Epson L655 Service Manual

SERVICE MANUAL

Color Inkjet Printer

Epson ET-4550/3600

Epson L655/656/605/606

CONFIDENTIAL

SEMF15-002

Notice:

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

All effort have been made to ensure the accuracy of the contents of this manual. However, should any errors be detected, SEIKO EPSON would greatly appreciate being informed of them.

The contents of this manual are subject to change without notice.

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

EPSON is a registered trademark of SEIKO EPSON CORPORATION.

Note :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 2015 SEIKO EPSON CORPORATION

Printer CS Quality Assurance Department

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Safety Precautions

All safety procedures described here shall be strictly adhered to by all parties servicing and maintaining this product.

DANGER

Strictly observe the following cautions. Failure to comply could result in serious bodily injury or loss of life.

1.Always disconnect the product from the power source and peripheral devices when servicing the product or performing maintenance.

2.When performing works described in this manual, do not connect to a power source until instructed to do so. Connecting to a power source causes high voltage in the power supply unit and some electronic components even if the product power switch is off. If you need to perform the work with the power cable connected to a power source, use extreme caution to avoid electrical shock.

WARNING

Strictly observe the following cautions. Failure to comply may lead to personal injury or loss of life.

1.Always wear protective goggles for disassembly and reassembly to protect your eyes from ink in working. If any ink gets in your eyes, wash your eyes with clean water and consult a doctor immediately.

2.When using compressed air products; such as air duster, for cleaning during repair and maintenance, the use of such products containing flammable gas is prohibited.

PRECAUTIONS

Strictly observe the following cautions. Failure to comply may lead to personal injury or damage of the product.

1.Repairs on Epson product should be performed only by an Epson certified repair technician.

2.No work should be performed on this product by persons unfamiliar with basic safety knowledge required for electrician.

3.The power rating of this product is indicated on the serial number/rating plate. Never connect this product to the power source whose voltages is different from the rated voltage.

4.Replace malfunctioning components only with those components provided or approved by Epson; introduction of second-source ICs or other non-approved components may damage the product and void any applicable Epson warranty.

5.The capacitors on the Main Board may be electrically charged right after the power turns off or after driving motors which generates counter electromotive force such as when rotating the PF Roller or when moving the CR Unit. There is a risk to damage the Main Board if the Head FFC is short-circuited with the capacitors on the Main Board electrically charged, therefore, after the power turns off or after motors are driven, leave the printer untouched for approximately 30 seconds to discharge the capacitors before starting disassembly/ reassembly.

6.To prevent the circuit boards from short-circuiting, be careful about the following when handling FFC or cables.

When handling FFC, take care not to let the terminal section of FFC touch metal parts.

When connecting cables/FFC to the connectors on circuit boards, connect them straight to the connectors to avoid slant insertion.

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7.In order to protect sensitive microprocessors and circuitry, use static discharge equipment, such as anti-static wrist straps, when accessing internal components.

8.Do not tilt this product immediately after initial ink charge, especially after performing the ink charge several times. Doing so may cause ink to leak from the product because it may take some time for the waste ink pads to completely absorb ink wasted due to the ink charge.

9.Never touch the ink or wasted ink with bare hands. If ink comes into contact with your skin, wash it off with soap and water immediately. If you have a skin irritation, consult a doctor immediately.

10.When disassembling or assembling this product, make sure to wear gloves to avoid injuries from metal parts with sharp edges.

11.Use only recommended tools for disassembling, assembling or adjusting the printer.

12.Observe the specified torque when tightening screws.

13.Be extremely careful not to scratch or contaminate the following parts.

Nozzle plate of the printhead

CR Scale

PF Scale

Coated surface of the PF Roller

Gears

Rollers

LCD

Scanner Sensor

Exterior parts

14.Never use oil or grease other than those specified in this manual. Use of different types of oil or grease may damage the component or give bad influence on the printer function.

15.Apply the specified amount of grease described in this manual.

16.Make the specified adjustments when you disassemble the printer.

17.When cleaning this product, follow the procedure described in this manual.

18.When transporting this product after filling the ink in the printhead, pack the printer without removing the ink cartridges in order to prevent the printhead from drying out.

19.Make sure to install antivirus software in the computers used for the service support activities.

20.Keep the virus pattern file of antivirus software up-to-date.

21.When disassembling/reassembling this product, if you find adhesive power of the double-sided tape which secure the parts or FFC is not enough, replace the tape with new one and attach it correctly to the specified points where the parts or FFC should be secured.

22.Unless otherwise specified in this manual, the labels attached on the returned product should be transferred to the corresponding attachment positions on the new one referring to the labels on the returned product.

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About This Manual

This manual, consists of the following chapters, is intended for repair service personnel and includes information necessary for properly performing maintenance and servicing the product.

CHAPTER 1. TROUBLESHOOTING

Describes the step-by-step procedures for the troubleshooting.

CHAPTER 2. DISASSEMBLY / REASSEMBLY

Describes the disassembly/reassembly procedures for main parts/units of the product, and provides the standard operation time for servicing the product.

CHAPTER 3. ADJUSTMENT

Describes the required adjustments for servicing the product.

CHAPTER 4. MAINTENANCE

Describes maintenance items and procedures for servicing the product.

CHAPTER 5. APPENDIX

Provides the following additional information for reference:

•Connector Diagram

•Protection for Transportation

Symbols Used in this Manual

Various symbols are used throughout this manual either to provide additional information on a specific topic or to warn of possible danger present during a procedure or an action. Pay attention to all symbols when they are used, and always read explanation thoroughly and follow the instructions.

Indicates an operating or maintenance procedure, practice or condition that, if not strictly observed, could result in serious injury or loss of life.

Indicates an operating or maintenance procedure, practice, or condition that, if not strictly observed, could result in bodily injury, damage or malfunction of equipment.

May indicate an operating or maintenance procedure, practice or condition that is necessary to accomplish a task efficiently. It may also provide additional information that is related to a specific subject, or comment on the results achieved through a previous action.

For Chapter 2 “Disassembly/Reassembly”, symbols other than indicated above are used to show additional information for disassembly/reassembly. For the details on those symbols, see "2.3 Disassembly/Reassembly Procedures (p37)".

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Revision Status

Revision	Date of Issue		Description
A	May 19, 2015	First Release
B	October 19, 2015	 Chapter 2
			 "2.1.5.1 Factors which Affect the Print Quality (p28)"
			 "2.1.5.2 Factors which Affect the Safety of Service Personnel such as Ink
			Leakage during Operation (p29)"
C	May 9, 2016	 Chapter 1
		 1.1.1 Touble Shooting Workflow
			Deleted “Initial Ink Charge” (p11)
			Added “Poor Printing” “Blank Printing” (p27)
		 Chapter2
		 2.1.5 Checks and Precautions before Disassembling
			2.1.5.1 Factors Which Affect the Print Quality(P27)
			2.1.5.2 Factors Which Affect the Safety of Service Person such as Ink Leakage
			during Operation(P30)
			2.1.5.4 Discharging Procedure (P34)
		 2.3.2 Disassembly Flowchart
			CISS System(P40)
		 2.4 Detail Disassembly/Reassembly Procedure for each Part/Unit
			Ink Tank Housing Upper(P50)
			Ink End Sensor Board Holder(P50)
			Ink End Sensor Board(P50)
		 Charpt3
			Required Adjustment List(P58)
			3.3.1 Checking the Platen Gap(P64)
D	June 15, 2016	 Cover
			The New Model Name(ET-3600,L605/606) is Added in the Service Manual Cover
		 Chapter1
		 1.3 Fatal Error Code List
			The Fatal Error Code for Hexadecimal Number is Added (P14,15,16,17)

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Epson ET-4550, L655/656

Revision B

Contents

Chapter 1 Troubleshooting

1.1	Troubleshooting.......................................................................................................................................................			10
	1.1.1 Troubleshooting Workflow ............................................................................................................................			10
1.2	Power-On Sequence ................................................................................................................................................			12
1.3	Fatal Error Code List...............................................................................................................................................			14
Chapter 2 Disassembly/Reassembly
2.1	Overview		.................................................................................................................... .............................................	19
	2.1.1	Tools ...............................................................................................................................................................		19
	2.1.2	Jigs ..................................................................................................................................................................		19
	2.1.3	Locations ...........................................................................................................................of the Parts/Units		20
	2.1.4	Standard .......................................................................................Operation Time for servicing the product		24
	2.1.5	Checks ..............................................................................................and Precautions before Disassembling		27
	2.1.5.1 ..................................................................................................		Factors which Affect the Print Quality	27
	2.1.5.2 ............		Factors which Affect the Safety of Service Personnel such as Ink Leakage during Operation	28
2.2	Common .........................................................................cautions when disassembling/reassembling the Product			34
2.3	Disassembly/Reassembly .....................................................................................................................Procedures			36
	2.3.1	Functional .......................................................................differences between models and component parts		36
	2.3.2	Disassembly ...................................................................................................................................Flowchart		37
2.4	Detailed Disassembly/Reassembly ...........................................................................Procedure for each Part/Unit			44
2.5	Routing FFCs/cables ...............................................................................................................................................			50
Chapter 3 Adjustment
3.1	Required Adjustments .............................................................................................................................................			54
3.2	Adjustment ................................................................................................................................................Program			58
	3.2.1 Operating ..................................................................................................................................Environment			58
	3.2.2	Details ................................................................................................................of the Adjustment Program		58
	3.2.2.1 ..............................................		CR Motor Heat Protection Control / PF Motor Heat Protection Control	59
	3.2.2.2 ..............................................................................................................		Scanner Motor Heat Protection	59
	3.2.2.3 ............................................................................................................................MAC Address Setting			60
3.3	Details of ............................................................................................................................................Adjustments			61
	3.3.1 Checking ................................................................................................................................the Platen Gap			61
	3.3.1.1 .............................................................................................................................................		Preparation	61
	3.3.1.2 .........................................................................................................................		Confirmation procedure	63
Chapter 4 Maintenance
4.1	Cleaning...................................................................................................................................................................			65
	4.1.1	Cleaning .........................................................................................the nozzle plate section of the printhead		65
	4.1.2 Cleaning .....................................................................................................................................the CR Unit			66
	4.1.3	Cleaning ............................................................................................the Exterior Parts/inside of the printer		67
4.2	Lubrication ..............................................................................................................................................................			68
4.3	Lubrication .........................................................................................................................Points and Instructions			69
Chapter 5 Appendix
5.1	Connector Diagram .................................................................................................................................................			75
5.2	Protection ..................................................................................................................................for Transportation			76
	5.2.1 Securing ......................................................................................................................................the CR Unit			76

7

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Epson ET-4550, L655/656	Revision B
5.2.2 Securing the Stacker Assy ............................................................................................................................	77

8

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CHAPTER 1

TROUBLESHOOTING

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Epson ET-4550, L655/656

Revision B

1.1 Troubleshooting

This section describes the troubleshooting workflow.

1.1.1 Troubleshooting Workflow

The following page describes the troubleshooting workflow. Follow the flow when troubleshooting problems.

This flowchart is compiled based on the following contents.

•Our experience regarding the quality problem

•ESK’s repair data

•Printer Mechanism specification for ET-4550, L655/656

If the reason for the return is evident, first check the phenomenon user claims recurs, then proceed to the troubleshooting.

Start

Turn on the printer

Does printer turn on the power?

Yes

Is Power-on sequence finished without error?

Yes

Standby condition

Print check pattern

Is printing operation finished without error?

Yes

Is printing operation finished without trouble?

Yes

No	1
	(p 11)
No	2
	(p 11)

No	3
	(p 11)
No	4
	(p 11)

What is returned reason?	Printer failure only
ADF/Scanner
unit failure
Copy an image
Is scanning operation	No	5
finished without
trouble?		(p 11)
Yes
ADF failure?	No
Yes
Copy an image by ADF
Is ADF operation finished	No	6
without trouble?
Yes		(p 11)

Finish*

*: In case of “Not Trouble Found”, check fatal error code.

Figure 1-1. Troubleshooting Workflow (1)

Troubleshooting

Troubleshooting Workflow

10

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Epson ET-4550, L655/656

Revision B

1

The power-on

2

Error is indicated during

5

Scanning cannot be

sequence does not

power-on sequence (p 10)

performed

start (p 10)

successfully (p 10)

No Power*

Fatal error

Maintenance error

Incomplete Initial Ink Charge

Ink End error

Paper Jam error

CR Fixing Tape error

Scanner failure

[Presumable Cause]

Please refer to " 1.3 Fatal Error

[Occurrence Condition]

[Occurrence Condition]

[Occurrence Condition]

Please refer to " Paper Jam error".

[Occurrence Condition]

[Presumable Cause]

•

Power Supply Unit

Code List (p14)"for

This error occurs when

LCD and STM indicate "Initial

This error occurs when ink counter

This error occurs if a paper jam

•

Contamination of Scanner

damage

troubleshooting.

maintenance counter in

ink charging is not complete".

reaches ink end level.

occurs during the power-on

Glass

•

Main Board damage

EEPROM exceeds the specified

[Major Occurrence Timing]

[Major Occurrence Timing]

sequence before initial ink

•

Contamination of Document

•

Panel Unit damage

value.

charge.

Pad

[Major Occurrence Timing]

• Power-on timing

•

Power-on timing

[Major Occurrence Timing]

• CIS Unit bonding failure

[Major Troubleshooting]

[Major Troubleshooting]

•

Print start timing

•

CIS Unit damage

•

Power Supply Unit

•

Power-on timing

•

Paper eject timing

Power-on timing

•

Scanner Motor damage

replacement

•

Print start timing

• Perform initial ink charge

•

Cleaning timing

(before initial ink charge)

•

Main Board

•

Paper eject timing

[Major Troubleshooting]

[Major Troubleshooting]

[Major Troubleshooting]

•

replacement

•

Cleaning timing

•

Scanner Glass cleaning

Panel Unit replacement

[Major Troubleshooting]

• Refill ink and reset ink counter

Open the scanner unit and

•

Document Pad cleaning

by panel.

remove the CR fixing tape.

•

Document Pad replacement

* : If the printer can turn on but turns

•

Replace Maintenance Box

•

CIS Unit replacement

• Paper Guide Lower Porous

•

Scanner Motor replacement

off right away, the protection

Pad replacement

•

Scanner Unit replacement

circuit may cut off the power due

•

Maintenance counter reset

to an error such as a circuit

(only Paper Guide Lower

failure.

Porous Pad)

3 Error is indicated during printing nozzle check pattern (p 10)

ADF does not

4 Problems related to print result or during printing(p 10) 6 operate normally (p 10)

Paper Jam error

[Occurrence Condition]

This error occurs when top/bottom of paper is not detected by PE Sensor in the specified steps of paper feeding operation correctly.

[Major Occurrence Timing]

•Power-on timing

•Paper loading timing

•Paper eject timing

•Duplex print timing

[Major Troubleshooting]

1remove the jammed paper by opening Scanner Unit or Printer Cover.

2Push “Start” button.

3If not resolved by 2), check the following.

•Foreign material, bits of paper

•Part come-off

•PE Lever

•PE Sensor

•Float of Paper Guide Front Porous Pad

•Main Board

•PW Sensor

[NOTE]

*If an error occurs during printing, the page where the error occurred is skipped and the printing resumes from the next page.

*If an error occurs during duplex printing, the following are performed.

•If an error occurs during the front face of duplex printing, the page where the error occurred and the next page are skipped and the printing resumes from the page after the next.

•If an error occurs during the back face of duplex printing, the page where the error occurred is skipped and the printing resumes from the next page.

No Paper error

Double Feed error

No Paper Cassette error

Paper Size Unmatch error

Poor Printing

Poor Paper Loading

Abnormal Noise

ADF failure

[Occurrence Condition]

[Occurrence Condition]

[Occurrence Condition]

[Occurrence Condition]

[Phenomenon]

[Presumable Cause]

[Presumable Cause]

[Phenomenon]

This error occurs when top of

This error occurs on the following

This error occurs if one of the

This error occurs when actual

•

Poor printing quality

• Use of 3rd party media

•

Foreign material

•

No paper feed

paper is not detected by PE Sensor

cases.

cassettes is not installed.

paper size is not matched to

•

Ink stain on paper

•

Edge guide mis-setting

•

Insufficient grease

•

Double feed

in the specified steps of paper

• A paper is ejected without

[Major Occurrence Timing]

theoretical one.

•

Dot missing

•

Foreign material

•

Gear damage

•

Paper jam

loading operation correctly.

printing during paper loading

[Major Occurrence Timing]

•

Paper eject without printing

•

Part come-off

[Major Troubleshooting]

•

Paper skew

operation.

Paper loading timing

• Contamination of paper feed

[Major Occurrence Timing]

• Actual paper length is longer

(Front loading)

•

Duplex print timing

[Presumable Cause]

roller (Duplex Unit)

•

Foreign material removal

[Presumable Cause]

Paper loading timing

than theoretical one.

[Major Troubleshooting]

• FAX data print timing

•

Driver / Panel mis-setting

•

Cassette Assy damage

•

Lubrication of grease

•

Wear of Pickup Roller

[Major Occurrence Timing]

[Major Troubleshooting]

•

Contamination of CR scale

•

Pickup Roller deterioration,

•

Gear replacement

•

Wear of ADF Pad Assy

[Major Troubleshooting]

Install the Cassette Assy.

•

Contamination of Printhead

contamination

•

Gear damage

1 Put paper in cassette and push

Paper loading timing

1 Put correct sized paper in

•

Cover

• Contamination of PF roller

•

Scanner Motor damage

[Major Troubleshooting]

cassette, and push “START”

Printhead damage

[Major Troubleshooting]

• Contamination of Scanner Glass

“START” button.

button.

•

Ink clogging of Printhead

• ADF Paper Support Assy

2 If a paper stops before reaching

•

PE Lever replacement

2 If not resolved by step 1),

•

Contamination on Cap Unit /

•

Recommendation of EPSON

•

damage

PE Sensor, remove it and

•

PE Sensor replacement

•

check the following points.

•

Wiper of Inksystem Assy

•

media

Foreign material

check the paper condition.

•

PW Sensor replacement

PE Lever

Inksystem Assy damage

Edge guide re-setting

• ADF Cover Assy damage

3 A) If no damage on the paper, set

•

Main Board replacement

•

PE Sensor

•

Float of Paper Guide Front

•

Foreign material removal

• Wear of EJ Roller

edge guide correctly after

[NOTE]

•

PW Sensor

•

Porous Pad

•

Part re-installation

•

ADF Sensors damage

putting paper in cassette and

•

Main Board

Narrow PG

•

PF Roller replacement

push “PRINT” button again.

This error occurs only for manual

•

PE Lever damage

•

Cassette Assy replacement

[Major Troubleshooting]

B) If damage on the paper, check

duplex print.

•

PE Sensor damage

•

Pickup Roller replacement

• ADF Cover Assy replacement

foreign materials / parts come-

•

PW Sensor damage

• ADF Pad Assy replacement

off / parts transformation in

•

Scanner Glass cleaning

paper path.

[Major Troubleshooting]

• ADF Paper Support Assy

4 If not resolved by 3-A) & 3-B),

•

Driver / Panel re-setting

•

replacement

•

check the following.

•

CR Scale replacement

Foreign material removal

Pickup Roller

•

Printhead cover cleaning

•

Scanner Unit replacement

•

Duplex Unit

•

Printhead cleaning

•

ADF Unit replacement

•

PE Sensor

•

Refill ink

•

Main Board

•

Printhead replacement

•

PF Motor

•

Rubber cleaning of Cap Unit of

•

Casette Assy

Inksystem Assy

•

Inksystem Assy replacement

• Paper Guide Front Porous Pad

•

re-installation

PG readjustment

•

Printer Mechanism

•

replacement

PE Lever replacement

•

PE Sensor replacement

•

PW Sensor replacement

•

Main Board replacement

Figure 1-2. Troubleshooting Workflow (2)

Troubleshooting

Troubleshooting Workflow

11

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Epson ET-4550, L655/656

Revision B

1.2 Power-On Sequence

This section describes the power-on sequences for this product. The preconditions are as follows.

Power-on sequence (See Table 1-1.)

Turning on the printer after turning it off without an error.

The power was turned off normally at the previous shut down.

Initial ink charge has finished and every ink tank has sufficient ink.

No paper on the paper path.

The Printhead is capped by the cap of the Ink System and the CR Lock is engaged normally.

Table 1-1. Normal Power-on Sequence

	Operation*1			CR Unit/PF Roller
		movement and position*2
1.	Printhead initialization*3	80			HP		0
				CR Unit
	1-1.Initializes the Printhead.
					CR Lock
2.	Maintenance error detection	80			HP		0
	2-1.Checks the tube maintenance counter for ink tube errors.
	2-2.Checks the waste ink counter if the waste ink overflow is occurring.
3.	Releasing the CR lock	80			HP		0

3-1.The PF Motor rotates clockwise, and releases the CR lock.

4. Seeking the home position

80

HP 0

4-1.The CR Unit moves to the 0-digit side slowly and confirms it touches the Right Frame.

4-2.By regarding the position where the CR Unit touches the Right Frame as the specified distance from the origin, the	80					HP		0
home position is determined. Thereafter, the position of the CR Unit is monitored based on the information
provided by the CR Encoder Sensor.
4-3.The CR Unit slowly moves to its home position.	80					HP	0
4-4.The PF Roller rotates clockwise for approximately 1 second.	80					HP		0
5. Low temperature operation sequence*4	80					HP		0
5-1.The CR Unit moves between around the switch lever and in front of the Left Frame two times.

Troubleshooting

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Epson ET-4550, L655/656							Revision B
	Table 1-1. Normal Power-on Sequence
	Operation*1			CR Unit/PF Roller
		movement and position*2
	6. Adjustment of CR acceleration delay	80					HP	0
	6-1.The CR Unit moves between around the switch lever and in front of the Left Frame two times.
	6-2.The measured CR acceleration delay time is recorded in the EEPROM.	80					HP		0
	7. CR measurement	80					HP	0
	7-1.The CR Unit moves until it touches the Right Frame.
	7-2.The CR Unit slowly moves to its home position, and then moves until it touches the Right Frame again.	80					HP	0
	7-3.The CR Motor carries out the measurement drive, and the measured value is recorded in the EEPROM.	80					HP		0
	7-4.The CR Unit slowly moves to its home position	80					HP	0
	8. Ink detection and initializing the Ink System*5	80					HP	0
	8-1.The CR Unit moves slowly until it touches the Right Frame, and then moves back to its home position.

Note *1: The rotation directions of the PF Motor are as follows.

Clockwise:	Paper is fed normally
Counterclockwise:	Paper is fed backward
*2: The conditions of the CR lock are as follows.
Red	CR lock is set
White	CR lock is released

*3: If it cannot be initialized, the fatal error occurs.

*4: Executed when the detected temperature is under 5 oC (41oF) by the thermistor on the Printhead. *5: The empty suction operation may occur depending on situations.

Troubleshooting

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Epson ET-4550, L655/656

Revision B

1.3 Fatal Error Code List

This section describes the fatal error code and the possible cause for this product.

Table 1-2. Fatal Error List

	Error type	Error	Error name		Possible cause
		code
		0x01		• ADF Encoder failure (contaminated/detached scale, Encoder Board
			ADF PID excess speed error		failure)
		(100001)
				• Motor driver failure (Main Board failure)
		0x02		• ADF Encoder failure (contaminated/detached scale, Encoder Board
			ADF PID reverse error		failure)
		(100002)
				•	Paper jam
		0x03	ADF PID lock error
		(100003)		•	ADF Encoder failure (contaminated/detached scale, Encoder Board
					failure)
		0x04
			ADF PID acceleration lock error	•	Scanner Motor failure
		(100004)
				•	Paper jam
		0x05	ADF PID excess load error	•	Cable disconnection
		(100005)
		0x06	ADF PID driving time error	•	Main Board failure
		(100006)
		0x09		• ADF Encoder failure (contaminated/detached scale, Encoder Board
			ADF BS+ excess speed error		failure)
		(100009)
				• Motor driver failure (Main Board failure)
		0x0A		• ADF Encoder failure (contaminated/detached scale, Encoder Board
			ADF BS+ reverse error		failure)
		(100010)
				•	Paper jam
		0x0B	ADF BS+ lock error	•	ADF Encoder failure (contaminated/detached scale, Encoder Board
		(100011)			failure)
				•	Scanner Motor failure
		0x0D
			ADF BS+ excess load error	•	Paper jam
	ADF/Scanner	(100013)
				•	Cable disconnection
		0x0E	ADF BS+ driving time error	•	Main Board failure
		(100014)
				•	CIS Unit failure
				•	Scanner Housing failure
		0x10	HP detection failure	•	Main Board failure
		(100016)		•	Insufficient grease
				•	Foreign object
				• FFC for CIS failure / FFC for CIS connection failure
		0x11	Contact detection distance exceeded	•	CIS Unit failure
		(100017)
				• Scanner Housing failure (Including wrong attachment of the origin
		0x12	Opposite side contact detection distance		mark)
		(100018)	exceeded error	•	Main Board failure
				• FFC for CIS failure / FFC for CIS connection failure
		0x13	Wrong contact detection distance error
				•	Motor failure
		(100019)
				• Scanner drive mechanism was overloaded.
		0x14		•	Insufficient grease
			Measurement error	•	Foreign object
		(100020)
				•	Lack of gears
				• Deformation of the shaft
		0x20	LED light failure	•	CIS Unit failure
		(100032)		•	Main Board failure
		0x30	Option error	•	Main Board failure
		(100048)

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	Epson ET-4550, L655/656					Revision B
				Table 1-2. Fatal Error List
		Error type	Error	Error name		Possible cause
			code
					•	Paper jam
			0x36	Paper jam error	•	Foreign object
			(100054)		•	Loading/ejecting papers out of the standard range or curled papers
					• Using long papers (Legal or longer)
			0x41		• ADF Encoder failure (contaminated/detached scale, Encoder Board
				FB PID excess speed error		failure)
			(100065)
					• Motor driver failure (Main Board failure)
			0x42		• ADF Encoder failure (contaminated/detached scale, Encoder Board
				FB PID reverse error		failure)
			(100066)
					•	Paper jam error
			0x43	FB PID lock error	•	ADF Encoder failure (contaminated/detached scale, Encoder Board
			(100067)
						failure)
			0x44	FB PID acceleration lock error	•	Scanner Motor failure
			(100068)		•	ADF drive mechanism overload (assembling failure, foreign object,
						lubrication failure)
			0x45
				FB PID excess load error	•	Cable disconnection
			(100069)
			0x46	FB PID driving time error	•	Main Board failure
			(100070)
			0x49		• ADF Encoder failure (contaminated/detached scale, Encoder Board
				FB BS+ excess speed error		failure)
			(100073)
					• Motor driver failure (Main Board failure)
		ADF/Scanner
			0x4A		• ADF Encoder failure (contaminated/detached scale, Encoder Board
				FB BS+ reverse error		failure)
			(100074)
					•	Paper jam error
			0x4B	FB BS+ lock error	•	ADF Encoder failure (contaminated/detached scale, Encoder Board
			(100075)			failure)
					•	Scanner Motor failure
			0x4D	FB BS+ excess load error	•	ADF drive mechanism overload (assembling failure, foreign object,
			(100077)			lubrication failure)
					•	Cable disconnection
			0x4E	FB BS+ driving time error	•	Main Board failure
			(100078)
			0x51	Auto judge Fatal Error 1
			(100081)
			0x52	Auto judge Fatal Error 2
			(100082)
			0x53	Auto judge Fatal Error 3		---*
			(100083)
			0x54	Auto judge Fatal Error 4
			(100084)
			0x55	Auto judge Fatal Error 5
			(100085)
					• Carriage overload error (paper jam/foreign object)
					• Deformation of the Main Frame
					•	Ink system failure
			0x60	Home position	•	CR Motor failure
			(000096)		•	Deformation of the Front Frame
		Printer			• CR Encoder failure (contaminated/detached scale, Encoder Board
						failure)
					•	Cable disconnection
			0x68	Valve initialization timing contact
			(000104)	detection error	•	Ink system failure
			0x69	I/S clutch action timing contact detection	•	Main Board failure
			(000105)	error
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Epson ET-4550, L655/656					Revision B
			Table 1-2. Fatal Error List
	Error type	Error	Error name		Possible cause
		code
		0x6B		• PF Encoder failure (contaminated/detached scale, Encoder Board
			PF runaway error		failure)
		(000107)
				•	Motor driver failure
		0x7F	Inspection mode timing error		---*
		(000111)
		0x8D	Factor error other than printer device	This error occurs if the printer becomes a fatal error status due to a
		(000141)		failure of parts other than the printer such as the scanner or ADF.
		0x8E	Driver mismatch error	An unsupported driver was used
		(000142)
		0x8F	EEPROM verify error (by command)		---*
		(000143)
		0x93	PE Sensor error	•	PE Sensor failure
		(000147)		•	Main Board failure
		0x97	Head drive circuit excessive voltage error	•	Head FFC failure
		(000151)		•	Main Board failure
		0x9A	Circuit error (include blowout of a fuse)
		(000154)
				•	Main Board failure
		0x9B	Transistor temperature error
		(000155)
		0x9C	X-Hot detect error (pre printing)
		(000156)
		0x9D	X-Hot detect error (after flushing)	•	Printhead failure
		(000157)		•	Main Board failure
		0x9E	Head temperature error
		(000158)
	Printer
		0x9F	Printing inspection less mode error	This error occurs if the printing or manual cleaning are performed in
		(000159)		Printing inspection less mode.
				• CR Encoder failure (contaminated/detached scale, Encoder Board
		0xE1			failure)
			CR PID excess load error	•	CR Motor failure
		(000225)
				• Carriage overload error (paper jam/foreign object)
				•	Cable disconnection
				• CR Encoder failure (contaminated/detached scale, Encoder Board
		0xE2			failure)
			CR PID excess speed error	• Motor driver failure (Main Board failure)
		(000226)
				• Slipping teeth of the CR Timing Belt
				• Improper tension of the CR Timing Belt
				• CR Encoder failure (contaminated/detached scale, Encoder Board
		0xE3			failure)
			CR PID reverse error	• Slipping teeth of the CR Timing Belt
		(000227)
				• Improper tension of the CR Timing Belt
				• Carriage overload error (paper jam/foreign object)
				• CR Encoder failure (contaminated/detached scale, Encoder Board
		0xE4			failure)
			CR PID lock error	•	CR Motor failure
		(000228)
				• Carriage overload error (paper jam/foreign object)
				•	Cable disconnection
				• CR Encoder failure (contaminated/detached scale, Encoder Board
					failure)
		0xE5	CR PID speed fall error	• Motor driver failure (Main Board failure)
		(000229)		• Slipping teeth of the CR Timing Belt
				• Improper tension of the CR Timing Belt
				• Carriage overload error (paper jam/foreign object)

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	Epson ET-4550, L655/656					Revision B
				Table 1-2. Fatal Error List
		Error type	Error	Error name		Possible cause
			code
					• CR Encoder failure (contaminated/detached scale, Encoder Board
			0xE8			failure)
				CR load position reverse error	•	Slipping teeth of the CR Timing Belt
			(000232)
					• Improper tension of the CR Timing Belt
					• Carriage overload error (paper jam/foreign object)
					• CR Encoder failure (contaminated/detached scale, Encoder Board
			0xE9			failure)
				CR load position excess speed error	•	Motor driver failure (Main Board failure)
			(000233)
					• Slipping teeth of the CR Timing Belt
					• Improper tension of the CR Timing Belt
					• CR Encoder failure (contaminated/detached scale, Encoder Board
			0xEA			failure)
				CR load position excess load error	•	CR Motor failure
			(000234)
					• Carriage overload error (paper jam/foreign object)
					•	Cable disconnection
			0xEE	CR PID driving time error
			(000238)
					•	Main Board failure
			0xEF	CR load position excess driving time
			(000239)	error
					• PF Encoder failure (contaminated/detached scale, Encoder Board
			0xF1			failure)
				PF PID excess load error	•	PF Motor failure
			(000241)
					• PF drive mechanism overload (paper jam/foreign object)
					•	Cable disconnection
					• PF Encoder failure (contaminated/detached scale, Encoder Board
			0xF2	PF PID excess speed error		failure)
		Printer	(000242)		•	Motor driver failure (Main Board failure)
					• Slipping gears have occurred around the PF Motor gears.
					• PF Encoder failure (contaminated/detached scale, Encoder Board
			0xF3	PF PID reverse error		failure)
			(000243)		•	Slipping gears have occurred around the PF Motor gears.
					•	Paper jam
					• PF Encoder failure (contaminated/detached scale, Encoder Board
			0xF4			failure)
				PF PID lock error	•	PF Motor failure
			(000244)
					• PF drive mechanism overload (paper jam/foreign object)
					•	Cable disconnection
			0xF8		• PF Encoder failure (contaminated/detached scale, Encoder Board
				PF load position reverse error		failure)
			(000248)
					• Slipping gears have occurred around the PF Motor gears.
					• PF Encoder failure (contaminated/detached scale, Encoder Board
			0xF9	PF load position reverse error		failure)
			(000249)		•	Motor driver failure (Main Board failure)
					• Slipping gears have occurred around the PF Motor gears.
					• PF Encoder failure (contaminated/detached scale, Encoder Board
			0xFA			failure)
				PF load position excess load error	•	PF Motor failure
			(000250)
					• PF drive mechanism overload (paper jam/foreign object)
					•	Cable disconnection
			0xFE	PF PID driving time error
			(000254)
					•	Main Board failure
			0xFF	PF load position excess driving time error
			(000255)
		System Error	202620	WiFi error	WiFi board failure
			205102	Card board error	Card board failure
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Revision B

Note "*": Not occurs except in manufacturing process

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CHAPTER 2

DISASSEMBLY/REASSEMBLY

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Epson ET-4550, L655/656

Revision B

2.1 Overview

This chapter describes procedures for disassembling the main parts/units of ET-4550, L655/656. Unless otherwise specified, disassembled parts/units can be reassembled by reversing the disassembly procedure. See the cautions or tips for disassembly/reassembly described in "2.4 Detailed Disassembly/Reassembly Procedure for each Part/Unit (p45)".

Read the " Safety Precautions (p3)" before disassembling and reassembling.

When you have to remove units or parts that are not described in this chapter, see the exploded diagrams of SPI (Service Parts Information).

2.1.1 Tools

Use only specified tools to avoid damaging the printer.

Name		Availability	EPSON Part Code
(+) Phillips screwdriver #1		O	1080530
(+) Phillips screwdriver #2		O	---
Flathead screwdriver		O	---
Flathead Precision screwdriver #1		O	---
Tweezers		O	---
Longnose pliers		O	---
Nippers		O	---
Note 1: Some of the tools listed above are commercially available.
2: EPSON provides the tools listed with EPSON part code.
2.1.2 Jigs

	Name	Q’ty	EPSON Part Code
	Thickness gauge (1.48mm)	1	Commercially available
	Thickness gauge (1.76mm)	1	Commercially available
	Teflon tape (thickness: 0.08 mm)	1	Commercially available
	Tube clip	4	Commercially available

Disassembly/Reassembly

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Revision B

2.1.3 Locations of the Parts/Units

This section shows the locations of the main parts/units of ET-4550, L655/656.

The parts/units which can not be seen in the following pictures are indicated in dotted lines ( ).

 Exterior parts
Front	1	Right
7

	6		2	8
				9
	5	4	3

Left

Rear

13
						12	11	10
No.		Name		No.		Name
1		ADF Document Support (p39)		8		Ink Tank Unit (p39)
2		ADF Unit (p40)		9		Scanner Unit (p40)
3		Stacker Assy (p39)		10		FAX Filter Assy (p42)*
4		Panel Unit (p39)		11		Duplex Unit (p37)
5		Cassette Assy (p37)		12		Waste Ink Pad Assy (p39)
6		ADF LD Cover Assy (p39)		13		Hinge (p39)
7		ADF Pad Assy (p40)		Exterior Parts
			Figure 2-1.
Note "*":		The FAX Filter Assy is mounted only on models for some country/region.

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Revision B

 Printer mechanism

	1		2	3
	5		4
No.	Name	No.		Name
1	PE Sensor Lever Assy (p41)	4	Front Frame (p41)
2	Printhead (p39)	5	PF Roller (p43)
3	CR Unit (p43)

Figure 2-2. Printer Mechanism: Front

		1	2
			3
		5
			4
No.	Name	No.	Name
1	CR Scale & Spring (p41)	4	CR Encoder Sensor (p43)
2	CR Timing Belt (p43)	5	PW Sensor (p43)
3	Holder Board (p39)

Figure 2-3. Printer Mechanism: Right

Disassembly/Reassembly

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Revision B

1

2

3

	6	5		4
No.	Name	No.		Name
1	Main Board Assy (p41)	4		EJ Roller Gear (p41)
2	Panel FFC (p39)	5		PF Scale (p41)
3	Wireless LAN Module (p41)	6		PF Encoder (p41)

Figure 2-4. Printer Mechanism: Left

		1	2	3	4
	8	7	6	5
No.	Name		No.		Name
1	Head FFC (p39)		5	Paper Guide Upper Assy (p41)
2	Tube Guide (p39)		6	Main Frame Assy (p41)
3	Ink End Sensor FFC (p41)		7	Holder Cam Assy (p41)
4	Star Wheel Holder Assy (p41)		8	CR Motor (p43)
		Figure 2-5. Printer Mechanism: Rear

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Revision B

 Ink Tank Unit

	1		2		3
	7	6	5		4
No.	Name			No.	Name
1	Tube Guide Sheet (p44)			5	Tube Lock (p44)
2	Adapter(Bk) (p44), Adapter(C/M/Y) (p44)			6	Adapter Cover (p44)
3	Ink Supply Adapter Tube Assy (p44)			7	Tube Clamp (x3) (p44)
4	Joint (p44)

Figure 2-6. Ink Tank Unit (1)

Front	1	Rear	5	6

4			3	2		8	7
	No.		Name		No.	Name
1			Ink Tank Cover (p39)		5	Ink Supply Tank (C/M/Y) (p44)
2			Ink Tank Housing Upper (p44)		6	Ink End Sensor Assy (p44)
3			Cap Tank (p44)		7	Ink Supply Tank (Bk) (p44)
4			Ink Tank Housing Lower (p44)		8	Ink Supply Tank Tube Assy (p44)
				Figure 2-7. Ink	Tank	Unit (2)
Disassembly/Reassembly				Overview			24

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