Epson 760 Service manual

EPSON

EPSON France S.A.

Stylus COLOR 760

SERVICE MANUAL

PRODUIT

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)

90 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

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