Epson Stylus 760 Service Manual

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SERVICE MANUAL

Color ink jet printer

EPSON Stylus COLOR 760

SEIJ99004

EPSON Stylus COLOR 760 Revision C

Notice:

electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SEIKO EPSON CORPORATION.

n The contents of this manual are subject to change witho ut notice. n 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.

n The above not withstanding SEIKO EPSON CORPORATION can assume no responsibility for any errors in this manual or the conse quences

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.

EPSON Stylus COLOR 760 Revision C

PRECAUTIONS

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

DANGER Signals a precaution which, if ignored, could result in serious or fatal personal injury. Great caution should be exercised in

performing procedures preceded by DANGER Headings. WARNING Signals a precaution which, if ignored, could result in damage to equipment. The precautionary measures itemized below should always be observed when performing repair/maintenance procedures .

DANGER

1. ALWAYS DISCONNECT THE PRODUCT FROM THE POWER SOURCE AND PERIPHERAL DEVICES PERFORMING ANY MAINTENANCE

OR REPAIR PROCEDURES.

2. NOWORK SHOULD BE PERFORMED ON THE UNIT BY PERSONS UNFAMILIAR WITH BASIC SAFETY MEASURES AS DICTATED FOR

ALL ELECTRONICS TECHNICIANS IN THEIR LINE OF WORK.

3. WHEN PERFORMING TESTING AS DICTATED WITHIN THIS MANUAL, DO NOT CONNECT THE UNIT TO A POWER SOURCE UNTIL

INSTRUCTED TO DO SO. WHEN THE POWER SUPPLY CABLE MUST BE CONNECTED, USE EXTREME CAUTION IN WORKING ON POWER SUPPLY AND OTHER ELECTRONIC COMPONENTS.

WARNING

1. REPAIRS ON EPSON PRODUCT SHOULD BE PERFORMED ONLY BY AN EPSON CERTIFIED REPAIR TECHNICIAN.

2. MAKE CERTAIN THAT THE SOURCE VOLTAGES IS THE SAME AS THE RATED VOLTAGE, LISTED ON THE SERIAL NUMBER/RATING

PLATE. IF THE EPSON PRODUCT HAS A PRIMARY AC RATING DIFFERENT FROM AVAILABLE POWER SOURCE, DO NOT CONNECT IT TO THE POWER SOURCE.

3. ALWAYS VERIFY THAT THE EPSON PRODUCT HAS BEEN DISCONNECTED FROM THE POWER SOURCE BEFORE REMOVING OR

REPLACING PRINTED CIRCUIT BOARDS AND/OR INDIVIDUAL CHIPS.

4. IN ORDER TO PROTECT SENSITIVE MICROPROCESSORS AND CIRCUITRY, USE STATIC DISCHARGE EQUIPMENT, SUCH AS ANTI-

STATIC WRIST STRAPS, WHEN ACCESSING INTERNAL COMPONENTS.

5. REPLACE MALFUNCTIONING COMPONENTS ONLY WITH THOSE COMPONENTS BY THE MANUFACTURE; INTRODUCTION OF

SECOND-SOURCE ICs OR OTHER NONAPPROVED COMPONENTS MAY DAMAGE THE PRODUCT AND VOID ANY APPLICABLE EPSON WARRANTY.

EPSON Stylus COLOR 760 Revision C

PREFACE

This manual describes basic functions, theory of electrical and mechanical operations, maintenance and repair procedures of the EPSON Stylus COLOR 760. The instructions and procedures included herein ar e int ended for the experienced repair technicians, and attention should be given to the precautions on the preceding page. The chapters are organi zed as follows:

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 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:

• EEPROM Address Map

• Connector Pin Assignments

• C298MAIN Board Component Layout

• Parts List and Explode Diagrams

• C298MAIN Board Circuit Diagram

EPSON Stylus COLOR 760 Revision C

Revision Status

Revision Issued Date Description

A August 17, 1999 First Release

B October 5, 1999

C November 25,1999

Second release Change has been made due to overall review of the manual.

Third Release Change has been made due to overall review of the manual.

• Some T.B.D have been made clear.

• Appendix has additional information.

- Fig7-3, 7-4 has been mounted.

EPSON Stylus COLOR 760 Revision C

PRODUCT DESCRIPTION

FEATURES .................................... ...... ....... ...... ....... ...... ....... ...... ....... ........... 7

SPECIFICATIONS ...................................... ...... ....... ...... ....... ...... ....... ...... ..... 8

Physical Specification ........................................................................................... 8

Printing Specification ........................................................................................... 8

Paper Feeding ....................................................................................................... 8

Input Data Buffer ................................................ ..... ........................................ ..... 8

Electric Specification ............................................................................................ 9

Environmental Condition .................................................................................... 10

Reliability ........................................................................................................... 10

Safety Approvals .................................................................................. ..... ......... 10

Acoustic Noise .................................................................................................... 10

CE Marking ........................................................................................................ 10

INTERFACE ............................................................................................... 11

Parallel Interface (Forward Channel) ................................................................. 11

Parallel Interface (Reserve Channel) .................................................................. 14

USB Interface ..................................................................................................... 15

Preventing Data Transfer Time-out of Hosts ............................................. ...... ... 16

Interface Selection .............................................................................................. 16

IEEE1284.4 Protocol .......................................................................................... 16

OPERATOR CONTROLS ........................................................................... 17

Operating Switch ................................................................................................ 17

Control Panel ...................................................................................................... 17

Switches .......................................................................................................... 17

Indicators ........................................................................................................ 17

Panel Functions ................................................................................................... 18

Printer Condition and Panel Status ................................ ...... ............................... 19

Printer Initialization ............................................................................................ 19

Errors .................................................................................................................. 20

PAPER ......................................................................................................... 21

Paper Handling ................................................................................................... 21

Paper Specification ............................................................................................. 21

Cut Sheet ........................................................................................................ 21

Transparency, Glossy Paper ........................................................................... 21

Envelope ......................................................................................................... 21

Index Card ...................................................................................................... 21

Printing Area ....................................................................................................... 22

Cut Sheet ........................................................................................................ 22

Envelopes ....................................................................................................... 23

INK CARTRIDGE ....................................................................................... 24

Black Ink Cartridge ............................................................................................ 24

Color Ink Cartridge ............................................................................................. 24

Operating Principles

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

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

Printing Mechanism ....................................................................................... 29

Printing Process .............................................................................................. 30

Carriage Mechanism .............................. ..... ...... ........................................ ..... 31

Platen Gap (PG) Adjust Mechanism .............................................................. 32

Paper Feeding Mechanism ............................................................................. 32

CR Lock Mechanism ...................................................................................... 34

Paper Loading Mechanism ............................................................................. 35

Pump Mechanism ........................................................................................... 37

Capping Mechanism ....................................................................................... 39

Electrical Circuit Operating Principles ......................................................... 40

C298PSB/PSE Board .......................................................................................... 41

C298MAIN Board .............................................................................................. 43

Printhead Driver Circuit ................................................................................. 45

Reset Circuit ................................................................................................... 46

CR Motor Driver Circuit ................................................................................ 47

PF Motor Driver Circuit ............................................... .................................. 49

EEPROM Control Circuit .............................................................................. 50

Sensor Circuit ........................................................................... ..... ................. 51

Troubleshooting

Overview ...................................................................................................... 54

Troubleshooting with LED Error Indications ..................................................... 55

Remedies for Paper Out Error ........................................................................ 57

Remedies for the Paper Jam Error .................................................................. 59

Remedies for No I/C and Ink Out Errors ....................................................... 60

Remedies for the Maintenance Error ............................................................. 62

Remedies for Fatal Error ................................................................................ 63

Isolating the Faulty Part on the Power Supply Board ........................................ 65

Isolating the Faulty Part according to the Phenomenon ..................................... 67

EPSON Stylus COLOR 760 Revision C

Disassembly and Assembly

Overview ...................................................................................................... 73

Precautions for Disassembling the Printer .......................................................... 73

Tools ................................................................................................................... 74

Screw Specifications ........................................................................................... 75

Service Checks After Repair ......................................... ...... ..... .......................... 76

Disassembly Procedures ............................................................................... 77

Removing the Upper Housing ............................................................................ 78

Removing the Circuit Board Assembly .............................................................. 79

Removing the Operation Panel ........................................................................... 81

Disassembling the Printer Mechanism ............................................................... 82

Removing the Printhead Unit ......................................................................... 83

Removing the Waste Ink Absorber Tray Assembly ....................................... 85

Removing the Ink System Assembly ............................................................. 87

Removing the CR Motor Assembly ............................................................... 90

Removing the ASF Assembly ........................................................................ 91

Removing the Paper Feed Roller Assembly............................................................. 93

Removing the Right and Left LD Roller Assembly..................................................97

Removing the CR Assembly .......................................................................... 98

Disassembling the CR Assembly............................................................................ 101

Removing the PF Roller & Paper Eject Roller Assy. ................................... 103

Remove the PF Motor Assembly ................................................................. 107

Removing the PE Detector Assembly .......................................................... 108

Adjustment

Overview .................................................................................................... 110

Required Adjustments ...................................................................................... 110

Adjustment Tools Required .............................................................................. 111

Adjustment ................................................................................................ 112

Parallelism Adjustment ............................................................. ...... .................. 112

Backlash value Adjustment for PF motor ......................................................... 115

Adjustment by Adjustment Program ................................................................ 118

About Adjustment Program .......................................................................... 118

How to set up the program ........................................................................... 118

Select the Model Name ................................................................................ 119

Market Destination Check ............................................................................ 120

Head Voltage ID Input ................................................................................. 121

Head Angular Adjustment ............................................................................ 123

Bi-D Adjustment .......................................................................................... 126

USB ID input ................................................................................................ 129

Initial Ink Charge Operation ........................................................................ 133

Head Cleaning Operation ............................................................................. 134

Protection Counter Check/Reset .................................................................. 135

Recovery for the clogged nozzle .................................................................. 137

Print A4 pattern ............................................................................................ 138

PF Loop scale unit assembling procedure ................................................... 139

Assembling the PF Loop scale unit .................................................................. 139

Sticking the PF Loop scale unit to Gear 76 ...................................................... 141

Maintenance

Overview .................................................................................................... 143

Cleaning ............................................................................................................ 143

Service Maintenance ......................................................................................... 143

Lubrication ........................................................................................................ 144

Appendix

Connector Summary .................................................................................. 153

Connector Pin Assignment ............................................................................... 153

EEPROM ADDRESS MAP ............................................................................. 156

Circuit Board Component Layouts ............................................................. 161

Exploded Diagram ..................................................................................... 164

Parts List ................................................................................................... 169

Circuit Diagrams ........................................................................................ 172

PRODUCT DESCRIPTION

CHAPTER

EPSON Stylus COLOR 760 Revision C

1.1 FEATURES

The major features of EPSON color inkjet printer Stylus COLOR 760 are:

o High Color Print Quality

n 1440 (H) X 720 (V) dpi printing n Four Color Printing (YMCK) n Traditional and New Microweave

o Built-in Auto Sheet Feeder

n Holds 100 cut-sheets (64g/m n Holds 10 envelopes n Holds 30 transparency films

o Two Built-in Interfaces

n Bi-directional parallel I/F (IEEE-1284 level 1 device) n USB

o Windows/Macintosh exclusive

)

PRODUCT DESCRIPTION FEATURES 9

EPSON Stylus COLOR 760 Revision C

1.2 SPECIFICATIONS

This section covers specifications of the printer.

1.2.1 Physical Specification

o Weight: 6.0kg (excluding ink cartridges) o Dimension:

Storage: 450 mm (W) x 269 mm (D) x 175 mm (H) Printing: 450 mm (W) x 628 mm (D) x 303 mm (H)

1.2.2 Printing Specification

o Print Method

n On demand ink jet

o Nozzle Configuration

n Monochrome 144 nozzles (48 x 3 staggered) n Color 48 nozzles x 3 (Cyan, Magenta, Yellow)

o Print Direction

n Bi-direction with logic seeking

o Print Speed & Printable Columns

Table 1-1. Character Mode

Character Pitch Printable Column LQ Speed

10 CPI (Pica) 80 238 CPS*

*This value is the speed of normal-dot printing.

o Control Code

n ESC/P Raster command n EPSON Remote command

o Character Tables

n Two international character sets:

- PC 437 (US, Standard Europe)

- PC 850 (Multilingual)

o Typeface

n Bit map LQ font:

EPSON Courier 10 CPI

1.2.3 Paper Feeding

o Feed Method

n Friction feed with ASF

o Paper Path

n Cut-sheet ASF (Top entry, Front out)

o Feed Speed

n 2.36 inch/sec (Normal, Continuous feed) n 4.5 inch/sec (Fast, Continues feed)

1.2.4 Input Data Buffer

n 256KB

Table 1-2. Raster Graphics Mode

Horizontal Resolution Printable Area Available Dot CR Speed

180 dpi 8.26 inches 1488 23.8/19 IPS 360 dpi 8.26 inches 2976 2 3.8 /19 IPS 720 dpi 8.26 inches 5952 19 IPS

PRODUCT DESCRIPTION SPECIFICATIONS 10

EPSON Stylus COLOR 760 Revision C

1.2.5 Electric Specification

[120V Version]

Rated Voltage: AC120V Input Voltage Range: AC99∼132V Rated Frequency Range: 50∼ 60Hz Input Frequency Range: 49.5∼ 60.5Hz Rated Current: 0.4A Power Consumption: Approx. 18W (ISO10561 Letter Pattern)

Approx. 3.5W in standby mode Energy Star compliant

Insulation Resistance: 10M ohms min.

(between AC line and chassis, DC 500V)

Dielectric Strength: AC 1000V rms. 1 minutes or

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

[220 ∼ 240V Version]

Rated Voltage: AC220V∼240V Input Voltage Range: AC198∼264V Rated Frequency Range: 50∼60Hz Input Frequency Range: 49.5∼60.5Hz Rated Current: 0.2 A Power Consumption: Approx. 18W (ISO10561 Letter Pattern)

Approx. 3.5W in standby mode Energy Star compliant

Insulation Resistance: 10M ohms min.

(between AC line and chassis, DC 500V)

Dielectric Strength: AC 1500V rms. 1 minute

(between AC line and chassis)

PRODUCT DESCRIPTION SPECIFICATIONS 11

EPSON Stylus COLOR 760 Revision C

1.2.6 Environmental Condition

o Temperature

n Operating: 10 to 35 °C (see the figure below for condition) n Non-operating: -20 to 60 °C (with shipment container)

1 month at 40

o Humidity

n Operating: 20 to 80% RH

(without condensation / see the figure below for condition)

n Non-operating: 5 to 85% RH

(without condensation / with shipment container)

o Resistance to Shock

n Operating: 1G, within 1 ms n Non-operating: 2G, within 2 ms (with shipment container)

o Resistance to Vibration

n Operating: 0.15G n Non-operating: 0.50G (with shipment container)

80 70 60

Humidity (%)

50 40 30 20

C and 120 hours at 60 °C

Temperature (°C)

1.2.7 Reliability

Total Print Volume: 75,000 pages (A4, Letter) Print Head Life: 3 billion dots/nozzle

1.2.8 Safety Approvals

[120V Version]

Safety Standards: UL1950

CSA22.2 No.950

EMI: FCC part 15 subpart B Class B

CSA C108.8 Class B

[220∼240V Version]

Safety Standards: EN60950 (VDE) EMI: EN55022 (CISPR Pub.22) Class B

AS/NZS 3548 Class B

1.2.9 Acoustic Noise

Level: Approx. 42dB(A)(According to ISO 7779)

-Used media : Plain Paper

- Print Quality: Fine

1.2.10 CE Marking

[220∼240V 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

Figure 1-1. Temperature / Humidity of Range

PRODUCT DESCRIPTION SPECIFICATIONS 12

EPSON Stylus COLOR 760 Revision C

1.3 INTERFACE

This printer provides USB and parallel interface as standard.

1.3.1 Parallel Interface (Forward Channel)

Transmission Mode: 8 bit 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 held high until all these signals return to their inactive state.

BUSY signal is at high level in the following cases:

n During data entry (see data transmission timing) n When input data buffer is full n During -INIT signal is at low level or during hardware initialization n During printer error (see -ERROR signal) n When the parallel interface is not selected

ERROR signal is at low level when the printer is in one of the following states:

n Printer hardware error (fatal error) n Paper-out error n Paper-jam error n Ink-out error

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

DATA

-STROBE

tsetup

BUSY

tready

-ACKNLG

data byte n

thold

tbusy

tstb

treply

tack

tnbusy

Figure 1-2. Data Transmission Timing

Table 1-3.

Parameter Minimum Maximum

tsetup 500ns -

thold 500ns -

tstb 500ns -

tready 0 -

tbusy - 500ns

tt-out* - 120ns

tt-in** - 200ns treply 0 -

tack 500ns 10us

tnbusy 0 -

data byte n+1

tnext

tnext 0 -

* Rise and fall time of every output signal. ** Rise and fall time of every input signal. *** Typical timing for tack is shown on the following page.

PRODUCT DESCRIPTION INTERFACE 13

EPSON Stylus COLOR 760 Revision C

Table 1-4. Typical Time of tack

Parallel I/F Mode Typical Time of tack

High Speed 1us

Normal Speed 3us

Table 1-5. Signal Level: TTL Compatibl e (IEEE-1284 level 1 device)

Parameter Minimum Maximum Condition

VOH* - 5.5V

VOL* -0.5V -

IOH* - 0.32mA VOH = 2.4V

IOL* - 12mA VOL = 0.4V

CO - 50pF

VIH - 2.0V

VIL 0.8V -

IIH - 0.32mA VIH = 2.0V

IIL - 12mA VIL = 0.8V CI - 50pF

* A low logic level on the Logic H signal is 2.0V or less when the printer is

powered off, and this signal is equal to or exceeding 3.0V when the printer is powered on. The receiver shall provide an impedance equivalent to 7.5K ohm to ground.

Table 1-6. Connector Pin Assignment and Signals

Pin No.

1 -STROBE 19 In

2 DATA0 20 In 3 DATA1 21 In 4 DATA2 22 In 5 DATA3 23 In 6 DATA4 24 In 7 DATA5 25 In 8 DATA6 26 In 9 DATA7 27 In

10 -ACKNLG 28 Out

11 BUSY 29 Out

12 PE 28 Out

13 SLCT 28 Out

Signal

Name

Return

GND Pin

In/Out Functional Descri ption

The strobe pulse. Read-in of data is performed at the falling edge of this pulse.

The DATA0 through DATA7 signals represent data bits 0 to 7, respectively.

Each signal is at high lev el when data is logical 1 and low le vel whe n data is logical 0.

This signal is a negative pulse indicating that the printer can accept data again.

A high signal indic ates that the printer cannot receive data.

A high signal indicates paper-out error.

Always at high level when the printer is powered on.

14 -AFXT 30 In Not used.

The falling edge of a negative pulse

31 -INIT 30 In

32 -ERROR 29 Out

36 -SLIN 30 In Not used.

or a low signa l on this l ine c auses the printer to initialize. Minimum 50us pulse is necessary.

A low signal indicates printer error condition.

PRODUCT DESCRIPTION INTERFACE 14

EPSON Stylus COLOR 760 Revision C

Table 1-6. Connector Pin Assignment and Signals (continued)

Pin No.

18 Logic H - Out

35 +5V - Out

16,33,

19-30 15,34 NC - - Not connected

Signal

Name

Chassis

GND

GND - - Signal GND

Return

GND Pin

- - Chassis GND

In/Out Functional Description

Pulled up to +5V via 3.9K ohm resistor.

Pulled up to +5V via 3.3K ohm resistor.

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

of view.

PRODUCT DESCRIPTION INTERFACE 15

EPSON Stylus COLOR 760 Revision C

1.3.2 Parallel Interface (Reserve Channel)

Transmission Mode: IEEE-1284 nibble mode Adaptable Connector See forward channel. 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: IEEE-1284 level 1 device

See forward channel.

Table 1-7. Connector Pin Assignment and Signals

Pin No.

1 HostClk 19 In Host clock signal. 2 DATA0 20 In 3 DATA1 21 In 4 DATA2 22 In 5 DATA3 23 In 6 DATA4 24 In 7 DATA5 25 In 8 DATA6 26 In 9 DATA7 27 In

10 PtrClk 28 Out Printer clock signal.

Signal

Name

PtrBusy /

DataBit-3,7

Return

GND Pin

29 Out

In/Out Functional Description

The DATA0 through DATA7 signals represent data bits 0 to 7, respectively.

Each 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.

Printer busy signal and reverse channel transfer data bit 3 or 7.

Table 1-7. Connector Pin Assignment and Signals (continued)

Pin No.

36 1284-Active 30 In 1284 active signal.

18 Logic-H - Out

35 +5V - Out

16,33,

19-30 15,34 NC - - Not connected

Note) In/Out refers to the direction of signal flow from the printer’s point of view.

Signal

Name

-DataAvail / DataBit-0,4

Chassis

GND

GND - - Signal GND

Extensibility Request:

The printer responds affirmatively when the extensibility request values are 00H or 04H, which means,

00H: Request Nibble Mode Reverse Channel Transfer. 04H: Request Device ID;

Return Data Using Nibble Mode Rev Channel Transfer.

Return

GND Pin

29 Out

- - Chassis GND

In/Out Functional Description

Data available signal and reverse channel transfer data bit 0 or 4.

Pulled up to +5V via 3.9K ohm resistor.

Pulled up to +5V via 3.3K ohm resistor.

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

AckDataReq / DataBit-2,6

Xflag /

DataBit-1,5

28 Out

Acknowledge data request signal and reverse channel tran sfer data bit 2 or 6.

X-flag signal and reverse channel transfer data bit 1 or 5.

PRODUCT DESCRIPTION INTERFACE 16

EPSON Stylus COLOR 760 Revision C

Device ID:

The printer sends the following device ID string when it is requested.

When IEEE1284.4 is enabled,

[00H] [5AH] MFG: EPSON; CMD: ESCPL2, BDC, D4; MDL: Stylus[SP]COLOR[SP]760; CLS: PRINTER; DES: EPSON[SP]Stylus[SP]COLOR[SP]760;

When IEEE1284.4 is disabled,

[00H] [57H] MFG: EPSON; CMD: ESCPL2, BDC; MDL: Stylus[SP]COLOR[SP]760; CLS: PRINTER; DES: EPSON[SP]Stylus[SP]COLOR[SP]760;

NOTE 1:[00H] denotes a hexadecimal value of zero. NOTE 2:MDL value depends on the EEPROM setting. NOTE 3:CMD value depends on the IEEE1284.4 setting.

1.3.3 USB Interface

Standard: Based on:

“Universal Serial Bus Specifications Rev. 1.0” “Universal Serial Bus Device Class Definition

for Printing Devices Version 1.0” Bit Rate: 12Mbps (Full Speed Device) Data Encoding: NRZI Adaptable Connector: USB Series B Recommended Cable Length: 2 meters

Table 1-8. Connector Pin Assignment and Signals

Pin No. Signal Name I/O Function Description

1VCC -

2 -Data Bi-D Data

3+DataBi-D

4 Ground - Cable ground

Pin #2

Cable power. Max. power consumption is 2mA.

Data, pull up to +3.3 V via 1.5K ohm resistor.

Pin #1

Pin #3

Pin #4

Figure 1-3. USB Pin Assignment

PRODUCT DESCRIPTION INTERFACE 17

EPSON Stylus COLOR 760 Revision C

1.3.4 Preventing Data Transfer Time-out of Hosts

Generally, hosts abandon data transfer to peripherals when a peripheral is in the busy state for dozens of seconds continuously. To prevent this kind of timeout, the printer receives data very slowly, several bytes per minute, even if the printer is in the busy state. The slowdown starts when the remaining input buffer becomes several hundreds of bytes. Finally, the printer gets into the busy state continuousl y when the input buffe r is full. USB and IEEE1284.4 on the parallel interface do not require this function.

1.3.5 Interface Selection

The printer has two built-in interfaces: the USB and parallel interface. These interfaces are selected automatically.

o Automatic Selection

In this automatic interface selection mode, the printer is initialized to the idle state scanning which interface receives data when it is powered on. Then the interface that received data first is selected. When the host stops data transfer and the printer is in the stand-by state for seconds, the printer is returned to the idle state. As long as the host sends data or the printer interface is in the busy state, the selected interface is let as it is.

o Interface State and Interface Selection

When the parallel interface is not selected, the interface gets into the busy state. When the printer is initialized or returned to the idle state, the parallel interface gets into the ready state. Note that the interrupt signal such as the

-INIT signal on the parallel interface is not effective while that interface is not selected.

o Automatic Selection

An initial state is compatible interface and starts IEEE1284.4 communication when magic strings (1284.4 synchronous commands) are received.

o On

An initial state is IEEE1284.4 communication and data that received it by the time it is able to take synchronization by magic string (1284.4 synchronous commands) is discarded.

o Off

An initial state is compatible interface and never starts IEEE1284.4 communication even if magic strings (1284.4 synchronous commands) are received.

1.3.6 IEEE1284.4 Protocol

The packet protocol described by IEEE1284.4 standard allows a device to carry on multiple exchanges or conversations which contain data and/or control information with another device at the same time across a single point-to-point link. The protocol is not, however, a device control language. It does provide basic transport-level flow control and multiplexing services. The multiplexed logical channels are independent of each other and blocking of one has no effect on the others. The protocol operates over IEEE1284.

PRODUCT DESCRIPTION INTERFACE 18

EPSON Stylus COLOR 760 Revision C

1.4 OPERATOR CONTROLS

1.4.1 Operating Switch

Operating switch is located on the control panel.

1.4.2 Control Panel

1.4.2.1 Switches

There are two non-lock type push switches, one lock-type push switch, and four LED lights.

Load/Eject

Cleaning

Power

1.4.2.2 Indicators

(1) Power

Lights when the operating switch is “ON” and AC power is supplied.

(2) Paper Out

Lights during the paper-out condition, and blinks during the paper-jam 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.

Figure 1-4. Control Panel

PRODUCT DESCRIPTION OPERATOR CONTROLS 19

4 2

EPSON Stylus COLOR 760 Revision C

1.4.3 Panel Functions

Table 1-9. Panel Functions

Switch Function

Load / Eject

(Push for less than 2 sec.*)

Load / Eject

(Push for 2 sec.*)

Cleaning

(Push for 2 sec.*)

Cleaning

(Push for less than 2 sec.*)

* It is described in the user’s manual that three seconds are required. **This function is not available in printing status.

• Loads or ejects a paper.

• When the carriage is on the ink cartridge replacement position, return the carriage to the capping position.

• Starts the ink cartridge replacement se quence.**

• Moves the carriage to the cartridge replacement position.

• Starts cleaning of the printhead.

• In the condition of “In k Low”, “Ink Out” , or “No I nk Cartridge ”, starts the ink cartridge replacement sequence.**

• When the carriage is on the ink cartridge replacement position, return the carriage to the capping position.

Table 1-10. Panel Function with Power On

Switch Pressing with Power On Function

Load / Eject

Cleaning

Load/Eject

Cleaning

*1: One of the following actions is carried out according to the content of 1BH of EEPROM.

Content of 1BH of

EEPROM, [bit7] [bit6]

00 11 01 Start hex-dump printing. 10 Start self test printing.

*2: Not described in the user’s manual. *3: See the table below.

• 1) Starts status printing. *1

• Changes code pages / Select IEEE1284.4 mode for parallel I/F. *2

• Enters the special settings mode. (Factory use only). *3

Action

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

Table 1-11. Special Setting Mode

Switch Function

Load / Eject

Cleaning

(Push for 10 seconds)

• Initialize EEPROM and reset timer IC.

• Reset the ink overflow counter in EEPROM.

PRODUCT DESCRIPTION OPERATOR CONTROLS 20

EPSON Stylus COLOR 760 Revision C

1.4.4 Printer Condition and Panel Status 1.4.5 Printer Initialization

Table 1-12. Printer Condition and LED Status

Indicators

Printer Status

Power On Condition On - - - 9 Ink Sequence Blink - - - 6 Ink Cartridge

Replacement Mode Data Processing Blink - - - 8 Paper Out - - - On 4 Paper Jam Condition - Off Off Blink 3 No Ink Cartridge /

Ink End (Black) Ink Level Low (Black) - Blink - - 7 No Ink Cartridge or

Ink End (Color) Ink Level Low (Color) - - Blink - 7 Enter EEPROM and

Timer IC Reset Maintenance

Request Fatal Error Blink On On Blink 1

Power

Blink - - - 5

-On- -7

--On-7

- ON (for 1 second only) -

Blink Blink Blink Blink 2

Ink Out

(Black)

Ink Out

(Color)

Paper Out

Priority

There are three kinds of initialization methods, and the following explains each initialization.

1. Power-on Initialization This printer is initialized when turning the pri nte r power on, or prin ter recognized the cold-reset command (remote RS command).

When printer is initialized, the following actions are performed: (a) Initializes printer mechanism. (b) Clears input data buffer. (c) Clears print buffer. (d) Sets default values.

2. Operator Initialization This printer is initialized when turning the printer power on again within 10 seconds from last power off, or printer recognized the -INIT signal (negative pulse) of parallel interfac e.

When printer is initialized, the following actions are performed: (a) Cap the printer head. (b) Eject a paper. (c) Clears input data buffer. (d) Clears print buffer. (e) Sets default values.

3. Software Initialization The ESC@ command also initializ e the printer.

When printer is initialized, the following actions are performed: (a) Clears print buffer. (b) Sets default values.

PRODUCT DESCRIPTION OPERATOR CONTROLS 21

EPSON Stylus COLOR 760 Revision C

1.4.6 Errors

o Ink Out

When the printer runs out most of the ink of any color, it warns ink-low and keeps printing. When the printer runs out the whole ink of any color, it stops printing and indicates ink-out error. User is requested to install a new ink-cartridge in this state. An ink-cartridge that has been taken out once should never be used again. Re-installation of the cartridge not filled fully upsets the ink level detection and may cause a serious problem in the print head as a result.

o Paper Out

When the printer fails to load a sheet, it goes into a paper out error.

o Paper Jam

When the printer fails to eject a sheet, it goes into a paper jam error.

o No Ink-Cartridge

When the printer detects that ink-cartridge comes off, it goes into this error mode.

o Maintenance Request

When the total amount of ink wasted through the cleanings and flushing reaches to the limit, printer indicates this error and stops. The absorber in the printer enclosure needs to be replaced with new one by service personnel.

o Fatal Errors

Carriage control error or CG access error.

PRODUCT DESCRIPTION OPERATOR CONTROLS 22

EPSON Stylus COLOR 760 Revision C

1.5 PAPER

1.5.1 Paper Handling

Do not perform reverse feed more than 9.5mm (0.38”).

1.5.2 Paper Specification

1.5.2.1 Cut Sheet

[Size]

A4: Width 210mm (8.3”) x Length 297mm (11.7”) Letter: Width 216mm (8.5”) x Length 279mm (11.0”) B5: Width 182mm (7.2”) x Length 257mm (10.1”) Legal: Width 216mm (8.5”) x Length 356mm (14.0”) Statement: Width 139.7mm (5.5”) x Length 215.9mm (8.5”) Executive: Width 184.2mm (7.25”) x Length 266.7mm (10.5”) Photo Paper: Width 101.6mm (4”) x Length 152.4mm (6”)

[Thickness]

0.08mm (0.003”) - 0.11mm (0.004”)

[Weight]

64g/m

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

[Thickness]

0.075mm (0.003”) - 0.085mm (0.0033”)

*Transparency printing is available only at normal temperature.

1.5.2.3 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”) - 0.52mm (0.02”)

[Weight]

45g/m2 (12Ib.) - 75g/m2 (20Ib.)

[Quality]

Bond paper, Plain paper, Air mail

*Envelope printing is available only at normal temperature. *Keep the longer side of the envelope horizontally at setting.

[Quality]

Exclusive paper, Bond paper, PPC

1.5.2.2 Transparency, Glossy Paper

[Size]

A4: Width 210mm (8.3”) x Length 297mm (11.7”)

1.5.2.4 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”) 5 x 8” Index Card: Width 127mm (5.0” x Length 203mm (8.0”) 10 x 8” Index Card: Width 127mm (5.0”) x Length 203mm (8.0”)

Letter: Width 216mm (8.5”) x Length 279mm (11.0”)

[Thickness]

Less than 0.23mm (0.0091”)

PRODUCT DESCRIPTION PAPER 23

EPSON Stylus COLOR 760 Revision C

1.5.3 Printing Area

1.5.3.1 Cut Sheet

See the figure below and tables on the right for printable areas for Raster Graphics mode and Character mode.

Printable Area

Figure 1-5. Printable Area for Cut Sheet

Table 1-13. Character Mode

Paper

Size

A4 3mm (0.12”) 3mm (0.12”) 3mm (0.12”)

Letter 3mm (0.12”) 9mm (0.35”) 3mm (0.12”)

B5 3mm (0.12”) 3 m (0.12”) 3mm (0.12”)

Legal 3mm (0.12”) 9mm (0.35”) 3mm (0.12”)

Statement 3mm (0.12”) 3mm (0.12”) 3mm (0.12”)

Executive 3mm (0.12”) 3mm (0.12”) 3mm (0.12”)

NOTE: Refer to 1.5.2 Paper Specification for PW (paper width) and PL

Left Margin

(min.)

(paper length).

Right Margin

(min.)

Top Margin

(min.)

Bottom Margin

(min.)

14mm (0.54”) /3mm (0.12”)*

14 mm (0.54”) / 3mm (0.12”)*

Table 1-14. Raster Graphics Mode

Paper

Size

A4 3 mm (0.12”) 3 mm (0.12”) 3 mm (0.12”)

Letter 3 mm (0.12”) 3 mm (0.12”) 3 mm (0.12”)

B5 3 mm (0.12”) 3 mm (0.12”) 3 mm (0.12”)

Legal 3 mm (0.12”) 3 mm (0.12”) 3 mm (0.12”)

Statement 3 mm (0.12”) 3 mm (0.12”) 3 mm (0.12”)

Exclusive 3 mm (0.12”) 3 mm (0.12”) 3 mm (0.12”)

Left Margin

(min.)

Right Margin

(min.)

Top Margin

(min.)

Bottom Margin

(min.)

14 mm (0.54”) / 3mm (0.12”)*

* Bottom margin is reduced to 3mm when paper dimension is defined by using the

command. However, pr int i n th e ex tra prin tab le a rea m ay sc ram bl e. No te th e bo ttom margin remains 14 mm without the command.

PRODUCT DESCRIPTION PAPER 24

EPSON Stylus COLOR 760 Revision C

1.5.3.2 Envelopes

Printable Area

Figure 1-6. Printable Area for Envelopes

Table 1-15. Envelope Margin

Size

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

Left Margin

(min.)

Right Margin

(min.)

Top Margin

(min.)

Bottom Margin

(min.)

DL 3 mm (0.12”) 7 mm (0.28”) 3 mm (0.12”) 14 mm (0.55”) C6 3 mm (0.12”) 3 mm (0.12”) 3 mm (0.12”) 14 mm (0.55”)

PRODUCT DESCRIPTION PAPER 25

EPSON Stylus COLOR 760 Revision C

1.6 INK CARTRIDGE

1.6.1 Black Ink Cartridge

Type: Exclusive Cartridge Color: Black Print Capacity: 900 pages/A4

(ISO/IEC 10561 Letter Pattern at 360 dpi) Ink Life: 2 years from date of production Storage Temperature:

Storage: -20 Packing: -30 Transit: -30

Dimension: 27.8 mm (W) x 52.7 mm (D) x 38.5 mm (H)

C to 40 oC (within a month at 40 oC)

C to 60 oC (within 120 hours at 60 oC

and within a month at 40

27.8

52.7

51.2

1.6.2 Color Ink Cartridge

Type: Exclusive Cartridge Color: Magenta, Cyan, Yellow Print Capacity: 300 pages / A4 (360 dpi, 5% duty each color) Ink Life: 2 years from date of production Storage Temperature:

Storage: -20 Packing: -30 Transit: -30

Dimension: 42.9 mm (W) x 52.7 mm (D) x 38.5 mm (H)

C to 40 oC (within a month at 40 oC)

C to 60 oC (within 120 hours at 60 oC

and within a month at 40

52.7

42.9

43.2

38.5

51.2

38.5

41.4

Figure 1-8. Color Ink Cartridge

26.3

Figure 1-7. Black Ink Cartridge

Note 1: Ink cartridge can not be re-filled. It is prepared only for an article of

consumption. Note 2: Do not use the ink cartridge which contains life-expired ink. Note 3: Ink will be frozen under -4

placing it at room temperature for more than three hours.

°C environment; however, it will be usable after

PRODUCT DESCRIPTION INK CARTRIDGE 26

OPERATING PRINCIPLES

CHAPTER

EPSON Stylus COLOR 760 Revision C

2.1 Overview

This section describes the operating principles of the printer mechanism and electrical circuit boards. The EPSON Stylus COLOR 760 has the following boards:

Main board: C298MAIN Board

Power supply board: C298PSB/PSE Board

Panel board: C298PNL Board

2.1.1 Printer Mechanism

Unlike other EPSON ink jet printers, the power source. Use of the DC motor enable the printer to lower noise during printing to a great extent. Table 2-1 shows the various motor types used in the printer and their applications.

Table 2-1. Motor Types and Corresponding Applications

Stylus COLOR 760

uses DC motor for

The basic structure of the printer mechanism is mostly common to the Stylus COLOR 400/600/440/640/740, except that the Stylus COLOR 760 uses a DC motor.

Figure 2-1 shows the printer mechanism block diagram for the Stylus COLOR

760.

Intermittent Gear

PF Motor Pinion

PF Motor

Flashing Window (80th column)

Star Wheel roller

Loop Scale

PF Drive Gear (high precision)

ASF Sensor

Detector Wheel

Loading Shaft

Photo Interrupter

(Encoder)

Motor Name Type Application / Feature

Used to drive the carriag e maki ng littl e noise . A

CR Motor DC with brush

PF Motor DC with brush

a linear scale is used to monitor the motor’s operating condition.

• Drives paper feeding rollers used to send paper at specified speeds and load/eject paper.

• Drive the ASF used to send paper to PF roller.

• Drive CR Lock le ver When the CR unit is in the home position, the CR lock lever is fixed the CR unit.

• Drive Pump Unit to absorb the ink

To monitor paper feeding pitch, a loop scale is attached beside the high-precision gear.

Bk I/C Sensor

CMY I/C Sensor

Carriage Unit

Printhead (one unit)

Timing Belt

Cap Unit (without a valve)

Pump Unit

CR Guide Shaft

PF Roller

Loading Rollers

PE Sensor

Liner Scale

CR Motor (DC motor)

PG Lever

Figure 2-1. Printer Mechanism Block Diagram

Operating Principles Overview 28

EPSON Stylus COLOR 760 Revision C

2.1.1.1 P rinting Mechanism

The basic operating principles of the printhead, which plays a major role in printing, are the same as previous models; ones that use a on-demand type UCHIP head method. (Refer to Figure1-1.) Also, unlike the Stylus Color IIs, 820 and 200, the Stylus COLOR 760 is not an automatic correction type. So, in order to correct dispersion of multi layer piezo electric element that drives each nozzle, you are required to input a VH value written on the top surface of the printhead by using an exclusive program when you replace the printhead, control board, or printer mechanism. (Note there are no resistor arrays to determine the VH voltage on the main control board.) Following explains printhead .

o PZT

PZT is an abbreviation of Piezo Electric Element. Print signals from the Main board are sent through the driver board on the printhead unit to the PZT. Then, the PZT pushes the top cavity whic h has ink sto red to discharge the ink from each nozzle on the nozzle plate.

o Cavity Set

The ink absorbed from the ink cartridge goes through the filter and then is stored temporarily in this tank called “cavity” until PZT is driven.

I/C Sensor Actuator

Nozzle Plate

PZT

Nozzle Selector Board

Ink Cartridge

Needle

Filter

Cavity

o Nozzle Plate

Figure 2-2. Printing Mechanism

The board with nozzle holes on the printhead surface is called Nozzle Plate.

o Filter

When the ink cartridge is installed, if any dirt or dust around the cartridge needle is absorbed into the head, there is a great possibility of causing nozzle clog and disturbance of ink flow, and finally causing alignment failure and dot missing. To prevent this problem, a filter is set below the cartridge needle, where ink is filtered.

Operating Principles Overview 29

EPSON Stylus COLOR 760 Revision C

2.1.1.2 P rinting Pro cess

Figure 2-3 and Figure 2-4 show the normal state and ejecting state of the printhead, respectively.

1. Normal State: When the print signal is not output, PTZ also does not move from a waiting state (normal state). (Refer to Figure 2-3.)

2) Ejecting Stat e: When the print signal is output from the C298MAIN board, IC (IR4C463S: Nozzle Selector) located on the printhead unit latches data once by 1-byte unit. An appropriate PZT latched by the nozzle selector is pushed into the cavity by the common voltage applied from the main board. By this operation, ink stored in the cavity spurts out from nozzles. (Refer to Figure 2-4.)

Ink Course Cavity

Figure 2-3. Print Head Normal State

PZT

Nozzle

Nozzle Plate

Figure 2-4. Print Head Ejecting State

Operating Principles Overview 30

EPSON Stylus COLOR 760 Revision C

2.1.1.3 Carria ge Mechanism

The carriage mechanism for the Stylus COLOR 760 is mostly the same as for other ink jet printers except it is driven by a DC motor. See the table below for the carriage motor specifications.

Table 2-2. Carriage Motor Specification

Items Specifications

Type DC Motor with brush Drive Voltage +42 V +/- 5%(DRV IC voltage) Internal Resistance 29.2 ohms +/- 25% Inductance 30.8 mH +/- 25% Drive Method Constant Current Chopping Driver IC LB1947

Unlike a stepping motor, the DC motor that drives the carriage can not detect the current carriage position by referring to the pulses given. Therefore, a linear scale is attached along the carriage operation range to enable the printer to mechanically detect the carriage position. (Same as the Stylus COLOR 900) The linear scale is also used to produce the print timing signal (PTS signal), to which the printer refers to for a correct ink ejection timing. For detailed information on the CR motor control circuit, see Section 2.2.

The printhead, a core of the printing mechanism, is stored in the carriage unit. When the adjustment lever is moved up and down, this printhead is maintained tilt in a flexible and adjustable structure by the tilt adjustment mechanism. Also, the parallelism adjustment levers, mounted on the left and right sides of the carriage guide shaft, are used to set the carriage guide shaft parallel to the platen when the shaft has been installed to the printer mechanism. After this adjustment is completed, moving the PG adjustment lever sets the distance between the platen surface and the printhead surface to one of two possibilities: 1.14 mm or 1.84mm. You can change the distance by rotating the shafts of the carriage guide shaft which itself is decentralized, with the operation of PG lever. This is the mechanism that the user can use to adjust the appropriate PG value according to the printing result or any other environmental conditions such as paper thickness.

Timing Belt

PF Roller

Liner Scale for

CR motor

CR unit

Figure 2-5. Carriage Mechanism (Top view)

Operating Principles Overview 31

EPSON Stylus COLOR 760 Revision C

2.1.1.4 Platen Gap (PG) Adjust Mechanism

The PG adjustment, at the right of the printer mechanism, consists of the PG lever, PG support lever, right/left parallelism adjustment levers, and CR guide shaft. The PG adjustment mechanism is designed to keep the platen gap correct for the paper thickness to prevent ink from smearing. The PG support lever joins the CR guide shaft, which has and eccentricity via PG support lever. Switching the lever from “0” to “+” rotates the CR shaft and changes the platen gap from narrow to wide.

Table 2-3. Platen Gap Adjust Lever Setting

Paper Lever Position PG adjustment value

All Media Front

If you find any print problems or you use thick paper

Rear

0 mm (1.14mm between head and platen)

0.7mm (1.84mm between head and platen)

2.1.1.5 Paper Feeding Mechanism

The paper feeding mechanism transports paper loaded from ASF using the PF rollers and paper eject rollers. A new type of DC motor is used for the PF motor. See the table below for the DC motor specifications.

Table 2-4. PF Motor Specifications

Item Description

Motor type DC Motor with Brush Drive voltage +42V +/- 5% (DRV IC voltage) Coil Resistance 31.1 ohm +/- 25% Drive frequency [Hz] 26.6mH +/- 25% Control method A3958

Unlike a stepping motor, the DC motor that drives the paper feeding mechanism can not measure the paper feeding amount by referring to the pulses given. For this reason, the loop scale and encoder sensor are directly attached to the left end of the PF roller shaft to mechanically control paper feed amount. See Section 2.2 for detailed information on the PF motor control circuit.

Drive from the PF motor is sent to the PF rollers and paper eject rollers as described below.

o To the PF rollers:

PF motor pinion gear (CCW rotation)

→ Spur gear (76) → PF rollers

o To the eject rollers:

PF motor pinion gear (CCW rotation) (13.5, 308)

NOTE: Above CCW rotation is mentioned viewing from the PF motor pinion gear

side.

→ Spur gear (28) → Paper eject rollers

Figure 2-6 in the next page gives the paper feeding mechanism block diagram, showing the parts along the PF motor drive transmission paths.

→ Spur gear (76) → Combination gear

Operating Principles Overview 32

EPSON Stylus COLOR 760 Revision C

Loop Scale

Spur Gear 76

Spur Gear 28

Combination Gear13.5,30.8

Paper Eject Roller

PF motor

PF Roller

Star Wheel Assy.

Figure 2-6. Paper Feeding Mechanism (Top View)

The printer loads paper at the ASF, which is detected by the PE sensor attached to the right side of the top frame, and advances it to send the paper’s leading edge to the halfway of the front paper guide. Then, to correct deflection, the printer feeds the paper back specified steps toward ASF, and advances the paper again toward the front paper guide and stops it at the specified TOF (Top Of Form) position. Once the printer starts printing, it transports paper using the PF rollers and sub rollers, and as the printer transports or printing on the tailing 14 mm, it uses a star wheel gear and paper eject rollers. Like the Stylus COLOR 440/640/740, this printer also provides this extra printable range of 14 mm from the bottom edge, excluding the bottom margin of 3mm, by changing the position of the star wheel gear; it has been shifted by 5 this change, the tailing edge of paper is suppressed, and the printer can advance paper steadily when printing around the bottom area. See Figure 2-7 next page that shows how paper is transported and parts involved.

° from the top of the eject roller toward the front paper guide. Due to

[Previous Models]

Star Wheel Assy.

Paper

Eject Roller

Printhead

Platen

Support Roller

Bottom margin 3 mm touch es

the printhead surface.

PF Roller

[Stylus COLOR 760]

Five Degrees

Steady

Figure 2-7. Paper Transportation (Right side view)

Operating Principles Overview 33

EPSON Stylus COLOR 760 Revision C

2.1.1.6 CR Lock Mechanism

The carriage lock mechanism prevents the carriage from being left at an uncapped position for a long time, that is usually caused by vibration during printer transportation, user’s mishandling of the printer, and so on. The CR Lock mechanism is driven with the DC PF motor. As for the motor specifications, refer to Table 2-4. The PF motor drive is us ed for the Paper Feed Mechanism also and the CR lock mechanism is controlled depending on the direction of the PF motor rotation. The CR lock mechanism is assembled on the right tip of the Paper Eject Roller as shown in the following figure.

Top view

Bushing 6

Paper Eject Roller

Middle Frame

Pump Planetary Lever

CR Lock lever

Pump Planetary

Lever Fixing Guide

Figure 2-8. CR Lock mechanism

Right side view

CR Unit

If the carriage is left uncapped for a long time, ink on its surface will become gradually thick and not spurt from the nozzles as a result. To make matters worse, the holes (crater) of the nozzles may be completely clogged by the thick ink, and they may not be able to return to a normal condition just by a cleaning operation. To prevent this, the printer enters a carriage lock condition in the following conditions.

o After Power-off operation:

If the printer power is turned off in the middle of printing or any other performances, carriage lock takes place in the end after an initialization operation.

o After Power-on operation:

After the printer power is turned on and an automatic power-on cleaning is completed, carriage lock is performed. The power-on cleaning is an automatic head cleaning that runs when the printer power is turned on. The timer IC always calculates printer’s power off time using power from a lithium battery mounted on the C298MAIN board. The power-on cleaning function automatically selects a correct cleaning level according to the length of time which the printer has been turned off.

o After ejecting paper:

After the Load/Eject button is pressed and the paper is ejected, if the printer does not receive any data, it performs carriage lock and goes to a standby state. However, if paper is loaded by pressing the Load/Eject button, the printer does not perform the ca rria ge loc k opera tio n.

PF motor torque is always transmitted to the CR lock lever side, but the operation of the CR lock mechanism varies depending on the rotational direction of the PF motor, as shown in the following below.

Table 2-5. CR Lock mechanism & PF motor rotational direction

While the PF motor drive is used for paper feeding (PF motor rotation: CCW), the CR Lock lever is set under the Paper Eject Frame. But the CR Lock lever rises up with the CW rotation of the PF motor and locks the CR unit. Drive from the PF motor is sent to the CR Lock lever via Paper Eject Roller

Counterclockwise Clockwise

Directions Corresponding Functions

• Releases th e CR lock lever.

• Sets the CR lock lever.

below.

o To the CR lock lever

PF motor pinion gear (CW rotation) (13.5, 30.8)

→ Spur gear (28) → Paper eject rollers→ CR lock lever.

→ Spur gear (76) → Combination gear

Operating Principles Overview 34

EPSON Stylus COLOR 760 Revision C

2.1.1.7 Paper Loading Mechanism

The paper loading mechanism loads paper at the ASF unit and feeds paper to the PF rollers. The ASF unit, the same as in the Stylus COLOR 440/640/740, uses a DC PF motor. Drive sent from this motor is switched between the ASF unit side and Pump/PF roller side by the disengage mechanism.

Drive from the PF motor is transmitted to the ASF as described below:

o Drive transmission to the ASF unit

1) When the C R unit mov e s to the left end of the C R shaft, the DE lever is

pushed to the left end and the Spur gear 26.4 meshes with the Combination gear (16,40.8).

2) Drive of the PF motor is sent to the ASF side.

3) Drive from the PF motor is transmitted as described below.

PF Motor pinion gear → Spur gear (76) → Spur gear (26.4) → Combination gear (16,40.8) ASF

Figure 2-9 shows the disengage mechanism and the parts involved.

Spur Gear 27.2

→ Spur gear (23.2) → Spur gear (27.2) in

Spur Gear 23.2

When the PF motor torque is switched to the ASF unit side by the disengage mechanism, the function of the ASF mechanism varies depending on the rotational direction of the PF motor, as shown in the table below.

Table 2-6. ASF unit function & PF Motor rotational direction

Directions Corresponding Functions

Counterclockwise

Clockwise

• Picks up paper

• Resets paper to the correct paper set position using the Return Lever.

Combination Gear 16,40.8

Spur Gear 76

Spur Gear 26.4

PF Roller

DE lever

Figure 2-9. Disengage Mechanism (Top view)

Operating Principles Overview 35

EPSON Stylus COLOR 760 Revision C

1. When the printer power is turned on, the PFmotor rotates counterclockwise

Torque sent from the PF motor to the ASF unit via the disengage mechanism is used for the following operation.

o Paper loading operation

Like the Stylus COLOR 440/640/740, ASF of this printer has the multiple paper

loading prevention mechanism to provide steady paper loading. This mechanism prevents a sheet of paper from falling from the paper set position into the paper path. A paper return lever in the mechanism pushes paper that may have fallen off back onto the hopper. After this motion is completed, the LD roller starts loading paper. The paper loading mechanism, including the multiple paper loading prevention mechanism, is described in the following steps.

NOTE: If no print signal is sent for several seconds in step 4, the LD roller and the

to detect ASF home position. Then the motor rotates clockwise specified steps to set the LD roller and paper turn lever in place. (See “Standby State” in Figure 2-10.)

2. When the paper loading signal is sent from the PC and the Load/Eject button is pressed, PF motor turns counterclockwise to let the LD roller load paper. (See “Paper Pick Up State” in Figure 2-10.)

3. When the paper is transported to the PF roller, the LD roller stops where it loses friction. (See “PF Roller Paper Feed State” in Figure 2-10.)

4. When the next print signal is sent or Load/Eject button is pressed, the PF motor rotates clockwise specified steps to set the LD roller and the paper return lever in place. (See “Standby State” in Figure 2-10.)

paper return lever automatically return to the standby state.

LD Roller

Paper Return

Lever

Hopper Hopper Sprin g

Cam

Pad Spring

Pad

[Stand-by State]

[Paper Pickup State]

Pinch Roller

[PF Roller Paper Load State]

Figure 2-10. Multiple Paper Loading Prevention Mechanism (right side view)

Operating Principles Overview 36

EPSON Stylus COLOR 760 Revision C

2.1.1.8 Pump Mechanism

The pump mechanism absorbs ink from the printhead or the cap assembly. The wiper for head cleaning is attached in the cap assembly. The pump mechanism is driven by the DC PF motor. Drive sent from this motor is switched between CR lock lever mechanism (PF roller & Paper Eject Roller) side and Pump unit side by the Pump disengage mechanism. See Table 2-4 for the PF motor specifications. Torque from the PF motor is sent to the pump unit by the switching operation of the planetary gear in the Pump disengage mechanism. The PF motor torque is transmitted to the pump mechanism as described below.

o Torque transmission to the pump unit

1)When the CR unit moves to capping position, the protusion of the CR unit pushes the Pump planetary lever fixing guide to the right side and release the Pump planetary lever. (Pump planetary lever is fixed with the Pump planetary lever fixing guide to the CR lock lever mechanism side.)

2)The PF motor rotates to counterclockwise direction and the Paper eject roller rotates to paper eject direction. The Pump planetary lever also rotates about 90 degree angle to the Pump mechanism side.

3)Torque from the PF motor is transmitted as described below. PF motor pinion gear (CCW rotation) (13.5, 30.8)

→

Spur Gear 10.4 (Pump DE unit) → Spur Gear 8.4 (Pump DE unit) →

Combination Gear 12, 28.8.

→

Spur gear (28) → Paper eject rollers → Pump planetary lever

→

Figure 2-11 shows you torque transmission to the Pump unit.

Spur Gear 76

Combination Gear

13.5, 30.8 Paper Eject Roller

PF Motor

→

Spur gear (76) → Combination gear

Pump un it.

Pump disenga g e mechanism

Figure 2-11 show you the pump disengagement mechanism.

Top view

Middle Frame

CR lock Lever

Pump planetary lever

Pump planetary lever fixing guide

Tension sp r in g

Spur Gear 10.4

Spur Gear 8.4

CR lock lever is set under the Paper Eject roller Frame.

Printhead pushes the Planetary lever fixing guide to the right side and releases the Pump planetary lever.

The Pump planetary lever rotates 90 degree angl and the Spur gear 8.4 engages with the Combination gear12,

28.8.

Right side view

Combination Gear 12, 28.8

Spur gear 28

CR Lock lever

Figure 2-11. Torque transmission to Pump Unit (Top view)

Pump Unit

Figure 2-12. Pump disengagement mechanism

Operating Principles Overview 37

EPSON Stylus COLOR 760 Revision C

When the PF motor torque is switched to the pump unit side by the disengage mechanism, the function of the pump mechanism varies depending on the rotational direction of the motor, as shown in the table below.

Table 2-7. Pump unit Functions & PF motor rotational direction

Directions Corresponding Functions

Counterclockwise

Clockwise

Figure 2-13 shows the operating principles of the pump mechanism.

• Ink absorption by the pump

•Sets the wiper.

• Releases t he pump.

• Resets the wiper.

Counterclockwise

Tube pressured

Figure 2-13. Pump Mechanism

Clockwis

Tube released

Operating Principles Overview 38

EPSON Stylus COLOR 760 Revision C

2.1.1.9 Capping Mechanism

The capping mechanism, which is driven by the pump unit, caps the printhead closely to maintain air tightness of the cap. This operation is required to vacuum ink from the ink cartridges, printhead, cavity, and cap. Also, to moisten the inside of the cap while the printer power is off, this mechanism works to keep the cap and the printhead surface in a tight contact. This function prevents ink from clogging while the printer is not in use.

SC440/640/740 models

Flag for Carriage

Negative pressure

Ink Eject Valve

Valve

For a specific feature of the Stylus COLOR 760, it has a newly designed valveless capping mechanism instead of other printers’ capping mechanism that integrates an air valve. An air valve is usually equipped to remove bubbles created inside the cap by releasing the negative pressure. However, due to change in the ink sequence, the new valveless capping mechanism enables this printer to maintain the initial ink charge and cleaning effects at the same level as before. Figure 2-14 outlines the valveless capping mechanism.

SC 760 model

Flag for Carriage

Ink Eject Valv e Negative pressure

Closed state

Released state

Flags for Frame

Air valve is not assembled in this portion.

Figure 2-14. Valveless Capping Mechanism

Operating Principles Overview 39

EPSON Stylus COLOR 760 Revision C

2.2 Electrical Circuit Operating Principles

The electric circuit of the Stylus COLOR 760 is composed of the following boards.

Main board: C298MAIN Board

Power supply board: C298PSB/PSE Board

Panel board: C298PNL

Refer to Figure 2-15 for the major connection of the three boards and their roles.

C 298 P N L B oard

C 298 M A IN B oard

Power off

3.3V R egulator

+5VD C

C298 PSB/PSE Board

+42VD C

Printer M echanism

C R M otor

PF M otor

H ead D river B oard

Several S ensors

Figure 2-15. Electric Circuit of Stylus COLOR 760

Operating Principles Electrical Circuit Operating Principles 40

EPSON Stylus COLOR 760 Revision C

2.2.1 C298PSB/PSE Board

The Stylus COLOR 760 are equipped with the C298PSB/PSE, the common power supply board for the both products. The basic structure of the circuit is the same as for the C257PSB/PSE board used in the Stylus COLOR 740. The power supply boards of these printers use a RCC switching regulator, which generates +42VDC for drive line and +5VDC for logic line to drive the printer. For one of the major characteristics of the C298PSB/PSE, it uses the secondary switch that is also used in the Stylus Color series. Use of the secondary switch enable the circuit to keep supplying voltage to 5 V line and 24 V line for approximately 30 seconds if the printer power is turned off through the panel switch. This extra time allows the printer to perform the following operations when the printer is turned off through the panel switch while it is in operation.

o When the printer is in a printing state, if the CR unit is away from the home

position, the CR unit can return to the home position to be locked before the printer power shuts down.

o When the printer is not in a printing state, if paper fed from ASF remains in

the printer, the paper is ejected before the printer power shuts down.

Table 2-8 in the right column shows the application of each voltage generated by C298PSB/PSE board.

NOTE: The 5VDC is only applied to the parts and locations shown in the Table

2-8. The C298MAIN, like the C267MAIN-B board*, uses the 3.3V drive chips for most of the logic line chips (CPU, ASIC, ROM, DRAM). For this reason, those chips are not driven by the +5VDC but 3.3VDC that is reduced by the IC9( 3.3VDC regulator) on the C298MAIN board.

* Used in the minor changed models of the Stylus COLOR 740, Stylus Pro

750, and Stylus Pro 1200.

Figure 2-16 in the right column shows the block diagram for the C298PSB/PSE board. The process from the input of AC voltage to the output of 42 V DC and 5 V is explained in the following page.

Table 2-8. Application of the DC Voltages

Voltage Application

+42VDC

CR Motor, PF Motor Head driving power supply

Sensor circuit power supply voltage LED panel drive power supply

+5VDC

Nozzle selector control signal voltage I/F Control Circuit Slave CPU for DC motor control

ZD90

C84,Q84

Power Drop Delay Circuit

PSC S ignal from M ain board

+42VD C Lin D rop Lim itation C ircuit

+42 V D C

D51

+5 VD C

IC 5 1

+5V R egulator

ZD 81-86,Z D 51

+42VD C Line C onstant C ontrol

C51

Sm oothing Circuit

ZD53

+5V D C Line O ver V oltage Lim itation

ZD 52,87

+42VD C Line O ver V oltage Lim itation

TRANS(T1)

Q2,Q3,Q31

F u ll W a v e R e c tifie r c irc u it

DB1

Abnorm al Feed back circuit

AC Input

C11

Sm oothing Circuit

O ver C urrent Protection

F1, TH 1

M ain S w itching Circuit

F ilte r C irc iu t

L1, C 1,C 2

PC1

Photo Coupler

Figure 2-16. C298PSB/PSE Board Block Diagram

Operating Principles Electrical Circuit Operating Principles 41

EPSON Stylus COLOR 760 Revision C

1. Regardless of the state of the power switch (On or OFF), the voltage is always applied to the primary side of the power supply board from the moment or at the state that AC-plug is plugged in. At this time, F1 plays a role of preventing AC100V from coming into the F1. L1 also prevents high harmonic wave noise generated in the RC circuit filter which consists of C1,C2 from going out, and eliminates the noise from outside here.

2) The AC is full-wave rectified by the diode bridge DB1, and converted to

x AC in voltage by the smoothing electrolytic capacitor C11.

3) The pressured up direct current turns Q1 on through the starting resistor R31 and starts the primary side of the circuit.

4) When the primary side is On, the energy (current) led by the electromagnetic induction through the trans (T1) does not flow to the secondary side since the diode (D51) on the secondary side is installed in the opposite direction.

5) When the energy which is charged in the trans is reaching the saturated state, the voltage which makes Q1 on becomes weak gradually. At the point that this voltage drops at the certain voltage, C13 absorbs the current in the opposite direction and Q1 is quickly shut off by the resulting sharp drop.

6) When the primary side is turned off, the energy charged in the T1 is opened according to the diode(D51 ) dire ction whi ch is inst all ed on the secondary side. Basically, 42 V DC is output by these circuit operations and the number of T1 spiral coil.

7) +5VDC is generated by pressured down this +42VDC as power supply. IC51 pressures down the +42VDC and generates precise +5VDC by chopping off the output, forming the standard santooth wave form by the outer RC integration circuit.

The C298PSB/PSE board has the various control circuits to stop voltage output if a malfunction occurs on the power supply board or the main board or while the printer mechanism is on duty. Following explains each control and protection circuit.

o +5V line over voltage protection circuit:

This protection circuit is in the same line as the +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 +5V line forcefully when the voltage level exceeds +9V.

o +42VDC line drop limitation circuit:

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

o +42VDC line over voltage circuit:

This circuit is in the same line as +5V line over voltage protection circuit is located. The output level is monitored by two Zener diodes. If the voltage level exceeds +48VDC, this circuit shuts down the +42V line forcefully.

o +5V line constant voltage/constant current control circuit:

The output current is monitored by the +5VDC generation switching control IC (IC51), which also monitors the output voltage. This information is input to the internal comparator and stabilizes +5V line. The operations of the secondary side switch are explained below.

n When the power is turned on, Q1 repeats on/off automatically along

with the increase and decrease of energy on the trans coil at the primary side. While the power is on, the PSC signal is input to the power supply board from the C298MAIN board.

n This signal turns Q84 on and it becomes possible to discharge energy

between the terminals 8 and 9 of T1. At this time, even if the power is turned off, the electrolytic capacitor keeps Q84 on for a while, and by this electrolytic capacitor, voltage output is held at least 30 seconds. This time helps the printer to complete a power-off operation.

o +42V Line Constant Voltage Control Circuit:

The output level of the +42V line is monitored by a detection circuit composed of the seven Zener diodes. This circuit prevents the voltage from dropping for a constant level of the output voltage .

Operating Principles Electrical Circuit Operating Principles 42

EPSON Stylus COLOR 760 Revision C

2.2.2 C298MAIN Board

The logic circuit of the C298MAIN is composed of the following:

n Logic line (CPU, ASIC, DRAM, EEPROM, and so on) n Various motor control/driver circuits (CR motor, PF motor ) n Head control/driver circuits n Interface control (parallel I/F, USB I/F) n Sensor circuits n Timer circuits n Reset circuits

This main board is mainly different form other models in the following two points.

o Us e of the 3.3V chip s in the logic circu it

The 3.3 V regulator (IC9) on the C298MAIN produces 3.3 V by pressuring down the 5.5 VDC, also generated on this board, to drive several chips. See the table below that separately shows the chips driven by the +5V and +3V.

Table 2-9. 3.3V Drive Chips & 5.5V Drive Chips

+5V 3.3V

Sensors I/F Circuit PNL Board Slave CPU

CPU ASIC P-ROM D-RAM

CR Encoder senser

CN14

M o t o r D r iv e r (IC 1 8 )

C298 PNL

ASF S ensor

CR M otor

P-RO M 16M (IC 2 )

C 90A 11C A CPU (IC20)

CN3 USB

IC 7

IC 2 1

Address

Data

Address

Data

E0BA13KA

PDIUSBF11A

Head

D-RAM 16M (IC 3 )

E05B 70O D A S IC ( IC 8 )

CN8 HD FFC

B a tt1

CN12

CN9 HD FFC

CR1

Tim er & R eset IC (IC 5 )

EEPRO M (IC 6 )

C 90A 120A Slave C PU (IC 15)

CN11

CN 6

CN5

PE S enso r

PF E ncoder Sensor

Q3&Q4

Comm on D r iv e r (IC 10 or IC 1 1 )

IC 4 74VH C 1612B 4

Figure 2-17. Block Diagram for the C298MAIN Board

PF M otor

CN13

M o t o r D r iv e r (IC 1 9 )

C N1 P arallel

Use of the slave CPU Since the CR motor and PF motor of this printer are DC motors, the slave CPU is attached on the main board in addition to the CPU and ASIC. This slave CPU, serving to control the DC motors only, reduces duty of the CPU and ASIC for faster data processing.

See Figure 2-17 for the C298MAIN board block diagram.

Operating Principles Electrical Circuit Operating Principles 43

EPSON Stylus COLOR 760 Revision C

Table 2-10 shows the functions of the CPU, ASIC, and slave CPU.

Table 2-10. Functions of the CPUs and ASIC

IC Location Function

• Measures the printhead tem per ature .

CPU IC20

ASIC IC8

Slave CPU for DC motors

IC15

• Several interrupting functions

• Outputs the system clock sig nal.

• Controls interfaces.

• Controls the printhead drive wave form circ uit.

• Transfers serial data to the printhead.

• Receives panel control signals and sensor signals

• EEPROM

• Controls detection of the signals output from the encoder.

• Sets the current value for the PF motor and CR motor.

• Controls the PF motor and CR motors.

Operating Principles Electrical Circuit Operating Principles 44

EPSON Stylus COLOR 760 Revision C

2.2.2.1 Printhead Driver Circuit

The printhead driver circuit consists of the following two components:

n Common driver IC (IC10: E09A14RA) directly attached to the

C298MAIN board.

n Nozzle selector IC (Sharp IR2C95F or EPSON SED6125T0A) on the

head board.

The common driver (IC10: E09A14RA) generates a reference drive waveform according to the output signals from the C298MAIN board. The reference drive waveform is amplified by the transistors Q3 and Q4 and then transferred to the nozzle selector IC on the head board. Print data is converted to serial data by the ASIC (IC8 E05B70CD) and then sent to the nozzle selector IC on the head board. Based on the serial data, the nozzle selector IC determines the nozzles to be actuated. The selected nozzles are driven by the drive waveforms produced by the common driver. See Figure 2-18 for the printhead driver circuit block diagram.

o Head common driver circuit

The reference head drive waveform is produced in the common driver (IC10: E09A14RA) based on the following 12 signal lines output from the ASIC (IC8 E05B70CD); A0-A4, CLK1, CLK2, RST, FLOOR, DATA, DCLK, and E. By the DATA signal output from the ASIC (IC8 E05B70CD), the original data for the head drive waveform is written in the memory in the IC10. The addresses for the written data are determined by the A0 - A4 signals, and, of among, data used to determine the waveform angles is selected. Then, setting the selected data, producing trapezoid waveform value, and canceling the data are performed by the rising edges of the CLK1 and CLK2 signals.

o Head nozzle selector circuit

Printing data is converted into serial data by the ASIC (IC8 E05B70CD). Then the converted data is allocated to the six rows, the number of the head nozzle rows, to be transferred to the nozzle selector (Sharp IR2C95F) through the six signal lines (HS01 to HS06). Data transmission from the ASIC (IC8 E05B70CD) to the nozzle selector synchronizes with the LAT signal and SCK clock signal. Referring to the transferred data, nozzles to be activated are selected, and the PZTs of the selected nozzles are driven by the drive waveform output from the head common driver.

HW A0 HW A1 HW A2 HW A3 HW A4

HW CLK1 HW CLK2 HW FLR HW RST HW SDATA HW SCLK

HW SLAT

IC 8 A S IC E05B70C D

HCH

HLAT CRAI0 CRAI1

SW CO SW C1

HS01 HS02 HS03 HS04 HS05 HS06

HSOCMD

HSOCLK

to C P U A N 0 p o rt

AO A1 A2 A3 A4 CLK1 CLK2

FLOO R RST DATA DCLK E

IC 1 0 Commom D r iv e r IC

VCC

NPNB

PNPB

CN8

CN9

COM COM

VHV VHV

CH LAT ENA ENB

N ozzle S eleco r IC IR 2 C 9 5 F

COB COA

SI1 SI2 SI3 SI4 SI5 SI6

SP NCHGHNCHG

SCK

THM

Figure 2-18. Printhead Driver Circuit

H ead D rive P u ls e

Operating Principles Electrical Circuit Operating Principles 45

EPSON Stylus COLOR 760 Revision C

2.2.2.2 Reset Circuit

Reset circuits are attached on the C298MAIN board to monitor the two voltages: +5V for the logic line and +42V for the drive line. When each circuit detects abnormality on the corresponding line, it outputs a reset signal to reset CPU and ASIC. This function is necessary to prevent the printer from operating abnormally. IC5 RTC-9820SA, a reset circuit IC, is attached directly on the main board. This IC monitors both the +5V and +45 lines but can reset them independently. See Figure 2-19 for the block diagram for the reset circuits.

o +5V line reset circuit

The VDD port of the IC5 reset IC monitors the +5V line. When the IC detects an abnormal voltage level (4.3 V or lower), it outputs a reset signal from the RST port to CPU and ASIC.

o +42V line reset circuit

The VIN port of the IC5 reset IC monitors the +45V line. When the IC detects an abnormal voltage level (35.5V or lower), it outputs a reset signal from the VDT port to CPU and ASIC.

NOTE: IC5, also serving as RIC (Real Time Clock), manages timer control when

the printer power is turned off. Power for this operation is supplied from the BAT1.

+3.3V

VDT

R26

3.3K

+42V

+5V

VIN VDD

FRST

RST

D2 SB007-03CPTB

BAT1 CR2032

C18

0.1U

C19

0.1U

C21

0.1U

VBK

GND

C E SCLK DATA

Figure 2-19. Reset Circuit Block Diagram

R27

3.3K

IC 8 E05B70C D

NMI

MRES

RESET

TCE TCLK TDATA

Operating Principles Electrical Circuit Operating Principles 46

EPSON Stylus COLOR 760 Revision C

2.2.2.3 CR Motor Driver Circuit

The Stylus COLOR 760 is equipped with a DC motor for the CR motor. In addition to the CPU and ASIC, a slave CPU is mounted on the C298MAIN board. Since the slave CPU is exclusively used to control DC motors, it reduces duty of CPU and ASIC to offer faster data processing.

o CR motor driver circuit

The internal equivalent circuit of the CR motor driver IC (LB1947) is as shown below.

CN8 Head FFC

ENA

ENB

IC 8 E05B70C D

CRAI0

CRAI1

NMI

RXD1

TXD 1

CRBI3

CRPH AB

CREN BB

CRAI2

CRBI2

CRBI3

CPU

P25

IC 1 5 C 90A 13C A

NMI

P31

P33

P32

P30

P64

RES

MD2

P12

P11

P13

P27

P26

PE1

PE2

PE0

PE4

PA0

DA1

+42V

IC 1 8 LB1947

VBB

IN 1

IN 2

VREF

R138

4.4B K

R139

4.99B K

OUTA

OUTB

GND

IC 2 4 M 62552FP

+5V

R112

0.499

C 117 1500p

C115

0.1U

CR-A CR-B

R 115 68BK

R114

12.7K

Unlike a stepping motor, the DC motor that drives the carriage

can not detect the current carriage position by referring to the pulses given. For this reason, a linear scale is attached along the carriage operation range to detect the carriage position. The linear encoder sensor outputs two kinds of TTL level pulses Phase A and Phase B to IC8 ASIC.

180 inches

1/720 inches

Phase A

Phase B

Phase A

Phase B

LED

LEN S

Photo D iodes

1/360 inches

CR Motor CW rotation

CR motor CCW rotation

C o m p a ra to rs

Phase A

Phase B

Figure 2-20. Internal Equivalent Circuit of the CR Motor Driver IC

Figure 2-21. CR Linear Scale Encoder Pulse

The

IC15 slave C PU from the linear encoder via IC8 ASIC. The CPU also sets an appropriate drive current value for the CR position and the direction in which the CR moves based on the data transmitted from the ASIC. So the slave CPU outputs specified control signals to the motor driver. The motor driver IC18 then outputs the CR motor drive current to the CR motor based on the signals sent from the

controls the CR position by referring to the pulses sent

IC15 slave CPU

Direction for the current CR’s movement is detected based on the waveforms of the Phase A and Phase B that are out of phase, while carriage position is controlled by using the waveforms output from Phase A on a cycle basis (1 cycle: 1/180 inches). Phase between the output waveforms A and B is as shown in Figure 2-21. Note all edges in Phase A, Phase B output waveforms (1/720-inch cycle) are used to control the CR position while it is in the home position for ink system.

Operating Principles Electrical Circuit Operating Principles 47

EPSON Stylus COLOR 760 Revision C

Home position detection (capping position detection) Home position is detected based on the pulses output from the linear scale sensor and CD motor control current value. The basic home position detection sequence is as described below:

1/180 inches

1)The linear encoder pulse counter in the IC15 slave CPU is reset during a power-on sequence.

2)The CR motor moves clockwise and the CR moves from left to right. IC15 slave CPU once assumes that the CR comes in contact with the right frame when the following conditions are satisfied:

nThe slave CPU detects the motor control current value 720mA nP1 (= number of pulses output for the above CR movement) is 30*

or less.

* Specified value that indicates CR is movable in the home position.

(All edges in the waveform are used in this condition.)

3)The CR motor rotates counterclockwise and the CR moves from right to left, and the IC15 slave CPU assumes that it detects the CR lock lever position when the following conditions are satisfie d:

nIC15 slave CPU detects the motor control current value 500 mA. nDifference X between P1 and P2 (= number of pulses output while

the CR moves from the right frame) is 30 or less.

4)The CR motor rotates counterclockwise and the CR moves from left to right again, and if IC15 slave CPU detects the motor control current value 720 mA, it assumes that the CR comes in contact with the right frame again.

5)Difference between P1 and P3 (= number of pulses output for the CR’s movement from the CR lock lever to the right frame) is 4 or less.

Phase A

PTS

1/360 inches

Figure 2-22. Print Timing Signal and Linear Encoder Phase A

NOTE: If the drive voltage for the CR motor reaches 800mA, a fatal error occurs.

When all conditions in the sequence are satisfied, the printer detects the CR is

in the home position.

o PTS (Print Timing Signal) production

The circuit produces PTS signal (cycle: 1/360 inches) by dividing waveform cycles for Phase A (cycle: 1/180 inches). The print timing signal is used to eject ink at a correct timing.

Operating Principles Electrical Circuit Operating Principles 48

EPSON Stylus COLOR 760 Revision C

2.2.2.4 PF Motor Driver Circuit

TheStylus COLOR 760 is equipped with a DC motor for the PF motor. In addition to the CPU and ASIC, a slave CPU is mounted on the C298MAIN board. Since the slave CPU is exclusively used to control DC motors, it reduces duty of CPU and ASIC to offer faster data processing. The block diagram for the PF motor driver circuit is as shown below:

OUTA

OUTB

CP1

CP2

VREG

SENSE

GND GND GND

IC 2 4 M 62552FP

+42V

C119

0.22U

C120 022U

R113

0.24

C 116

0.22U

PF-A PF-B

CN12 PF Encorder

ENA

ENB

IC 8 E05B 70C D

CRPHAA

CRENBA

NMI

RXD1

CRBI3

CRPHAB

CRAI2

CRBI0

CRAI3

CPU

P25

IC 1 5 C 90A 13C A

NMI

P31

P33TXD 1

P32

P30

P64CRENBB

RES

MD2

P17

P15

P20

P21

PD3

PD1

PD0

PD4

PD6

PD5

PD7

DA0

SCO N

IC 1 9 A3958S B

MODE

PHASE

ENABLE

RANGE

REF

OSC

CLO CK

DATA

STOROBE

R138

4.4B K

R139

4.99B K

C13

0.1U

Unlike a stepping motor, the DC motor that drives the PF motor can not detect a paper feeding amount by referring to the pulses given. For this reason, a loop scale is attached on the Gear 76 to mechanically detect a paper feeding amount. The loop scale encoder sensor outputs 2two kinds of TTL level pulses Phase A and Phase B to IC8 ASIC.

1/1440 inches

Phase A

PF motor CW rotation

Phase B

1/5760 inches

Phase A

PF motor CCW rotation

Phase B

LEN S

Photo D iodes

C o m p a ra to rs

LED

Phase A

Phase B

Figure 2-23. PF Motor Driver Circuit Block Diagram

IC15 slave CPU controls paper feeding amount by referring to the encoder pulses sent from IC8 ASIC. It also sets a proper drive current value according to the paper feeding amount and direction. So it outputs specified control signal to the motor driver. The motor driver IC19 outputs PF motor drive current to the PF motor according to the control signals from the IC15 slave CPU.

Rotational direction of the PF motor is determined by the phase between the output waveforms of Phase A and Phase B. Refer to Figure 2-24 for different phase for each direction.

NOTE: If the drive voltage for the PF motor reaches 1A, a fatal error occurs.

Figure 2-24. Loop Scale Encoder Pulse

Operating Principles Electrical Circuit Operating Principles 49

EPSON Stylus COLOR 760 Revision C

2.2.2.5 EEPROM Control Circuit

Since EEPROM is nonvolatile memory, it keeps written information if the printer power is turned off. Information stored in EEPROM is various adjustment values, factory values, and printer status values. See Appendix for EEPROM Address Map that provides detailed information on the values stored in EEPROM. EEPROM is connected to ASIC with 4 lines and each line has the following function.

n CS: Chip selection signal n CK: Data synchronism clock pulse n DI: Data writing line (serial data) at power off. n DO: Data reading line (serial data) at power on.

The EEPROM control circuit is as shown below:

+5V

93C 56 (IC 7 )

Vcc

ORG

GND

206

205

204

203

E05B 70C D (IC 8 )

EECS

EECK

EECO

EECI

Figure 2-25. EEPROM Circuit Diagram

The detailed map of the EEPROM is provided in Chapter 7 Appendix.

Operating Principles Electrical Circuit Operating Principles 50

EPSON Stylus COLOR 760 Revision C

2.2.2.6 Sensor Circuit

The Stylus COLOR 760 is equipped with the following five sensors to detect the status of the printer.

n I/C detection sensor n Head Thermistor sensor n PE sensor n ASF home position sensor n PF motor encoder sensor n CR unit encoder sensor

The block diagram for the sensor circuit is as shown below:

CN4 PE Sensor

PRV

C89

GND

C90

CN6 ASF H P Sensor

ASFV

C93

GND

C94

ASF

CN12 PF M otor E ncoder S ensor

ENA

ENB

CN8 C R M otor Encolder S ensor

ENA

ENB

CN9 I/C D e te c tio n S e n s o r & T h e rm is to

COB CCB THM

IC 2 0 C P U C 90A 11C A

AN0

+5v

R57 200

SW A1

DATA Bus

+5v

IC 8 A S IC E05B 70C D

SW A2

CRPHAA

CRENBA

CRAI0

CRAI1

SW C0 SW C1

R93 200

Figure 2-26. Sensor Circuit Diagram

Function and detection method of each sensor is as described below.

o I/C detection sensor (for black I/C and color I/C)

The I/C detection sensor included in the CR unit determines whether a black or color ink cartridge is installed. When an I/C is installed, this sensor detects a mechanical contact with the cartridge and outputs a LOW signal to the ASIC. If no cartridge is installed, it outputs a HIGH signal to the ASIC.

o Head thermistor

The head thermistor is attached directly on the head driver board. It monitors the temperature around the printhead and feeds back the temperature to the CPU analog port. The printer refers to this information to control head driver voltage based on the ink viscosity.

o PE sensor

The PE sensor is located at the bottom right edge of the top frame in the printer mechanism. This sensor detects paper on the rear paper guide, using a photo sensor and PE sensor lever that are included in the sensor. When paper passes, the PE sensor does not interrupt the photo sensor terminals. So a LOW signal is output to the ASIC. If there is no paper, on the other hand, the lever cuts in between the photo sensor terminals, which outputs a HIGH signal to the ASIC.

o ASF HP sensor

The ASF HP sensor, located at the left edge of the ASF, detects the ASF home position. This sensor consists of the ASF HP detector wheel and a photo sensor. A small portion of the ASF HP sensor has a cut out, and when the cutout comes into position between the photo diode terminals, ASF home position is detected. In this status, the photo diode terminals are not blocked, and a LOW signal is output to the ASIC. Referring to the ASF home position detected by this sensor, the printer drives the PF motor to set the LD roller and paper return lever ready for paper loading.

o PF moto r encoder sensor

The PF motor encoder sensor includes the loop scale attached to the left end of the PF roller and the linear encoder. This encoder sensor outputs 2 kinds of the output pulse A-phase and B-phase and the minimum resolution of the sensor is 1/5760 inch, and the sensor outputs HIGH signals for the black lines and LOW signals for the transparent parts to the ASIC. The printer controls the PF motor based on the signals output from this sensor.

Operating Principles Electrical Circuit Operating Principles 51

EPSON Stylus COLOR 760 Revision C

CR unit encoder sensor CR unit encoder sensor includes the linear encoder in the CR unit and the scale plate attached along the CR scanning direction. This encoder sensor outputs two kinds of output pluses Phase A and Phase B, and the minimum resolution of the sensor is 1/720 inches. The sensor outputs HIGH signals for the black bands of the scale and LOW signals for the transparent parts to the ASIC. The printer controls the CR motor based on the signals output from this sensor. The sensor also detects the CR home position.

Operating Principles Electrical Circuit Operating Principles 52

TROUBLESHOOTING

CHAPTER

EPSON Stylus COLOR 760 Revision C

3.1 Overview

This chapter describes how to troubleshoot problems. It consists of the sections shown in the flowchart below. When identifying and troubleshooting problems, be sure to proceed to the correct section specified in the flowchart.

Isolating the faulty part on the pow er supply board

(Section 3.1.2)

Is the printer pow er on?

Yes

Troubleshooting w ith LED error indications

(Section 3.1.1)

Following sections show detailed informat ion on each step in the flowchart. Be sure to perform troubleshooting without neglecting the correct order specified in each section.

First of all, following tables show you the Motor Resistance and the sensor check informations.

Table 3-1. Motor Resistance and Measurement Procedure

Motor Name Location Check Point

CR Motor CN14 (Main board) Pin 1 & 2, 31.1 OHM +/- 25% PF Motor CN13 (M ain Board) Pin 1 & 2, 31.1 OHM +/- 25%

Table 3-2. Sensor Check an Measurement Procedure

Sensor Check Point Finding Description

PE Sensor CN4 Pin 1 & 2

ASF/HP Sensor CN6 Pin 1 & 2

PF Motor Enscorder Sensor

CR Motor Encorder Sensor

Black I/C Detection Sensor

Color I/C Detection Sensor

CN12

CN8

CN9 Pin 15 & Pin 18

CN9 Pin 15 & Pin 17

•0V

•5V

• 0V

• 5V

•0V

•5V

•0V

•5V

•0V

•5V

•0V

Detect the Paper No Paper

Detect the ASF HP Not detect ASF HP

Transparency Slit Black Slit

I/C is not installed I/C is installed

Isolating the faulty part according to the exhibited phenom enons

(Section 3.1.3)

Figure 3-1. Troubleshooting Flowchart

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EPSON Stylus COLOR 760 Revision C

3.1.1 Troubleshooting with LED Error Indications

This section describes how to troubleshoot the problem when the printer indicates an error at power on and can not print . The Stylus COLOR 760 can detect the following six errors & seven status, and indicates them with the LEDs, as shown below.

Table 3-3. Error Indication of Operation Panel

Printer Status

Power On Condition On - - - 9 Ink Sequence Blink - - - 6 Ink Cartridge Replaceme nt Mode Blink - - - 5 Data Processing Blink - - - 8 Paper Out On Off Off On 4 Paper Jam Condition On Off Off Blink 3 No Ink Cartridge / Ink End

(Black) Ink Level Low (Black) - Blink - - 7 No Ink Cartridge or Ink End

(Color) Ink Level Low (Color) - - Blink - 7 Enter EEPROM and Timer IC

Reset Maintenance Request Blink Blink Blink Blink 2

Fatal Error Blink On On Blink

Power Ink Out (Black) Ink Out (Color) Paper Out

-On- -7

--On-7

- ON (for 1 second only) -

Indicators

Priority

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EPSON Stylus COLOR 760 Revision C

See the following tables which show the error conditions and corresponding possible causes.

Table 3-4. Error Condition and the Possible Causes

No. Error Condition Possible Causes

1 Paper Out Error

(Refer to Section

3.1.1.1.)

2 Paper Jam Error

(Refer to Section

3.1.1.2.)

3 NO I/C or Ink Out

Error (Refer to Section3.1.1.3)

4 Maintenance

Error (Refer to Section 3.1.1.4))

1. Failure in paper feeding

2. Connector for the PE sensor is disconnected.

3. The PE sensor actuator is acting improperly. The sensor base is not fixed properly.

4. The PE sensor is defective.

5. ASF dose not move co rrectly

1. The paper in use is longer than specified.

2. The PE sensor remains on because it is covered with paper debris or dust.

3. The PE sensor actuator is not acting properly. The sensor base is not fixed properly.

4. The PE sensor is defective

5. The Hopper Release Lever is not assembled correctly.

1. The counter is not showing the actual remaining ink

level.

2. Ink cartridge sensor actuator is not acting properly.

3. The micro switch is not mounted correctl y.

The connector (green) is disconnected.

4. The connector (green, 3-pin) on the small board

directly attached to the printhead surface side is disconnected. Note the connector (green, 4-pin) is irrelevant as it is for the encoder.

5. The micro swi tch is defecti ve.

6. The value for the ink consumption counter in the

EEPROM is destroyed.

Usual waste ink over-flow is requested. Note this error can be cleared by the special function

through the control panel operation. Otherwise, you can perform the waste ink counter by using the Asjustment program.

Table 3-5. Error Condition and the Possible Causes (continued)

No. Error Condition Possible Causes

5 Fatal Error

(Refer to Section

3.1.1.5)

1. The CR Encorder FFC has come off from the CR Encorder Sensor board. The CR Encorder sensor is not mounted in the CR Assy.

2. The CR Liner scale has come off. The CR Liner scale is not placed through the enco der located at the back of the carriage.

3. The ASF sensor has come off. The connector for the ASF sensor is not disconnected.

4. The ASF sensor is defective or dose not detect the ASF HP position caused by any factor.

5. The PF/CR Encorder Sensor is defective or dose not detect the slite pattern on the each scale.

6. The coil for the CR motor has burnt.

7. The coil for the PF motor has burnt.

8. ASF Gear 32 is disengaged to the Combination Gear 14,28 which is assembled in the DE unit.

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EPSON Stylus COLOR 760 Revision C

3.1.1.1 Remedies for Paper Out Error

This section provides check points and corres ponding actions which are necessary when the Paper Out Error problem has occurred because of either of the following reasons:

n Paper is set in the ASF hopper but not fed. n Paper is fed but not detected by the PE sensor actuator.

Be sure to follow the steps in the order described in the tables.

NOTE:If the finding the detail phenomenon which fits the defective

printer, take the Check & Action described in the right col umn. If “No”, proceed to the next step.Remedies for Paper Error.

Table 3-6. Remedies for Paper Out Error

Step Detail Phenomenon Check & Actions

1 When the Paper Feed

SW is pressed, the ASF LD roller attempts to feed the paper. But, the paper is not loaded. After that, the Panel LED indicates the Paper Out Error.

2 When the Paper Feed

SW is pressed, the ASF LD roller feed the paper to the PF roller. But, ASF LD roller rotate again and the PF roller advances the paper over the TOF position.

After that, the Panel LED indicates the Paper Out Error.

Set a cleaning sheet in the ASF up side down. Then holding the top edge, press t he Load /Eject b utton, a nd the micro pearl on th e p ape r lo ad rol ler (a semicircular roller) surface is removed. To remove severe smear, staple a cloth moistened with alcohol to a post card and clean the roller in the same manner.

N on-adhesive A rea

C L S heet

Adhesive A rea

This side dow n

Check if the connector (yellow, 3- pin) for the PE sensor is connected to PE sen sor or CN5 on the Main Board.

Bottom view of the printer m echanism

C onnector for the PE sensor

(U s e a p o s t c a rd for the base sheet.)

Staplers

C loth m oistened w ith alcohol

Tension spring

3 Ditto

• Using your hand, try activating the actuator in the same condition as it is detecting incoming paper. Then release the actuator and check if the actuator automatically returns to its original position with the tension of the spring.

• Referring to the illustration above, check that the sensor base is securely inst all ed to the frame. If the sensor base is floating or instal led ins ecurel y, insta l it securely.

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EPSON Stylus COLOR 760 Revision C

Table 3-6. Remedies for Paper Out Error

Step Detail Phenomenon Check & Actions

4 When the Paper Feed

SW is pressed, the Paper is ASF LD roller feed the paper to the PF roller. But, ASF LD roller rotate again and the PF roller advances the paper over the TOF position.

After that, the Panel LED indicates the Paper Out Error.

5 When the Paper is

feed with the Load/ Eject SW, it seems that the Hopper is moving correctly. But, the paper is not loaded and the Paper Out Error is indicated on the Operation Panel.

Check if the PE sensor is defective. Measure the voltage at the yellow 3-pin connector CN5 on the Main Board by activating the actuator manually to check that the voltage is correct as follows.

The actuator is in terminals: 5V The actuator is out of terminals: 0V

Main Board CN5

Pin 3 (PE)

Pin 2 (G N D)

M/C

RED

WHT

M/C

CRH PE ASF

BLK

M/C

Hand-rotate the shaft in the ASF in the paper feed direction and check if the hopper hops out every time you rotate the shaft.

NOTE:Even though the ASF HP sensor is in the proper condition for detecting the home position , If the hopper is not operating at the correct timing for paper feeding, paper is not loaded. Therefore, if the ASF sensor is working without this correct combination, reassembly or replace the ASF. In case the ASF HP sensor detect the ASF HP in the paper feed sequece, the Pan el LED indica tes the Fatal Error.

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EPSON Stylus COLOR 760 Revision C

3.1.1.2 Remedies for the Paper Jam Error

This section includes the check points a nd correspondi ng actions whi ch are necessary when the Paper Jam Error constantly occurs when the printer is turned on or feeding paper. The printer detects the Paper Jam Error in the following Condi tions.

n When the printer is turned on, the PE sensor detects the paper

and attempt to eject it by rotating the PF roller. But, the Low signal (paper detect status) is not removed.

Be sure to follow the steps in the order described in the tables.

NOTE:If the finding for the question is Yes, take the action described in

the right column. If “No”, proceed to the next step.

Table 3-7. Remedies for Paper Jam Error

Step Detail Phenomenon Check & Actions

1 When the Paper is

ejected, the PF roller advance the paper. But, the Paper is not ejected completely. And the Panle LED indicates the Paper Jam.

2 When the printer is

turned on, the PF roller rotates continuously about 10 sec. and Panel LED indicates the Pap er Jam.

• ditto

• When the Paper is

loaded from the ASF, the Top of the Paper is loaded to the PF roller. But it dose not reach to the Paper

Guide Front. If Paper Feed Operation is repeated, Fatal Error

is indicated on the Panel LED

Make sure if the paper length is beyond the specifications is used.

Make sure that any paper dust or material push up the tip of the PE sensor Actuator. Viewing the PE sensor from the front, check that the actuator is the correct position: the actuator falls in the cutout without any paper.

PE P aper G uide A ssem bly (Right)

Referring to Step 3 in Section 3.1.1.1 “Remedies for Paper Out Error”, check the sensor condition

Referring to Step 4 in Section 3.1.1.1 “Remedies for Paper Out Error”, Check the sensor function

Make sure if the ASF Hopper Release Lever is assembled properly to the LD roller shaft in the ASF.unit. Refer the following figure.

Left ASF Hopper

PF Roller

Right ASF Hopper

PE S enso Actuator

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EPSON Stylus COLOR 760 Revision C

3.1.1.3 Remedies for No I/C and Ink Out Errors

This section includes the check points a nd correspondi ng actions whi ch are necessary when the black i nk (or color ink) LED comes on or blinks at power on despite the ink cart ridge has been r eplaced wi th a new one . Be sure to follow the steps in the order described in the tables.

NOTE:If the finding for the question is Yes, take the action described in

the right column. If “No”, proceed to the next step.

Table 3-8. Remedies for No I/C and Ink Out Errors

Step Detail Phenomenon Check & Actions

1 Dot missing occurs

despite the Ink end condition is not indicated. And the dot missing number is increased every printing.

Enough ink is remaining in the cartridge, but the printer shows the Ink low or Ink end condition and can not continue to print.

2 If the I/C is removed

and reset into the CR unit, the Ink Out LED is not turn on and off.

The ink consumption counter, separately set for black and color ink, adds up points according to ink weight used to form one dot. This counter is reset (the value returns to zero) when the I/C replacement sequence is performed and I/C is replaced. If the I/C is replaced with the used I/C in the I/C replacement sequence, the following adversities will occur.

• Ink has run out but the printer continues to print and starts false firing, which damages the printhead.

If the new I/C is installed without entering the I/C replacement sequence, the ink cons um pti on co unte r is not reset and the following adversities will occur.

• Enough ink is remaining in the cartridge, but the printer shows the Ink low or Ink end condition and can not continue to print.

Explain the situation to the user well, and replace the I/C with a new one.

Turn the both actuators (right and left) manually and check that they properly push the micro switches. Then, also check that the actuators return to their normal conditions shown in the figure below automatically.

M icro S w itches

Actuator 1

Actuator 2

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EPSON Stylus COLOR 760 Revision C

Table 3-8. Remedies for No I/C and Ink Out Errors (continued)

Step Detail Phenomenon Check & Actions

3 If the I/C is removed

and reset into the CR unit, the Ink Out LED is not turn on and off.

4 Ditto Check if the connector (green, 3-pin) is disconnected

5 Ditto

If the micro switch is not properly attached, the actuators possibly fail to touch the micro switch. Therefore, check that the micro switch is securely attached to the carriage by the hooks.

onnector

M icro Sw itches

H ooks

from the head circuit board.

1.Keeping the left micro switch pressed down, place the probes of the tester to the middle and left pins to check for electrical continuity.

2. Keeping the right micro switch pressed down,

place the probes of the tester to the middle and right pins to check for electrical continuity.

Step1

Step2

Table 3-8. Remedies for No I/C and Ink Out Errors (continued)

Step Detail Phenomenon Check & Actions

6 Is data in the

EEPROM destroyed?

If the address for the ink consumption information in the EEPROM is garbled and the p rinter s hows the In k Out (Ink End) error constantly, the printer sets the interface signal “BUSY” to High and stops communication with any other peripheral devices.

Therefore, it is effective to replace the I/C with a new one to forcibly overwrite the address with 00H.

Push 1

Push 2

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EPSON Stylus COLOR 760 Revision C

3.1.1.4 Remedies for the Maintenance Error

While the printer is in this error condition, it disables all operations including data communication except for the panel operat ion specified to clear the error. Therefore, follow the steps described in Table 3-9 to solve the problem.

Table 3-9. Remedies for the Maintenance Error

Step Actions Correct LED condition

1 Turn the printer on while pressing the

Load/Eject and the Cleaning buttons, and the Paper Out LED starts blinking. (Blinks for three seconds.)

2 While the Paper Out LED is blinking (for

three seconds), press the Cleaning button for ten seconds.

The Paper Out LED is blinking.

The follo wing three red LEDs blink and turn off. : Ink Out LED (Black), Ink Out LED (Color), and Paper Out LED.

NOTE:During the Step 2, if the Load/Eject button is pressed, the

Maintenance Error is not cleared but the EEPROM initialization mode is activated instead. The EEPROM initialization can be used to recover from conditions such as the print e r does not accept any data from the PC. The EEPROM initialization mode initializes the fo llo w i n g it e ms :

o Accumulated power-off time:The value for the Timer IC is reset. o CL Timer: The CL timer, which is also called fire-

waiting timer, secures the printer specific period of time so bubbles formed around the printhead during a cleaning vanish.

o I/F selection: Selects “Auto”, the factory default,

from 3 I/F selection items: Auto, Parallel, USB.

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EPSON Stylus COLOR 760 Revision C

3.1.1.5 Remedi es for Fatal Error

A fatal error is basically caused by any of the following conditions:

-The printer does not detect the carriage in the home position.

-The printer does not detect signals from the linear scale.

-The ASF sensor does not detect the ASF home position. The following tables show various causes of the error and

corresponding solutions. Be sure to fol low the steps correctly to solve

Step Detail Phenomenon Check & Actions

3 When the Printer is

Table 3-10. Remedies for Fatal Error (continued)

Referring to the figure below, check that the ASF turned on, the CR move a little and it sounds the ASF Hopper moving . After that, the Panel LED indicates the Fatal Error.

sensor is attached to the correct position.

Check that both connectors 1 and 2 are securely

connected.

AS F S ensor

SF Fram e

(Left)

the problems.

NOTE:If the finding the detail phenomenon which fit the defective

printer, take the Check & Action desc ribed in the righ t column. I f “No”, proceed to the next step.Remedies for Fatal Error

Table 3-10. Remedies for Fatal Error

Step Detail Phenomenon Check & Actions

1 Whe n the Printe r is

powered on:

• The CR unit moves in the capping area.(CR unit is fixed with CR lock lever)

• The CR unit moves and strikes the left frame because it is not fixed with the CR lock.

After that, the Panel LED indicates the Fatal Error.

Check the CR Encorder sensor board visually.

• In case the CR Encorder sensor board is not mounted in the sensor mounting position, mount the it in the CR mounted position securely.

In case the CR Encorder FFC is disconnected from the connector on the CR Encorder sensor board, connect it securely.

CR Encorder Sensor

4 Ditto Check for the correct voltages at 3-pin connector

C onnector 1

Main Board CN 6

M/C

shown in the figure below. Turn the printer on and check the voltage is correct as follows:

• When the ASF HP Wheel is in the HP, the v ol tage is 0 VDC.

• When the ASF HP Wheel is out of the HP, the voltage raises to 5 VDC..

To Pin 1

To Pin 3

(ASF)

(CRHP)

C onnector 2

CRH PE ASF

WHT

M/C

BLK

Main Board CN6

M/C

RED

CRH PE ASF

M/C

RED

WHT

M/C

BLK

2 Ditto Referring to step 2 in Section 4.2.4.7 Figure 4-49,

check that the Liner scale is set between the sensor parts. Also check that th e sensor is free from dust and paper debris.

To Pin 2 (GND)

T o P in 2 (G N D )

M/C

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EPSON Stylus COLOR 760 Revision C

Table 3-10. Remedies for Fatal Error (continued)

Step Detail Phenomenon Check & Actions

5 When the Printer is

turned on, the CR move a little and the PF motor also moves little. After that, the Panel LED indicates the Fatal Error.

6 Whe n the Printe r is

turned on, the CR motor dose not move at all. (PF motor moves.)

After that, the Panel LED indicates the Fatal Error

• Check for the correct waveform at 5 pins of FFC. The PF Motor Encorder Sensor FFC is c onn ec ted to CN12 on the C298 Main Board . Check tha t both connectors Pin 1 & 4 or Pin 1& 2 .

• Check for the correct waveform at 21pins of head FFC. The Head FFC is connected to CN8 on the C298 Main Board. Check th at both conn ectors Pin 2 & GND or Pin 4& GND.

Since the CR motor is DC motor, measure the coil resistance using the tester as following figure

<Resistance: 31.1

Ω ± 25%>

Table 3-10. Remedies for Fatal Error (continued)

Step Detail Phenomenon Check & Actions

7 When the Printer is

turned on, the PF motor dose not move. After that, the Panel LED indicates the Fatal Error.

8 When the Printer is

turned on,

• it dose not sound the hopper moving.

• it sounds as if the gear tooth strike noisy and the ASF Hopper dose not move.

After that, the Fatal Error is indicated on the Panel LED.

Since the PF motor is DC motor, measure the coil resistance using the tester as following figure

<Resistance: 31.1

• Make sure if Gear 27.2 is assembled to the left edge of the ASF LD shaft as following figures

Ω ± 25%>

PF Motor

CR Motor

Gear 27.2

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EPSON Stylus COLOR 760 Revision C

3.1.2 Isolating the Faulty Part on the Power Supply Board

This section explains how to troubleshoot the following problems: o The printer is turned on, but the initialization is not performed and

LED on the control panel do not come on.

o Problems after power on Be sure to perform troubleshooting in the order specified, because the

parts involved are mentioned in the disassembly procedure to facilitate servicing.

Table 3-11. Isolating the Faulty Part on the Power Supply Board

Step Check Point Action

1 Is the Panel FFC

disconnected from the connector on the panel board?

2 Is the Panel FFC

disconnected from the CN11 (black, 12-pin) on the Main Board.

3 Is the 3pin of the Panel

FFC breaking wire condition?

The power switch fo r this prin ter is in the seco ndary side. Ther efore, if the FFC does not transfer signals, the printer does not operate despite the power supply board and the main board are properly connected.

This printer uses the power switch on the secondary side. Therefore, if the FFC does not transfer signals, the printer does not operate despite the power suppl y board and the main boa rd are properly connected.

Check the 3pin’s line on the Panel FFC with the circuit tester.

Table 3-11. Isolating the Faulty Part on the Power Supply Board

Step Check Point Action

7 Is the choke coil L1

broken?

8 Is the transformer (T1)

broken?

Viewing the reverse side of the power supply board, check for the proper continuity at the two points indicated in the figure below.

Referring to the figure below, check if the transformer is disconnec ted between the po les. Try every combination in each group marked with a blue box.

4 Has the fuse (F1) on

the power supply board blown?

5 Is CN1 on the power

supply board disconnected?

6 Is CN10 on t he Main

Board disconnected?

Check if the line in the F1 located beside the CN1 on the powe r supply board has blown.

Check that the connec tors CN1, which are used to apply AC power to the primary side on the PS board, are properly c o nnected.

Check that the connector CN10, which are used to apply the DC voltage to the Main board, are properly connected.

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EPSON Stylus COLOR 760 Revision C

Table 3-11. Isolating the Faulty Part on the Power Supply Board

Step Check Point Action

9 Is the main switching

FET (Q1) defective?

10 Is the NPN connection

transistor defective?

Check the electric al con tinuit y of the s witchi ng FE T by trying four patterns below. Be sure to pay attention to the po larity. If the mai n switching FET is good, the findings should be as shown under the figure.

Step.1

Step.3

Step.2

Step.4

Step 1: Off, Step 2: On, Step 3: Off, Step 4: Off Check the electrical continuity of the NPN

connection transistor on the C298 PSB/SE board by trying four patterns below. Be sure to pay attention to the polarity. If the NPN contact transistor is good, the findings should be as shown under the figure. Note the NPN connection transistor is shown in the circuit diagram as described below.

Step.1

NPN Tr

Step.2

Table 3-11. Isolating the Faulty Part on the Power Supply Board

Step Check Point Action

11 Is the PNP connection

transistor defective?

Check the PNP connection transistor on the C298 PSB/SE board in the same manner described in the previous step.

Step.2

Step.4

Step.1

Step.3

PNP Tr

Step 1: Off, Step 2: On, Step 3: Off, Step 4: On

12 Is the +5 V regulator

(IC51) defective?

Check the IC51 for the oscillation waveform (measured by using a oscillo scope) output from the Pin 2. If the output waveform is as shown below, it means the IC51 is working properly.

GND

Step.3

Step.4

O scillation w aveform

5-pin(O S C )

IC 5 1

Step 1: On, Step 2: Off, Step 3: Off, Step 4: On

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EPSON Stylus COLOR 760 Revision C

3.1.3 Isolating the Faulty Part according to the Phenomenon

Refer to this section if you could not solve the problem in Section 3.1.1 or Section 3.1.2 or need more information to isolate the cause according to the exhibited phenomenon. The contents mostly cover the problems relating to the C298 and their remedies.

Table 3-12. Phenomens Exhibited

No. Phenomenon Exhibited Table to refer to

1 CR motor does not rotate. Table 3-13 2 PF motor does not rotate. Table 3-14 3 Cleaning does not solve the print problem. Table 3-15

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EPSON Stylus COLOR 760 Revision C

Table 3-13. CR Motor does not Operate Table 3-14. PF Motor does not Operate

Step Check Point Action

1 Getting ready

for inspecting waveforms.

The connector CN14 used to control the CR motor is indicated in the figure below. Using the oscillo scope, check for the waveform for each phase at the indicated connector. To check the waveform, press the Load/Eject button to attempt to move the carriage. Be sure to leave the cable for the CR motor connected.

NOTE: The GND can be output by placing the p r obe of

the oscillo scope to the tapped hole in the bottom plate on the board with a screw. Note the connector has no ground line since this printer drives the motor with the bipolar system.

2 Check of the

waveform and remedies

While trying to drive the CR motor, the waveform output from each phase should be as shown in the figure. If the waveform output from each phase is as shown below, replace the CR moto r. I f n ot, rep lac e the IC1 8 ( CR mo tor driver IC) or C298 Main Board.

V1=0.1V

C298Main Boar

Step Check Point Action

1 Getting ready

for inspecting waveforms.

The CN13 connector used to control the PF motor is indicated in the figure below. Using the oscillo scope, check for the waveform for each phase output from the indicated connector. To check the waveform, press the Load/Eject button to attempt the ASF paper feeding. Be sure to leave the cable for the PF motor connected.

NOTE: The GND can be output by placing the pro be of

the oscillo scope to the tapped hole in the bottom plate on the boa rd with a screw. Note the connector has no ground line since this printer drives the motor with the bipolar system.

2 Check of the

waveform and remedies.

While trying to drive the PF motor, the waveform output from each phase should be as shown in the figure. If the waveform output from each phase is as shown in the figure, replace the PF motor. If not, re pla ce the IC1 9 (PF motor driver IC) or C298 Main Board.

V1=0.1V

C298Main Board

B lack Lin e :CR -A

R ed Line: C R -B

50V 50V

S A M P L E C 2 0 u S

NOTE: The GND can be output by placing the p r obe of

the oscillo scope to the tapped hole in the bottom plate on the board with a screw.

50V 50V

NOTE: The GND can be output by placing the pro be of

the oscillo scope to the tapped hole in the bottom plat e on the board with a screw.

Black Line :PF -A

R ed Line: P F -B

S A M P L E C 2 0 u S

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EPSON Stylus COLOR 760 Revision C

Table 3-15. Cleaning does not Solve the Print Problem

Step Check Point Action

1 Repeat the cleaning

7 or 8 times.

2 Trying the initial ink

charge operation.

3 Reinstalling the

printhead FFC.

Unlike the previous products, the Stylus Color 860/ 1160 is not equipped with the CL3 (dummy cleaning). Therefore, you can repeat the cleaning every time you press th e Cleaning button with out running a self-test nor any printing.

You can repeat the initial ink charge operation in the way described below:

1. Using the exclusive program, reset the initial ink charge flag in the EEPROM.

2. Turn the pr inter back on. (Refer to Chapter 5 for details.)

Remove the u pper case and check if the FFCs are properly connected to the CN8 and CN9 on the C298 Main Board. Even though they are not installed aslant as shown below, disconnect the FFC once and con nect t hem a gain, t hen run a pri nt check.

C298 Main Board

Table 3-15. Cleaning does not Solve the Print Problem (continued)

Step Check Point Action

4 Check the cap for

any foreign matter, dirt, or damage.

5 Has the Tension

Spring assembled in the Cap Unit come off?

Remove the printer mechanism and release the carriage lock to move the carriage unit away from the home position. Then, have a close look at the cap rubber and check for any problem below.

Foreign m atter Dust

D am aged area on the rubber

R ubber

a rt o f th e c a

If the compression Spring assembled in the Cap Unit, comes off, the sealing ability is lowered and the cap rubber portion d ose no t fit to the surfac e of the printhead. And the in k i s n ot a bs orbe d fro m t he head. Therefore, check that the Compression Spring is securely assembled in the following figured portion..

CompressionSpring

Cap Assembly

Troubleshooting Overview 69

EPSON Stylus COLOR 760 Revision C

Table 3-15. Cleaning does not Solve the Pr int Problem (continued)

Step Check Point Action

6 Is any ink tube

disconnected from the cap unit?

7 Is the FFC

disconnected from the printhead board?

Referring to the figure below, check the following points:

• The ink tube is inserted to the Cap assembly

securely as following figure.

• There is no damage on the ink tube.

Remove the Head FFC holder from the CR unit, and heck that two FFC is properly connected. Even though no slant connection nor disconnection is found, disconnect the FFC once and install them again.

Table 3-15. Cleaning does not Solve the Print Problem (continued)

Step Check Point Action

8 Is the head driver

transistor defective?

If you see the C298 Main from the heat sink side, the following two power transistors can be found:

• Q3 and Q4: Outputs the common voltage To check if eac h pai r t rans is tor is wo rki ng properly,

check the trapezoid waveform at the emittor terminal of the charging side. Check the waveform while running a print.

Head FFC

• Check the continuity of each transistor by referring the Step 11 for the “Isolating the Faulty Part on the Power Supply Board”

Head Board

NOTE: Frequency of waveform and voltage level

(p-p) varies if printing is performed through the driver. Therefore, as long as the trapezoid waveform is output, the head driver IC is considered good, and the printhead must be replaced in that case.

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EPSON Stylus COLOR 760 Revision C

Table 3-15. Cleaning does not Solve the Pr int Problem (continued)

Step Check Point Action

9 Is the head driving

pre-driver defective?

If a trapezoid waveform is not output in the previous step, check al l the power transi stors (Q 3 Q4) for base waveform. Like the head transistor in Step 8, the base terminal input the simi lar trapezoid waveform from the pre driver IC, but any wave form is not input at Emita terminal. Replace the Power

Transistor. If the waveform are not output correctly on Base

terminal of each Power Transistor, replace the IC10 or 11 on C298 Main Board. Otherwise, replace the C298 Main Board.

Troubleshooting Overview 71

DISASSEMBLY AND ASSEMBLY

CHAPTER

EPSON Stylus COLOR 760 Revision C

4.1 Overview

W ARNING

This chapter describes procedures for disassembling the main components of EPSON Stylus COLOR 760. Unless otherwise specified, disassembly units or components can be reassembled by reversing the disassembly procedure. Therefore, no assembly procedures are included in this chapter. Precautions for any disassembly or assembly procedure are described under the heading “CHECK POINT”. Any adjustments required after disassembling the units are described under the heading “REQUIRED ADJUSTMENT”.

4.1.1 Precautions for Disassembling the Printer

See the precautions given under the heading “WARNING” and “CAUTION” in the right column and the following page, respectively, when disassembling or assembling EPSON Stylus Color 760.

n Disconnect the power cable before disassembling or

assembling the printer.

n Wear protective goggles to protect your eyes from ink. If

ink gets in your eye, flush the eye with fresh water and see a doctor immediately.

n If ink comes into contact with your skin, wash it off with

soap and water. If irritation occurs, contact a physician.

n A lithium battery is installed on the main board of this

printer. Be sure to observe the following instructions when serving the battery:

n Keep the battery away from any metal or other batteries so

that electrodes of the opposite polarity do not come in contact with each other.

n Do not heat the battery or put it near fire. n Do not solder on any part of the battery. (Doing so may

result in leakage of electrolyte from the battery, burning or explosion. The leakage may affect other devices close to the battery.)

n Do not charge the battery. (An explosion may be generated

inside the battery, and cause burning or explosion.)

n Do not dismantle the battery. (The gas inside the battery

may hurt your throat. Leakage, burning or explosion may also be resulted.)

n Do not install the battery in the wrong direction. (This may

cause burning or explosion.)

n Danger of explosion if the battery is incorrectly replaced.

Replace only with the same or equivalent type recommended by the manufacture. Dispose the used batteries according to government’s law and regulations.

CAUTIO N

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.

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EPSON Stylus COLOR 760 Revision C

4.1.2 Tools

CAUTIO N

n Never remove the ink cartridge from the carriage unless

this manual specifies to do so.

n When transporting the printer after installing the ink

cartridge, be sure to pack the printer for transportation without removing the ink cartridge.

n Use only recommended tools for disassembling,

assembling or adjusting the printer.

n Apply lubricants and adhesives as specified. (See Chapter

6 for details.)

n Make the specified adjustments when you disassemble the

printer. (See Chapter 5 for details.)

n When assembling, if an ink cartridge is removed and needs

to be installed again, be sure to install a new ink cartridge because of the following reasons;

n Once the ink cartridge mounted on the printer is removed,

air comes in and creates bubbles in the cartridge. These bubbles clog ink path and cause printing malfunction.

n If an ink cartridge in use is removed and is reinstalled, ink

quantity will not be detected correctly since the counter to check ink consumption is cleared.

n Because of the reasons above, make sure to return the

printer to the user with a new ink cartridge installed.

Table 4-1 lists the tools recommended for disassembling, assembling, or adjusting the printer. Use only tools that meet these specifications.

Table 4-1. Tool List

Tools

(+) Driver No.2 O.K. B743800200 (+) Driver No.1 O.K. B743800100 Tweezers O.K. B741000100 Hexagon Box Driver

(Opposite side:5.5mm)

Commercially

Available

O.K. B741700100

Code

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EPSON Stylus COLOR 760 Revision C

4.1.3 Screw Specifications

Table 4-2 shows screw specifications. During assembly and disassembly, make sure that the specified types of screws are used at proper locations, referring to the table below. Note that the screw numbers described in the manual correspond to the numbers in the table.

Table 4-2. Screw Specifications

No. Body Name Size

1 +Bind, S-tite M3X6

5 +Pan head (C.P.) M3X6

8 +Bind, S-tight, M3X10

+Bind, P-tite (CBP tight)

+Pan head, B-tite Sems W1

+Bind, S-tight, Sems R2(CBS Sems)

+Pan head, B-tite Sems W1

M3X6

M3X8

M2.5X5

M3X8

M3X6

1.7 X 5

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EPSON Stylus COLOR 760 Revision C

4.1.4 Service Checks After Repair

Before returning the printer after servicing, use the check list below, which enables you to keep record of servicing and shipping more efficiently.

Table 4-3. Inspection Checklist for the Repaired Printer

Category Component Item to check Is Check Required?

Self-test Is the operation normal? oChecked / oNot necessary On-line test Was the on-line test successful? oChecked / oNot necessary Printhead Is ink ejected normally from all nozzles? oChecked / oNot necessary

Does the carriage move smoothly? oChecked / oNot necessary Any abnormal noise during movement? oChecked / oNot necessary

Carriage mechanism

Printer units

Paper feeding mechanism

Adjustment Specified adjustment items Are adjusted conditio ns all right? oChecked / oNot necessary

Lubricant Specified lubricated item

Function ROM version Newest version: oChecked / oNot necessary

Shipment package

Others Attached items Are all attached items from users included? oChecked / oNot necessary

Ink cartridges are the ink cartridges installed correctly? oChecked / oNot necessary Protection conditions during

transport

Any dirt or obstacles around the shaft of carriage guide?

Is the CR motor at the correct temperature (not over heating)?

Is paper fed smoothly? oChecked / oNot necessary Does paper get jammed? oChecked / oNot necessary Does paper get skew during paper feeding? oChecked / oNot necessary Are papers multi fed? oChecked / oNot necessary Does the PF motor get overheated? oChecked / oNot necessary Abnormal noise during paper feeding? oChecked / oNot necessary Is the paper path clear of all obstructions? oChecked / oNot necessary

Is lubrication applied to the specified locations? oChecked / oNot necessary Is the quantity of lubrication adequate? oChecked / oNot necessary

Is all the pointed parts firmly fixed? oChecked / oNot necessary

oChecked / oNot necessary

Disassembly and Assembly Overview 76

EPSON Stylus COLOR 760 Revision C

4.2 Disassembly Procedures

The flowchart below shows procedures for disassembly.

Figure 4-1. Flowchart of Disassembly

Disassembly and Assembly Disassembly Procedures 77

EPSON Stylus COLOR 760 Revision C

4.2.1 Removing the Upper Housing

Since the printer mechanism itself structures the bottom part, the printer mechanism appears just by removing the Upper Housing.

1. Open the printer cover and turn the PG adjustment lever towards (+) side.

2) Remove 4 screws (No.8) securing the Upper Housing, and remove by lifting it upward. Refer to Figure 4-2.

CAUTIO N

Lift up and remove the Upper Housing, pulling it forward. (Since it collides with the carriage.)

CHECK

POIN T

After assembling the Upper Housing, confirm the Head FFC is placed in the gutter which is located in the back side of the Upper Housing. If the Head FFC is not placed in the gutter, it may damage the FFC.

Upper Housing

No.8 Screw

No.8 Screws

Figure 4-2. Removing the Upper Housing

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EPSON Stylus COLOR 760 Revision C

4.2.2 Removing the Circuit Board Assembly

Since the Main Board and Power Supply Circuit Board are built in a separate bracket from the Printer Mechanism, remove the whole bracket from the printer mechanism.

1. Remove the Upper Housing. (Refer to 4.2.2)

2) Remove the 7 screws(No.1) securing the M/B Shield Plate on the printer mechanism. Refer to Figure 4-3.

No.1 Screw No.1 Screws

Holder A

Holder B

n CN1(AC Source on PS board), CN5 (PE sensor),

CN6 (ASF HP sensor), CN8 (Head FFC1), CN9 (Head FFC2), CN10 (PS Cable), CN11 (Control Panel), CN12 (PF Encoder Sensor)

After removing all cables from the Main Board, detach the Shield Plate M/B Assembly completely from the printer mechanism.

4) When removing each Circuit Board unit from the “M/B Shield plate”, remove the screws securing each unit and shield plate.

n C298 Main Board : Total 12screws

(No.1 screw: 9screws) (No.5 screw: 3screws)

n C298 PS Board : Total 4screws (No.1 screw: 4 screws)

Refer to the next page for Figure 4-4. Also, when removing the Power Supply Board, remove the cable connecting to the Main Board (CN10 with lock device)

No.1 Screw

No.1 Screws

Figure 4-3. Removing the M/B Shield Plate

3) Pull out the “M/B Shield Plate Assembly” a little bit and remove cables which are hung on the A and B holders as you can see in Figure 4-3. Then, take all following cables out of connectors on the main board.

Disassembly and Assembly Disassembly Procedures 79

EPSON Stylus COLOR 760 Revision C

C298PSB/PSE Board

Shield Plate M/B Assembly

No.5 Screws

Figure 4-4. Removing Each Circuit Board

No.1 Screws

Earth Plate

C298 Main Board

ADJUSTMENT

REQUIRED

CHECK

POIN T

Be sure to perform the following adjustments when the Main board is replaced;

1. Head voltage ID Input (Refer to Chapter 5.)

2. Bi-D adjustment, including Head Gap adjustment (Refer to Chapter 5.)

3. USB ID data input (Refer to Chapter 5.)

Be sure to exchange the following parts also when the Main Board is replaced;

1. Waste Ink Absorption Pad

2. Ink Cartridge (BK & Color)

This parts exchange is required since the several ink counters stored in the EEPROM are lost with the Main board exchange.

Make sure that each cables is set in the correct cable holder (A or B) on the M/B Shield Plate. Refer to Figure 4-5.

Cable Holder A

Cable Holder B

CAUTIO N

n Since the CN10 has connector locks, be sure to release the

locks before removing the cables. Also, make sure to lock them when connecting the cable.

PE Detector Cable

Panel FFC

ASF HP Sensor Cable

Head FFC

CR Encoder Sensor FFC

CR, PF Motors

Figure 4-5. Set each Cable to A and B Cable holder

Disassembly and Assembly Disassembly Procedures 80

EPSON Stylus COLOR 760 Revision C

4.2.3 Removing the Operation Panel

1. Remove the Upper Housing. (Refer to Section 4.2.1.)

2) Remove two screws (No.1) securing the Operation Panel Assembly and separate the Operation Panel Assembly from the Printer Mechanism.

3) Remove two screws (No.3) and detach the Sub Right Panel Housing from the Operation Panel Assembly.

4) Remove the Panel Shield Plate and C298 PNL board from the Operation Panel Assembly.

5) Disconnect the Panel FFC from the connector on the C298/303 PNL board.

CAUTIO N

Removing the Operation Panel Assembly also separates the stacker assembly from the Printer Mechanism, since the Stacker Assembly is held with Operation Panel.

Operation Panel

Assembly

Sub Right

Panel Housing

No.1 Screws

Panel Shield

Plate

No.3 Screws

Figure 4-6. Removing the Operation Panel

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EPSON Stylus COLOR 760 Revision C

4.2.4 Disassembling the Printer Mechanism

Since Stylus Color 760 does not have the Lower Housing, the printer mechanism part should already have appeared by now. Therefore, this section explains procedures for disassembling the major parts or units of the printer mechanism.

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EPSON Stylus COLOR 760 Revision C

4.2.4.1 Removing the Printhead Unit

1. Remove the Upper Housing. (Refer to Section 4.2.1.)

2) Slide the CR Lock Lever to the front using tweezers or small driver and release the CR Lock Lever from the CR unit. Then move the CR Assembly to the left.

3) Take both black and color ink cartridges out of the CR Assembly.

4) Remove the blue covers for black and color ink cartridges from the CR Assembly.

5) Remove the Torsion Spring 49 from the left side of the CR Assembly and one screw (No.2) securing the Fastener Head Plate. Then take out the Fastener Head Plate. Refer to the Figure 4-7.

6) Remove the Head FFC Holder from the CR unit by releasing four hooks. (Two hooks; Left/Right sides of CR unit, Two hooks; Back sides of CR unit) Refer to Figure 4-7.

One Hook for Head

FFC Holder

Two Hooks for Head FFC Holder

Torsion Spring 49

No.2 Scr ew

One Hook for Head FFC Holder

Head FFC

Holder

Fastener Head Plate

Figure 4-7. Removing the Printhead

7) Remove the two Head FFC being connected to the Printhead Drive Circuit Board built in the CR unit and remove the narrow FFC from the CR Encoder Sensor Board on the CR Assembly.

Disassembly and Assembly Disassembly Procedures 83

EPSON Stylus COLOR 760 Revision C

CHECK

POIN T

CAUTIO N

ADJUSTMENT

REQUIRED

n Make sure that the earth board is installed at the right corner

of the CR unit correctly. There are 2 pins used to determine the location. Refer to Figure 4-8.

n When you install the printhead to the carriage, make sure

that the protrusion on the carriage side is placed in the Uditch of the printhead. Refer to Figure 4-8.

n Since the ink cartridge once taken out can not be used

again, be sure to install a new ink cartridge when you return the printer to the user.

n Before packing the printer for transportation, make sure

new ink cartridges are installed and the carriage is locked with the CR lock lever securely.

When you replace the printhead unit, perform the following adjustments. (Refer to Chapter 5 for more details.):

1. Initial ink charge (Refer to Chapter 5/Section 5.2.3.9.)

2. Head Voltage ID Input (Refer to Chapter 5/Section 5.2.3.5.)

3. Head Angular Adjustment (Refer to Chapter 5/Section

5.2.3.6.)

4. Bi-D Adjustment (Chapter 5 /Section 5.2.3.7.)

Printhead Surface side

Printhead Circuit Board

Figure 4-8. Installing the Printhead

Disassembly and Assembly Disassembly Procedures 84

EPSON Stylus COLOR 760 Revision C

4.2.4.2 Removing the Waste Ink Abso rber Tray Assembly

1. Remove the Upper Housing. (Refer to Section 4.2.1.)

2) Remove one screw (No.1) securing the Left Housing Panel to the Printer Mechanism. Refer to Figure 4-9.

3) Remove two screws (No.1) securing Left Sub Frame and remove Left Sub Frame. Refer to Figure 4-9.

Paper Eject Assy

No.3 Screws

No.1 Screws

Left Sub Frame

Figure 4-9. Removing the Left Housing Panel &Left Sub Frame

4) Insert a screw driver through the center hole on the Paper Eject Assembly and remove one screw (No.3) securing the Lower Paper Support Front to the Waste Ink Absorber Tray Assembly. Release three hooks fixing the Lower Paper Support Front and remove the Lower Paper Support Front. Refer to Figure 4-10.

5) Remove one screw (No.3) securing Waste Ink Absorber Tray Assembly located in the right side of the printer mechanism. Refer to Figure 4-10.

6) On the Left side of the printer mechanism, using tweezers or a small screw driver, carefully shift the Tray Spacer securing the Waste Ink Absorber Tray Assembly to left horizontal ly. See Figur e 4-10.

7) Remove the Waste Ink Absorber Tray Assembly pulling it downward.

hook

Lower Paper Support Front

Tray Spacer

hook

Waste Ink Absorber Tray Assy.

Figure 4-10. Removing two No.3 screws and Tray Spacer

Disassembly and Assembly Disassembly Procedures 85

EPSON Stylus COLOR 760 Revision C

CAUTIO N

ADJUSTMENT

REQUIRED

1. When installing the Waste Ink Absorber Tray Assembly, make sure to fix it with the Spacer Tray in the left side of the printer mechanism. Refer to the Figure 4-11.

2. Be careful not to damage Loop Scale when the Tray Spacer is removed.

1. When the Waste Ink Absorber was replaced, perform the following Panel Reset Function for ink overflow counter. Turn on the Printer while holding the “Load/Eject SW”+”Cleaning SW”, and hold “Cleaning SW” 10 seconds. For details, Refer to the Chapter 5 Section 5.2.3.11. Otherwise, perform the waste ink counter reset ope ration by using the adjustment program.

Space Tray

Figure 4-11. Installing the Spacer Tray

Disassembly and Assembly Disassembly Procedures 86

EPSON Stylus COLOR 760 Revision C

4.2.4.3 Removing the Ink System Assembly

NOTE: The Pump Assembly and Cap Assembly are included in the Ink System

Assembly

1. Remove the Upper Housing. (Refer to Section 4.2.1.)

2) Remove the Operation Panel. (Refer to Section 4.2.3.)

3) Remove two screws (No.1) securing the Right Sub Frame. Refer to Figure 4-12.

Raise the Printer Mechanism in the red arrow direction.

Figure 4-13. Raising the Printer Mechanism

NO.1 Screws

Right Sub Frame

Figure 4-12. Removing the Right Sub Frame

4) Remove the Waste Ink Absorber Tray Assembly. (Refer to Section

4.2.4.2.)

5) Raise the Printer Mechanism toward ASF side so that you can see the bottom of the Printer Mechanism. (Refer to Figure 4-13.)

Disassembly and Assembly Disassembly Procedures 87

EPSON Stylus COLOR 760 Revision C

6) From the Middle Frame, remove three screws (No.1) securing the Pump Assembly in the Ink System Assembly. Then, from the Right Frame, remove one screw (No.1) securing the Cap Assembly in the Ink System Assembly. Refer to Figure 4-14.

7) Release three hooks fixing the Cap Assembly to the Metal plate for Ink System Assembly and remove the Cap Assembly. Refer to Figure 4-14.

8) Remove ink tube from the Cap Asse mbl y care ful ly.

Middle Frame

CAUTIO N

n When you replacing the cleaner head built in the Pump

assembly, be careful of the following points.

n Do not touch the cleaner head with your bare hands. Use

gloves or tweezers.

n Do not smear the head cleaner with oil or grease. n When installing the cleaner head, set the rubber side (black

side) toward the right side of the frame.

n When you replacing the Cap Assembly, do not touch the

sealing rubber portion of the Cap Assembly.

n The components parts of the Pump Assembly are no

individually supplied as ASP. So please replace the whole Pump Assembly when the Pump Assembly needs replacing.

No.1 Screws securing the Pump Assembly

No.1 Screw securing the Cap Assy.

Cap Assembly

Three hooks fixing the Cap Assy.

Figure 4-14. Removing the Pump Assembly & Cap Assembly

Disassembly and Assembly Disassembly Procedures 88

EPSON Stylus COLOR 760 Revision C

CHECK

POIN T

n Since the spring is included among the gears in the pump

assembly, be careful that the parts do not pop out during disassembly and assembly.

n When assembling the Cap Assembly to the Ink System

Assembly, make sure that the Ink absorption Pad has been set into the Cap Assembly. Refer to the Figure 4-15.

n When assembling the printer, be careful not to crush nor

leave any stress on the ink tube connecting the pump assembly and the cap assembly.

n Check the ink tube is connected securely to the connect

portion of the Cap Assembly. Refer to Figure 4-16.

n Check the ink tube is placed correctly in the Ink System

Assembly. Refer to Figure 4-16.

n After installing the Pump Assembly, make sure that the

cleaner parts move back and forth by rotating the Gear.

n After setting the three protrusions of the Cap Assembly to

the suitable fixing holes on the metal frame, secure the Ink System Assembly to the Middle Frame with the screws. See Figure 4-14.

Ink Absorption Pad

about 45 degree

about 60-90 degree

Figure 4-15. Setting the Ink Absorption Pad

Cap Assembly

Pump Assembly

Ink Tube

Figure 4-16. Placing the Ink Tube in the Ink System

Disassembly and Assembly Disassembly Procedures 89

EPSON Stylus COLOR 760 Revision C

4.2.4.4 Removing th e CR Motor Assembly

1. Remove the Upper Housing. (Refer to Section 4.2.1)

2) Slide the CR Lock Lever to front with tweezers or small driver and release the CR Lock Lever from the CR unit. Then move the CR unit to the centre area of the CR shaft.

3) Loosen the CR Timing Belt by pushing the Driven Pulley Holder to right with the screw driver and remove the Timing Belt carefully from the pinion gear on the CR motor. Refer to Figure 4-17.

Driven Pulley Holder

CR Timing Belt

Figure 4-17. Removing the Timing Belt

CAUTIO N

Top Frame

No.1 Screws

CR Motor

Figure 4-18. Removing the CR Motor Assembly

n When you remove the Timing Belt from the pinion gear on

CR motor, be careful not damage the CR Encoder Slit plate.

n When you remove the CR motor through the hole of the

Top Frame, be careful not contact the pinion gear to the edge of the hole.

4) Remove two screws (No.1) while holding the CR motor and remove the CR motor assembly. Refer to Figure 4-18.

Disassembly and Assembly Disassembly Procedures 90

EPSON Stylus COLOR 760 Revision C

4.2.4.5 Removing the ASF Assembly

1. Remove the Upper H ousing. (Refer to Section 4.2.1.)

2) Remove the following Cables from the cable hook on right side (viewed from back side) of the ASF Assembly.

- ASF HP Sensor Cable

- PF Motor Cable

3) Remove two screws (No.7 and ASF fixing screw) securing the ASF unit on the Bottom Frame. Refer to Figure 4-19.

No.7 Screw

Bottom Frame

ASF Fixing Screw

Figure 4-19. Removing the ASF Assembly (1)

4) Release the hook fixing the Gear 27.2 to the ASF LD Shaft on the left of the ASF Assembly (Viewed front) and slide it left little carefully. Refer to Figure 4-20.

NOTE: Do not damage the Loop Scale when sliding the Gear 27.2 to the left. In

case the Gear 27.2 is removed in above step 4, the Loop Scale may be damaged with the Gear 27.2.

Hook for Gear 27.2

Gear 27.2

Figure 4-20. Releasing hook for the Gear 27.

5) Slide the ASF unit to the right side (viewed from back side) and pull it backward carefully while holding the Sub Paper Support Upper upward. Refer to the Figure 4-21.

Step1

Sub Paper Support Upper

Step2

Figure 4-21. Removing the ASF Assembly (2)

Disassembly and Assembly Disassembly Procedures 91

EPSON Stylus COLOR 760 Revision C

CHECK

POIN T

n When installing the ASF assembly, make sure that the

protrusion on the ASF is assembled into the fixing hole on the Middle Frame.

n Screws for ASF Assembly should be used at the following

positions. (Looking from the back of printer). Refer to Figure 4-19.

- Right Side (viewed back side): ASF Fixing Screw

- Left side (viewed back side): Screw No.7

n Make sure the ASF HP sensor cable and the PF Motor

Cable are set in the hook on the right side (viewed back side) of ASF unit. Refer to Figure 4-23.

Middle Frame

Fixing Hole

Protrusion on the ASF

Setting the ASF HP Sensor & PF Motor Cable to Hook

Figure 4-23. Setting the ASF HP Sensor & PF Motor cable

Figure 4-22. Assembling notice for ASF Assembly.

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EPSON Stylus COLOR 760 Revision C

4.2.4.5.1 Removing the Paper Feed Roller Assembly

1. Remove the ASF assembly. (Refer to Section 4.2.4.5.)

2) Release the hook on the Shaft Fixing Bushing fixing to the LD Shaft and remove the Shaft Fixing Bushing and the Right Hopper Release Lever from the right edge of the LD Roller Shaft. Refer to Figure 4-24.

Hook

Right Hopper Release Lever

Shaft Fixing Bushing

Figure 4-24.

Removing the Shaft Fixing Bushing & Right Hopper Release Lever

ASF HP Sensor Wheel

LD Roller Shaft

Left LD Roller Fixing Bushing

Hook on the ASF HP Sensor Wheel

Figure 4-25. Removing the LD Roller Fixing Bushing & ASF HP

Wheel

5) Release the Hopper Assembly fixing hooks from the protrusion on the ASF Frame at the left top corner by following the figured step.

Fixing protrusion on the ASF Frame

ASF Hopper Assembly

Step1

3) Move the left Paper Feed Roller Assembly to the center and remove the Left LD Roller Fixing Bushing (white plastic) attached to the left edge of LD

Step2

Roller Shaft. Refer to Figure 4-25.

4) Slide the LD roller shaft to the left side and remove the ASF HP Detector Wheel after releasing its hook. Refer to Figure 4-25.

Figure 4-26. Releasing the Hopper Assembly

Disassembly and Assembly Disassembly Procedures 93

EPSON Stylus COLOR 760 Revision C

6) Set the Right arm portion of the Hopper Assembly to the square hole on the right side of the ASF Frame and remove the Hopper Assembly carefully. Refer to Figure 4-27.

Right arm portion of the Hopper Assembly

Square Hole on the right side of the ASF Assembly

Figure 4-27. Setting the Right Arm of Hopper Assembly

7) Take out the right and left compression springs 1.961 between the Paper Feed Roller Assembly and the Hopper Assembly with Tweezers carefully.

8) Lift up the right side of Paper Feed Roller Assembly a little with the LD Roller Shaft, and move the LD Roller Shaft to the right. Then remove it from the left side hole the ASF Frame.

9) Remove the Left Hopper Release Lever from the left side of the LD Roller Shaft.

10) Remove the Paper Feed Roller Assembly from the LD Roller Shaft.

Figure 4-28. Disassembling the ASF Assembly

Disassembly and Assembly Disassembly Procedures 94

EPSON Stylus COLOR 760 Revision C

CHECK

POIN T

n During disassembly and assembly of the hopper assembly,

do not let the grease on the cam parts touch other parts. Wipe off any grease smeared on other parts.

n Be careful of the direction of the Hopper Release Lever

when installing it. Refer to Figure 4-29.

n When installing the right and left Paper Feed Roller

Assemblies to the LD Roller Shaft, the black Paper Feed Roller Assembly should be set on the right side.

n Make sure that gutters of back side of both Paper Feed

Roller Assembly are set on the rail on the ASF Frame. Refer to Figure 4-30.

n Make sure that the Left frame of the Paper Feed Assembly

is in the gutter of the Paper Guide. Refer to Figure 4-31.

Paper Feed Roller Assembly

Rail on the ASF & gutter portion of Paper Feed Roller Assy.

Figure 4-30. Setting the Paper Feed Roller Assembly on the Rail

Paper Guide

Gutter portion

Hopper Release Lever

Left Paper Feed Assembly

Figure 4-29. Assembling the LD Hopper Release Lever

Figure 4-31. Setting the Left Paper Feed Assembly

Disassembly and Assembly Disassembly Procedures 95

EPSON Stylus COLOR 760 Revision C

CHECK

POIN T

n Make sure that the right Paper Feed Roller

Assembly is fixed with the hook on the ASF unit. Check it from the back side of the ASF Frame. Refer to Figure 4-32.

n During assembly, when setting the compre ssio n

spring 1.961 to the spring installation position in the Paper Feed Assembly, hang the spring on the hook temporarily. Also, do not forget to release the hooks of these springs from the holes located on the back of paper feed assembly by rotating the spring. (Refer to Figure 4-33).

Fixing hook portion f or Right Paper Feed Roller Assy.

Figure 4-32. Fixing the Right Paper Feed Roller Assy.

Compression Spring 1.961

Hook portion for Compression Spring 1.961

Figure 4-33. Setting the Compression Spring 1.961

Disassembly and Assembly Disassembly Procedures 96

EPSON Stylus COLOR 760 Revision C

4.2.4.5.2 Removing the Right and Left LD Roller Assembly

1. Disassemble the ASF assembly and remove the Paper Feed Roller Assembly and Hopper Assembly from the ASF Assembly. (Refer to the Section 4.2.4.5.1)

1. Release the two hooks fixing the LD Roller Cover to the Paper Feed Roller Assembly. Refer to Figure 4-34.

2) Release the two hooks fixing the LD Roller Assembly at around the shaft hole of the Paper Feed Roller Assembly. Refer to Figure 4-34.

Hooks for the LD Roller Cover

Hooks for the LD Roller Assy.

CHECK

POIN T

n When installing the LD roller assembly, make sure that the

hooks are hung on the Paper Feed Roller Assembly.

n Do not touch the surface of the LD Roller with hand.

Figure 4-34. Releasing hooks for LD Roller

Disassembly and Assembly Disassembly Procedures 97

EPSON Stylus COLOR 760 Revision C

4.2.4.6 Removing the CR Assembly

1. Remove the Top Housing. (Refer to Section 4.2.1)

2) Remove the Tension Spring 1.494 fixing the CR Encoder Slit Plate to the protrusion on the left side of the Top Frame and remove the CR Encoder Slit Plate carefully from the CR unit.

Tension Spring 1.494

CR Encoder Slit Plate

Figure 4-35. Remove the Tension Spring 1.491& CR Encoder Slit

3) Loosen the Timing Belt by pushing the Driven Pulley Holder and remove the Timing Belt from the pinion gear of the CR motor. Refer to Figure 4-18.

4) Take the Compression Spring 23.52 out of the Driven Pulley Holder with tweezers. Refer to Figure 4-36.

Driven Pulley Holder

Compression Spring 23.52

Figure 4-36. Taking out Compression Spring 23.52

5) Slide the Driven Pulley Holder to the right side and remove it to forward.

6) Remove the Driven Pulley from the Driven Pulley Holder with the timing belt. Refer to Figure 4-37.

Driven Pulley Holder

Driven Pulley

Figure 4-37. Removing the Driven Pulley

Disassembly and Assembly Disassembly Procedures 98

EPSON Stylus COLOR 760 Revision C

7) Move the PG Lever to bring its hooks to the nothes of the cutouts in the right side of the Top Frame. Then remove the PG Lever by releasing the hooks. Refer to Figure 4-38.

PG Lever

Right of theTop Frame

Notch portion

Figure 4-38. Align the PG Lever with the Notches

8) Remove the Torsion Spring 63.7 hanging on the right side of the Top Frame and PG lever with tweezers. Refer to Figure 4-38.

9) Release the fixed hook of the PG Lever Support and remove the PG Lever Support and Disk Spring (6.2x0.15x1, S/NA) from the right edge of the CR Guide Shaft. Refer to Figure 4-38.

No.7 Screw

10) Remove one screw (No.7) and rotate the Right Parallelism Adjustment Bushing and move it forward so that the locking protrusion of the Right Parallelism Adjustment Bushing fits in the notches on the right side of the Top Frame. Refer to Figure 4-40.

Right Parallelism Adjustment Bushing

Notches on the Top Frame

Figure 4-40. Removing the Right Parallelism Adjustment Bushing

CAUTIO N

Be careful when removing the Right Parallelism Adjustment Bushing. If you remove it with the pr inthead installed, the CR Unit will fall to the platen.

Disk Spring

Torsion Spring 63.7

PG Lever Support

Figure 4-39. Removing the Torsion Spring 63.7 & PG Lever

Disassembly and Assembly Disassembly Procedures 99

EPSON Stylus COLOR 760 Revision C

11) Holding the carriage, remove the Right Parallelism Adjustment Bushing carefully by pushing it right side slightly.

12) Remove the CR Assembly with the CR Guide Shaft.

CR Assembly

CAUTIO N

ADJUSTMENT

REQUIRED

CHECK

POIN T

n Do not touch the surface of the CR Liner Scale by hand.

The dirt or stain causes the incorrect movement of the CR unit.

n Do not damage the CR Liner Scale. Handle it carefully. The

damage causes the incorrect movement of the CR unit.

n In case you forgot to mark the present location where the

Bushing is fixed on the TOP Frame, perform the PG Adjustment. Refer to the Chapter 5.

n When disassembling the Right Parallelism Adjustment

Bushing, mark present location where the Bushing is fixed on the TOP Frame so that you can omit PG adjustment after assembly.

n When installing the Disk Spring (6.2x 0.15x1,S /NA) , pay

attention to its direction. (Convex side should face the right side.) Refer to the Figure 4-39.

n When installing the PG Lever, refer to the Figure 4-47. n Make sure that the CR Liner Scale is not in contact with

either side of the slot in the CR unit after you set the CR Liner Scale into the slot. Refer to the Figure 4-41.

n Make sure that the Oil Pad is set in the suitable portion in

the CR unit when the CR unit is reassembled to the CR Guide Shaft.

CR Liner Scale

Figure 4-41. Checking the CR Encoder Slit Plate condition

Disassembly and Assembly Disassembly Procedures 100

Epson Stylus 760 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

PRODUCT DESCRIPTION

1.1 FEATURES

1.2 SPECIFICATIONS

1.2.1 Physical Specification

1.2.2 Printing Specification

1.2.3 Paper Feeding

1.2.4 Input Data Buffer

1.2.5 Electric Specification

1.2.6 Environmental Condition

1.2.7 Reliability

1.2.8 Safety Approvals

1.2.9 Acoustic Noise

1.2.10 CE Marking

1.3 INTERFACE

1.3.1 Parallel Interface (Forward Channel)

1.3.2 Parallel Interface (Reserve Channel)

1.3.3 USB Interface

1.3.4 Preventing Data Transfer Time-out of Hosts

1.3.5 Interface Selection

1.3.6 IEEE1284.4 Protocol

1.4 OPERATOR CONTROLS

1.4.1 Operating Switch

1.4.2 Control Panel

1.4.2.1 Switches

1.4.2.2 Indicators

1.4.3 Panel Functions

1.4.4 Printer Condition and Panel Status 1.4.5 Printer Initialization

1.4.6 Errors

1.5 PAPER

1.5.1 Paper Handling

1.5.2 Paper Specification

1.5.2.1 Cut Sheet

1.5.2.3 Envelope

1.5.2.2 Transparency, Glossy Paper

1.5.2.4 Index Card

1.5.3 Printing Area

1.5.3.1 Cut Sheet

1.5.3.2 Envelopes

1.6 INK CARTRIDGE

1.6.1 Black Ink Cartridge

1.6.2 Color Ink Cartridge

OPERATING PRINCIPLES

2.1 Overview

2.1.1 Printer Mechanism

2.1.1.1 P rinting Mechanism

2.1.1.2 P rinting Pro cess

2.1.1.3 Carria ge Mechanism

2.1.1.4 Platen Gap (PG) Adjust Mechanism

2.1.1.5 Paper Feeding Mechanism

2.1.1.6 CR Lock Mechanism

2.1.1.7 Paper Loading Mechanism

2.1.1.8 Pump Mechanism

2.1.1.9 Capping Mechanism

2.2 Electrical Circuit Operating Principles

2.2.1 C298PSB/PSE Board

2.2.2 C298MAIN Board

2.2.2.1 Printhead Driver Circuit

2.2.2.2 Reset Circuit

2.2.2.3 CR Motor Driver Circuit

2.2.2.4 PF Motor Driver Circuit

2.2.2.5 EEPROM Control Circuit

2.2.2.6 Sensor Circuit

TROUBLESHOOTING

3.1 Overview

3.1.1 Troubleshooting with LED Error Indications

3.1.1.1 Remedies for Paper Out Error

3.1.1.2 Remedies for the Paper Jam Error

3.1.1.3 Remedies for No I/C and Ink Out Errors

3.1.1.4 Remedies for the Maintenance Error

3.1.1.5 Remedi es for Fatal Error

3.1.2 Isolating the Faulty Part on the Power Supply Board

3.1.3 Isolating the Faulty Part according to the Phenomenon

DISASSEMBLY AND ASSEMBLY

4.1 Overview

4.1.1 Precautions for Disassembling the Printer

4.1.2 Tools