +42V over voltage protection circuit i s located. The output voltage level of the +42V line is monitored by a Zener diode. This circuit shuts down the circ uit operation forcefully when the voltage levels drops +36V.

† +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

+42 VDC

D51

+5 VDC

IC51

+5V Regulator

ZD81-86,ZD51

+42VDC Line Constant Control

C51

Smoothing Circuit

ZD53

+5VDC Line Over Voltage Limitation

ZD52,87

+42VDC Line Over Voltage Limitation

PSC Signal from Main board

ZD90

+42VDC Lin Drop Limitation Circuit

C84,Q84

Power Drop Delay Circuit

PC1

Photo Coupler

diodes. If the voltage level exceeds +48VDC, this ci rcuit stops circuit

TRANS(T1)

operation forcefully.

C11

Smoothing Circuit

Main Switching Circuit

Q2,Q3,Q31

Abnormal Feed back circuit

† +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

AC Input

Over Current Protection

Filter Circiut

L1,R1-2 C1-C4

Full Wave Rectifier circuit

DB1

line.

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

Printer mechanism is controlled by C259 main board. The figure below shows the block diagram of C259 main control circuit.

CN3 USB

P-ROM (IC3)

D-RAM (IC4)

M-ROM (IC6)

C90A05 (IC1)

CN2 Mac. Serial

Cartridge Sensor

Address

Data

Transceiver (IC9)

Head

CN1 Parallel

Buffer (IC9)

E05B588 (IC2)

Batt1

EEPROM (IC7)

CN5

PE Sensor

CR1

Timer Counter (IC8)

CN4

CN9 HD FFC

Common Driver (IC14)

Reset IC (IC9)

CN11

CN6

Q2&Q3

Motor Driver (IC11)

HP Sensor

CR Motor

PF Motor

CN7

Motor Driver (IC12)

Motor Driver (IC13)

C209 PNL

ASF Sensor

CN8

op04

2.2.2.1 Major Elements

Major elements used in C259 main control circuit board are below.

Table 2-2. Major Elements

IC Location Function

CPU C90A05CA

Gate Array E05B58**

IC1

IC2

PROM IC3

RAM IC4 Bus width 16 bit, 4Mbit DRAM

Mask ROM IC6

AT93C46 IC7

16bit CPU mounted on the c ontrol ci rcuit boa rd is driven by 24MHz clock frequency, and controls the whole printer.

• Motor control

• Head voltage control

• EEPROM control

• Monitoring the sensor

• Monitoring Timer IC

• Mac,Serial I/F, runni ng direction parallel I/F, USB I/F control

Volume 4/8/16MB, Bus width 16 bit EEPROM

• Program or program +CG(k character generator)

64Mbit Mask ROM

•CG

1kBit EEPROM

• Default Setting Valu e

• Back-up of various parameter

RTC-9810SA IC8 Reset/Timer IC

Figure 2-4. Control Circuit Block Diagram

74VHC161284 MEA

IC9 Transceiver IC

SN75LBC777 IC10 RS-422/423 Transceiver LB1847 IC11 CR motor drive iC A3956ALB IC12,13 PF/PUMP Motor drive IC

CXA2099S IC14

Head drive control HIC

• Generating head common voltage

Operating Principles Operating Principles of Electric Circuit 32

EPSON Stylus Photo 750 Revision A

2.2.2.2 Reset Circuit

Reset circuit consists of reset/t imer 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. Als o, IC send s 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

/VDT FRST /RST

10 3 2

29 24 25

/NMI MRES

/RESET VBK GND

CE SCLK DATA

IC 2 E05B588

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 Micr oweave printing is performed.

† ASF Sensor

ASF sensor uses the photo interrupter method. An ASF sensor detects the position of retur n lever when the p ower is t urned on, and causes the paper to be picked up by t he pick up r oller fr o 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.

IC 2 E05B58**

SWA0

SWA1

SWA2

SWC0 SWC1

+5V

ASFV

GND

ASF

HPV

GND

PEV

GND

COB

coc

GND

CN4

ASF

CN5

CN6

CN9

† Black/Color Cartridge Sensor(COB/COC)

Cartridge sensor uses the mechanical method. The sensor detects

CPU

AN0

THM

if the cartridge is installed or not.

op06

Figure 2-6. Sensor Circuit

Operating Principles Operating Principles of Electric Circuit 34

EPSON Stylus Photo 750 Revision A

CXA20996(IC14)

VCC45 Vcc45_2 NPNB FB PNPB

VOUTGND

E05B58**(IC2)

VHCTL

CCO LAT

CLK

BCO

THM

1 2 5

190

SWC0

184

HLAT

IECLK

AN0

105

A0 A1 A2 A3 CLK1 CLK2 /FLOOR /RST DATA DCLK /E

HWA0 HWA1 HWA2 HWA3 HWCLK1 HWCLK2 /HWFLR /HWRST HWSDATA HWSCLK /HWSLAT

SI1

174

HNCHG

+42

18 16

21 20 19

25 24 23

GND2

GND2 GND2 GND2

COM

COM COM COM

VHV

VCC5

SWC1

189

173

NCHG

HCLK

175 176

HSI1

SI2

HSI2

177

SI3

HSI3

178

SI4

179

HSI4

SI5

HSI5

180

SI6

HSI6

181

TMP95C061(IC1)

GND GND

GND GND GND

GND

17 15 13

6 4

CN9

op08

2.2.2.4 Timer 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 judg e 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.

2.2.2.6 Head Drive Ci rcuit

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;

„ Ink Consumption Counter (black/color) „ Frequency of Cleaning „ Destination Data „ CPSI Pass Word „ Other various setting values

+5V

8 6

Figure 2-7. EEPROM Control Circuit

Operating Principles Operating Principles of Electric Circuit 35

AT93C46 (IC7)

Vcc ORG GND

CS SK

1 2 3

206 205 204 203

E05B58** (IC2)

EECS EECK EECO

EECI

op07

Figure 2-8. Common Drive Circuit

EPSON Stylus Photo 750 Revision A

† Driver on the head

The driver on the head is Nozzle-selector drive ci rcuit. 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.

PFIA0

C90A05 (IC1)

E05B58**(IC2)

112

DA1

PFIA1

PFIA2

PFPHAA

PFIB0

PFIB1

PFIB2

PFPHAB

Current Detection

M6252(IC16)

A3956(IC12)

PHASE

REF

PFD

A3956(IC13)

PHASE

REF

PFD

CN8

OUTA OUTB VBB VCC

Rotor

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 contro l.

C90A05 (IC1)

E05B58**(IC2)

111

DA0

193

CRIA0

194

CRIA1

195

CRIA2

196

CRIA3

200

CRIB0

199

CRIB1

198

CRIB2

197

CRIB3

191

CRPHAA

202

CRPHAB

192

CRENBA

201

CRENBB

Current Detection

M6252(IC15)

LB1847(IC11)

IA1

IA2

IA3

IA4

IB1

IB2

IB3

IB4

PHASE1

PHASE2

ENBL1

ENBL2 Vref1 Vref2

CN7

OUTA OUTA-

OUTB OUTB-

7 6

9 8

Rotor

op10

Figure 2-10. Carriage Motor Drive Circuit

Operating Principles Operating Principles of Electric Circuit 37

TROUBLESHOOTING

&+$37(5

EPSON Stylus Photo 750 Revision A

3.1 Overview

This section describes how to identify and troubleshoot the problems when repairing the printer by divi din g the troubl es int o two le vels; r epair and replacement of the assemblies and units, and repair of the components. Refer to the flowchart below and perform repai ring the component after separating the defecti ve units.

START

U nit Level Troubleshooting

Unit Repair (P S B /P S E )

Unit Repair (M ain board)

D isassem ble and A djustm ent

END

Unit Repair

(P rin te r M e c h a n is m )

Table 3-2. Sensor Check Point

Sensor Name Check Point Signal Level Switch Mode

Open (Out of HP range)

Close (Within HP range)

Open (Paper exists)

Open (Paper Feed Roller home position)

Close (Out of home position)

HP Sensor CN4/Pin 1 and 2

PE Sensor CN5/Pin 1 and 2

ASF Sensor CN6/ Pin 1 and 2

Thermistor (THM)

Black cartridge sensor (COB)

Color cartridge sensor (COC)

Head side CN9/ Pin 3 and 4

Head side CN9/ Pin 1 and 4

Head side CN9/ Pin 2 and 4

Less than 0.7V

More than 2.4V

Less than 0.7V

More than 2.4V Close (No paper)

Less than 0.7V

More than 2.4V

Analog signal 10 K (at 24

Open (Cartridge is installed) Close (No Cartridge) Open (Cartridge is installed) Close (No Cartridge)

Figure 3-1.

Troubleshooting Flowchart

Table 3-1. Motor, Coil Resistance

Motor Location Check Point Resistance

CR Motor CN7

PF Motor CN8

Pin 1 and 3 Pin 2 and 4

7.8 Ohms 25

8.8 Ohms ±10% (at 25

10% (at

C/one phase)

Troubleshooting Overview 39

EPSON Stylus Photo 750 Revision A

Table 3-3. Error Indication

LED Indication

Condition

Power

No Paper -- On -- -- Set papers

Paper

Check

Ink End

(Black)

Ink End

(Color)

Remedy

Paper Jam -- Blink Off Off

Ink End / No Cartridge (black)

Ink End / No Cartridge (color)

Ink Low (black) -- -- Blink --

Ink Low (color) -- -- -- Blink

Maintenance Request

Fatal Error Blink Blink On On

-- -- On --

-- -- -- On

Blink Blink Blink Blink

Removed the jammed paper

Close the cartridge cover correctly or replace the ink cartridge with new one.

Replace with a new ink cartridge.

Replace the waste ink pad and reset EEPROM and Timer IC. (See“Special Setting Mode” on page -22)

Turn Off and back On the printer. If it does not recover, repair the related units.

Troubleshooting Overview 40

EPSON Stylus Photo 750 Revision A

Is A C pow er voltage n o rm a l?

YES

Is th e

fuse(F1) of

pow er supply

Is th e

output voltage

of pow er supply

norm al?

Exchange the m ain board.

Input norm al pow er supply.

Exchange the fuse. D isco nn ect C N 1 0 in the m ain board and tu rn th e p o w e r o n again.

YES

C heck output voltage o f C N 2 in th e p o w e r supply board.

Exchange the pow er supply board

C heck the m otor and h e a d . R e fe r to th e repair item of the p r in t e r m e c h a n is m .

START

END

YES

board

opened?

YES

Is th e

fuse opend

again?

3.2 Unit Level Troubleshooting

This section contains the flow char ts which are used to isolate the f aulty 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 thi s, refer to 3.4 Unit Repair and find and replace the defective parts.

Printer does not operate.

Error is detected.

Abnormal printing operation.

Paper Feeding is not performed correctly.

Abnormal Control Panel

Table 3-4. Symptoms and Corresponding Flow Chart

Symptom Cause Flow Chart

• No LED goes ON. 1

• Printer mechanism does not

operate at all.

• LED indicates error.

• Printing is not performed.

• Bad printing quality.

• Abnormal printing.

• Abnormal paper feeding.

• Paper jam occurs.

• Page heading position is not

right.

No responds from the printer, even after pressing switches.

1. Printer does not operate.

Troubleshooting Unit Level Troubleshooting 41

Figure 3-2. Flowchart 1

EPSON Stylus Photo 750 Revision A

2. Error is detected.

START

3. Abnormal printing operation

Figure 3-3. Flowchart 2

Figure 3-4. Flowchart 3

Troubleshooting Unit Level Troubleshooting 42

EPSON Stylus Photo 750 Revision A

START

Is th e

control panel

connected c o rre c tly ?

C onnect the control panel c o rre c tly .

Is th e problem solved?

R eplace the control panel.

Is th e problem solved?

END

R eplace the m ain board.

END

YES

4. Paper feed operation is not performed correctl y

START

paper set in the AS F correctly?

the PF roller

and platen

ro ta te ?

YES

R em ove any obstruction in the paper path if there is any.

C lean the roller of paper path.

Is th e

problem solved?

YES

Set the paper correctly

PF motor running?

YES

R efer to Section 3.5 "R epair of the printer mechanism".

5. Abnormal Control Panel

Is th e

C h e c k th e P F m o to r . If there is no problem , replace the m ain board.

END

Figure 3-5. Flowchart 4

Troubleshooting Unit Level Troubleshooting 43

END

Figure 3-6. Flowchart 5

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 ta ble below provides various symptoms, likel y 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 Table 3-6. Repair of the Power Supply Board

Sympto

The printer does not operate at all.

Condition Cause Check point Solution

+42VDC line does not work.

F1 is open.

Trans T1 is open.

FET(Q1) is broken.

Q2 or Q3 is broken.

Check F1 is normal or not by using a multimeter.

Check T1 is normal or not by using a multimeter.

Check the drain wave.

Check the collector wave.

Replace F1.

Replace T1.

Replace Q1.

Replace Q2 or Q3.

Sympto

The printer does not operate at all.

Condition Cause Check point Solution

Check the output wave(pin 8).

+5VDC line does not work.

IC51(FA36 35A) is broken.

Replace IC51.

PC1 is broken.

Replace PC1.

Troubleshooting Unit Repair (Power Supply Board) 44

EPSON Stylus Photo 750 Revision A

3.4 Repair of the Control Board

Table 3-7. Repair of the Control Board Table 3-8. Repair of the Control Board

Sympto

The printer does not operate at all.

Condition Cause Check point Solution

Check +5VDC line(Pin 7 of IC8) an d reset signal (Pin 2 of IC8).

CPU does not work.

Reset circuit is broken.

ROM is not selected correctly.

RAM is broken.

Check that the waveform of Pin 11 of IC3 reverses High/Low.

Check the signal waveform Pin 88 of IC1.

Replace IC8.

Replace T1.

Replace Q1.

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

Abnormal printing

Condition Cause Check point Solution

Check the signal waveform of DATA(Pin 29) of IC14 and Common NPNB/PNPB(Pin 16/19).

If DATA

IC12 is broken.

IC14 is broken.

is not input, replace IC2.

Replace IC14.

Troubleshooting Repair of the Control Board 46

EPSON Stylus Photo 750 Revision A

3.5 Unit Repair (Printer Mechanism)

This section provides instructio n for repairing mechanism. It describes various problems, symptom, likely causes, checkpoints, and solutions. Select appropriate symptom from the the table and check each part s and its function as describes in the checkpoint.

Table 3-10. Repair of the Printer Mechanism

Symptom Condition Cause Check Point Solution

Manually drive

Abnormal Pump Mechanism

Defective pump absorption.

Abnormal PF motor operation when the power is turned on.

Used ink does not drain to the waste ink pad.

Foreign substances are loaded in the PF gears.

The PF motor is defective.

The pump tube is crashed.

The cap is damaged or deformed.

the PF drive gear and check if it rotates normally.

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)

Check the tube visually.

Remove any foreign objects.

Exchange the PF motor.

Exchange the tube.

Change the cap mechanism.

Table 3-11. Repair of the Printer Mechanism

Symptom Condition Cause Check Point Solution

Abnormal carriage operation.

Carriage operation is abnormal when tuning on the power.

Carriage operation is abnormal during the printing operation.

Foreign substances are loaded in the CR drive gears.

The CR motor is defective.

Carriage movement is not smooth.

Check visuall y if there is any substances or not.

Check the inner coil resistance an d see if there is any disconnection of the coil.

(Table 3-1, “Motor, Coil Resistance,” on page 39)

Manually move the carriage and check if it moves smoothly.

Check the tension of the timing belt.

Check if there is any foreign substances on the carriage path.

Remove any foreign objects.

Exchange the CR motor.

Exchange the tube.

Repair the tension mechanism or replace it.

Remove any foreign objects.

Troubleshooting Unit Repair (Printer Mechanism) 47

EPSON Stylus Photo 750 Revision A

Table 3-12. Repair of the Printing Mechanism Table 3-13. Repair of the Printing Mechanism

Symptom Condition Cause Check Point Solution

Check visually if

Printing is not performed.

Abnormal printing

Carriage moves but no printing is performed.

Only a particula r dot causes abnormal printing.

Head FFC is out of connection.

FFC is disconnected inside.

I/C is defective.

Head Unit is defective.

Print head surface is not clean.

Head unit is defective.

Absorber in the cap is touching the head surface.

the head FFC on the board or carriage is connected firmly.

Check the FFC by using a tester.

Install new I/C and perform the self-test.

If the condition does not improve even after 2 or 3 times of cleaning operation, replace the head unit and perform the self-test.

Check the printing quality after performing the cleaning several times.

Visually check the condit ion of the head absorber.

Connect FFC properly.

Replace the FFC.

Replace I/C.

Replace the head unit.

Perform cleaning.

Replace the head, if the print quality does not recover.

Replace the absorber in the cap if it is deformed.

Symptom Condition Cause Check Point Solution

Abnormal Printing

Sometime printing is not performed.

Black specks or dots.

Print head surface is not clean.

FFC is disconnected inside.

Head FFC is out of connection.

Head Unit is defective.

I/C is defective.

The head FFC is out of connection.

The head unit is defective.

Perform cleaning several times and check the print quality.

Check the FFC by using a tester.

Install new I/C and perform the self-test.

If the condition does not improve even after 2 or 3 times of cleani ng operation, replace the head unit and perform the self-test.

Install the new I/C and perform

self-test. Check if the

head FFC on th e board or carriage is connected surely.

Check connection with the head FFC.

Perform cleaning.

Replace the head FFC.

Connect Head FFC firmly.

Replace the head unit, if it does not recover after performing cleaning.

Replace I/C.

Connect FFC properly.

Replace the head if there is no connection problem with the FFC.

Troubleshooting Unit Repair (Printer Mechanism) 48

EPSON Stylus Photo 750 Revision A

Table 3-14. Repair of the Printer Mechanism Table 3-15. Repair of the Printer Mechanism

Symptom Condition Cause Check Point Solution

Abnormal Printing.

Abnormal Paper Feeding.

A vertical line is not aligned.

White line appears in the imaged data.

Paper is not fed.

Bi-directional alignment is not adjusted.

Head angle is not correct.

Platen gap is not right.

Dot shooting direction is tilted because head surface is not clean.

I/C is defective.

Head unit is defective.

Friction of the PF roller.

Abnormal operation of the hopper.

Perform Bi-D adjustment.

Perform head angle adjustment.

Perform Platen Gap adjustment.

Perform cleaning several times and check the print quality.

Install the new I/C and perform

self-test. Head unit is

broken.

Check if the PF roller rotates when paper is not fed.

Check the movement of the ASF hopper visually.

Refer to Chapter 5 “Adjustment”.

Perform the cleaning operation.

Replace I/C.

Replace the head unit.

Clean the PF roller by the cleaning sheet. Replace the PF roller if it does not recover.

Replace the ASF.

Symptom Condition Cause Check Point Solution

Replace the gears of the ASF drive change-over.

Clean the PF roller by the cleaning sheet. Replace the PF roller if it does not recover.

Replace ASF sensor.

Replace PE sensor.

Connect the head FFC.

Replace the CR motor if there is no problem in the cable connection.

Replace the PF motor if there is no problem in the cable connection.

Abnormal Paper Feeding.

Printer stops during initialization.

Paper is not fed.

Page heading position is wrong.

Fatal error appears.

Malfunction of ASF drive change-over.

Friction of the PF roller.

ASF sensor is defective.

PE sensor is defective.

HP sensor is defective.

Head FFC is disconnected.

CR motor is defective.

PF motor is defective.

Check if the ASF gear rotates visually.

Check if the PF roller slips during the paper feeding.

Check the signal level of the ASF sensor.

Check the signal level of the PE sensor.

Check the signal level of the HP sensor.

Check if the head FFC is connected.

Check the CR motor cable is connected.

Check if the PF motor cable is connected.

Troubleshooting Unit Repair (Printer Mechanism) 49

DISASSEMBLY AND ASSEMBLY

&+$37(5

EPSON Stylus Photo 750 Revision A

CAUTION

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 di sassembly or assembly procedures are described under the head ing “Caut ion”. Any adjustment required after disassembling the units are described under the heading “Required Adjustment”. Also, read precautions below before starting.

4.1.1 Precautions

A lithium battery is installed on the mai n board of this pri nter for back ing up the system clock. Mishandling the battery may cause explosion or short. Read carefully the following precautions.

„

W ARNING

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.

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)

Phillips Screw Driver (No.2)

EPSON B743800200

EPSON B743800400

Nipper EPSON B740500100

CAUTION

Danger of explosion if the battery is incorrectly replaced. Replace only with the same or equivalent type recommended by the manufacture. Dispose of

Tweezers EPSON B741000100 Thickness gage EPSON B776702201

used batteried according to government laws and regulations.

Disassembly and Assembly 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 proper ly and the pr inter is ready to return to the user.

Table 4-2. Check List

Classifi

-cation

Main Unit

Item Check Point Status

Self-test Is the operation normal?

On-line test Is th e printing successful?

Print head

Carriage Mechanism

Paper Feeding Mechanism

Is ink discharged norm ally 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?

• No paper skew?

• No multiple feeding?

• No abnormal noise? Is the PF Motor at correct

temperature? Is the paper path free of all

obstructions?

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

†

Checked

†

Not necessary

†

Table 4-3. Check List

Classifi-

cation

Adjustment

Lubrication Lubrication

Function ROM version Version:

Packing

Other

Item Check Point Status

Specified Adjustment

Ink Cartridge

Protective materials

Attachment, Accessories

Are all the adjustment done correctly?

Are all the lubrication made at the specified points?

Is the amount of lubrication made correctly?

Are the ink cartridge installed correctly?

Have all relevant protective materials been attached to the printer?

Have all relevant items been included in the package?

Checked

†

Not necessary

†

Checked

†

Not necessary

†

Checked

†

Not necessary

†

Checked

†

Not necessary

†

Checked

†

Not necessary

†

Checked

†

Not necessary

†

Checked

†

Not necessary

†

Disassembly and Assembly Overview 52

EPSON Stylus Photo 750 Revision A

4.2 Disassembly

The flowchart below shows step-by step disassembly proced ures.

START

Housing Removal

Board A ssem bly Removal

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 Removal

C artridge Sensor Removal

Print H ead Rem oval

Absorber Tray, A ssem b ly;A R em ova l

Pum p Assembly, Cap A ssem b ly R em o val

Motor, Assembly, CR Removal

Motor Assembly,PF Removal

ASF, Assem bly Removal

C arriage, Assem bly Removal

R o lle r, A s s e m b ly , P F Removal

Sensor, Assem bly, PE Removal

Sensor, HP Rem oval

Paper Feed R oller A ssem b ly, R em ova l

Figure 4-1. Flowchart

R oller, A ssem bly, L D (R /L ) R e m o v a l

Disassembly and Assembly Disassembly 53

EPSON Stylus Photo 750 Revision A

4.2.1 Housing Removal

Since this printer has no lower housing, the pri nter mechanism is exposed just by removing the upper housing.

1. Open the printer cover and set the PG adjust lever on the right-han d side to (+) position.

2. Remove 4 screws and remove the upper housing.

CHECK

PO IN T

CAUTION

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

Refer to “Check Point” and “Adjustment Required” on the next page.

1. Remove the upper housing. (“Housing Removal” on page -54)

2. Remove 5 screws securing the “Printer Mechanism” to the “ Sh iel d plate, M/B”.

[C a b le H o ld e r s ]

5. Fully separate “Shield Plate, M/B” from the printer mechanism.

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.

M A IN B o a rd (C 259 M AIN )

Pow er S upply Board (C257 PSB)

SHIELD PLATE, M /B

Figure 4-3. Shield Plate, M/B Removal

Figure 4-4. C259 Main Removal

3. Slightly pull out the “ Shiel d Plat e, M/B” and re move t he cabl e holder installed on the “Shield Plate, M/B”.

4. Disconnect all the cables from the connector s on the C259 main

NOTE:When removing C257PSB, disconnect cables connected to

the C259 main board.

board.

Disassembly and Assembly Disassembly 55

EPSON Stylus Photo 750 Revision A

CHECK

PO IN T

ADJUSTMENT

REQUIRED

Unlock the connector CN6 and CN7 before disconnecting them. Also, be sure to l ock 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.

CHECK

PO IN T

By removing the control panel, the stacker assembl y 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.

CAUTION

CHECK

PO 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 Revision A

„

CHECK

PO IN T

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

Figure 4-9. “Cap, Assembly” and “Pump Assembly” Removal

move the “Pump Assembly” to left and remove it.

„

CAUTION

Be careful not to damage the rubber part of the ca p.

„

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 Revision A

„

CHECK

PO IN T

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 leaner, H ead

Figure 4-11. Ink Tube

Pum p C om ponents Assem bly O rder

Figure 4-10. Component Parts of “Pump, Assembly”

Disassembly and Assembly Disassembly 62

EPSON Stylus Photo 750 Revision A

ADJUSTMENT

REQUIRED

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 prin ter 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 onpression, S pring, 19.6 P ulley, Assem bly, D riven

Tim ing B elt

O u ts id e s id e fra m e

4. Remove 2 screws securing the motor, and remove “Motor,

Disassembly and Assembly Disassembly 63

Assembly, CR”.

CHECK

PO IN T

When installing “Motor, Assembly, CR”, be sure that 2 projections of the motor br acket are inse rte d to the holes of the frame.

In s id e s id e fra m e

H older, Pulle

Figure 4-12. Timing Belt Removal

, D riv e n

The projections of m otor assem bly m ust lo c a te in s id e th e h o le s

Figure 4-13. Motor, Assembly, CR Removal

After replacing “Motor, Assembly, CR”, perform Bi-D adjustment. (See “Bi-D Adjustment” on

page -86)

EPSON Stylus Photo 750 Revision A

CHECK

PO IN T

4.2.5.4 Motor Assembly PF Removal

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)

3. Remove the following gears which are located at the left side of t he printer mechanism.

„ Gear, 67.2 „ Combination gear, 8.8,21.6 „ Combination gear, 8,14.4 „ Gear, 36

4. Remove the hexagon nut and ”Motor, Assembly, PF”.

„

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”.

Motor, Assembly, PF (behind the fram e)

Cable Direction

C om pression S pring, 0.9

G ear, 67.2

Lock R in g

H exagonal Nut

C om bination G ear, 8, 14.4

C om bination G ear, 8.8, 21.6

G ear, 36

M o to r, A s s e m b ly , P F

Figure 4-15. Motor, Assembly, PF Installation

Put the m otor shaft once in a larger hold then slide it to a sm aller hole

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 shaf t 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.

„

CHECK

PO IN T

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

CAUTION

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 65

Figure 4-16. ASF, Assembly Removal

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)

HO PPER, ASSEM BLY

2. Remove “Torsion Spring,41.2” by unhooking one end from the ASF frame and remove “Lever, Brake”.

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”.

5. Push the “Shaft, Roller, LD” to the l eft 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”.

7. Push out “Shaft, Roller, LD” to the right while lifting up t he right side of “Paper Feed, Roller Assemb ly, Ri ght”, and remove “Shaf t, Roll er, LD” from the left side of “Frame, ASF”.

8. Pull out cam part of “Hopper, Assembly” from the ri ght hole of “ASF, Frame”, holding down the “Upper, Assembly” by hand. From “ASF, Assembly”, left and right “Paper Feed Roller Assembl y” and “Hopper, Assembly” will be separated.

LEVER, BRAKE

Torsion SP R ING , 41.2

C A M part

FRAM E, ASF

BUSH, FIXING , SH AFT, LEFT

LEVER, H OPPER , RELEASE

Paper Feed R oller A ssem bly

BUSH, FIXING , SH AFT

SH A F T, R O LLE R , LD

CHECK

PO IN T

When removing or installing the “Hopper, Assembly”, be careful not to let the grease attach to

Figure 4-17. ASF Disassembly

„

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 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 f rame a nd remove “Cover, Roller, LD” by unhooking it from the assembly frame. Then, remove “Roller Assembly, LD”.

„

CHECK

PO 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)

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.

BUSH, PARALLEL ADJUST, RIG HT

6. Release the hook and remove the “Lever, PG”.

7. Release the hook of “Lever, PG, Sub” and remove “Lever, PG, Sub” and spring washer from the edge of the “Shaft, CR, Guide”.

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”.

Side fram e of printer m echanism

C u t o u t o f s id e fra m e

Figure 4-19. Bush Parallel Adjust Removal

Disassembly and Assembly Disassembly 68

EPSON Stylus Photo 750 Revision A

CHECK

PO IN T

ADJUSTMENT

REQUIRED

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 Revision A

Disassembly and Assembly 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)

3. Remove “PE Sensor Assembly”. (“PE Sensor Assembly Removal” on page -70)

4. Remove 2 screws securing “Guide board, Cable” to the printe r mechanism, then remove “Guide Board, Cable”.

PAPER G UIDE, LEFT

GU IDE PLATE, C ABLE

PAPER G UID E, ASSEM BLY, UPPER

SHAFT, PAPER GU IDE, UPPER

TORSION SPRING, 117.6

(6 pieces)

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.

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”.

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

Figure 4-22. “Paper Guide, Assembly” Removal

support.

Disassembly and Assembly 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”.

„

CHECK

PO IN T

When reinstalling “Paper Guide, Assembly, Upper” at the right edge, be careful not to damage the “PE

Put "R O LLER , ASSEMBLY, PF" through here

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.

RO LLER, ASSEMBLY, PF

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.

SENSO R , HP

CR MOTOR

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

Figure 4-26. Bush Holder, Sensor, I/C Removal

2. Remove “Harness, I/C” from the clamp part of the carriage.

Bush Holder, Sensor, I/C

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.

Carriage Assembly

Engaging Hole

Engaging part

Engaging Holes

of inside hook

Outside Hook

Inside Hook

Outside Hoo

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 connec tion.

„

CHECK

PO 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

ADJUSTMENT

&+$37(5

EPSON Stylus Photo 750 Revision A

Note)

5.1 Overview

“O”: Required Adjustment.

“NA”: Not applicable.

This section describes th e procedure for adjustments requi red when the printer is disassembled and assembled for repair.

5.1.1 Required Adjustment

Table 5-1 lists all the necessary adjustment s 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 operat ion of the printer.

Table 5-1. Required Adjustment

Performance Priority

Service/ Replacing parts

Replacing the printer mechanism

Replacing the C209 Main Board

Replacing the print head unit.

Replacing the CR Motor.

Replacing or disassembling the carriage assembly.

Replacing or disassembling the Roller Assembly.

1 2 3 4 5

Paper Gap Adjustme nt

NA O O NA O

NA O O O O

NA O O O NA

NA NA NA NA O

ONANAO O

O NA NA NA NA

In Charge VH Setting

Head

Angular

Adjustme

Bi-D

Adjustme

Adjustment Overview 77

EPSON Stylus Photo 750 Revision A

CHECK

PO IN T

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 duri ng assembling and get the standard distance from the surface of the printing head to the paper surface.

„

CAUTION

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

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”)

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.

CAUTION

Do not use the same thickness gauge you used for Stylus Photo and Stylus Photo 700.

4. Move the carriage to the position that the print head overlaps the thickness gauge.

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)

Figure 5-1. Paper Gap Adjustment

„

Leave the thickness gauge on the flat si de of the ri b of the front paper guide;B.

„

When you move the carriage, move it , pulling the timing belt with your hand.

Adjustment 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.

Position M ark

Backw ard (G ap: N arrow er)

Side Fram e

"BUSH, PARALLEL ADJUST, RIGHT"

"LEVER, PG "

Forward (G ap: W ider)

Figure 5-2. Paper Gap Adjustment

7. Perform the same procedures above (from 1 to 6) to the “Bush, Parallel, Adjus tment, Left”.

† Check the Gap

After completing the adjustment to “Bush, Paral lel, 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

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 cor rect i nfo rmation to the main board, using the exclusive adjustment program.

5.3.1 Adjustment Program

This adjustment program(Sp750.EXE) consists of the menu to inpu t the model name and main menu for adjustments.

„

CAUTION

5.3.1.1 How to use the Adjustment Program

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.

Prompt-SP750

Auto

adj1

5. After setting the model name, program goes to the destination menu.

Prom pt-SP750

Auto

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 t he 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.

adj2

Adjustment Adjustment by Adjustment Program 80

EPSON Stylus Photo 750 Revision A

6. Select “World” .

Main menu

Prompt-SP750

Auto

ESC Key

Return Key

adj3

7. Select “Perform”, if “Printer is not rea dy” message is not indicated.

After this screen, menu screen will appear. Each function on the main menu can be executed by ESC and ENTER keys.

Adjustm ent

M arket/D estination C heck

H e a d V o lta g e ID In p u t

H ead A ngular Adjustm ent

Bi-D Adjustm ent

M aintenance

H ead C leaning(C L2)

Ink C harge F lag R eset

Transportation Liquid Charge

Protection C ounter value

Figure 5-3. Options in the Program and Keys to Use

A4 Check P a tte rn

Adjustment Adjustment by Adjustment Program 81

EPSON Stylus Photo 750 Revision A

5.3.2 Setting Destination Information

1. Select “Adjustment” on the main menu and press Return key. Program goes to the adjustment menu.

Prom pt-ST 750

Auto

Prom pt-SP750

Auto

adj

Prom pt-SP750

Auto

adj4

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.

adj6

Adjustment Adjustment by Adjustment Program 82

EPSON Stylus Photo 750 Revision A

5.3.3 Head Voltage ID Adjustment

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.

1. Select “Adjustment” on the main menu and press Return key. Program goes to the adjustment menu.

Prompt-SP750

Auto

Prom pt-SP750

Auto

adj9

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: On the side face of the print head. „ Printer mechanism: On the label of the packing box of the printer

2. Select “Head Actuator Voltage ID Input” and press Return key. Following screen appears.

adj

5. After completing the Head ID input, press ESC key until the screen returns to the adjustment menu.

mechanism.

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

Carriage Assembly

Screw for

fixing the print head

5.3.4 Head Angular Adjustment

During production, slight variat ions 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.

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.

Prom pt-SP750

Auto

Figure 5-4. Screw position for fixing the print head

Prompt-SP750

Auto

adj11

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 84

adj12

EPSON Stylus Photo 750 Revision A

5. Refer to the printing pattern, and adj ust th e head angle by us ing t he adjustment lever.

T o m o v e th is d o w n ,

m o v e th e le v e r to th e

C orrect condition = evenly spaced

T o m o v e th is u p ,

m ove th e lever to th e le ft (fro n t).

Adjustm ent Lever

rig h t (re a r).

aj11

Figure 5-5. Lever Operation and Corresponding Change in Pattern

6. Head angular pattern is printed, every time the adj ustment lever is moved.

7. Repeat Step 4 to 6 until the angle becomes normal.

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.

„

CHECK

PO 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 lef t directions during the Bi-directional printi ng. The value adjusted in this section will be stored as Bi-D corrected value in the EEPROM on the control board.

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.

Prom pt-SP750

Auto

4. Refer to the Pattern Sample and see if all the lines ar e 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)

Figure 5-6. Bi-D Adjustment Pattern Sample

adj13

7. Repeat Step 3 to 6 until Bi-D pattern become correct.

3. Select “Print the Bi-D Adjustment Pattern”, and press Return key twice. 3 Bi-D patterns of the current sett ing value and +/-2 levels ar e printed at variable dot and normal dot.

8. To finish the adjustment, press ESC key until the adjustment menu appears.

Adjustment Adjustment by Adjustment Program 86

EPSON Stylus Photo 750 Revision A

CAUTION

5.3.6 Head Cleaning

In this function, t he same cleaning as t he one from the cont rol panel can be performed from the adjustment program. With this sequ ence, you can forcibly solve the clogged nozzle problem caused by viscous ink.

1. Select “Maintenance” on the Main Menu and press Return key.

2. Select “Head Cleaning” and press Return key.

Prom pt-S P750 Prom pt-S P750

Auto

Prompt-SP750

Auto

adj16

3. Cleaning Mode Selection Menu appears. Again, press Return key, then, cleaning will be performed.

Adjustment Adjustment by Adjustment Program 87

adj1

4. After the cleaning is completed, press ESC key until the screen returns to the Maintenance Menu.

„

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.

EPSON Stylus Photo 750 Revision A

CAUTION

5.3.7 Initial Ink Charge

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. Perf orm initial ink charge at the following cases.

„ 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”.

Prom pt-SP750

Auto

Prom pt-SP750

Auto

adj18

3. If you wish to perform the initial ink charge, press Return key. If not, press ESC key.

„

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 i nk, do not perform unnecessarily.

It takes about 2 minutes to complete the initial ink charge.

adj1

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.

Auto

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.

4. If the counter value exceeds the limit, replace the waste ink pad(absorber) and reset the protect counter.

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 “P rotect Counter Check/Clear Menu”.

3. Select “Clear the protect counter value” and press Return key.

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 Adjustment by Adjustment Program 89

MAINTENANCE

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EPSON Stylus Photo 750 Revision A

6.1 Overview

This section describes the points and procedures for maintaining the printer in its optimum condition.

6.1.1 Cleaning

This printer has no mechanical components which requir e regul ar cleaning. Therefore, note that poi nts suggested be low are onl y to check for dirt, and perform appropriate cleaning if necessary.

„

CAUTION

† Ex te ri o r p ar ts

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.

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.

6.1.2 Service Maintenance

If the print irregularity miss ing, white line, etc.) has occurred or the printer indicates “Maintenance Request Error”, take the following actions to clear the error.

† Head Cleaning

The printer has a built-in head cleaning funct ion 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 cleanin g sequence, and head cleaning is performed.

† Maintenance Request Error

Ink is used for the operation such as cleaning as well as printi ng. 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 “Cl eaning” 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

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.

„

CAUTION

Type Name EPSON Code Supplier

Grease G-26 B702600001 EPSON

Oil 0-12 1038991 EPSON

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.

Table 6-1. Specified Lubricants

Table 6-2. Lubrication Point

No. Lubrication Type/Point Remarks

• Contact between “Roller, PF2 and

“Paper Guide, Rear”. <Lubrication Type> G-26 <Lubrication Amount>

• A half turn of “Roller, PF” <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” <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. <Lubrication Point>

• “Gear 67.2.”

• *Combination Gear, 16,21.6”

• “Gear, 23.2” <Lubrication Type> G-26

• Apply grease while rotating “Gear, 67.2”.

• Do not attach the grease to the paper path.

• Use a syringe to apply it.

• 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.

• After lubrication, make sure that the carriage moves smoothly.

• Use a syringe to apply it.

• Rotate gears after applying grease to evenly distribute it.

• Use a syringe to apply it.

Maintenance Overview 92

EPSON Stylus Photo 750 Revision A

Table 6-3. Lubrication Point Table 6-4. Lubrication Point

No. Lubrication Type/Point Remarks

• 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”

<Lubrication Point> The shaft for “Gear, 16, 40.8” on

“Frame, Left”.

<Lubrication Type> G-26 <Lubrication Amount> Approximately 5 mm

• 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

• Both Left/Right Bushings for

“Roller, Exit”

• Evenly apply inside the bushings.

• Contact points between “Holder, Pulley Driven” and “Frame, Upper”

• 2 mm long for each point.

• Rotate gears after applying grease to evenly distribute it.

• Use a syringe to apply it.

• For the right bushing, apply it from the paper path side, and wipe off any sticki ng o ut to the cap assembly side.

• Rotate “Roller, PF” after applying grease to evenly distribute it in the bushing.

• Use a syringe to apply it.

• Do not attach the grease to the paper path.

• Use a syringe to apply it.

• Apply that the holder slides only with spring force after applying grease.

• Use a syringe to apply it.

No. Lubrication Type/Point Remarks

• ASF; The round hole in the right frame of A SF (to hold the roller

shaft)

<Lubrication Type> G-26 <Lubrication Amount> Evenly apply inside the hole.

<Lubrication Point> ASF; Contact points between “Hopp er”

and “Lever, Hopper, Release”. <Lubrication Type> G-26 <Lubrication Amount> Evenly apply lubrication to the points.

<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.

<Lubrication Point> Oil pad in the carriage assembly. <Lubrication Type> O-12 <Lubrication Amount>

0.7cc

Note:

This is the amount to b e appl ied

to a new oil pad.

• Avoid applying grease to “Roller, Assembly, LD”

• Completely wipe off any grease sticking out to the inner side of ASF.

Lubricate the oil pad only when; *Replacing the carriage assembly. *Replacing the oil pad Use a precise syringe to app ly it. If

you accidentally apply too muc h 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.

Maintenance Overview 93

EPSON Stylus Photo 750 Revision A

Maintenance Overview 94

EPSON Stylus Photo 750 Revision A

"HOLDER, PULLEY, DRIVEN"

*N ever apply the oil exceeding 0.6cc.

No.12

(O il pad)

C arriage A ssem bly

No.8

"HO PPER, ASSEM BLY"

(b o tto m v ie w )

No.10

"FRAM E, ASF"

No.9

"S H A F T , C R , G U ID E "

Maintenance Overview 95

Epson 750 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual