Epson L655 Service Manual

SERVICE MANUAL

Color Inkjet Printer

Epson ET-4550/3600

Epson L655/656/605/606

CONFIDENTIAL

SEMF15-002

Notice:

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 r egistered

trademarks of their respective owners. EPSON disclaims any and all rights in those marks.

Printer CS Quality Assurance Department

Confidential

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, fo r 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.

Confidential

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 manua l .

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.

Confidential

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)".

Confidential

Revision Status

Revision Date of Issue Description

A May 19, 2015 First Release B October 19, 2015

C May 9, 2016

D June 15, 2016

 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)"

 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)

 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)

Confidential

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 O verview ................................................................................................................................................................. 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 F actors which Affect th e Print Qu ality .................................................................................................. 27

2.1.5.2 F actors which Affect th e Safety of Servi ce Personnel such as Ink Leakage during Operation ............ 28

2.2 Common cautions when disassembling/reassembling the Product......................................................................... 34

2.3 D isassembly/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 O perating 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 D etails 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 P rotection for Transportation .................................................................................................................................. 76

5.2.1 Securing the CR Unit.................................................... ... ..................................... .......................................... 76

Confidential

Epson ET-4550, L655/656 Revision B

5.2.2 Securing the Stacker Assy ............................................................................................................................ 77

Confidential

CHAPTER 1

TROUBLESHOOTING

Confidential

Epson ET-4550, L655/656

 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.

What is returned reason?

Standby condition

Is printing operation

finished without error?

Start

Turn on the printer

(p 11)

Copy an image

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

(p 11)

ADF/Scanner

unit failure

Printer failure only

Yes

Does printer turn on the

power?

Is Power-on sequence

finished without error?

Print check pattern

Is printing operation

finished without trouble?

Is scanning operation

finished without

trouble?

Is ADF operation finished

without trouble?

Copy an image by ADF

ADF failure?

Finish

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.

Revision B

Figure 1-1. Troubleshooting Workflow (1)

Troubleshooting Troubleshooting Workflow 10

Confidential

Epson ET-4550, L655/656 Revision B

The power-on

sequence does not start (p 10)

No Power

[Presumable Cause]

• Power Supply Unit damage

• Main Board damage

• Panel Unit damage

[Major Troubleshooting]

• Power Supply Unit replacement

• Main Board replacement

• Panel Unit replacement

* : If the printer can turn on but turns

off right away, the protection circuit may cut off the power due to an error such as a circuit failure.

Please refer to " 1.3 Fatal Error

Code List (p14)"for

troubleshooting.

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

Fatal error

Error is indicated during power-on sequence (p 10)

Maintenance error

[Occurrence Condition]

This error occurs when maintenance counter in EEPROM exceeds the specified value.

[Major Occurrence Timing]

• Power-on timing

• Print start timing

• Paper eject timing

• Cleaning timing

[Major Troubleshooting]

• Replace Maintenance Box

• Paper Guide Lower Porous Pad replacement

• Maintenance counter reset (only Paper Guide Lower Porous Pad)

Incomplete Initial Ink Charge

[Occurrence Condition]

LCD and STM indicate "Initial ink charging is not complete".

[Major Occurrence Timing]

• Power-on timing

[Major Troubleshooting]

• Perform initial ink charge

Ink End error

[Occurrence Condition]

This error occurs when ink counter reaches ink end level.

[Major Occurrence Timing]

• Power-on timing

• Print start timing

• Paper eject timing

• Cleaning timing

[Major Troubleshooting]

• Refill ink and reset ink counter by panel.

Paper Jam error

Please refer to " Paper Jam error".

CR Fixing Tape error

[Occurrence Condition]

This error occurs if a paper jam occurs during the power-on sequence before initial ink charge.

[Major Occurrence Timing]

Power-on timing (before initial ink charge)

[Major Troubleshooting]

Open the scanner unit and remove the CR fixing tape.

Problems related to print result or during printing(p 10)

Scanning cannot be performed

successfully (p 10)

Scanner failure

[Presumable Cause]

• Contamination of Scanner Glass

• Contamination of Document Pad

• CIS Unit bonding failure

• CIS Unit damage

• Scanner Motor damage

[Major Troubleshooting]

• Scanner Glass cleaning

• Document Pad cleaning

• Document Pad replacement

• CIS Unit replacement

• Scanner Motor replacement

• Scanner Unit replacement

ADF does not 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 timin g

• Duplex print timing

[Major Troubleshooting]

1 remove the jammed paper by opening

Scanner Unit or Printer Cover. 2 Push “Start” button. 3 If 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

[Occurrence Condition]

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

[Major Occurrence Timing]

Paper loading timing

[Major Troubleshooting]

1 Put paper in cassette and push

“START” button.

2 If a paper stops before reaching

PE Sensor, remove it and check the paper condition.

3 A) If no damage on the paper, s et

edge guide correctly after putting paper in ca ssette and push “PRINT” button again. B) If damage on the paper, check foreign materials / parts come off / parts transforma tion in paper path.

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

check the following.

• Pickup Roller

• Duplex Unit

• PE Sensor

• Main Board

• PF Motor

• Casette Assy

Double Feed error

[Occurrence Condition]

This error occurs on the following cases.

• A paper is ejected without printing during paper loading operation.

• Actual paper length is longer than theoretical one.

[Major Occurrence Timing]

Paper loading timing

[Major Troubleshooting]

• PE Lever replacement

• PE Sensor replacement

• PW Sensor replacement

• Main Board replacement

[NOTE]

This error occurs only for manual duplex print.

No Paper Cassette error

[Occurrence Condition]

This error occurs if one of the cassettes is not installed.

[Major Occurrence Timing]

Paper loading timing (Front loading)

[Major Troubleshooting]

Install the Cassette Assy.

Paper Size Unmatch error

[Occurrence Condition]

This error occurs when actual paper size is not matched to theoretical one.

[Major Occurrence Timing]

• Duplex print timing

• FAX data print timing

[Major Troubleshooting]

1 Put correct sized paper in

cassette, and push “START” button.

2 If not resolved by step 1),

check the following points.

• PE Lever

•PE Sensor

• PW Sensor

• Main Board

Poor Printing

[Phenomenon]

• Poor printing quality

• Ink stain on paper

• Dot missing

• Paper eject without printing

[Presumable Cause]

• Driver / Panel mis-setting

• Contamination of CR scale

• Contamination of Printhead Cover

• Printhead damage

• Ink clogging of Printhead

• Contamination on Cap Unit / Wiper of Inksystem Assy

• Inksystem Assy damage

• Float of Paper Guide Front Porous Pad

• Narrow PG

• PE Lever damage

• PE Sensor damage

• PW Sensor damage

[Major Troubleshooting]

• Driver / Panel re-setting

• CR Scale replacement

• Printhead cover cleaning

• Printhead cleaning

• Refill ink

• Printhead replacement

• Rubber cleaning of Cap Unit of 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

Poor Paper Loading

[Presumable Cause]

• Use of 3rd party media

• Edge guide mis-setting

• Foreign material

• Part come-off

• Contamination of paper feed roller (Duplex Unit)

• Cassette Assy damage

• Pickup Roller deterioration, contamination

• Contamination of PF roller

[Major Troubleshooting]

• Recommendation of EPSON media

• Edge guide re-setting

• Foreign material removal

• Part re-installat ion

• PF Roller replacement

• Cassette Assy replacement

• Pickup Roller replacement

Abnormal Noise

[Presumable Cause]

• Foreign material

• Insufficient grease

• Gear damage

[Major Troubleshooting]

• Foreign material removal

• Lubrication of grease

• Gear replacement

ADF failure

[Phenomenon]

• No paper feed

• Double feed

• Paper jam

• Paper skew

[Presumable Cause]

• Wear of Pickup Roller

• Wear of ADF Pad Assy

• Gear damage

• Scanner Motor damage

• Contamination of Scanner Glass

• ADF Paper Support Assy damage

• Foreign material

• ADF Cover Assy damage

• Wear of EJ Roller

• ADF Sensors damage

[Major Troubleshooting]

• ADF Cover Assy replacement

• ADF Pad Assy replacement

• Scanner Glass cleaning

• ADF Paper Support Assy replacement

• Foreign material removal

• Scanner Unit replacement

• ADF Unit replacement

Figure 1-2. Troubleshooting Workflow (2)

Troubleshooting Troubleshooting Workflow 11

Confidential

Epson ET-4550, L655/656 Revision B

080

CRLock

CRUnit

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

CR Unit/PF Roller

movement and position

1. Printhead initialization

1-1.Initializes the Printhead.

Operation

2. Maintenance error de tec t ion

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

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

4. Seeking the home position

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

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.

4-4.The PF Roller rotates clockwise for approximately 1 second.

5. Low temperature operation sequence

5-1.The CR Unit moves between around the switch lever and in front of the Left Frame two times.

080 HP

Troubleshooting 12

Confidential

Epson ET-4550, L655/656 Revision B

Table 1-1. Normal Power-on Sequence

Operation

6. Adjustment of CR acceleration delay

6-1.The CR Unit moves between around the switch lever and in front of the Left Frame two times.

CR Unit/PF Roller

movement and position

080 HP

6-2.The measured CR acceleration delay time is recorded in the EEPROM.

7. CR measurement

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.

7-3.The CR Motor carries out the measurement drive, and the measured value is recorded in the EEPROM.

7-4.The CR Unit slowly moves to its home position

8. Ink detection and initializing the Ink System

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

C (41oF) by the thermistor on the Printhead.

*5: The empty suction operation may occur depending on situations.

080 HP

Troubleshooting 13

Confidential

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

ADF/Scanner

Error

code

0x01 (100001)

0x02 (100002)

0x03 (100003)

0x04 (100004)

0x05 (100005)

0x06 (100006)

0x09 (100009)

0x0A (100010)

0x0B (100011)

0x0D (100013)

0x0E (100014)

0x10 (100016)

0x11 (100017)

0x12 (100018)

0x13 (100019)

0x14 (100020)

0x20 (100032)

0x30 (100048)

Error name Possible cause

• ADF Encoder failure (contaminated/detached scale, Encoder Board

ADF PID excess speed error

ADF PID reverse error

ADF PID lock error

ADF PID acceleration lock error

ADF PID excess load error

ADF PID driving time error • Main Board failure

ADF BS+ excess speed error

ADF BS+ reverse error

ADF BS+ lock error

ADF BS+ excess load error

ADF BS+ driving time error • Main Board failure

HP detection failure

Contact detection distance exceeded

Opposite side contact detection distance exceeded error

Wrong contact detection distance error

Measurement error

LED light failure

Option error • Main Board failure

failure)

• Motor driver failure (Main Board failure)

• ADF Encoder failure (contaminated/detached scale, Encoder Board failure)

•Paper jam

• ADF Encoder failure (contaminated/detached scale, Encoder Board failure)

• Scanner Motor failure

•Paper jam

• Cable disconnection

• ADF Encoder failure (contaminated/detached scale, Encoder Board failure)

• Motor driver failure (Main Board failure)

• ADF Encoder failure (contaminated/detached scale, Encoder Board failure)

•Paper jam

• ADF Encoder failure (contaminated/detached scale, Encoder Board failure)

• Scanner Motor failure

•Paper jam

• Cable disconnection

• CIS Unit failure

• Scanner Housing failure

• Main Board failure

• Insufficient grease

• Foreign object

• FFC for CIS failure / FFC for CIS connection failure

• CIS Unit failure

• Scanner Housing failure (Including wrong attachment of the origin mark)

• Main Board failure

• FFC for CIS failure / FFC for CIS connection failure

• Motor failure

• Scanner drive mechanism was overloaded.

• Insufficient grease

• Foreign object

• Lack of gears

• Deformation of the shaft

• CIS Unit failure

• Main Board failure

Troubleshooting 14

Confidential

Epson ET-4550, L655/656 Revision B

Table 1-2. Fatal Error List

Error type

ADF/Scanner

Printer

Error

code

0x36 (100054)

0x41 (100065)

0x42 (100066)

0x43 (100067)

0x44 (100068)

0x45 (100069)

0x46 (100070)

0x49 (100073)

0x4A (100074)

0x4B (100075)

0x4D (100077)

0x4E (100078)

0x51 (100081)

0x52 (100082)

0x53 (100083)

0x54 (100084)

0x55 (100085)

0x60 (000096)

0x68 (000104)

0x69 (000105)

Error name Possible cause

•Paper jam

Paper jam error

FB PID excess speed error

FB PID reverse error

FB PID lock error • ADF Encoder failure (contaminated/detached scale, Encoder Board

FB PID acceleration lock error

FB PID excess load error

FB PID driving time error • Main Board failure

FB BS+ excess speed error

FB BS+ reverse error

FB BS+ lock error

FB BS+ excess load error

FB BS+ driving time error • Main Board failure

Auto judge Fatal Error 1

Auto judge Fatal Error 2

Auto judge Fatal Error 3

Auto judge Fatal Error 4

Auto judge Fatal Error 5

Home position

Valve initialization timing contact detection error

I/S clutch action timing contact detection error

• Foreign object

• Loading/ejecting papers out of the standard range or curled papers

• Using long papers (Legal or longer)

• ADF Encoder failure (contaminated/detached scale, Encoder Board failure)

• Motor driver failure (Main Board failure)

• ADF Encoder failure (contaminated/detached scale, Encoder Board failure)

• Paper jam error

failure)

• Scanner Motor failure

• ADF drive mechanism overload (assembling failure, foreign object, lubrication failure)

• Cable disconnection

• ADF Encoder failure (contaminated/detached scale, Encoder Board failure)

• Motor driver failure (Main Board failure)

• ADF Encoder failure (contaminated/detached scale, Encoder Board failure)

• Paper jam error

• ADF Encoder failure (contaminated/detached scale, Encoder Board failure)

• Scanner Motor failure

• ADF drive mechanism overload (assembling failure, foreign object, lubrication failure)

• Cable disconnection

---*

• Carriage overload error (paper jam/foreign object)

• Deformation of the Main Frame

• Ink system failure

• CR Motor failure

• Deformation of the Front Frame

• CR Encoder failure (contaminated/detached scale, Encoder Board failure)

• Cable disconnection

• Ink system failure

• Main Board failure

Troubleshooting 15

Confidential

Epson ET-4550, L655/656 Revision B

Table 1-2. Fatal Error List

Error type

Printer

Error

code

0x6B (000107)

0x7F (000111)

0x8D (000141)

0x8E (000142)

0x8F (000143)

0x93 (000147)

0x97 (000151)

0x9A (000154)

0x9B (000155)

0x9C (000156)

0x9D (000157)

0x9E (000158)

0x9F (000159)

0xE1 (000225)

0xE2 (000226)

0xE3 (000227)

0xE4 (000228)

0xE5 (000229)

Error name Possible cause

• PF Encoder failure (contaminated/detached scale, Encoder Board

PF runaway error

Inspection mode timing error

Factor error other than printer device

Driver mismatch error An unsupported driver was used

EEPROM verify error (by command)

PE Sensor error

Head drive circuit excessive voltage error

Circuit error (include blowout of a fuse)

Transistor temperature error

X-Hot detect error (pre printing)

X-Hot detect error (after flushing)

Head temperature error

Printing inspection less mode error

CR PID excess load error

CR PID excess speed error

CR PID reverse error

CR PID lock error

CR PID speed fall error

failure)

• Motor driver failure

This error occurs if the printer becomes a fatal error status due to a failure of parts other than the printer such as the scanner or ADF.

• PE Sensor failure

• Main Board failure

• Head FFC failure

• Main Board failure

• Printhead failure

• Main Board failure

This error occurs if the printing or manual cleaning are performed in Printing inspection less mode.

• CR Encoder failure (contaminated/detached scale, Encoder Board failure)

• CR Motor failure

• Carriage overload error (paper jam/foreign object)

• Cable disconnection

• CR Encoder failure (contaminated/detached scale, Encoder Board failure)

• Motor driver failure (Main Board failure)

• Slipping teeth of the CR Timing Belt

• Improper tension of the CR Timing Belt

• CR Encoder failure (contaminated/detached scale, Encoder Board failure)

• Slipping teeth of the CR Timing Belt

• Improper tension of the CR Timing Belt

• Carriage overload error (paper jam/foreign object)

• CR Encoder failure (contaminated/detached scale, Encoder Board failure)

• CR Motor failure

• Carriage overload error (paper jam/foreign object)

• Cable disconnection

• CR Encoder failure (contaminated/detached scale, Encoder Board failure)

• Motor driver failure (Main Board failure)

• Slipping teeth of the CR Timing Belt

• Improper tension of the CR Timing Belt

• Carriage overload error (paper jam/foreign object)

---*

Troubleshooting 16

Confidential

Epson ET-4550, L655/656 Revision B

Table 1-2. Fatal Error List

Error type

Printer

System Error

Error

code

0xE8 (000232)

0xE9 (000233)

0xEA (000234)

0xEE (000238)

0xEF (000239)

0xF1 (000241)

0xF2 (000242)

0xF3 (000243)

0xF4 (000244)

0xF8 (000248)

0xF9 (000249)

0xFA (000250)

0xFE (000254)

0xFF (000255)

202620 WiFi error 205102 Card board error

CR load position reverse error

CR load position excess speed error

CR load position excess load error

CR PID driving time error

CR load position excess driving time error

PF PID excess load error

PF PID excess speed error

PF PID reverse error

PF PID lock error

PF load position reverse error

PF load position excess load error

PF PID driving time error

PF load position excess driving time error

Error name Possible cause

• CR Encoder failure (contaminated/detached scale, Encoder Board failure)

• Slipping teeth of the CR Timing Belt

• Improper tension of the CR Timing Belt

• Carriage overload error (paper jam/foreign object)

• CR Encoder failure (contaminated/detached scale, Encoder Board failure)

• Motor driver failure (Main Board failure)

• Slipping teeth of the CR Timing Belt

• Improper tension of the CR Timing Belt

• CR Encoder failure (contaminated/detached scale, Encoder Board failure)

• CR Motor failure

• Carriage overload error (paper jam/foreign object)

• Cable disconnection

• Main Board failure

• PF Encoder failure (contaminated/detached scale, Encoder Board failure)

• PF Motor failure

• PF drive mechanism overload (paper jam/foreign object)

• Cable disconnection

• PF Encoder failure (contaminated/detached scale, Encoder Board failure)

• Motor driver failure (Main Board failure)

• Slipping gears have occurred around the PF Motor gears.

• PF Encoder failure (contaminated/detached scale, Encoder Board failure)

• Slipping gears have occurred around the PF Motor gears.

•Paper jam

• PF Encoder failure (contaminated/detached scale, Encoder Board failure)

• PF Motor failure

• PF drive mechanism overload (paper jam/foreign object)

• Cable disconnection

• PF Encoder failure (contaminated/detached scale, Encoder Board failure)

• Slipping gears have occurred around the PF Motor gears.

• PF Encoder failure (contaminated/detached scale, Encoder Board failure)

• Motor driver failure (Main Board failure)

• Slipping gears have occurred around the PF Motor gears.

• PF Encoder failure (contaminated/detached scale, Encoder Board failure)

• PF Motor failure

• PF drive mechanism overload (paper jam/foreign object)

• Cable disconnection

• Main Board failure

WiFi board failure Card board failure

Troubleshooting 17

Confidential

Epson ET-4550, L655/656 Revision B

Note "*": Not occurs except in manufacturing process

Troubleshooting 18

Confidential

CHAPTER 2

DISASSEMBLY/REASSEMBLY

Confidential

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 Overview 20

Confidential

Epson ET-4550, L655/656 Revision B

4 3

Front 7

Right

Left

1112

Rear

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

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)

Disassembly/Reassembly Overview 21

7 ADF Pad Assy (p40)

Note "*": The FAX Filter Assy is mounted only on models for some country/region.

Figure 2-1. Exterior Parts

Confidential

Epson ET-4550, L655/656 Revision B

1 2 3

 Printer mechanism

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

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 Overview 22

Confidential

Epson ET-4550, L655/656 Revision B

1 2 3

578

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

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

Disassembly/Reassembly Overview 23

Confidential

Epson ET-4550, L655/656 Revision B

7 5

2 3

Front Rear

 Ink Tank Unit

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)

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

Confidential

+ 55 hidden pages