Epson Stylus 760 Service Manual

SERVICE MANUAL

Color ink jet printer

EPSON Stylus COLOR 760

®

SEIJ99004

EPSON Stylus COLOR 760

Revision C

Notice:

nAll rights reserved. No part of this manual may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SEIKO EPSON CORPORATION.

nThe contents of this manual are subject to change without notice.

nAll 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.

nThe above not withstanding SEIKO EPSON CORPORATION can assume no responsibility for any errors in this manual or the consequences thereof.

EPSON is a registered trademark of SEIKO EPSON CORPORATION.

General Notice: Other product names used herein are for identification purpose only and may be trademarks or registered trademarks of their respective owners. EPSON disclaims any and all rights in those marks.

Copyright © 1999 SEIKO EPSON CORPORATION. Printed in Japan.

2

EPSON Stylus COLOR 760

Revision C

PRECAUTIONS

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

DANGER	Signals a precaution which, if ignored, could result in serious or fatal personal injury. Great caution should be exercised in
	performing procedures preceded by DANGER Headings.
WARNING	Signals a precaution which, if ignored, could result in damage to equipment.

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

DANGER

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

2.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 ANTISTATIC 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.

3

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 are intended for the experienced repair technicians, and attention should be given to the precautions on the preceding page. The chapters are organized 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

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EPSON Stylus COLOR 760

Revision C

Revision Status

Revision		Issued Date		Description
A		August 17, 1999		First Release
B		October 5, 1999		Second release
				Change has been made due to overall review of the manual.
				Third Release
C		November 25,1999		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.

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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

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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

26

C H A P T E R

PRODUCT DESCRIPTION

EPSON Stylus COLOR 760

Revision C

1.1 FEATURES

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

oHigh Color Print Quality

n 1440 (H) X 720 (V) dpi printing n Four Color Printing (YMCK)

n Traditional and New Microweave

oBuilt-in Auto Sheet Feeder

n Holds 100 cut-sheets (64g/m2) n Holds 10 envelopes

n Holds 30 transparency films

oTwo Built-in Interfaces

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

oWindows/Macintosh exclusive

PRODUCT DESCRIPTION

FEATURES

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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

oPrint Method

n On demand ink jet

oNozzle Configuration

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

oPrint Direction

n Bi-direction with logic seeking

oPrint 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.

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		23.8/19 IPS
720 dpi		8.26 inches		5952		19 IPS

oControl Code

n ESC/P Raster command n EPSON Remote command

oCharacter Tables

n Two international character sets:

-PC 437 (US, Standard Europe)

-PC 850 (Multilingual)

oTypeface

n Bit map LQ font: EPSON Courier 10 CPI

1.2.3 Paper Feeding

oFeed Method

n Friction feed with ASF

oPaper Path

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

oFeed 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

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

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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 °C and 120 hours at 60 °C
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
Humidity (%)	60
	50
	40
	30
	20
	10	20	27	30	35	40

Temperature (°C)

Figure 1-1. Temperature / Humidity of Range

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

PRODUCT DESCRIPTION

SPECIFICATIONS

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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.

DATA

data byte n

data byte n+1

	thold
-STROBE			tnext
tsetup	tstb
BUSY
tready	tbusy
-ACKNLG
	treply	tack	tnbusy

Figure 1-2. Data Transmission Timing

BUSY signal is at high level in the following cases:

nDuring data entry (see data transmission timing)

nWhen input data buffer is full

nDuring -INIT signal is at low level or during hardware initialization

nDuring printer error (see -ERROR signal)

nWhen the parallel interface is not selected

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

nPrinter hardware error (fatal error)

nPaper-out error

nPaper-jam error

nInk-out error

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

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		-
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

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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 Compatible (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.		Signal		Return		In/Out		Functional Description
		Name		GND Pin
								The strobe pulse. Read-in of data is
1		-STROBE		19		In		performed at the falling edge of this
								pulse.
2		DATA0		20		In
3		DATA1		21		In
								The DATA0 through DATA7 signals
4		DATA2		22		In
								represent data bits 0 to 7,
5		DATA3		23		In
								respectively.
6		DATA4		24		In		Each signal is at high level when data
								is logical 1 and low level when data is
7		DATA5		25		In
								logical 0.
8		DATA6		26		In
9		DATA7		27		In
10		-ACKNLG		28		Out		This signal is a negative pulse
								indicating that the printer can accept
								data again.
11		BUSY		29		Out		A high signal indicates that the printer
								cannot receive data.
12		PE		28		Out		A high signal indicates paper-out
								error.
13		SLCT		28		Out		Always at high level when the printer
								is powered on.
14		-AFXT		30		In		Not used.
								The falling edge of a negative pulse
31		-INIT		30		In		or a low signal on this line causes the
								printer to initialize. Minimum 50us
								pulse is necessary.
32		-ERROR		29		Out		A low signal indicates printer error
								condition.
36		-SLIN		30		In		Not used.

PRODUCT DESCRIPTION

INTERFACE

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EPSON Stylus COLOR 760									Revision C
Table 1-6. Connector Pin Assignment and Signals (continued)
Pin No.		Signal		Return		In/Out		Functional Description
		Name		GND Pin
18		Logic H		-		Out		Pulled up to +5V via 3.9K ohm
								resistor.
35		+5V		-		Out		Pulled up to +5V via 3.3K ohm
								resistor.
17		Chassis		-		-		Chassis GND
		GND
16,33,		GND		-		-		Signal GND
19-30
15,34		NC		-		-		Not connected

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.		Signal		Return		In/Out		Functional Description
		Name		GND Pin
1		HostClk		19		In		Host clock signal.
2		DATA0		20		In
								The DATA0 through DATA7 signals
3		DATA1		21		In
								represent data bits 0 to 7,
4		DATA2		22		In
								respectively.
5		DATA3		23		In		Each signal is at high level when data
								is logical 1 and low level when data is
6		DATA4		24		In
								logical 0.
7		DATA5		25		In		These signals are used to transfer
								the 1284 extensibility request values
8		DATA6		26		In
								to the printer.
9		DATA7		27		In
10		PtrClk		28		Out		Printer clock signal.
11		PtrBusy /		29		Out		Printer busy signal and reverse
		DataBit-3,7						channel transfer data bit 3 or 7.
12		AckDataReq		28		Out		Acknowledge data request signal
								and reverse channel transfer data bit
		/ DataBit-2,6
								2 or 6.
13		Xflag /		28		Out		X-flag signal and reverse channel
		DataBit-1,5						transfer data bit 1 or 5.
14		HostBusy		30		In		Host busy signal.
31		-INIT		30		In		Not used.

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

Pin No.		Signal		Return		In/Out		Functional Description
		Name		GND Pin
32		-DataAvail /		29		Out		Data available signal and reverse
		DataBit-0,4						channel transfer data bit 0 or 4.
36		1284-Active		30		In		1284 active signal.
18		Logic-H		-		Out		Pulled up to +5V via 3.9K ohm
								resistor.
35		+5V		-		Out		Pulled up to +5V via 3.3K ohm
								resistor.
17		Chassis		-		-		Chassis GND
		GND
16,33,		GND		-		-		Signal GND
19-30
15,34		NC		-		-		Not connected

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

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.

PRODUCT DESCRIPTION

INTERFACE

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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
1		VCC		-		Cable power. Max. power consumption is
						2mA.
2		-Data		Bi-D		Data
3		+Data		Bi-D		Data, pull up to +3.3 V via 1.5K ohm
						resistor.
4		Ground		-		Cable ground

Pin #2 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 continuously when the input buffer 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.

oAutomatic 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.

oInterface 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.

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.

oAutomatic Selection

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

oOn

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.

oOff

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

PRODUCT DESCRIPTION

INTERFACE

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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.

3		4		2		1

Figure 1-4. Control Panel

PRODUCT DESCRIPTION

OPERATOR CONTROLS

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EPSON Stylus COLOR 760

Revision C

1.4.3 Panel Functions

		Table 1-9. Panel Functions
Switch		Function
Load / Eject		• Loads or ejects a paper.
(Push for less than		• When the carriage is on the ink cartridge replacement
2 sec.*)		position, return the carriage to the capping position.
Load / Eject		• Starts the ink cartridge replacement sequence.**
(Push for 2 sec.*)		• Moves the carriage to the cartridge replacement position.
Cleaning		• Starts cleaning of the printhead.
		• In the condition of “Ink Low”, “Ink Out”, or “No Ink Cartridge”,
(Push for 2 sec.*)
		starts the ink cartridge replacement sequence.**
Cleaning		• When the carriage is on the ink cartridge replacement
(Push for less than		position, return the carriage to the capping position.
2 sec.*)

* It is described in the user’s manual that three seconds are required.

**This function is not available in printing status.

Table 1-10. Panel Function with Power On

Switch		Pressing with Power On Function
Load / Eject		• 1) Starts status printing. *1
Cleaning		• Changes code pages / Select IEEE1284.4
		mode for parallel I/F. *2
Load/Eject		• Enters the special settings mode. (Factory use
+		only). *3
Cleaning

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

Content of 1BH of		Action
EEPROM, [bit7] [bit6]
00		Print firmware version, ink counter, selected
		code page and nozzle check pattern.
11
01		Start hex-dump printing.
10		Start self test printing.

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

Table 1-11. Special Setting Mode

Switch			Function
Load / Eject		•	Initialize EEPROM and reset timer IC.
Cleaning		•	Reset the ink overflow counter in EEPROM.
(Push for 10 seconds)

PRODUCT DESCRIPTION

OPERATOR CONTROLS

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EPSON Stylus COLOR 760

Revision C

1.4.4 Printer Condition and Panel Status

Table 1-12. Printer Condition and LED Status

				Indicators
Printer Status										Priority
		Power		Ink Out		Ink Out		Paper Out
				(Black)		(Color)
Power On Condition		On		-		-		-		9
Ink Sequence		Blink		-		-		-		6
Ink Cartridge		Blink		-		-		-		5
Replacement Mode
Data Processing		Blink		-		-		-		8
Paper Out		-		-		-		On		4
Paper Jam Condition		-		Off		Off		Blink		3
No Ink Cartridge /		-		On		-		-		7
Ink End (Black)
Ink Level Low (Black)		-		Blink		-		-		7
No Ink Cartridge or		-		-		On		-		7
Ink End (Color)
Ink Level Low (Color)		-		-		Blink		-		7
Enter EEPROM and		-		ON (for 1 second only)						-
Timer IC Reset
Maintenance		Blink		Blink		Blink		Blink		2
Request
Fatal Error		Blink		On		On		Blink		1

1.4.5 Printer Initialization

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

1.Power-on Initialization

This printer is initialized when turning the printer power on, or printer 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 interface.

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 initialize the printer.

When printer is initialized, the following actions are performed:

(a)Clears print buffer.

(b)Sets default values.

PRODUCT DESCRIPTION

OPERATOR CONTROLS

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EPSON Stylus COLOR 760

Revision C

1.4.6 Errors

oInk 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.

oPaper Out

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

oPaper Jam

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

oNo Ink-Cartridge

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

oMaintenance 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.

oFatal Errors

Carriage control error or CG access error.

PRODUCT DESCRIPTION

OPERATOR CONTROLS

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

[Quality]

Exclusive paper, Bond paper, PPC

1.5.2.2 Transparency, Glossy Paper

[Size]
A4:	Width 210mm (8.3”) x Length 297mm (11.7”)
Letter:	Width 216mm (8.5”) x Length 279mm (11.0”)

[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.

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”)

[Thickness]

Less than 0.23mm (0.0091”)

PRODUCT DESCRIPTION

PAPER

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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.

PW
LM	RM
	TM
Printable Area	PL
	BM

Figure 1-5. Printable Area for Cut Sheet

Table 1-13. Character Mode

Paper		Left Margin		Right Margin		Top Margin		Bottom Margin
Size		(min.)		(min.)		(min.)		(min.)
A4		3mm (0.12”)		3mm (0.12”)		3mm (0.12”)		14mm (0.54”) /3mm
								(0.12”)*
Letter		3mm (0.12”)		9mm (0.35”)		3mm (0.12”)		14 mm (0.54”) / 3mm
								(0.12”)*
B5		3mm (0.12”)		3 m (0.12”)		3mm (0.12”)		14 mm (0.54”) / 3mm
								(0.12”)*
Legal		3mm (0.12”)		9mm (0.35”)		3mm (0.12”)		14 mm (0.54”) / 3mm
								(0.12”)*
Statement		3mm (0.12”)		3mm (0.12”)		3mm (0.12”)		14 mm (0.54”) / 3mm
								(0.12”)*
Executive		3mm (0.12”)		3mm (0.12”)		3mm (0.12”)		14 mm (0.54”) / 3mm
								(0.12”)*

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

Table 1-14. Raster Graphics Mode

Paper		Left Margin		Right Margin		Top Margin		Bottom Margin
Size		(min.)		(min.)		(min.)		(min.)
A4		3 mm (0.12”)		3 mm (0.12”)		3 mm (0.12”)		14 mm (0.54”) / 3mm
								(0.12”)*
Letter		3 mm (0.12”)		3 mm (0.12”)		3 mm (0.12”)		14 mm (0.54”) / 3mm
								(0.12”)*
B5		3 mm (0.12”)		3 mm (0.12”)		3 mm (0.12”)		14 mm (0.54”) / 3mm
								(0.12”)*
Legal		3 mm (0.12”)		3 mm (0.12”)		3 mm (0.12”)		14 mm (0.54”) / 3mm
								(0.12”)*
Statement		3 mm (0.12”)		3 mm (0.12”)		3 mm (0.12”)		14 mm (0.54”) / 3mm
								(0.12”)*
Exclusive		3 mm (0.12”)		3 mm (0.12”)		3 mm (0.12”)		14 mm (0.54”) / 3mm
								(0.12”)*

*Bottom margin is reduced to 3mm when paper dimension is defined by using the command. However, print in the extra printable area may scramble. Note the bottom margin remains 14 mm without the command.

PRODUCT DESCRIPTION

PAPER

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EPSON Stylus COLOR 760

Revision C

1.5.3.2	Envelopes
LM	RM
	TM
	Printable Area
	BM

Figure 1-6. Printable Area for Envelopes

Table 1-15. Envelope Margin

Size		Left Margin		Right Margin		Top Margin		Bottom Margin
		(min.)		(min.)		(min.)		(min.)
#10		3 mm (0.12”)		28 mm (1.10”)		3 mm (0.12”)		14 mm (0.55”)
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

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EPSON Stylus COLOR 760

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 oC to 40 oC (within a month at 40 oC)
Packing:		-30 oC to 40 oC (within a month at 40 oC)
Transit:		-30 oC to 60 oC (within 120 hours at 60 oC
		and within a month at 40 oC)
Dimension:		27.8 mm (W) x 52.7 mm (D) x 38.5 mm (H)
	27.8

52.7	51.2

38.5

26.3

Figure 1-7. Black Ink Cartridge

								Revision C
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 oC to 40 oC (within a month at 40 oC)
Packing:	-30 oC to 40 oC (within a month at 40 oC)
Transit:	-30 oC to 60 oC (within 120 hours at 60 oC
	and within a month at 40 oC)
Dimension:	42.9 mm (W) x 52.7 mm (D) x 38.5 mm (H)
				43.2

52.7					51.2
42.9
					38.5

41.4

Figure 1-8. Color 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° C environment; however, it will be usable after placing it at room temperature for more than three hours.

PRODUCT DESCRIPTION

INK CARTRIDGE

26

C H A P T E R

OPERATING PRINCIPLES

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:

o Main board:	C298MAIN Board
o Power supply board:	C298PSB/PSE Board
o Panel board:	C298PNL Board

2.1.1 Printer Mechanism

Unlike other EPSON ink jet printers, the Stylus COLOR 760 uses DC motor for 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

	Motor Name	Type	Application / Feature
			Used to drive the carriage making little noise. A
	CR 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.
	PF Motor	DC with brush	• Drive CR Lock lever
			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.

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				Loop Scale
PF Motor Pinion						PF Drive Gear (high precision)

ASF Sensor

PF Motor	Detector Wheel
Flashing Window
(80th column)	Loading Shaft
Star Wheel roller	Photo Interrupter
	(Encoder)
Bk I/C Sensor
CMY I/C Sensor	Loading Rollers
Carriage Unit
Printhead (one unit)
Timing Belt
Cap Unit	PE Sensor
(without a valve)

Liner Scale

Pump Unit
CR Guide Shaft	CR Motor (DC motor)
PF Roller	PG Lever

Figure 2-1. Printer Mechanism Block Diagram

Operating Principles

Overview

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EPSON Stylus COLOR 760

Revision C

2.1.1.1 Printing 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 U- CHIP 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.

oPZT

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 which has ink stored to discharge the ink from each nozzle on the nozzle plate.

oCavity 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.

oNozzle Plate

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

oFilter

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.

I/C Sensor Actuator

Nozzle Selector Board

Ink Cartridge

Needle

		Filter
Nozzle Plate	PZT	Cavity

Figure 2-2. Printing Mechanism

Operating Principles

Overview

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EPSON Stylus COLOR 760

Revision C

2.1.1.2 Printing Process

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 State:

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

PZT

Cavity

Nozzle

Nozzle Plate

Figure 2-3. Print Head Normal State

Figure 2-4. Print Head Ejecting State

Operating Principles

Overview

30