Epson ET-4550, ET-3600, L655, L656, L605 Service Manual

...

SERVICE MANUAL

Color Inkje t 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 produc t 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.

2015 SEIKO EPSON CORPORATION

P・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 de scr i bed in this manual, do not co nnec t 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 swi tch is of f. If you need to perform the wor k with the power cable connect ed t o 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 disas sembly and reassembl y to prote ct your eye s from ink in wor king. 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 per formed on this pr oduct by person s unfamil iar with basic s afety kn owledge re quired f or electrician.

3. The power rating of this produc t is indicated on the seri al number/rating plate. Neve r 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-app rov ed compo nent s may damage the product and void a ny 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 genera tes cou nter e lectr omot ive for ce suc h as when ro ta ting t he PF Roll er or when movin g 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 inser t io n.

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7. In order to protect sensiti ve microp roc essor s and circu itry , use stati c disch arge equi pment, such as ant i-st atic wrist straps, when accessing internal components.

8. Do not tilt this produc t immediate ly after ini tial in k charge, es peciall y after perf orming the i nk charge s everal times. Doing so may caus e ink to leak f rom the product becaus e it may t ake so me ti me for t he was te 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 c ont act 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 as sembl in g thi s product, make sure to wear gloves to avoid injuri es fr om metal par t s 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 otherwis e specif ied in t his manual, the l abels at tached on the r eturned p roduct sh ould be t ransferr ed 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 foll owing cha pte rs, is inte nded for re pair s ervi ce pers onnel a nd incl ude s info rmatio n 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 Transport at io n

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 operat ing or main tenanc e proced ure , pract ice, or c onditi on that , if not st rict ly obse rved, 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

C May 9, 2016

D June 15, 2016

E J une 15, 2017

F July 17, 2018

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 Disassem bly 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)



Chapter2



" Printer Mechanism (p49)"



Notice



Made change in P・CS Quality Assurance Department(p2)

Chapter2



"2.3 Disassembly/Reassembly Procedures (p37)"



"2-4 Disassembly Flowchart (4) (p42)"

By changing the configuration of ASP, Added element parts of Ink System

Chapter2



"2.4 Detailed Disassembly/Reassembly Procedure for each Part/Unit (p45)"



" Ink System (p51)"

By changing the configuration of ASP, Added explanation about Ink System

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Epson ET-4550, L655/656 Revision F

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 Detail ed 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

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Epson ET-4550, L655/656 Revision F

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

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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 Foun d”, check fatal error code.

(p 11)

ADF/Scanner

unit failure

Printer failure only

Yes

Does printer tu r n o n th e

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 F

Figure 1-1. T roubleshooting Workfl ow (1)

Troubleshooting Troubleshooting Workflow 10

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Epson ET-4550, L655/656 Revision F

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 protect ion circuit may cut off the power due to an error such as a circ uit failure.

Please refer to " 1.3 Fatal Error

Code List (p14)"for

troubleshooting.

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 st a rt 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 timin g

[Major Troubleshooting]

• Refill ink and reset ink counter by panel.

Paper Jam error

Please r efer to " Paper Jam error".

CR Fixing Tape error

[Occurrence Condition]

This error occurs if a pa pe r ja m 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.

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

Error is indicated during printing nozzle check patt ern (p 10)

Paper Jam error

[Occur rence Cond i t ion]

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]

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 d u ring 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, set

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

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

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 read justment

• 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-installation

• 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 replac e ment

ADF does not operate normally

(p 10)

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. T r ouble shoo ting Workflow (2)

Troubleshooting Troubleshooting Workflow 11

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Epson ET-4550, L655/656 Revision F

080

CRLock

CRUnit

080 HP

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. Printhead initiali za tio n

1-1.Initializes the Printhead.

2. Maintenance error detection

2-1.Checks the tube maintenance counter for ink tube errors. 2-2.Checks the waste ink counter if the waste ink overflow i s occ urring.

3. Releasing the CR lock

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

CR Unit/PF Roller

movement and position

080 HP

4. Seeking the home position

4-1.The CR Unit moves to the 0-digit side slowly and confirms it touch es th e Ri ght 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. The re aft er, the position of the CR Unit is monitor ed ba sed on the information provided by the CR Encod er Se nsor.

4-3.The CR Unit slowly moves to its home position.

4-4.The PF Roller rotate s clo ckwise for approximately 1 seco nd.

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

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Epson ET-4550, L655/656 Revision F

080 HP 080 HP

080 HP

Table 1-1. Normal Power-on Sequence

Operation

6. Adjust me nt of CR acc eleration delay

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.

CR Unit/PF Roller

movement and position

7. CR measurement

7-1.The CR Unit move s un ti l i t to uches the Right Frame.

7-2.The CR Unit slowly m oves to its home position, and then moves unt il it touches the Right Frame again.

7-3.The CR Motor ca rries out the measuremen t dri ve, 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 slow l y unt il it touc he s the Rig ht Frame, and then moves back to its home po sit ion .

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

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Epson ET-4550, L655/656 Revision F

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 Encode r 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 exces s 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 detect ion distance exceeded

Opposite side contact detection distance exceeded error

Wrong contact detection distance error

Measurement e rror

LED light fa ilure

Option error • Main Board failure

failure)

• Motor driv er failure (Main Board failure )

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

• Paper jam

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

• Scanner Motor failure

• Paper jam

• Cable disconnec tion

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

• Motor driv er failure (Main Board failure )

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

• Paper jam

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

• Scanner Motor failure

• Paper jam

• Cable disconnec tion

•CIS Unit failure

• Scanner Housing failure

• Main Board failure

• Insuffi cient grease

• Foreign object

• FFC for CIS failure / FFC for CIS connectio n failu re

•CIS Unit failure

• Scanner Housing failure (Including w rong attachment of the origi n mark)

• Main Board failure

• FFC for CIS failure / FFC for CIS connectio n failu re

• Motor failure

• Scanner drive mechanism was overloaded.

• Insuffi cient grease

• Foreign object

• Lack of gears

• Deformation of the shaft

•CIS Unit failure

• Main Board failure

Troubleshooting 14

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Epson ET-4550, L655/656 Revision F

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 Encode r 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 spe ed 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/ ej ec ting papers out of the standard range or curled papers

• Using long pape rs (Legal or longer)

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

• Motor driv er failure (Main Board failure )

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

• Paper jam error

failure)

• Scanner Motor failure

• ADF drive me c h anism overload (assembling fai lur e, foreign object, lubrication fail ur e)

• Cable disconnec tion

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

• Motor driv er failure (Main Board failure )

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

• Paper jam error

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

• Scanner Motor failure

• ADF drive me c h anism overload (assembling fai lur e, foreign object, lubrication fail ur e)

• Cable disconnec tion

---*

• 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 Boa rd failure)

• Cable disconnec tion

• Ink system failure

• Main Board failure

Troubleshooting 15

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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 erro r

Factor error other than print er de vi ce

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 be comes a fatal error status due to a failure of parts other than t he printer such as the scanner or ADF.

• PE Sensor fail ure

• Main Board failure

• Head FFC failure

• Main Board failure

• Printhead fa il ure

• Main Board failure

This error occurs if the printing or ma nua l c le an ing are performed in Printing inspection less mode.

• CR Encoder failure (contaminated/detached scale, Encoder Boa rd failure)

• CR Motor failure

• Carriage overload error (paper jam/foreign object)

• Cable disconnec tion

• CR Encoder failure (contaminated/detached scale, Encoder Boa rd failure)

• Motor driv er failure (Main Board failure )

• Slippin g te eth of the CR Timing Belt

• Improper te nsion of the CR Timing Belt

• CR Encoder failure (contaminated/detached scale, Encoder Boa rd failure)

• Slippin g te eth of the CR Timing Belt

• Improper te nsion of the CR Timing Belt

• Carriage overload error (paper jam/foreign object)

• CR Encoder failure (contaminated/detached scale, Encoder Boa rd failure)

• CR Motor failure

• Carriage overload error (paper jam/foreign object)

• Cable disconnec tion

• CR Encoder failure (contaminated/detached scale, Encoder Boa rd failure)

• Motor driv er failure (Main Board failure )

• Slippin g te eth of the CR Timing Belt

• Improper te nsion of the CR Timing Belt

• Carriage overload error (paper jam/foreign object)

---*

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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 erro r

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 ex ces s dri vin g time err or

Error name Possible cause

• CR Encoder failure (contaminated/detached scale, Encoder Boa rd failure)

• Slippin g te eth of the CR Timing Belt

• Improper te nsion of the CR Timing Belt

• Carriage overload error (paper jam/foreign object)

• CR Encoder failure (contaminated/detached scale, Encoder Boa rd failure)

• Motor driv er failure (Main Board failure )

• Slippin g te eth of the CR Timing Belt

• Improper te nsion of the CR Timing Belt

• CR Encoder failure (contaminated/detached scale, Encoder Boa rd failure)

• CR Motor failure

• Carriage overload error (paper jam/foreign object)

• Cable disconnec tion

• Main Board failure

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

• PF Motor failure

• PF drive mechanism overload (pa pe r ja m/f oreign object)

• Cable disconnec tion

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

• Motor driv er 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 (pa pe r ja m/f oreign object)

• Cable disconnec tion

• 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 driv er 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 (pa pe r ja m/f oreign object)

• Cable disconnec tion

• Main Board failure

WiFi board failure Card board failure

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Note "*": Not oc curs except in manufacturing process

Troubleshooting 18

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CHAPTER 2

DISASSEMBLY/REASSEMBLY

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Epson ET-4550, L655/656 Revision F

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 prov ide s the tools liste d 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 (thi ckness: 0.08 mm) 1 Commercially available Tube clip 4 Commercially available

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Epson ET-4550, L655/656 Revision F

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 (p 39) 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 6 ADF LD Cover Assy (p39) 13 7 ADF Pad Assy (p40)

Note "*": The FAX Filter Assy is mounted only on mod els for some coun t ry/region .

Disassembly/Reassembly Overview 21

Figure 2-1. Exterior Parts

Waste Ink Pad Assy (p39) Hinge (p39)

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1 2 3

 Printe r 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

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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 (p 41) 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

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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 Adap ter 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 L ower (p44) 8 Ink Supply Tank Tube Assy (p44)

Figure 2-7. Ink Tank Unit (2)

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