Epson L120 Service Manual

SERVICE MANUAL

Color Inkjet Printer

L120

CONFIDENTIAL

SEIJ13-005

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 2014 SEIKO EPSON CORPORATION

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, 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.

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 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.

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 "2.2 Disassembly/Reassembly Procedures (p28)".

Confidential

Revision Status

Revision	Date of Issue	Description
A	January 24, 2014	First Release

Confidential

L120	Revision A

Contents

Chapter 1 Troubleshooting

1.1	Troubleshooting.........................................................................................................................................................		9
	1.1.1	Troubleshooting Workflow ..............................................................................................................................	9
1.2	Power-On Sequence ................................................................................................................................................		11
1.3	Fatal Error Code List...............................................................................................................................................		13
	1.3.1	Printer Fatal Error Code .................................................................................................................................	13

Chapter 2 Disassembly/Reassembly

2.1	Overview		.................................................................................................................... .............................................	16
	2.1.1	Tools ...............................................................................................................................................................		16
	2.1.2	Jigs ..................................................................................................................................................................		16
	2.1.2.1 ..................................................................................................................Making the Spring Hook Jig			16
	2.1.3	Locations ...........................................................................................................................of the Parts/Units		17
	2.1.4	Standard ......................................................................................Operation Time for Servicing the Product		21
	2.1.5	Checks ..............................................................................................and Precautions before Disassembling		23
	2.1.5.1 ..................................................................................................		Factors which Affect the Print Quality	23
	2.1.5.2 ............		Factors which Affect the Safety of Service Personnel such as Ink Leakage during Operation	24
2.2	Disassembly/Reassembly .....................................................................................................................Procedures			28
	2.2.1	Disassembly ...................................................................................................................................Flowchart		29
	2.2.2	Disassembly ...........................................................................................Flowchart (Printhead/Main Board)		33
2.3	Detailed Disassembly/Reassembly ...........................................................................Procedure for each Part/Unit			34
2.4	Routing FFCs/cables ...............................................................................................................................................			40

Chapter 3 Adjustment

3.1	Required Adjustments .............................................................................................................................................	43
3.2	Adjustment Program................................................................................................................................................	47
	3.2.1 Operating Environment ..................................................................................................................................	47
	3.2.2 Details of the Adjustment Program ................................................................................................................	47
	3.2.2.1 CR Motor Heat Protection Control / PF Motor Heat Protection Control ..............................................	47
3.3	Mechanism Adjustment / Check .............................................................................................................................	48
	3.3.1 Checking the Platen Gap ................................................................................................................................	48
	3.3.2 CR/PF Belt Tension Check.............................................................................................................................	50

Chapter 4 Maintenance

4.1	Overview .................................................................................................................................................................		53
	4.1.1	Cleaning..........................................................................................................................................................	53
	4.1.2	Lubrication......................................................................................................................................................	53
4.2	Lubrication Points and Instructions.........................................................................................................................		54

Chapter 5 Appendix

5.1	Connector Diagram .................................................................................................................................................		57
5.2	Points to be checked before packing the printer......................................................................................................		57
5.3	Protection for Transportation ..................................................................................................................................		58
	5.3.1	Securing the CR Unit......................................................................................................................................	58
	5.3.2	Securing the Printer Cover .............................................................................................................................	59

7

Confidential

CHAPTER 1

TROUBLESHOOTING

Confidential

L120	Revision A

1.1 Troubleshooting

This section describes the troubleshooting workflow and fatal error information.

1.1.1 Troubleshooting Workflow

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

Troubleshooting

Troubleshooting

9

Confidential

L120

Revision A

Start

1

Major problem without

Major problem with error message

Turn on the power*1

error message

No Power*2

No

Fatal error

Incomplete Initial Ink Charge

Maintenance error

Ink End error

Paper Jam Fatal error

[Presumable Cause]

Does printer turn on the

Please refer to " 1.3 Fatal Error Code

[Occurrence Condition]

[Occurrence Condition]

[Occurrence Condition]

[Occurrence Condition]

•

PS Unit damage

power?

•

Main Board damage

List (p13)".

Ink LED is ON and STM

This error occurs when

This error occurs when ink

This error occurs when CR Unit is

indicates "Initial ink charging is

maintenance counter in EEPROM

counter reaches ink end level.

blocked by jammed paper.

Yes

[Major Troubleshooting]

not complete".

exceeds the specified value.

[Major Occurrence Timing]

[Major Occurrence Timing]

•

PS Unit replacement

[Major Occurrence Timing]

[Major Occurrence Timing]

•

Main Board replacement

•

Power-on timing

•

Power-on timing

Print start timing.

•

Power-on timing

•

Print start timing

[Major Troubleshooting]

Is Power-on sequence

No

1

[Main board replacement]

[Troubleshooting]

•

Print start timing

•

Cleaning timing

• EEPROM data copy for old

•

Cleaning timing

[Troubleshooting]

•

Remove jammed paper

finished without error?

main board

Perform initial ink charge

[Troubleshooting]

[NOTE]

• EEPROM data initial setting

• Refill ink and reset ink counter

Yes

for new Main board

• Porous Pad replacement &

by panel.

On this product, if CR Unit

Maintenance counter reset

touches jammed paper, CR Unit

moves back in the opposite

direction so that customer can

Standby condition

Main board replacement

remove the paper. However, if CR

Unit cannot move in this

• EEPROM data copy for old

sequence, this error occurs.

Main Board Assy

Print check pattern

• EEPROM data initial setting

for new Main Board Assy

No

Does an error occur

when

printing?

Yes

Paper Jam error

No Paper error

Double Feed error

Paper Size Unmatch error

[Occurrence Condition]

[Occurrence Condition]

[Occurrence Condition]

[Occurrence Condition]

This error occurs when top/

This error occurs when top of

When manual duplex printing is

This error occurs if the actual

Is printing operation

No

bottom of paper is not detected by

paper can not be detected

selected using the printer driver,

paper length detected by PE

PE Sensor in the specified steps of

correctly by PE Sensor in the

this error occurs if the actual

Sensor does not match with the

finished without trouble?

paper loading / ejecting operation

specified steps up to completion

paper length detected by PE

paper length specified in the

correctly.

of the paper loading operation.

Sensor does not match with the

printer driver. (The error occurs

Yes

[Major Occurrence Timing]

(No paper / No loading / large

paper length specified in the

no matter when the actual length

paper skew)

printer driver. (The error occurs

is longer or shorter than the

•

Power-on timing

[Major Occurrence Timing]

when the actual length is longer

theoretical length specified in the

•

Paper loading timing

than the theoretical length

driver.)

Major problem without error message

•

Paper eject timing

•

Paper loading timing

specified in the driver.)

[Major Occurrence Timing]

[Major Troubleshooting]

[Major Troubleshooting]

[Major Occurrence Timing]

•

Paper eject timing

Finish*3

Poor Printing

Poor Paper Loading

1 Perform paper eject operation

1 Set paper in ASF and perform

•

Paper loading timing

[Troubleshooting]

•

from operation panel.

paper feed operation.

•

Paper eject timing

[Phenomenon]

[Presumable Cause]

Success

2 If the paper stops before

[Troubleshooting]

• PE Sensor Lever replacement

•

Poor printing quality

• Use of 3rd party media

Starts paper feeding

reaching PE Sensor, remove it

•

PE Sensor replacement

• Ink stain on paper

•

Edge guide mis-setting

operation again if printer has

and check the paper condition.

• PE Sensor Lever replacement

•

(Main Board replacement)

•

Dot missing

•

Foreign material

print data.

3 A) If paper is OK, set paper in

•

PE Sensor replacement

Main Board replacement

• Paper eject without printing

•

Part come-off

•

Fail

ASF and move edge guides to

•

(Main Board replacement)

[Presumable Cause]

• Contamination of LD Roller or

Occurs paper jam error

appropriate position, and

Main Board replacement

PF roller

again.

perform 2 again.

[NOTE]

• Driver / Panel mis-setting

[Major Troubleshooting]

2 If fail in the above 1, remove

B) If damage in the above 2,

• Contamination of CR scale

the paper by opening Printer

check foreign materials /

This error may occur in the

•

Contamination of Printhead

•

Recommendation of EPSON

Cover.

parts come-off / parts

manual duplex printing if the

cover

media

3 Perform paper eject operation

transformation in paper

inverted sheet printed on the first

•

Printhead damage

•

Edge guide re-setting

•

from operation panel again.

path.

side sticks to the second sheet

• Ink clogging of Printhead

•

Foreign material removal

Success

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

when the first side printing is

• Contamination on Cap Unit /

•

Part re-installation

Starts paper feeding

check foreign material / Part

complete and the sheet is inverted

Wiper of Ink System Assy

•

Roller replacement

operation again if printer has

come-off / surface condition of

and set to ASF to print on the

• Ink System Assy damage

print data.

LD Roller or PF Roller / PE

other side.

• Float of Porous Pad on Paper

•

Fail

Sensor Lever / PE Sensor /

Guide Front

Abnormal Noise

Occurs paper jam error

Main Board / PF Motor.

•

Narrower/Wider PG

again.

(out of standard)

[Presumable Cause]

4 If fail in the above 3, check

• PE Sensor Lever damage

•

Foreign material

foreign material / part come-

•

PE Sensor damage

•

Insufficient grease

off / PE Sensor Lever / PE

[Major Troubleshooting]

•

Gear damage

Sensor / Main board.

• Driver / Panel re-setting

[Major Troubleshooting]

•

CR Scale replacement

•

Foreign material removal

•

Printhead cover cleaning

•

Lubrication of grease

•

Printhead cleaning

•

Gear replacement

•

Ink Cartridge replacement

*1: If the Hopper of ASF on the returned product touches the LD Roller, the initial ink charge has

•

Printhead replacement

• Rubber cleaning of Cap Unit

Blank printing

not been completed for the product yet.

• Ink System Assy replacement

*2: If the printer can turn on but turns off right away, the protection circuit may cut off the power

• Porous Pad re-installation

[Phenomenon]

due to an error such as a circuit failure.

•

Printer replacement

Blank printing

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

• PE Sensor Lever replacement

•

PE Sensor replacement

[Presumable Cause]

(Main Board replacement)

•

Ink tube crumples

 If the reason for the return is evident, first check the phenomenon user

•

Ink tank replacement

• Ink tube connection is

claims recurs, then proceed to the troubleshooting.

•

incomplete.

Ink tank replacement

 This flowchart is compiled based on the following contents.

[Major Troubleshooting]

• Ink tube re-installation

• Our experience regarding the quality problem.

• ESK’s repair data.

• Printer Mechanism specification for the product.

Troubleshooting

Troubleshooting Workflow

10

Confidential

L120	Revision A

1.2 Power-On Sequence

This section describes the power-on sequences in two conditions. The preconditions are as follows.

Condition 1: Normal power-on sequence (See Table 1-1.)

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

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

No paper on the paper path.

The Printhead is capped with the Cap Assy.

The CR Unit is normally fixed by the Change Lever.

Maintenance error recovery has never been performed.

Table 1-1. Condition 1: Normal Power-on Sequence

CR Unit/PF Roller Operation*1 movement and

position*2

1. Printhead initialization and fuse inspection

1-1.Initializes the Printhead, and checks for the fuse on the circuit boards in the printer.*3

2.Checking for waste ink overflow

2-1.Checks the waste ink counter if the waste ink overflow is occurring.

3.Seeking the home position

3-1.The CR Unit moves to the 80-digit side slowly and confirms it touches the Change Lever (CR lock).

3-2.The CR Unit moves to the 0-digit side slowly.

3-3.After the PE Sensor checks if paper exists, the PF Motor rotates clockwise for one second and releases the CR lock.

3-4.While checking if the CR Unit does not touch the Change Lever (CR lock) or the foreign material, the CR Unit moves to the 80-digit side slowly until it touches the Left Frame.

3-5.The distance from the position where the CR Unit touched to the Left Frame is regarded as the standard distance from the origin position, and the home position is fixed.

From then on, the CR Unit position is monitored according to the signals from the CR Encoder. 3-6.The CR Unit moves to near its home position quickly.

4. PF Motor Measurement

4-1.The PF Motor rotates clockwise until the PF Roller turns five times to perform a load measurement.

5. Detecting ink cartridge and initializing ink system*4

5-1.The CR Unit returns to its home position.

6. Low temperature operation sequence*5

6-1.The CR Unit quickly moves back and forth between near the Change Lever and near the Left Frame for two times.

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: The fatal error occurs if there is a problem such as the fuse blew. *4: The empty suction operation may occur depending on the situation.

*5: Executed when the detected temperature is under 5 oC (41oF) by the thermistor on the Printhead.

Troubleshooting

Power-On Sequence

11

Confidential

L120	Revision A

Condition 2: Power-on sequence after recovering from a paper jam error (See Table 1-2.)

Turning on the printer after turning it off with a paper jam fatal error.

There still remains paper on the paper path out of the detecting area of the PE Sensor.

Maintenance error recovery has never been performed.

Table 1-2. Condition 2: Power-on Sequence after Recovering from a Paper Jam Error

CR Unit/PF Roller Operation movement and

position

Executes No.1 to No.3 on the normal power-on sequence (Table 1-1).

4. Detecting remaining paper

4-1.5.The CR Unit returns to its home position.

4-2.The CR Unit moves to the 80-digit side and confirms there is no paper.*1

4-3.The CR Unit quickly returns to its home position, and displays on the LCD that the paper jam error has occurred.

When the user removes the paper and releases the paper jam error by panel operation, the normal power-on sequence from No.1 (Table 1-1) is executed again.*2

Note *1: “Paper exists” is detected when the CR Unit touches the paper. When “paper does not exist” is detected, the power-on sequence of condition 1 (Table 1-1) is executed from No.4.

*2: If the paper jam error cannot be solved after repeating the power-on sequence on condition 2 (Table 1-2) twice, the printer turns into the paper jam fatal error for the third time.

To recover from the maintenance error, the dedicated software that can be downloaded from the web site which can be accessed from STM3 is required.

The printer operation related to the maintenance error recovery is as follows.

•When the waste ink counter reaches the threshold value (1) for the first time and the maintenance error occurs, the counter threshold of the maintenance error is changed to threshold value 2 after performing recovery from the maintenance error.

•After the threshold value (2) is enabled, the warning; to notify the possibility of ink leakage out of the printer, is displayed every time the waste ink counter increases by 1%.

•If the waste ink counter reaches the threshold value (2), the maintenance error occurs. Then, the waste ink counter is changed back to the threshold value (1) after recovering from the maintenance error, and the warning is displayed repeatedly according to the increment of the waste ink counter until the maintenance error occurs when the threshold value (2) is reached.

(Recovery from the maintenance error can be performed up to the specified number of times.)

Troubleshooting

Power-On Sequence

12

Confidential

L120	Revision A

1.3 Fatal Error Code List

This section describes how to check the fatal error code, description, and the possible causes.

1.3.1 Printer Fatal Error Code

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

Table 1-3. Fatal Error List (Printer)

	Error type	Error	Error name	Possible cause
		code

DC motor error

			•	CR Motor failure
			• CR Unit drive mechanism overload (paper jam, foreign object,
				insufficient grease, deformation of the Main Frame)
	01H	CR PID excess load error	• Some part may be detached. (Paper Guide Upper Assy, Cap Assy)
			• Tooth skip of the CR Timing Belt
			• Improper tension of the CR Timing Belt
			•	Cable disconnection
			• Main Board failure (Motor driver failure)
			• CR Encoder failure (contaminated/detached scale, Encoder Sensor
	02H	CR PID excess speed error		failure)
			• Main Board failure (Motor driver failure)
			• CR Encoder failure (contaminated/detached scale, Encoder Sensor
				failure)
			• Some external force is applied to the printer such as stopping the CR Unit
	03H	CR PID reverse error		during printer operation, vibration or the like.
			• Tooth skip of the CR Timing Belt
			•	Paper jam
			• Main Board failure (Motor driver failure)
			• CR Encoder failure (contaminated/detached scale, Encoder Sensor
				failure)
			•	CR Motor failure
	04H	CR PID lock error	• CR Unit drive mechanism overload (paper jam, foreign object,
				insufficient grease, deformation of the Main Frame)
			• Some part may be detached. (Paper Guide Upper Assy, Cap Assy)
			•	Cable disconnection
			• Main Board failure (Motor driver failure)
			• CR Encoder failure (contaminated/detached scale, Encoder Sensor
	08H	CR load position reverse error		failure)
			• Main Board failure (Motor driver failure)
			• CR Encoder failure (contaminated/detached scale, Encoder Sensor
				failure)
	09H	CR load position excess speed error	• Tooth skip of the CR Timing Belt
			• Improper tension of the CR Timing Belt
			•	Paper jam
			• Main Board failure (Motor driver failure)
			•	CR Motor failure
			• CR Unit drive mechanism overload (paper jam, foreign object, Change
	0AH	CR load position excess load error		Lever failure)
			•	Cable disconnection
			• Main Board failure (Motor driver failure)
			•	PF Motor failure
			• PF drive mechanism overload (paper jam, foreign object, insufficient
				grease, deformation of the Main Frame)
	F1H	PF PID excess load error	•	Tooth skip of the PF Timing Belt
			• Improper tension of the PF Timing Belt
			•	Cable disconnection
			• Main Board failure (Motor driver failure)
			• PF Encoder failure (contaminated/detached scale, Encoder Sensor failure)
	F2H	PF PID excess speed error	• Tooth skip of the PF Timing Belt
			• Improper tension of the PF Timing Belt
			• Main Board failure (Motor driver failure)

Troubleshooting

Fatal Error Code List

13

Confidential

L120					Revision A
			Table 1-3. Fatal Error List (Printer)
	Error type	Error	Error name		Possible cause
		code
				• PF Encoder failure (contaminated/detached scale, Encoder Sensor failure)
				• Tooth skip of the PF Timing Belt
		F3H	PF PID reverse error	• Improper tension of the PF Timing Belt
				•	Paper jam
				• Paper is pulled out from the ASF side when paper is fed
				• Main Board failure (Motor driver failure)
				• PF Encoder failure (contaminated/detached scale, Encoder Sensor failure)
				•	PF Motor failure
		F4H	PF PID lock error	• PF drive mechanism overload (paper jam, foreign object, insufficient
					grease, deformation of the Main Frame)
				•	Cable disconnection
	DC motor			• Main Board failure (Motor driver failure)
				•	PF Encoder failure (contaminated/detached scale, Encoder Sensor failure)
	error
		F8H	PF load position reverse error	•	Tooth skip of the PF Timing Belt
				• Improper tension of the PF Timing Belt
				• PF Encoder failure (contaminated/detached scale, Encoder Sensor failure)
		F9H	PF load position excess speed error	• Tooth skip of the PF Timing Belt
				• Improper tension of the PF Timing Belt
				• Main Board failure (Motor driver failure)
				•	PF Motor failure
				• PF drive mechanism overload (paper jam, foreign object)
		FAH	PF load position excess load error	•	Tooth skip of the PF Timing Belt
				• Improper tension of the PF Timing Belt
				•	Cable disconnection
		D1H	CR (PID) driving time error	•	Main Board failure (Firmware failure)
				•	Change Lever failure
		D2H	CR (load position) driving time error	•	CR Motor failure
	Motor drive			• Main Board failure (Motor driver failure)
	time error	D3H	PF (PID) driving time error	•	Main Board failure (Firmware failure)
				•	Change Lever failure
		D4H	PF (BS) driving time error	•	CR Motor failure
				• Main Board failure (Motor driver failure)
		40H	Transistor temperature error	•	Main Board failure
	Printhead	41H	X-Hot detect error (pre printing)	•	Printhead failure
	system error	42H	X-Hot detect error (after flushing)
				•	Main Board failure
		43H	Head temperature error
				•	Foreign object
		50H	Home position error	• Deformation of the Main Frame
				•	Change Lever failure
				•	Paper jam
	Sequence		Contact error at ink replacement timing	•	Foreign object
		56H		•	Ink Cartridges are not installed correctly
	error		(Power-off)
				•	Paper jam
				•	Foreign object
		5BH	Insoluble paper jam error	• Deformation of the Main Frame
				•	Change Lever failure
				•	Paper jam
	Circuit error	80H	Circuit error (include blowout of a fuse)	•	Main Board failure

Troubleshooting

Fatal Error Code List

14

Confidential

CHAPTER 2

DISASSEMBLY/REASSEMBLY

Confidential

L120	Revision A

2.1 Overview

This chapter describes procedures for disassembling the main parts/units of this product. Unless otherwise specified, disassembled parts/units can be reassembled by reversing the disassembly procedure. See the cautions or tips for disassembly/reassembly described in "2.3 Detailed Disassembly/Reassembly Procedure for each Part/ Unit (p34)".

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	---
Acetate tape	---	1003963

Note 1: Some of the tools listed above are commercially available.

2:EPSON provides the tools listed with EPSON part code.

2.1.2Jigs

Name	Quantity	EPSON Part Code
Spring hook jig*	1	Can be made with a commercial item See " Making the Spring Hook Jig (p16)".
Thickness gauge (1.5 mm)	2	Commercially available
Thickness gauge (2.0 mm)	2	Commercially available
Sonic tension meter	1	1294120

Note *: If performing the disassembling/reassembling procedure is difficult using tweezers such as when reassembling " Cap Lever/Cap Assy (p35)", the spring hook jig helps you to remove/attach the spring easier.

2.1.2.1 Making the Spring Hook Jig

Fold a clip (commercial item) as shown in Fig. 2-1.

Before folding

Fold here

After folding

40 mm or more

Clip

Clip

Fold appropriate length to hitch a spring.

Figure 2-1. Making the Spring Hook Jig

Disassembly/Reassembly

Overview

16

Confidential

L120	Revision A

2.1.3 Locations of the Parts/Units

This section shows the locations of the main parts/units of this product.

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

 Exterior parts
Front	1	Right

3

4

	2
Left		Rear
	5	6	7

			8
No.	Name	No.	Name
1	Housing Upper (p31)	5	Buttons (p31)
2	Printer Cover (p29)	6	Paper Support Assy (p29)
3	Cap Tank (p29)	7	Paper Support Joint (p29)
4	Ink Supply Tank Upper Housing (p29)	8	Frame Base Assy (p30)

Figure 2-2. Exterior Parts

Disassembly/Reassembly

Overview

17

Confidential

L120	Revision A

 Printer mechanism

		2	3	4	5
					6
	1
					7
	8	9	10	11
No.	Name			No.	Name
1	CR Driven Pulley Assy (p30)			6	Adapter (p31)
2	CR Scale (p30)			7	CR Unit (p32)
3	CR Timing Belt (p32)			8	PF Roller Unit (p32)
4	Printhead (p31)			9	Star Wheel Holder Assy (p31)
5	CR Encoder Sensor (p32)			10	Paper Guide Upper Assy (p32)
				11	Joint (p31)

Figure 2-3. Printer Mechanism: Front

1

2

3

4

5

				6
		9
		8
		7
No.	Name		No.	Name
1	LD Roller Assy (p30)	6		Pump Unit (p32)
2	LD Roller Cover (p30)	7		Cap Assy (p29)
3	Hopper (p30)	8		Porous Pad for Cap Assy (p29)
4	Retard Roller Assy (p29)	9		Cap Lever (p29)

5 Paper Back Lever (p29)

Figure 2-4. Printer Mechanism: Right

Disassembly/Reassembly

Overview

18

Confidential