Page 1
SERVICE MANUAL
Color Inkjet Printer
L120
CONFIDENTIAL
SEIJ13-005
Page 2
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
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Safety Precautions
All safety procedures described here shall be strictly adhered to by all parties servicing and maintaining this
product.
DANGER
Strictly observe the following cautions. Failure to comply could result in serious bodily injury or loss of life.
1. Always disconnect the product from the power source and peripheral devices when servicing the product or
performing maintenance.
2. When performing works described in this manual, do not connect to a power source until instructed to do so.
Connecting to a power source causes high voltage in the power supply unit and some electronic components
even if the product power switch is off. If you need to perform the work with the power cable connected to a
power source, use extreme caution to avoid electrical shock.
WARNING
Strictly observe the following cautions. Failure to comply may lead to personal injury or loss of life.
1. Always wear protective goggles for disassembly and reassembly to protect your eyes from ink in working. If
any ink gets in your eyes, wash your eyes with clean water and consult a doctor immediately.
2. When using compressed air products; such as air duster, for cleaning during repair and maintenance, the use
of such products containing flammable gas is prohibited.
PRECAUTIONS
Strictly observe the following cautions. Failure to comply may lead to personal injury or damage of the product.
1. Repairs on Epson product should be performed only by an Epson certified repair technician.
2. No work should be performed on this product by persons unfamiliar with basic safety knowledge required for
electrician.
3. The power rating of this product is indicated on the serial number/rating plate. Never connect this product to
the power source whose voltages is different from the rated voltage.
4. Replace malfunctioning components only with those components provided or approved by Epson;
introduction of second-source ICs or other non-approved components may damage the product and void any
applicable Epson warranty.
5. The capacitors on the Main Board may be electrically charged right after the power turns off or after driving
motors which generates counter electromotive force such as when rotating the PF Roller or when moving the
CR Unit. There is a risk to damage the Main Board if the Head FFC is short-circuited with the capacitors on
the Main Board electrically charged, therefore, after the power turns off or after motors are driven, leave the
printer untouched for approximately 30 seconds to discharge the capacitors before starting disassembly/
reassembly.
6. To prevent the circuit boards from short-circuiting, be careful about the following when handling FFC or
cables.
When handling FFC, take care not to let the terminal section of FFC touch metal parts.
When connecting cables/FFC to the connectors on circuit boards, connect them straight to the connectors to avoid
slant insertion.
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7. In order to protect sensitive microprocessors and circuitry, use static discharge equipment, such as anti-static
wrist straps, when accessing internal components.
8. Do not tilt this product immediately after initial ink charge, especially after performing the ink charge several
times. Doing so may cause ink to leak from the product because it may take some time for the waste ink pads
to completely absorb ink wasted due to the ink charge.
9. Never touch the ink or wasted ink with bare hands. If ink comes into contact with your skin, wash it off with
soap and water immediately. If you have a skin irritation, consult a doctor immediately.
10. When disassembling or assembling this product, make sure to wear gloves to avoid injuries from metal parts
with sharp edges.
11. Use only recommended tools for disassembling, assembling or adjusting the printer.
12. Observe the specified torque when tightening screws.
13. Be extremely careful not to scratch or contaminate the following parts.
Nozzle plate of the Printhead
CR Scale
PF Scale
Coated surface of the PF Roller
Gears
Rollers
LCD
Scanner Sensor
Exterior parts
14. Never use oil or grease other than those specified in this manual. Use of different types of oil or grease may
damage the component or give bad influence on the printer function.
15. Apply the specified amount of grease described in this manual.
16. Make the specified adjustments when you disassemble the printer.
17. When cleaning this product, follow the procedure described in this manual.
18. When transporting this product after filling the ink in the printhead, pack the printer without removing the
ink cartridges in order to prevent the printhead from drying out.
19. Make sure to install antivirus software in the computers used for the service support activities.
20. Keep the virus pattern file of antivirus software up-to-date.
21. When disassembling/reassembling this product, if you find adhesive power of the double-sided tape which
secure the parts or FFC is not enough, replace the tape with new one and attach it correctly to the specified
points where the parts or FFC should be secured.
22. Unless otherwise specified in this manual, the labels attached on the returned product should be transferred to
the corresponding attachment positions on the new one referring to the labels on the returned product.
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About This Manual
This manual, consists of the following chapters, is intended for repair service personnel and includes information
necessary for properly performing maintenance and servicing the product.
CHAPTER 1. TROUBLESHOOTING
Describes the step-by-step procedures for the troubleshooting.
CHAPTER 2. DISASSEMBLY / REASSEMBLY
Describes the disassembly/reassembly procedures for main parts/units of the product, and provides the
standard operation time for servicing the product.
CHAPTER 3. ADJUSTMENT
Describes the required adjustments for servicing the product.
CHAPTER 4. MAINTENANCE
Describes maintenance items and procedures for servicing the product.
CHAPTER 5. APPENDIX
Provides the following additional information for reference:
Connector Diagram
Protection for Transportation
Symbols Used in this Manual
Various symbols are used throughout this manual either to provide additional information on a specific topic or
to warn of possible danger present during a procedure or an action. Pay attention to all symbols when they are
used, and always read explanation thoroughly and follow the instructions.
Indicates an operating or maintenance procedure, practice or condition that, if not strictly observed,
could result in serious injury or loss of life.
Indicates an operating or maintenance procedure, practice, or condition that, if not strictly observed,
could result in bodily injury, damage or malfunction of equipment.
May indicate an operating or maintenance procedure, practice or condition that is necessary to
accomplish a task efficiently. It may also provide additional information that is related to a specific
subject, or comment on the results achieved through a previous action.
For Chapter 2 “Disassembly/Reassembly”, symbols other than indicated above are used to show additional
information for disassembly/reassembly. For the details on those symbols, see "2.2 Disassembly/Reassembly
Procedures (p28)".
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Revision Status
Revision Date of Issue Description
A January 24, 2014 First Release
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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
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CHAPTER 1
TROUBLESHOOTING
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L120
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.
Revision A
Troubleshooting Troubleshooting 9
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L120 Revision A
Start
Turn on the power
*1
Does printer turn on the
power?
Yes
Is Power-on sequence
finished without error?
Yes
Standby condition
Print check pattern
Does an error occur
when printing?
Yes
Is printing operation
finished without trouble?
Yes
*3
Finish
No
No
No
No
1
Major problem without
error message
No Power
[Presumable Cause]
• PS Unit damage
• Main Board damage
[Major Troubleshooting]
• PS Unit replacement
• Main Board replacement
[Main board replacement]
1
• EEPROM data copy for old
main board
• EEPROM data initial setting
for new Main board
Main board replacement
• EEPROM data copy for old
Main Board Assy
• EEPROM data initial setting
for new Main Board Assy
*2
Please refer to
List (p13)"
[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
• Printhead damage
• Ink clogging of Printhead
• Contamination on Cap Unit /
• Ink System Assy damage
• Float of Porous Pad on Paper
• Narrower/Wider PG
• PE Sensor Lever damage
• PE Sensor damage
[Major Troubleshooting]
• Driver / Panel re-setting
• CR Scale replacement
• Printhead cover cleaning
• Printhead cleaning
• Ink Cartridge replacement
• Printhead replacement
• Rubber cleaning of Cap Unit
• Ink System Assy replacement
• Porous Pad re-installation
• Printer replacement
• PE Sensor Lever replacement
• PE Sensor replacement
• Ink tank replacement
Fatal error
" 1.3 Fatal Error Code
.
Major problem without error message
Poor Printing
cover
Wiper of Ink System Assy
Guide Front
(out of standard)
(Main Board replacement)
Poor Paper Loading
[Presumable Cause]
• Use of 3rd party media
• Edge guide mis-setting
• Foreign material
• Part come-off
• Contamination of LD Roller or
PF roller
[Major Troubleshooting]
• Recommendation of EPSON
media
• Edge guide re-setting
• Foreign material removal
• Part re-installation
• Roller replacement
[Presumable Cause]
• Foreign material
• Insufficient grease
•Gear damage
[Major Troubleshooting]
• Foreign material removal
• Lubrication of grease
• Gear replacement
[Phenomenon]
Blank printing
[Presumable Cause]
• Ink tube crumples
• Ink tube connection is
incomplete.
[Major Troubleshooting]
• Ink tank replacement
• Ink tube re-installation
Incomplete Initial Ink Charge
[Occurrence Condition]
Ink LED is ON and STM
indicates "Initial ink charging is
not complete".
[Major Occurrence Timing]
Print start timing.
[Troubleshooting]
Perform initial ink charge
Abnormal Noise
Blank printing
[Occurrence Condition]
This error occurs when
maintenance counter in EEPROM
exceeds the specified value.
[Major Occurrence Timing]
• Power-on timing
• Print start timing
• Cleaning timing
[Troubleshooting]
• Porous Pad replacement &
Maintenance counter reset
[Occurrence Condition]
This error occurs when top/
bottom of paper is not detected by
PE Sensor in the specified steps of
paper loading / ejecting operation
correctly.
[Major Occurrence Timing]
• Power-on timing
• Paper loading timing
• Paper eject timing
[Major Troubleshooting]
1 Perform paper eject operation
from operation panel.
• Success
•Fail
2 If fail in the above 1, remove
the paper by opening Printer
Cover.
3 Perform paper eject operation
from operation panel again.
• Success
•Fail
4 If fail in the above 3, check
foreign material / part comeoff / PE Sensor Lever / PE
Sensor / Main board.
Major problem with error message
Maintenance error
Paper Jam error
Starts paper feeding
operation again if printer has
print data.
Occurs paper jam error
again.
Starts paper feeding
operation again if printer has
print data.
Occurs paper jam error
again.
Ink End error
[Occurrence Condition]
This error occurs when ink
counter reaches ink end level.
[Major Occurrence Timing]
• Power-on timing
• Print start timing
• Cleaning timing
[Troubleshooting]
• Refill ink and reset ink counter
by panel.
No Paper error
[Occurrence Condition]
This error occurs when top of
paper can not be detected
correctly by PE Sensor in the
specified steps up to completion
of the paper loading operation.
(No paper / No loading / large
paper skew)
[Major Occurrence Timing]
• Paper loading timing
[Major Troubleshooting]
1 Set paper in ASF and perform
paper feed operation.
2 If the paper stops before
reaching PE Sensor, remove it
and check the paper condition.
3 A) If paper is OK, set paper in
ASF and move edge guides to
appropriate position, and
perform 2 again.
B) If damage in the above 2,
check foreign materials /
parts come-off / parts
transformation in paper
path.
4 If not resolved by 3-A & 3-B,
check foreign material / Part
come-off / surface condition of
LD Roller or PF Roller / PE
Sensor Lever / PE Sensor /
Main Board / PF Motor.
Paper Jam Fatal error
[Occurrence Condition]
This error occurs when CR Unit is
blocked by jammed paper.
[Major Occurrence Timing]
• Power-on timing
[Major Troubleshooting]
• Remove jammed paper
[NOTE]
On this product, if CR Unit
touches jammed paper, CR Unit
moves back in the opposite
direction so that customer can
remove the paper. However, if CR
Unit cannot move in this
sequence, this error occurs.
Double Feed error
[Occurrence Condition]
When manual duplex printing is
selected using the printer driver,
this error occurs if the actual
paper length detected by PE
Sensor does not match with the
paper length specified in the
printer driver. (The error occurs
when the actual length is longer
than the theoretical length
specified in the driver.)
[Major Occurrence Timing]
• Paper loading timing
• Paper eject timing
[Troubleshooting]
• PE Sensor Lever replacement
• PE Sensor replacement
(Main Board replacement)
• Main Board replacement
[NOTE]
This error may occur in the
manual duplex printing if the
inverted sheet printed on the first
side sticks to the second sheet
when the first side printing is
complete and the sheet is inverted
and set to ASF to print on the
other side.
Paper Size Unmatch error
[Occurrence Condition]
This error occurs if the actual
paper length detected by PE
Sensor does not match with the
paper length specified in the
printer driver. (The error occurs
no matter when the actual length
is longer or shorter than the
theoretical length specified in the
driver.)
[Major Occurrence Timing]
• Paper eject timing
[Troubleshooting]
• PE Sensor Lever replacement
• PE Sensor replacement
(Main Board replacement)
• Main Board replacement
*1: If the Hopper of ASF on the returned product touches the LD Roller, the initial ink charge has
not been completed for the product yet.
*2: 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.
*3: In case of “Not Trouble Found”, check fatal error code.
If the reason for the return is evident, first check the phenomenon user
claims recurs, then proceed to the troubleshooting.
This flowchart is compiled based on the following contents.
• Our experience regarding the quality problem.
• ESK’s repair data.
• Printer Mechanism specification for the product.
Troubleshooting Troubleshooting Workflow 10
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L120
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
Operation
1. Printhead initialization and fuse inspection
1-1.Initializes the Printhead, and checks for the fuse on the circuit boards in the printer.
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).
*1
*3
Revision A
CR Unit/PF Roller
movement and
position
*2
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
5-1.The CR Unit returns to its home position.
6. Low temperature operation sequence
6-1.The CR Unit quickly moves back and forth between near the Change Lever and near the Left Frame for two times.
*5
*4
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
o
C (41oF) by the thermistor on the Printhead.
Troubleshooting Power-On Sequence 11
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L120
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.
Revision A
Table 1-2. Condition 2: Power-on Sequence after Recovering from a Paper Jam Error
Operation
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.
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
*2
again.
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 (
into the paper jam fatal error for the third time.
CR Unit/PF Roller
movement and
position
*1
Table 1-2) twice, the printer turns
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
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L120
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)
Revision A
Error type
DC motor
error
Error
code
01H CR PID excess load error
02H CR PID excess speed error
03H CR PID reverse error
04H CR PID lock error
08H CR load position reverse error
09H CR load position excess speed error
0AH CR load position excess load error
F1H PF PID excess load error
F2H PF PID excess speed error
Error name Possible cause
• CR Motor failure
• 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)
• 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
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
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
• 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
failure)
• Main Board failure (Motor driver failure)
• CR Encoder failure (contaminated/detached scale, Encoder Sensor
failure)
• 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
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)
• 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)
• 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
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L120
Revision A
Table 1-3. Fatal Error List (Printer)
Error type
DC motor
error
Motor drive
time error
Printhead
system error
Sequence
error
Circuit error 80H Circuit error (include blowout of a fuse) • Main Board failure
Error
code
F3H PF PID reverse error
F4H PF PID lock error
F8H PF load position reverse error
F9H PF load position excess speed error
FAH PF load position excess load error
D1H CR (PID) driving time error • Main Board failure (Firmware failure)
D2H CR (load position) driving time error
D3H PF (PID) driving time error • Main Board failure (Firmware failure)
D4H PF (BS) driving time error
40H Transistor temperature error • Main Board failure
41H X-Hot detect error (pre printing)
42H X-Hot detect error (after flushing)
43H Head temperature error
50H Home position error
56H
5BH Insoluble paper jam error
Contact error at ink replacement timing
(Power-off)
Error name Possible cause
• PF Encoder failure (contaminated/detached scale, Encoder Sensor failure)
• Tooth skip of the PF Timing Belt
• 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
• PF drive mechanism overload (paper jam, foreign object, insufficient
grease, deformation of the Main Frame)
• Cable disconnection
• Main Board failure (Motor driver failure)
• PF Encoder failure (contaminated/detached scale, Encoder Sensor failure)
• Tooth skip of the PF Timing Belt
• Improper tension of the PF Timing Belt
• PF Encoder failure (contaminated/detached scale, Encoder Sensor failure)
• 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)
• Tooth skip of the PF Timing Belt
• Improper tension of the PF Timing Belt
• Cable disconnection
• Change Lever failure
• CR Motor failure
• Main Board failure (Motor driver failure)
• Change Lever failure
• CR Motor failure
• Main Board failure (Motor driver failure)
• Printhead failure
• Main Board failure
• Foreign object
• Deformation of the Main Frame
• Change Lever failure
• Paper jam
• Foreign object
• Ink Cartridges are not installed correctly
• Paper jam
• Foreign object
• Deformation of the Main Frame
• Change Lever failure
• Paper jam
Troubleshooting Fatal Error Code List 14
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CHAPTER 2
DISASSEMBLY/REASSEMBLY
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L120
Before folding
Fold here
Clip
40 mm or more
After folding
Fold appropriate length
to hitch a spring.
Clip
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.
Revision A
2.1.2 Jigs
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.
Figure 2-1. Making the Spring Hook Jig
Disassembly/Reassembly Overview 16
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Page 17
L120
1
2
Front
Right
3 4
7
Rear
8
6
Left
5
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
Revision A
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
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Page 18
L120
1
2
3
5
8 11
7
10
4
9
6
9
7
8
6
5
4
3
1
2
Printer mechanism
No. Name No. Name
1 CR Driven Pulley Assy (p30) 6 Adapter (p31)
2 CR Scale (p30) 7 CR Unit (p32)
Revision A
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
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
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Page 19
L120
6
1
2
3
5 4
1
2
4
3
5
6
Revision A
No. Name No. Name
1 PF Encoder Sensor* (p29) 4 PF Scale (p29)
2 EJ Roller (p31) 5 PF Timing Belt (p29)
3 EJ Roller Gear (p29) 6 PF Motor Assy (p32)
Figure 2-5. Printer Mechanism: Left
No. Name No. Name
1 CR Motor (p30) 4 PE Sensor Lever (p30)
2 Head FFC (p32) 5 PS Unit (p29)
3 Main Board Assy (p30) 6 Waste Ink Pad Assy (p29)
Figure 2-6. Printer Mechanism: Rear
Disassembly/Reassembly Overview 19
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Page 20
L120
4
2
3
1
Ink Supply Tank Assy
No. Name No. Name
Revision A
1 Ink Supply Tank Tube Assy (p31)
2 Ink Supply Tube Assy (p31)
3 Ink Supply Tank Lower Housing (p31)
Ink Supply Tank
4
Ink Supply Tank (p31)/Ink Supply Tank (p31)/Ink
Supply Tank (p31)/Ink Supply Tank (p31)
Figure 2-7. Ink Supply Tank Assy
Disassembly/Reassembly Overview 20
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Page 21
L120
2.1.4 Standard Operation Time for Servicing the Product
The following are the standard operation time for servicing the product. Those are based on the MTTR result
measured using a prototype.
The underlined parts/units are supplied as After Service Parts.
Table 2-1. Standard Operation Time
Time (mm:ss)
Parts/Unit
Replacement
Ink Supply Tank Upper Housing 0:35 --- 0:35
Paper Support Assy
Printer Cover
Waste Ink Pad Assy
Paper Back Lever
Retard Roller Assy
Ink Supply Tank Assy 1:03 --- 1:03
Ink Supply Tank
Ink Supply Tank Tube Assy
Ink Supply Tank Lower Housing 2:35 --- 2:35
Housing Upper Assy 1:56 --- 1:56
Housing Upper
Buttons
PS Unit
Cap Assy
Porous Pad for Cap Assy 3:18 --- 3:18
PF Encoder Sensor 2:35 --- 2:35
PF Scale
PF Grounding Spring 2:54 --- 2:54
PF Driven Pulley Assy 3:40 1:10 4:50
PF Timing Belt 3:58 1:10 5:08
FFC Holder 2:10 --- 2:10
EJ Roller Gear
CR Scale
Hopper
Shield Plate 3:31 --- 3:31
LD Roller Assy
CR Motor
PE Sensor Lever
Main Board Assy
LD Roller Cover 2:44 --- 2:44
Transistor Cover 3:28 --- 3:28
CR Driven Pulley Assy 3:19 3:07 6:26
Main Frame Assy 10:21 --- 10:21
Paper Guide Upper Assy
Head FFC
EEPROM Data Copy OK 4:12 1:10 5:22
EEPROM Data Copy NG 4:12 27:58 32:10
0:02 --- 0:02
0:09 --- 0:09
0:44 0:65 1:49
1:46 --- 1:46
1:53 0:47 2:40
0:51 --- 0:51
1:31 --- 1:31
2:05 --- 2:05
2:22 --- 2:22
2:16 --- 2:16
3:12 --- 3:12
2:48 --- 2:48
2:23 --- 2:23
2:45 --- 2:45
2:41 5:03 7:44
4:11 0:47 4:58
6:07 --- 6:07
5:02 0:47 5:49
10:04 7:21 17:25
10:21 --- 10:21
Adjustment/
inspection
Revision A
Total
Disassembly/Reassembly Overview 21
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Page 22
L120
Table 2-1. Standard Operation Time
Time (mm:ss)
Parts/Unit
Replacement
CR Unit 9:55 --- 9:55
CR Timing Belt
CR Encoder Sensor 6:30 --- 6:30
Frame Base Assy 10:21 --- 10:21
Pump Unit
Spur Gear 16.5 12:47 --- 12:47
PF Roller Unit
PF Motor Assy
Frame Base 15:55 --- 15:55
Tube Guide Sheet Sub
Joint
Tube Pressing Plate
Star Wheel Holder Assy
EJ Roller
Ink Supply Tube Assy
Tube Guide Sheet
Adapter
Holder Board
Printhead
Cap Tank
6:28 --- 6:28
12:23 --- 12:23
15:08 5:51 20:59
15:55 1:08 17:03
2:26 --- 2:26
4:16 --- 4:16
2:12 --- 2:12
2:46 3:18 6:04
3:21 3:18 6:39
3:30 --- 3:30
2:58 --- 2:58
2:43 --- 2:43
2:58 --- 2:58
4:46 17:39 22:25
0:57 --- 0:57
Adjustment/
inspection
Total
Revision A
Disassembly/Reassembly Overview 22
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Page 23
L120
Ink Supply Tank Assy
Ink Supply Tank Assy
Air release hole
Do not place the Ink Supply Tank Assy with the air release hole down or to one of the sides. Otherwise, the ink in the Ink Supply
Tank Assy may come up to the hole and may leak or the print failure may occur.
OK
NG
Ink Supply Tank Assy
2.1.5 Checks and Precautions before Disassembling
2.1.5.1 Factors which Affect the Print Quality
HOW TO PLACE THE INK TANK ASSY WHEN DISASSEMBLING/REASSEMBLING
The Ink Supply Tank Assy of this printer has an air release hole on the upper part.
The ink in the ink tanks is vented to the atmosphere through this hole to stabilize ink supply to the Printhead. If
the Ink Supply Tank Assy is tilted, the ink in the tanks may leak from the air release hole. If the air release hole is
sealed up with the leaked ink, ventilation to the atmosphere cannot be done properly and the print quality may be
affected adversely.
In order to prevent this from happening, make sure to place the Ink Supply Tank Assy as shown below after
removing it.
Revision A
Figure 2-8. How to Place the Ink Tank Assy
Disassembly/Reassembly Overview 23
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Page 24
L120
A
C
B
Joint Ink Supply Tank Assy
Ink Supply Tank Tube Assy Ink Supply Tube Assy
Adapter
2.1.5.2 Factors which Affect the Safety of Service Personnel such as Ink Leakage during Operation
Ink may spill when removing the following parts from L120.
This section describes the parts that may cause ink spill and the means to minimize the ink spill when removing
the parts.
THE PARTS THAT MAY CAUSE INK SPILL WHEN REMOVING
Parts When ink may spill Location
Joint Removing the Ink Supply Tank Tube Assy / Ink Supply Tube Assy from the Joint A
Revision A
Ink Supply
Tank
Ink Supply
Tank Tube Assy
Adapter Removing the Ink Supply Tube Assy from the Adapter C
Ink Supply
Tube Assy
Note : These parts are indicated with the icon in disassembly/reassembly flowchart. (See "2.2 Disassembly/Reassembly Procedures
(p28)".)
• Removing the tubes of the Ink Supply Tank Tube Assy from the Joint
• Removing the tubes of the Ink Supply Tank Tube Assy from the Ink Supply Tank
• Removing the Ink Supply Tank Tube Assy / Ink Supply Tube Assy from the Joint
• Removing the Ink Supply Tube Assy from the Adapter
A, B
A, C
Figure 2-9. Location
Disassembly/Reassembly Overview 24
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Page 25
L120
Carriage
Film
Adapter
MEANS TO MINIMIZE THE INK SPILL
Even observing the points described in this section, ink may spill in the following situations.
Therefore, be careful not to contaminate the inside of the printer or its surroundings by
preparing the container to receive the leaked ink, or the like.
When removing the Ink Supply Tube Assy, all the ink in the tube will spill.
Adapter is removed
When disassembling/reassembling the Adapter, take care not to press the film on the Adapter.
Revision A
Figure 2-10. Adapter
Disassembly/Reassembly Overview 25
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Page 26
L120
Ink Supply Tank
Ink Supply Tank Tube
Container for discharged ink
Clip
DISCHRGING INK FROM THE INK SUPPLY TANK
Discharging ink is recommended only when disconnecting the Ink Supply Tank Tube Assy from the Ink Supply
Tank. Before performing the above disconnection, discharge ink from the Ink Supply Tank as follows.
Necessary tools
Containers (x 4) for each discharged ink
Clip (x 4)
Cotton swab (x 4)
When disconnecting the Ink Supply Tube/Ink Supply Tank Tube from the Joint, ink may
leak from the ink tube. Prepare a container to receive the leaking ink to prevent the
product from getting contaminated by the leaked ink.
After the Ink Supply Tube is disconnected from the Joint, insert a cotton swab into the
end of the Ink Supply Tube to prevent ink from leaking.
Discharging procedure
1. Remove the Ink Supply Tank Upper Housing/Housing Upper Assy/Tube Pressing Plate.
2. To minimize the ink leakage from the Ink Supply Tube/Ink Supply Tank Tube, pinch the Ink Supply
Tube/Ink Supply Tank Tube with clips (x 2).
Revision A
3. Disconnect the Ink Supply Tank Tube from the Joint, and remove the Ink Supply Tank Assy from the
printer.
4. Put the Ink Supply Tank Assy on a box or the like to keep the assy higher than the container, and insert
the tip of the Ink Supply Tank Tube of the color you want to discharge the ink from into the container.
5. Put the Ink Supply Tank of the ink to discharge on the other Ink Supply Tanks and remove the Cap Tank.
6. Move the clips (x 2) so that only the ink to discharge can flow in the Ink Supply Tank Tube.
7. The ink in the Ink Supply Tank is discharged into the container through the Ink Supply Tank Tube.
8. Repeat Step 4 to Step 7 for all ink tanks to discharge all ink in the Ink Supply Tank.
Figure 2-11. Discharging Ink
Disassembly/Reassembly Overview 26
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Page 27
L120
Ink supply hole
Ink Supply Tank Assy
Revision A
It is recommended that the ink in the Ink Supply Tank should be discharged completely
before proceeding to disassembling/reassembling.
After all the reassembling work is complete, the discharged ink of each color should be
refilled back to the Ink Supply Tank before performing the adjustment. Confirm the
colors indicated on the film of the Ink Supply Tank so as not to mistake them, and make
sure to refill each ink back to the correct tank from the corresponding ink supply hole.
Disassembly/Reassembly Overview 27
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Page 28
L120
Housing Upper
1
4
(p22) (p43)
Frame Base Assy
---
---
(p21) (p27)
Paper Guide
Upper Assy (p29)
CR Timing Belt
FFC/ Cable *5
Shows necessary
procedures before removing
the following parts.*
Black letters indicate a part/
unit not supplied as an ASP.
Item Description Reference
Parts/unit name
White-letter
Part/unit supplied as an ASP ---
Black-letter
Part/unit not supplied as an ASP ---
Icon
Indicates a practice or condition that could result in
injury or loss of life if not strictly observed.
Indicates the reference page in
blue-letter
Indicates a practice or condition that could result in
damage to, or destruction of equipment if not strictly
observed.
Indicates the reference page in
blue-letter
Indicates the parts that are inevitably broken in the
disassembling procedure, and should be replaced with
a new one for reassembly.
Indicates the reference page in
blue-letter
Indicates the parts that may cause the ink spill when
they are removed.
"2.1.5 Checks and Precautions
before Disassembling (p23)"
Indicates necessary check items in the disassembling/
assembling procedure.
Indicates the reference page in
blue-letter
Indicates supplementary explanation for disassembly
is given.
Indicates the reference page in
blue-letter
Indicates particular tasks to keep quality of the units
are required.
Indicates the reference page in
blue-letter
Indicates particular routing of cables is required.
Indicates the reference page in
blue-letter
Indicates particular adjustment(s) is/are required. Chapter 3 " Adjustment (p42)"
Indicates lubrication is required.
Chapter 4 " Maintenance
(p52)"
Indicates the number of screws securing the parts/
units.
---
Indicates the points secured with other than a screw
such as a hook, rib, dowel or the like.
---
White letters indicate a
part/unit supplied as an
ASP.
Shows the screw types and
the specified torque on the
“Screw type/torque list”.
Reference page
Shows removal/installation
as a unit/assy. is available.
The name enclosed in gray
indicate a part/unit that
must be removed on the
way to the target parts.
Note "*": The box with only part names means the removal of the parts. If the name of
FFC or a cable is shown, disconnect the FFC or cable from the connector.
Shows the procedure
number on the “FFC/
cable list”.
2.2 Disassembly/Reassembly Procedures
This section describes procedures for disassembling the parts/units in a flowchart format. For some parts/units,
detailed procedures or precautions are provided (accordingly indicated by icons and cell's color). Refer to the
explanations in the example chart below and perform an appropriate disassembling and assembling procedure.
(See "2.3 Detailed Disassembly/Reassembly Procedure for each Part/Unit (p34) ".)
For routing cables, see "2.4 Routing FFCs/cables (p40)".
The example below shows how to see the charts on the following pages.
S4
Revision A
Disassembly/Reassembly Disassembly/Reassembly Procedures 28
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Page 29
L120 Revision A
2.2.1 Disassembly Flowchart
START
Cap Tank
---
Ink Supply Tank
Upper Housing
S4
(p 37)
Housing Upper
Assy
S5
(p 34)
(p 29)
B
Paper Support
Assy
---
---
Paper Support
Joint
---
Printer Cover
---
Waste Ink Pad
Assy
1
PF Encoder
Sensor*
Note "*": Proceed to the next step
with the part detached
temporarily because the
1
part cannot be removed
fully there.
2
---
1
---
3
---
2
S5
(p 34) (p 42)
2
(p 36) (p 40)
S2
---
Extension Spring (x2)
Paper Back
2
2
Lever
---
2
(p 52)
Retard Roller
4
Assy
---
3
1
(p 31)
2
(p 42)
PF Scale
(p 36)
PF Driven Pulley
Assy
S7
(p 35) (p 42)
---
---
1
1
PF Grounding
Spring
---
1
(p 34)
A
(p 30)
Cable (CN501)
PS Unit
(p 34) (p 40)
(p 42)
Extension Spring (2)
EJ Roller Gear
---
FFC Holder
---
Pump Tube
B
C
Cap Assy
---
---
(p 34) (p 52)
(p 40)
2
1
---
(p 29)
(p 31)
3
(p 35)
Cap Lever
---
---
(p 35)
Porous Pad for
Cap Assy
---
---
---
Ink Supply Tank Tube
Assy
Ink Supply Tank
Assy
---
---
---
PF Timing Belt
---
---
(p 42)
2
(p 31)
Screw type/torque list
Symbol Screw Type Torque
S1
C.B.P-TITE SCREW 2.6x5 F/ZN-3C 2.55 0.05 kgf·cm
S2
C.B.P-TITE SCREW 2x8 F/ZN-3C 2.55 0.05 kgf·cm
S3
S4
S5
S6
S7
S8
S9
S10
S11
S12
S13
C.B.P-TITE SCREW 2x8 F/ZN-3C 2
C.B.P-TITE SCREW 3x10 F/ZB-3C 6 1 kgf·cm
C.B.P-TITE SCREW 3x10 F/ZN-3C 6
C.B.P-TITE SCREW 3x10 F/ZN-3C 7 1 kgf·cm
C.B.S-TITE (P2) SCREW 3x6 F/ZN-3C 7
C.B.S-TITE (P2) SCREW 3x6 F/ZN-3C 8 1 kgf·cm
C.B.S-TITE SCREW 3x6 F/ZN-3C 6
C.B.S-TITE SCREW 3x6 F/ZN-3C 7.3 0.1 kgf·cm
C.B.S-TITE SCREW 3x8 F/ZN-3C 7.3
C.P SCREW 2.6x3 F/ZN-3C 4 0.5 kgf·cm
C.P.S-TITE (S-P1) SCREW 3x6 F/ZN-3C 7.5
0.5 kgf·cm
1 kgf·cm
1 kgf·cm
1 kgf·cm
0.1 kgf·cm
0.5 kgf·cm
Flowchart 2-1. Disassembly Flowchart (1)
Disassembly/Reassembly Disassembly Flowchart 29
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Page 30
L120 Revision A
(p 29)
A
PF Encoder
Sensor* (p29)
PF Scale (p29)
CR Scale (p30)
Transistor Cover
(p30)
CR Driven Pulley
Assy (p30)
LD Roller Cover
(p30)
FFC/Cable* 1
Extension Spring (x3)
Main Frame Assy
S9
(p 36) (p 42)
(p 52)
Extension spring
CR Scale
---
2
(p 34)
Paper Support
Assy (p29)
Hopper
(p 42)
FFC/Cable* 2
LD Roller Cover
1
---
2
S5
---
---
Transistor Cover
---
4
(p 39)
CR Timing Belt
CR Driven Pulley
Assy
Shield Plate
2
5
---
S9
---
1
3
(p 32)
LD Roller Cover
(p30)
LD Roller Assy
(p 35) (p 42)
(p 52)
---
S13
(p 36) (p 42)
(p 52)
2
1
4
Frame Base Assy
(p 42)
FFC/cable list
---
---
4
(p 32)
CR Timing Belt
FFC/Cable* 3
CR Motor
S12
(p 41) (p 42)
LD Roller Cover
(p30)
Extension Spring
2
---
PE Sensor Lever
---
3
(p 42)
PF Encoder Sen-
sor* (p29)
FFC/Cable* 4
Main Board Assy
S10 S11
(p 34) (p 40)
(p 42)
3
---
No. FFC/Cable No. FFC/Cable
Remove/disconnect the
following.
PF Motor cable (CN13)
1
PS Unit cable (CN501)
CR Motor cable (CN12)
Remove/disconnect the
following.
2
PF Motor cable (CN13)
PS Unit cable (CN501)
Release the CR Motor cable
from the hooks of the Main
Frame and Frame Base.
3
Remove/disconnect all FFCs/
cables.
4
Screw type/torque list
Symbol Screw Type Torque
S1
C.B.P-TITE SCREW 2.6x5 F/ZN-3C 2.55 0.05 kgf·cm
S2
C.B.P-TITE SCREW 2x8 F/ZN-3C 2.55 0.05 kgf·cm
S3
S4
S5
S6
S7
S8
S9
S10
S11
S12
S13
C.B.P-TITE SCREW 2x8 F/ZN-3C 2
C.B.P-TITE SCREW 3x10 F/ZB-3C 6 1 kgf·cm
C.B.P-TITE SCREW 3x10 F/ZN-3C 6
C.B.P-TITE SCREW 3x10 F/ZN-3C 7 1 kgf·cm
C.B.S-TITE (P2) SCREW 3x6 F/ZN-3C 7
C.B.S-TITE (P2) SCREW 3x6 F/ZN-3C 8 1 kgf·cm
C.B.S-TITE SCREW 3x6 F/ZN-3C 6
C.B.S-TITE SCREW 3x6 F/ZN-3C 7.3 0.1 kgf·cm
C.B.S-TITE SCREW 3x8 F/ZN-3C 7.3
C.P SCREW 2.6x3 F/ZN-3C 4 0.5 kgf·cm
C.P.S-TITE (S-P1) SCREW 3x6 F/ZN-3C 7.5
0.5 kgf·cm
1 kgf·cm
1 kgf·cm
1 kgf·cm
0.1 kgf·cm
0.5 kgf·cm
Flowchart 2-2. Disassembly Flowchart (2)
Disassembly/Reassembly Disassembly Flowchart 30
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Page 31
L120 Revision A
(p 29)
C
Ink Supply Tube Assy
Adapter
(p 39)
Holder Board
---
Head FFC
Printhead
S6
(p 35) (p 42)
(p 29)
2
Ink Supply Tube Assy
Ink Supply Tank Tube Assy
Tube Guide
Sheet Sub
---
2
(p 38)
---
1
Joint
---
8
(p 38)
Tube Pressing
Plate (p31)
---
2
Tube Guide
Sheet
---
---
(p 38)
Tube Pressing
Plate
S1
(p 38)
Joint (p31)
Tube Guide
Sheet (p31)
Star Wheel
Holder Assy
S5
(p 42)
1
1
Ink Supply Tube
Assy
---
8
(p 38)
2
---
3
1
EJ Roller Gear
(p29)
Cap Tank (p29)
Ink Supply Tank Tube Assy
Ink Supply Tank
(p 37)
Ink Supply Tank
(p31)
Ink Supply Tank
(p31)
Ink Supply Tank
(p31)
Ink Supply Tank
Tube Assy
(p 37)
---
---
Ink Supply Tank Tube Assy
Ink Supply Tank
---
4
(p 37)
4
Ink Supply Tank Tube Assy
Ink Supply Tank
(p 37)
---
Ink Supply Tank Tube Assy
Ink Supply Tank
---
4
(p 37)
4
8
EJ Roller
1
Printer Cover
(p29)
Buttons (p31)
Housing Upper
---
(p 29)
---
---
Buttons
S5
---
---
1
(p 42) (p 52)
Ink Supply Tank
Lower Housing
---
---
---
Screw type/torque list
Symbol Screw Type Torque
S1
C.B.P-TITE SCREW 2.6x5 F/ZN-3C 2.55 0.05 kgf·cm
1
2
S2
S3
S4
S5
S6
S7
S8
S9
S10
S11
S12
S13
C.B.P-TITE SCREW 2x8 F/ZN-3C 2.55 0.05 kgf·cm
C.B.P-TITE SCREW 2x8 F/ZN-3C 2
0.5 kgf·cm
C.B.P-TITE SCREW 3x10 F/ZB-3C 6 1 kgf·cm
C.B.P-TITE SCREW 3x10 F/ZN-3C 6
1 kgf·cm
C.B.P-TITE SCREW 3x10 F/ZN-3C 7 1 kgf·cm
C.B.S-TITE (P2) SCREW 3x6 F/ZN-3C 7
1 kgf·cm
C.B.S-TITE (P2) SCREW 3x6 F/ZN-3C 8 1 kgf·cm
C.B.S-TITE SCREW 3x6 F/ZN-3C 6
1 kgf·cm
C.B.S-TITE SCREW 3x6 F/ZN-3C 7.3 0.1 kgf·cm
C.B.S-TITE SCREW 3x8 F/ZN-3C 7.3
0.1 kgf·cm
C.P SCREW 2.6x3 F/ZN-3C 4 0.5 kgf·cm
C.P.S-TITE (S-P1) SCREW 3x6 F/ZN-3C 7.5
0.5 kgf·cm
Flowchart 2-3. Disassembly Flowchart (3)
Disassembly/Reassembly Disassembly Flowchart 31
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Page 32
L120 Revision A
(p 30) (p 30)
3 4
Cap Assy (p29)
Shield Plate
(p30)
Main Board Assy
(p30)
PE Sensor Lever
(p30)
Paper Guide
Upper Assy
(p 42)
Pump Tube
Pump Unit
CR Motor (p30)
FFC/Cable* 5
CR Unit
---
Antistatic Cloth
S8
---
---
1
1
S5
(p 36)
PF Grounding
Spring (p29)
1
---
---
6
(p 41) (p 42)
FFC Holder
(p29)
Head FFC
---
---
CR Timing Belt
---
(p 36) (p 42)
CR Encoder
Sensor
1
1
S3
(p 37) (p 40)
1
Spur Gear 16.5
---
EJ Roller Gear
(p29)
PF Driven Pul-
---
---
ley Assy (p29)
(p 40)
PF Timing Belt
(p29)
PF Roller Unit
---
2
(p 42) (p 52)
PF Motor Assy
1
S5
(p 40) (p 42)
---
Frame Base
---
---
(p 42) (p 52)
Flowchart 2-4. Disassembly Flowchart (4)
FFC/cable list
No. FFC/Cable
Disconnect the CR Encoder FFC.
5
Pull out the Head FFC from the hole of the CR Unit.
Screw type/torque list
Symbol Screw Type Torque
S1
C.B.P-TITE SCREW 2.6x5 F/ZN-3C 2.55 0.05 kgf·cm
S2
C.B.P-TITE SCREW 2x8 F/ZN-3C 2.55 0.05 kgf·cm
S3
S4
S5
S6
S7
S8
S9
S10
S11
S12
S13
C.B.P-TITE SCREW 2x8 F/ZN-3C 2
C.B.P-TITE SCREW 3x10 F/ZB-3C 6 1 kgf·cm
C.B.P-TITE SCREW 3x10 F/ZN-3C 6
C.B.P-TITE SCREW 3x10 F/ZN-3C 7 1 kgf·cm
C.B.S-TITE (P2) SCREW 3x6 F/ZN-3C 7
C.B.S-TITE (P2) SCREW 3x6 F/ZN-3C 8 1 kgf·cm
C.B.S-TITE SCREW 3x6 F/ZN-3C 6
C.B.S-TITE SCREW 3x6 F/ZN-3C 7.3 0.1 kgf·cm
C.B.S-TITE SCREW 3x8 F/ZN-3C 7.3
C.P SCREW 2.6x3 F/ZN-3C 4 0.5 kgf·cm
C.P.S-TITE (S-P1) SCREW 3x6 F/ZN-3C 7.5
0.5 kgf·cm
1 kgf·cm
1 kgf·cm
1 kgf·cm
0.1 kgf·cm
0.5 kgf·cm
Disassembly/Reassembly Disassembly Flowchart 32
Confidential
Page 33
L120 Revision A
2.2.2 Disassembly Flowchart (Printhead/Main Board)
Printhead Main Board
START START
Cap Tank
---
Ink Supply Tank
Upper Housing
S4
(p 37)
Housing Upper
Assy
S5
(p 34)
Ink Supply Tube Assy
Adapter
(p 39)
Holder Board
---
Head FFC
---
2
Printhead
3
S6
(p 35) (p 42)
1
2
2
Cap Tank
---
Ink Supply Tank
Upper Housing
S4
(p 37)
---
2
2
2
Housing Upper
Assy
4
3
S5
(p 34)
4
3
FFC/Cable* 6
Shield Plate
S9
---
PF Encoder
Sensor*
S2
(p 36) (p 40)
FFC/Cable* 7
Main Board Assy
2
1
Note "*": Proceed to the next step with the part
1
---
detached temporarily because the
part cannot be removed fully there.
3
Paper Support
Assy
---
---
2
---
1
S10 S11
(p 34) (p 40)
(p 42)
---
FFC/cable list
No. FFC/Cable
Remove/disconnect the following.
6
PF Motor cable (CN13)
PS Unit cable (CN501)
Hopper
---
---
2
(p 42)
2
7 Remove/disconnect all FFCs/cables.
Screw type/torque list
Symbol Screw Type Torque
S1
C.B.P-TITE SCREW 2.6x5 F/ZN-3C 2.55 0.05 kgf·cm
S2
C.B.P-TITE SCREW 2x8 F/ZN-3C 2.55 0.05 kgf·cm
S3
S4
S5
S6
S7
S8
S9
S10
S11
S12
S13
C.B.P-TITE SCREW 2x8 F/ZN-3C 2
C.B.P-TITE SCREW 3x10 F/ZB-3C 6 1 kgf·cm
C.B.P-TITE SCREW 3x10 F/ZN-3C 6
C.B.P-TITE SCREW 3x10 F/ZN-3C 7 1 kgf·cm
C.B.S-TITE (P2) SCREW 3x6 F/ZN-3C 7
C.B.S-TITE (P2) SCREW 3x6 F/ZN-3C 8 1 kgf·cm
C.B.S-TITE SCREW 3x6 F/ZN-3C 6
C.B.S-TITE SCREW 3x6 F/ZN-3C 7.3 0.1 kgf·cm
C.B.S-TITE SCREW 3x8 F/ZN-3C 7.3
C.P SCREW 2.6x3 F/ZN-3C 4 0.5 kgf·cm
C.P.S-TITE (S-P1) SCREW 3x6 F/ZN-3C 7.5
0.5 kgf·cm
1 kgf·cm
1 kgf·cm
1 kgf·cm
0.1 kgf·cm
0.5 kgf·cm
Flowchart 2-5. Disassembly Flowchart (Printhead/Main Board)
Disassembly/Reassembly Disassembly Flowchart (Printhead/Main Board) 33
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Page 34
L120 Revision A
Top
Housing Upper Assy
C.B.P-TITE SCREW 3x10 F/ZN-3C (6 ± 1 kgf·cm)
Right side
Bottom
Hook
Right side
Ink Supply
Tank Tube Assy
Do not pinch.
Black triangle mark
Slit of CR Encoder Sensor
CR Unit
Extension spring
CR Scale
PS Unit
Hook
Rib
Bottom
Widen this rib to release the hook of PS Unit.
C.B.P-TITE SCREW 3x10 F/ZN-3C (6 ± 1 kgf·cm)
Hook and hole
Frame Base
Waste Ink Pad Assy
Bottom
Waste Ink Pad Assy
Rear
Rib and hole
PE Sensor Lever
Main Board AssyPE Sensor
1
2
3
EJ Roller Gear
Can not be reused because the rib
of the EJ Roller Gear is deformed
once removed from the EJ Roller.
Insert spring leg
A into groove.
PF Grounding
Spring
Left
Main Frame
Spring leg B
Cutout
PF Grounding
Spring
Spring leg B
Spring leg A
Frame Base
Assy
Hole
2.3 Detailed Disassembly/Reassembly Procedure for each Part/Unit
Housing Upper Assy
Release the hooks shown above when removing the Housing Upper Assy.
When installing the Housing Upper Assy, take care not to let the Ink Supply Tank Tube Assy get pinched.
Tighten the screws in the order indicated in the figure above.
CR Scale
Attach the CR Scale to the hook on the left of the Main Frame
with the black triangle mark upward.
Make sure to put the CR Scale through the slit of the CR
Encoder Sensor.
PS Unit
Be careful not to damage the rib of the Frame Base when widen the
rib to release the hook of the PS Unit.
When removing the PS Unit, follow the procedure below.
1. Using a precision screwdriver or the like, widen the rib of the
Frame Base to release the hook of the PS Unit.
2. Remove the PS Unit from the Frame Base in the direction of
the arrow while releasing the rib of the PS Unit.
3. Disconnect the PS Unit cable from the connector on the PS
Unit and remove the PS Unit.
Waste Ink Pad Assy
When installing the Waste Ink Pad Assy, follow the procedure
below.
1. Place the Waste Ink Pad Assy under the Frame Base.
2. Slide the Waste Ink Pad Assy in the direction of the arrow to
align the hole of the Waste Ink Pad Assy with the hook of the
Disassembly/Reassembly Detailed Disassembly/Reassembly Procedure for each Part/Unit 34
Frame Base.
3. Confirm the following first, and then tighten the screw to
secure the Waste Ink Pad Assy.
• The rib of the Waste Ink Pad Assy is correctly inserted into
the hole of the Frame Base.
• The Waste Ink Pad Assy is secured firmly with the hook of
the Frame Base.
Install the Main Board Assy with the PE Sensor Lever to the
rear. After installing the Main Board Assy, make sure the lever
part of the PE Sensor Lever is aligned with the slit of the PE
Sensor.
Tighten the screws in the order indicated in the figure above.
Main Board Assy
EJ Roller Gear
The rib on the contact point of the EJ Roller Gear with the EJ
Roller is deformed when removing the EJ Roller Gear. Therefore,
make sure to replace it with a new one when removing it in order to
maintain the paper feed accuracy.
PF Grounding Spring
When installing the PF Grounding Spring, follow the procedure below.
1. From the left side of the printer, insert the spring leg A of the
PF Grounding Spring into the hole of the Frame Base.
2. Insert the spring leg B of the PF Grounding Spring into the
groove of the Frame Base.
3. Attach the spring leg B of the PF Grounding Spring to the
cutout of the Main Frame to install the PF Grounding Spring.
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Page 35
L120 Revision A
LD Roller Assy
Paper Back Lever
Change Lever
Cam
Main Frame
Rear of printer
LD Roller
LD Roller Shaft
Extension Spring
Clutch
Spur gear
2 1
3
Main Frame
Printhead
CR Unit
C.B.P-TITE SCREW 3x10 F/ZN-3C (7 ± 1 kgf·cm)
Pinion gear of PF Motor
Hook
PF Motor Frame
Dowel
Rib
PF Driven Pulley Assy
Protrusion
Compression Spring 5.07
Combination Gear 29.2,42
PF Timing Belt
PF Driven Pulley Assy
C.B.S-TITE(P2) SCREW 3x6 F/ZN-3C
P.W. 3.4x0.43x7 (7 ± 1 kgf·cm)
Cap Lever
Extension Spring 1.329
Cap Assy
Extension Spring 0.65
Hook of Cap Assy
Hook of Frame Base
Step 6
Shaft BShaft A
Shaft C
Cap Assy
Step 2
Make sure the marking (10 ± 1 mm
from the tube end) on the tube cannot
be seen when viewed from the side.
Cap Slider
CutoutHole B
Cap Lever
Frame
Base
Hole A
Hole C
Step 1, 3-5
Hook of Frame Base
Hook of Cap Lever
Step 7
LD Roller Assy (1)
Install the LD Roller Assy with the following condition in order to avoid the Change Lever and Paper Back Lever.
Using a screw driver or the like, hold the Paper Back Lever to the rear as shown above not to let it touch the LD Roller Assy.
Push the Change Lever to the front to keep it in the hole of the Main Frame.
LD Roller Assy (2)
If each part shown above comes off when removing the LD Roller
Assy, attach them back in place as shown in the figure above.
Printhead
When removing/replacing the Printhead, do not apply excess
downward force when tightening the screws. Otherwise, the Main
Frame may be deformed by the applied perpendicular force when
screwing, and the print quality may be affected adversely.
Tighten the screws of the Printhead in the order indicated in the
figure above while pressing the Printhead in the direction of the
arrow.
PF Driven Pulley Assy / PF Timing Belt
When installing the Cap Lever/Cap Assy, follow the procedure below.
1. Attach the Cap Lever to the Frame Base, and attach one end of the Extension Spring 0.65 to the hook of the Frame Base.
2. Connect the tube of the Pump Unit to the joint on the bottom of the Cap Assy. Then, viewing from the side, confirm the marking (10
from the tube end) on the tube is covered by the Cap Slider.
3. Insert the shaft A of the Cap Assy through the hole of the Cap Lever to the hole A of the Frame Base.
4. Insert the shaft B of the Cap Assy through the cutout of the Frame Base and to the hole B of the Frame Base.
5. Insert the shaft C of the Cap Assy to the hole C of the Frame Base.
6. Using a “spring hook jig” (p 16), attach the other end of the Extension Spring 0.65 to the hook of the Cap Assy.
7. Attach the Extension Spring 1.329 to the hooks of the Cap Lever and Frame Base.
Do not hold the PF Driven Pulley Assy when securing it with the screw in order to prevent applying improper tension to the PF Timing Belt.
When installing the PF Driven Pulley Assy, follow the procedure below.
1. Align the rib of the PF Driven Pulley Assy with the hook of the PF Motor Frame, and install the PF Driven Pulley Assy.
Disassembly/Reassembly Detailed Disassembly/Reassembly Procedure for each Part/Unit 35
2. Attach the Compression Spring 5.07 to the protrusion of the PF Driven Pulley Assy and the dowel of the PF Motor Frame.
3. Attach the PF Timing Belt in the order of the pinion gear of the PF Motor, PF Driven Pulley and Combination Gear 29.2,42.
4. Rotate the Combination Gear 29.2,42 clockwise three times to confirm the PF Timing Belt is correctly attached, and then secure the PF Driven
Pulley Assy with the screw and washer to the PF Motor Frame.
Cap Lever/Cap Assy
Confidential
1 mm
Page 36
L120 Revision A
3
5
Align the screw holes of Main
Frame and PF Motor Frame.
PF Motor Frame
Main Frame
4
Tighten screw while pressing Main
Frame in the direction of the arrow.
C.B.P-TITE SCREW 3x10 F/ZN-3C (6 ± 1 kgf·cm)
C.B.S-TITE SCREW 3x6 F/ZN-3C (6 ± 1 kgf·cm)
1
2
Main Frame Assy
Change Lever must not
interfere with Main Frame.
Rib and groove
Positioning hole and dowel
Section A
Main Frame
Rib
CR Driven Pulley Assy
Dowel
Compression Spring 13.98
CR Timing Belt
Pinion gear of CR Motor
Main Frame
C.P.S-TITE (S-P1) SCREW 3x6 F/ZN-3C (7 ± 0.5 kg·fcm)
PF Scale
PF Encoder Sensor
PF Roller
PF Encoder Sensor
PF Scale
PF Roller
Step 4 Pump
Tube B
Marking
8 ± 1 mm
Hole of Frame Base
Hole of
Frame Base
Pump
Tube A
Step 1-2
Pump Unit
Route Pump Tube A through ribs of Frame
Base with their dashed line facing upward.
Insert Pump Tube B up to the marking (8 ± 1 mm
from tube end) to the hole of Frame Base.
C.B.P-TITE SCREW 3x10 F/ZN-3C (6 ± 1 kgf·cm)
Step 3
Frame Base
Rib
Main Frame Assy
Before installing the Main Frame Assy, shift the Change Lever back to the rear.
When installing the Main Frame Assy, make sure of the following.
• The Change Lever must not interfere with the Main Frame.
• The above shown ribs and grooves, positioning holes and dowels are correctly aligned.
• The section A of the Main Frame Assy is not deformed.
Tighten the screws in the order indicated in the figure above.
CR Driven Pulley Assy / CR Timing Belt
If the CR Timing Belt has to be replaced, it is necessary to extend the new CR Timing Belt by the tension of the Compression Spring 13.98 in
advance. If the CR Timing Belt is replaced without doing this extension process, misalignment of the belt or print failure may occur. Therefore, make
sure to follow the assembling procedure when installing the CR Timing Belt.
When installing the CR Driven Pulley Assy and CR Timing Belt, follow the procedure below.
1. Install the CR Driven Pulley Assy to the Main Frame.
2. Attach the Compression Spring 13.98 in the order from the dowel on the CR Driven Pulley Assy to the rib on the Main Frame.
3. Attach the CR Timing Belt to the CR Driven Pulley Assy.
4. Attach the CR Timing Belt on the pinion gear of the CR Motor while pushing the CR Driven Pulley Assy to the 0-digit side.
5. Wait five minutes for CR Timing Belt to be extended by the tension of the Compression Spring 13.98.
6. Secure the CR Driven Pulley Assy wit the screw.
PF Encoder Sensor / PF Scale
Disassembly/Reassembly Detailed Disassembly/Reassembly Procedure for each Part/Unit 36
Do not reuse the removed PF Scale and make sure to replace it with a new one when removing it.
When installing the PF Scale, it is pressed into the PF Roller, therefore, the removed one is deformed. If it is re-installed to the printer, it does not
rotate properly and the paper feed accuracy may be reduced.
The PF Encoder Sensor cable which connects the PF Encoder Sensor and the Main Board cannot be removed solely because it is soldered on them. If
the PF Encoder Sensor should be removed, make sure to remove it together with the Main Board.
When installing the PF Scale to the PF Roller, press the PF Scale into the PF Roller vertically.
After installing the PF Encoder Sensor, confirm the PF Scale does not touch the PF Encoder Sensor.
When installing the Pump Unit, follow the procedure below in order to prevent ink suction failure.
1. Route the Pump Tube A through the hole of the Frame Base.
2. Install the Pump Unit to the Frame Base, and route the Pump Tube A through the ribs of the Frame Base with their dashed line facing upward.
3. Secure the Pump Unit to the Frame Base with the screw (x1).
4. Route the Pump Tube B through the ribs of the Pump Unit and Frame Base, and insert it to the hole of the Frame Base up to the marking
± 1 mm from tube end).
(8
Pump Unit
Confidential
Page 37
L120 Revision A
C.B.P-TITE SCREW 2x8 F/ZN-3C (2 ± 0.5 kgf·cm)
OK
No gap
NG
Gap exists.
Right side
CR Encoder Sensor
Ink Supply Tank Upper Housing
Back side
Hook
Cap Tank
Ink Tank Label
Ink Supply Tank Upper Housing
Standard line
2 ± 1 mm
20 ± 1 mm
Refilling Ink Label
Ink Supply Tank
Ink Supply Tank
Film
Bottom
Hook
Dowels Section A
RibPositioning holes
Ink Supply Tank Tube
Ink Supply Tank
Ink Supply
Tank Tube
0.5 mm or less
Ink Supply Tank Lower HousingInk Supply Tank Tube
Align the tips of Ink Supply
Tank Tube Assy here.
Align the marking with the edge of
Ink Supply Tank Lower Housing.
CR Encoder Sensor
Ink Supply Tank Upper Housing
Ink Tank Label
Refilling Ink Label
Install the CR Encoder Sensor to the CR Unit without any gap in
between.
Ink Supply Tank
After removing the Ink Supply Tank Upper Housing, make sure to
reattach the Cap Tank on the Ink Supply Tank.
When removing the Ink Supply Tank Upper Housing, disengage
the hooks (x 3) shown above.
Apply the Ink Tank Label while aligning it with the standard line on
the Ink Supply Tank Upper Housing as shown above.
Ink Supply Tank Tube Assy
Attach the Refilling Ink Label according to the standard shown in the
figure above.
Be careful not to damage or peel off the film of the Ink Supply Tank.
Be careful about how to place the Ink Supply Tank in order to prevent printing failure from occurring.
"2.1.5Checks and Precautions before Disassembling (p23)".)
(See
Before removing the Ink Supply Tank, release the hook on the Ink Supply Tank Lower Housing, and disengage Section A of the Ink Supply Tank
from the rib on the Ink Supply Tank Lower Housing.
When installing the Ink Supply Tank, align the dowels (x 2) on the bottom with the positioning holes (x 2) on the Ink Supply Tank Lower Housing.
Route the Ink Supply Tank Tube Assy on the Ink Supply Tank Lower Housing as shown above.
When connecting the Ink Supply Tank Tube Assy to the Ink Supply Tank, take care not to connect them to the wrong tanks.
When connecting the Ink Supply Tank Tube Assy to the Ink Supply Tank, insert the tubes to the full and make sure the gaps between the end of
tubes and the tank are 0.5 mm long or less.
Disassembly/Reassembly Detailed Disassembly/Reassembly Procedure for each Part/Unit 37
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Page 38
L120 Revision A
290 ± 1 mm
160 ± 1 mm
Black
Magenta
Yellow
Cyan
Joint side
Adapter side
Ink Supply Tube Assy: Step 1
2nd marking
1st marking
Tube clamp
CR Unit
Joint
OK
Ink Supply
Tube
Section A
Hole
Tube Guide
Sheet Sub
Adapter
Ink Supply Tube
Align 1st markings
with edge of grooves.
CR Unit
Grooves
Step 6
NG
Ink Supply
Tube
Section A
Hole
Tube Guide
Sheet Sub
Tube Pressing Plate
Ink Supply Tube
Step 2, 4
Step 3
C.B.P-TITE SCREW 2.6x5 F/ZN-3C (2.55 ± 0.05 kg·fcm)
Joint
Rib
Ink Supply Tube
Ink Supply Tube Guide 2nd
0.5 mm or less
Ink Supply Tube
Ink Supply Tank Tube
Joint
0.5 mm or less
Joint
Cutout
Hole 2
Section A
Hole 1
Tube Guide Sheet
Tube Guide Sheet Sub
OK
Cross Section
NG
Hole 2
Tube Guide Sheet Sub
Tube Guide Sheet
Tube Guide Sheet
Hole 1
Tube Guide Sheet
Ink Supply Tube Guide 2nd
Ink Supply Tube Assy
Joint
When attaching the Joint, align the cutout of the Joint with the rib of the Ink Supply Tube Guide 2nd.
Make sure the gaps between the end of Ink Supply Tank Tubes or Ink Supply Tubes and the Joint are 0.5 mm long or less.
Tube Guide Sheet / Tube Guide Sheet Sub
Follow the procedure below when installing the Ink Supply Tube Assy.
Disassembly/Reassembly Detailed Disassembly/Reassembly Procedure for each Part/Unit 38
1. Mark the two points on the Ink Supply Tube Assy as shown above, and put the tube clamp while aligning it with the second marking.
2. Connect the Ink Supply Tube to the Joint. (p 38)
3. Place the Ink Supply Tube Assy on the Tube Guide Sheet, and engage the both ends of the Tube Guide Sheet Sub by inserting one end (Section
A) into the hole of the other end from above.
4. Attach the Tube Pressing Plate on the Star Wheel Holder Assy, and secure it with the screw (x 1).
5. Connect the Ink Supply Tube to the Adapter, and install the Adapter to the CR Unit. (p 39)
6. Route the Ink Supply Tubes through the grooves of the CR Unit, and align the 1st markings on the Ink Supply Tubes with the edge of the grooves
as shown in the figure above.
Refer the figure above and follow the procedure below when attaching the Tube Guide Sheet Sub to the Tube Guide Sheet.
1. Insert the section A of the Tube Guide Sheet Sub into the hole 1 of the Tube Guide Sheet from the bottom.
2. Insert the section A of the Tube Guide Sheet Sub into the hole 2 of the Tube Guide Sheet from the top.
When attaching the Tube Guide Sheet to the Ink Supply Tube Guide 2nd, while keeping the Tube Guide Sheet Sub attached on the Tube Guide
Sheet, align the holes of the Tube Guide Sheet with the protrusions of the Ink Supply Tube Guide 2nd.
Confidential
Page 39
L120 Revision A
Adapter
Film
Hook
Connection of Ink Supply Tubes
Hook
Ink Supply Tube
Transistor Cover back side
Dowel
Transistor Cover
Adapter
Transistor Cover
Be careful not to damage or peel off the film of the Adapter.
Use a precision screwdriver when releasing the hooks of the
Adapter.
When removing the Transistor Cover, release the dowels (x 2) on
the Transistor Cover and slide it upward.
Disassembly/Reassembly Detailed Disassembly/Reassembly Procedure for each Part/Unit 39
Confidential
Page 40
L120 Revision A
CN12CN102Head FFC
CR Encoder FFC
CN6
CR Motor cable
Right side
PF Encoder cablePS Unit cable
PF Motor cable CN13 CN501Main Board
Aligning Head FFC with CR Encoder FFC
Head FFC
CR Encoder FFC
Stack the Head FFC over the CR Encoder
FFC to keep the Head FFC on top.
Fold here inside FFC Holder
Rear
FFC Holder
Main Frame
FFC Holder
Head FFC/CR Encoder FFC
Head FFC/CR Encoder FFC
Inside of CR Unit
CR Unit
Connector of Printhead
Head FFC
Outside of CR Unit
CR Encoder FFC
Rib
Connector of
CR Encoder
Rearside of CR Unit
CR Encoder FFC
Protrusion
Hole
Rib
PS Unit cable
Bottom of Frame Base
PS Unit cable
Ferrite core
Frame Base
Bottom of Frame Base
PF Motor cable
PF Motor
Route PF Motor
cable through rib.
Secure PF Motor
cable (black) with rib.
Hole
Rib
Frame Base
2.4 Routing FFCs/cables
Main Board Assy
Head FFC (Routing on the Main Frame)
Connect the following cables/FFCs to the Main Board as shown in the figure above.
• PF Motor cable (CN13) • PS Unit cable (CN501)
• CR Motor cable (CN12) • CR Encoder FFC (CN6)
• Head FFC (CN102)
Head FFC (Routing on the CR Unit)
Align the Head FFC and CR Encoder FFC, and then route them through the FFC Holder as shown in the figure above.
PS Unit
PF Motor
Route the CR Encoder FFC through the rib on the CR Unit and connect it to the connector on the CR Encoder.
Make sure that the CR Encoder FFC is not in contact with the protrusion on the CR Unit.
When routing the Head FFC/CR Encoder FFC, engage the fold to the hook on the CR Unit while aligning their shapes, then connect them to the connector on the Printhead.
Pull out the PS Unit cable from the hole of the Frame Base first, and then
route it through the rib of the Frame Base.
Put the ferrite core into the position shown in the figure above.
Route the PF Motor cable as follows.
1. Pull out the PF Motor cable from the hole of the Frame Base.
2. Install the PF Motor, and secure the PF Motor cable (black) with the rib of
the Frame Base, and then route it through the rib of the Frame Base.
Disassembly/Reassembly Routing FFCs/cables 40
Confidential
Page 41
L120 Revision A
CR MotorHook C Hook EGroove of FFC HolderCR Motor cable Hook D
Rib A
CR Motor cable (black)
CR Motor cable (red)
Rib B
Dowel of FFC Holder:
Route above dowel.
CR Motor cable
Do not apply too
much tension.
CR Motor
When routing the CR Motor cable through hooks C, D, E on the Main Frame, make sure to align the portions protected with acetate tape to hooks C, D, E.
Route the CR Motor cable as follows.
1. Route the CR Motor cable (black) around the rib A of the Frame Base (two turns). Do not apply too much tension on the CR Motor cable (black) then.
2. Route the CR Motor cable (red) through the rib B of the Frame Base, and then route it through the rib A taking care not to let the CR Motor cable (red)
come over the CR Motor cable (black).
3. Twist the CR Motor cable (black) and CR Motor cable (red) twice, and then route them through the hook C of the Main Frame.
4. Route the CR Motor cable (black) and CR Motor cable (red) in the order of hook D of the Main Frame, groove of the FFC Holder, dowel of the FFC
Holder, and hook E of the Main Frame.
Disassembly/Reassembly Routing FFCs/cables 41
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Page 42
CHAPTER 3
ADJUSTMENT
Confidential
Page 43
L120
3.1 Required Adjustments
The table from the following page lists the required adjustments depending upon the parts being repaired or
replaced. Find the part(s) you removed or replaced, and check which adjustment(s) must be carried out.
If the EEPROM data cannot be read out from the old Main Board using the Adjustment
Program when replacing the Main Board is required, the Waste Ink Pad Assy must be
replaced with the Main Board at the same time.
After all required adjustments are completed, use the “Final check pattern print”
function to print all adjustment patterns for final check. If you find a problem with the
printout patterns, carry out the adjustment again.
When replacing the Main Board, the adjustment should be made after performing the
initial setting.
The table items and marks used in the “Required Adjustment List” provided on the
following pages have the following meanings.
• “O” indicates that the adjustment must be carried out.
• “---” indicates that the adjustment is not required.
• The “Mechanism Adjustment” should be performed just after reinstalling or
reassembling the part or unit.
• The “Adjustments using the Adjustment Program” need to be performed after
reassembling the printer completely.
If you have removed or replaced multiple parts, make sure to check the required
adjustments for the all parts. And when multiple adjustments must be carried out, be
sure to carry out them in the order given in the “Priority” row.
Revision A
Adjustment Required Adjustments 43
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L120 Revision A
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Table 3-1. Required Adjustment List
Adjustment Type Mechanism adjustment Adjustment using the Adjustment Program
Priority 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Initialize Setting
(Including the MAC
address setting)
To write saledestination-specific
settings and the serial
number into the Main
Board after replacing
it. And also to set the
MAC address as
necessary.
Ink charge Head ID input
To fill ink inside the
new Printhead to
make it ready for
print after replacing
the Printhead.
To correct
characteristic
variation of the
replaced Printhead
by entering its
Printhead ID (Head
ID).
Maintenance
counter
To reset the waste
ink counter after
replacing the Waste
Ink Pad Assy.
PF/EJ adjustment Bi-D adjustment
To correct variations
in paper feed
accuracy to achieve
higher print quality.
To correct print start
timing in
bidirectional
printing through
software control.
Head angular
adjustment
To correct tilt of the
Printhead caused at
the installation
through software
control.
First dot position
adjustment
To correct the print
start position in the
CR Unit moving
direction through
software control.
TOP margin
adjustment
This corrects top
margin of printout.
PF deterioration
offset
To reset the counter
or set it to its
maximum according
to the replaced parts.
CR motor heat
protection control
To measure and
correct the electrical
variation of the
motor and the power
supply board.
PF motor heat
protection control
To measure and
correct the electrical
variation of the
motor and the power
supply board.
Adjustment Item
Purpose
Waste Ink
Pad Assy
Retard
Roller Assy
PS Unit
Paper Guide
Upper Assy
Part Name
PF Roller
Unit
PF Motor
Assy
CR Timing
Belt
Remove
Replace
Remove
Replace
Remove
Replace
Remove
Replace
Remove
Replace
Remove
Replace
Remove
Replace
Checking the
Platen Gap
Check if the PG is
within the standard.
CR/PF Belt
tension check
Check the tension of
the CR Timing Belt
and PF Timing Belt.
EEPROM
data copy
To copy adjustment
values or the like
stored on the old
Main Board to the
new board when the
Main Board needs to
be replaced.
--- --- --- --- --- --- --- --- --- --- --- --- --- --- ---
--- --- --- --- --- --- O --- --- --- --- --- --- --- ---
--- --- --- --- --- --- --- --- --- --- --- --- --- --- ---
--- --- --- --- --- --- --- --- --- --- --- O --- --- ---
--- --- --- --- --- --- --- --- --- --- --- --- --- --- ---
--- --- --- --- --- --- --- --- --- --- --- --- --- O O
--- --- --- --- --- --- --- --- --- --- --- --- --- --- ---
--- --- --- --- --- --- --- O O --- --- O --- --- ---
--- O --- --- --- --- --- --- --- --- --- --- --- --- ---
--- O --- --- --- --- --- O O --- O O --- --- ---
--- O --- --- --- --- --- --- --- --- --- --- --- --- ---
--- O --- --- --- --- --- O --- --- --- O O --- O
--- O --- --- --- --- --- --- --- --- --- --- --- --- ---
--- O --- --- --- --- --- --- --- --- --- --- --- --- ---
Printout pattern
How to judge
Adjustment program
Tool
Note "*1": Necessary when the part is replaced at a point in the disassembly procedures other than specified in this manual.
"*2": Replacement of Waste Ink Pad Assy is necessary.
--- --- --- --- --- --- --- --- --- ---
See " 3.3.1 Checking
the Platen Gap
(p48)" for the
details.
See " 3.3.2 CR/PF
Belt Tension Check
(p50)" for the
details.
--- --- --- --- ---
------ OOOOOOOOOOOOO
See p48
See p50
--- --- --- --- --- --- --- --- --- --- --- --- ---
Normal area
pattern
Examine the
printout patterns
and enter the value
for the pattern
with fewest lines.
Bottom area
pattern
Examine the
printout patterns
and enter the value
for the pattern
with no overlap
and gap between
the two rectangles.
"*3": Perform PF Belt tension check only.
"*4": Perform CR Belt tension check only.
OK
NG
NG
OK NGNG
OK
NG
NG
Examine the
printout patterns for
each of the four
modes, and enter the
value for the pattern
with no gap and
overlap for each
mode.
OK
NG
Enter the values of
the most straight
lines.
Examine the
misaligned lines
printed on the left
side of the paper,
and enter the
number beside the
line that is exactly 5
mm away from the
paper edge.
Examine the
misaligned lines
printed on top of the
paper, and enter the
number beside the
line that is exactly 5
mm away from the
paper edge.
---
See " 3.2.2.1 CR
Motor Heat
Protection Control /
PF Motor Heat
Protection Control
(p47)" for the
details.
See " 3.2.2.1 CR
Motor Heat
Protection Control /
PF Motor Heat
Protection Control
(p47)" for the
details.
Adjustment Required Adjustments 44
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Page 45
L120 Revision A
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-1
0
1
2
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Table 3-1. Required Adjustment List
Adjustment Type Mechanism adjustment Adjustment using the Adjustment Program
Priority 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Initialize Setting
(Including the MAC
address setting)
To write saledestination-specific
settings and the serial
number into the Main
Board after replacing
it. And also to set the
MAC address as
necessary.
Ink charge Head ID input
To fill ink inside the
new Printhead to
make it ready for
print after replacing
the Printhead.
To correct
characteristic
variation of the
replaced Printhead
by entering its
Printhead ID (Head
ID).
Maintenance
counter
To reset the waste
ink counter after
replacing the Waste
Ink Pad Assy.
PF/EJ adjustment Bi-D adjustment
To correct variations
in paper feed
accuracy to achieve
higher print quality.
To correct print start
timing in
bidirectional
printing through
software control.
Head angular
adjustment
To correct tilt of the
Printhead caused at
the installation
through software
control.
First dot position
adjustment
To correct the print
start position in the
CR Unit moving
direction through
software control.
TOP margin
adjustment
This corrects top
margin of printout.
PF deterioration
offset
To reset the counter
or set it to its
maximum according
to the replaced parts.
CR motor heat
protection control
To measure and
correct the electrical
variation of the
motor and the power
supply board.
PF motor heat
protection control
To measure and
correct the electrical
variation of the
motor and the power
supply board.
Adjustment Item
Purpose
Hopper
CR Motor
LD Roller
Assy
PE Sensor
Lever
Part Name
Main Board
Printhead
Remove
Replace
Remove
Replace
Remove
Replace
Remove
Replace
Remove
Replace
(Read OK)
Replace
(Read NG)
Remove
Replace
Checking the
Platen Gap
Check if the PG is
within the standard.
CR/PF Belt
tension check
Check the tension of
the CR Timing Belt
and PF Timing Belt.
EEPROM
data copy
To copy adjustment
values or the like
stored on the old
Main Board to the
new board when the
Main Board needs to
be replaced.
--- --- --- --- --- --- --- --- --- --- --- --- --- --- ---
--- --- --- --- --- --- --- --- O --- O O --- --- ---
--- --- --- --- --- --- --- --- --- --- --- --- --- --- ---
--- --- --- --- --- --- --- --- --- --- --- --- --- O ---
--- --- --- --- --- --- --- --- --- --- --- --- --- --- ---
--- --- --- --- --- --- --- --- --- --- --- O --- --- ---
--- --- --- --- --- --- --- --- --- --- --- --- --- --- ---
--- --- --- --- --- --- --- --- --- --- --- O --- --- ---
--- --- --- --- --- --- --- --- --- --- --- --- --- --- ---
--- --- O --- --- --- --- --- --- --- --- --- --- --- ---
------ ---O---OOOOOOOOOO
--- --- --- --- --- --- --- --- --- --- --- --- --- --- ---
O --- --- --- O O --- --- O O O O --- --- ---
Printout pattern
How to judge
Adjustment program
Tool
Note "*1": Necessary when the part is replaced at a point in the disassembly procedures other than specified in this manual.
"*2": Replacement of Waste Ink Pad Assy is necessary.
--- --- --- --- --- --- --- --- --- ---
See " 3.3.1 Checking
the Platen Gap
(p48)" for the
details.
See " 3.3.2 CR/PF
Belt Tension Check
(p50)" for the
details.
--- --- --- --- ---
------ OOOOOOOOOOOOO
See p48
See p50
--- --- --- --- --- --- --- --- --- --- --- --- ---
Normal area
pattern
Examine the
printout patterns
and enter the value
for the pattern
with fewest lines.
Bottom area
pattern
Examine the
printout patterns
and enter the value
for the pattern
with no overlap
and gap between
the two rectangles.
"*3": Perform PF Belt tension check only.
"*4": Perform CR Belt tension check only.
OK
NG
NG
OK NGNG
OK
NG
NG
Examine the
printout patterns for
each of the four
modes, and enter the
value for the pattern
with no gap and
overlap for each
mode.
OK
NG
Enter the values of
the most straight
lines.
Examine the
misaligned lines
printed on the left
side of the paper,
and enter the
number beside the
line that is exactly 5
mm away from the
paper edge.
Examine the
misaligned lines
printed on top of the
paper, and enter the
number beside the
line that is exactly 5
mm away from the
paper edge.
---
See " 3.2.2.1 CR
Motor Heat
Protection Control /
PF Motor Heat
Protection Control
(p47)" for the
details.
See " 3.2.2.1 CR
Motor Heat
Protection Control /
PF Motor Heat
Protection Control
(p47)" for the
details.
Adjustment Required Adjustments 45
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L120 Revision A
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-1
0
1
2
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Table 3-1. Required Adjustment List
Adjustment Type Mechanism adjustment Adjustment using the Adjustment Program
Priority 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Initialize Setting
(Including the MAC
address setting)
To write saledestination-specific
settings and the serial
number into the Main
Board after replacing
it. And also to set the
MAC address as
necessary.
Ink charge Head ID input
To fill ink inside the
new Printhead to
make it ready for
print after replacing
the Printhead.
To correct
characteristic
variation of the
replaced Printhead
by entering its
Printhead ID (Head
ID).
Maintenance
counter
To reset the waste
ink counter after
replacing the Waste
Ink Pad Assy.
PF/EJ adjustment Bi-D adjustment
To correct variations
in paper feed
accuracy to achieve
higher print quality.
To correct print start
timing in
bidirectional
printing through
software control.
Head angular
adjustment
To correct tilt of the
Printhead caused at
the installation
through software
control.
First dot position
adjustment
To correct the print
start position in the
CR Unit moving
direction through
software control.
TOP margin
adjustment
This corrects top
margin of printout.
PF deterioration
offset
To reset the counter
or set it to its
maximum according
to the replaced parts.
CR motor heat
protection control
To measure and
correct the electrical
variation of the
motor and the power
supply board.
PF motor heat
protection control
To measure and
correct the electrical
variation of the
motor and the power
supply board.
Adjustment Item
Purpose
Star Wheel
Holder Assy
EJ Roller
PF Driven
Pulley Assy
Part Name
PF Timing
Belt
CR Driven
Pulley Assy
Remove
Replace
Remove
Replace
Remove
Replace
Remove
Replace
Remove
Replace
Checking the
Platen Gap
Check if the PG is
within the standard.
CR/PF Belt
tension check
Check the tension of
the CR Timing Belt
and PF Timing Belt.
EEPROM
data copy
To copy adjustment
values or the like
stored on the old
Main Board to the
new board when the
Main Board needs to
be replaced.
--- --- --- --- --- --- --- --- --- --- --- --- --- --- ---
--- --- --- --- --- --- --- O --- --- --- --- --- --- ---
--- --- --- --- --- --- --- --- --- --- --- --- --- --- ---
--- --- --- --- --- --- --- O --- --- --- --- --- --- ---
--- O --- --- --- --- --- --- --- --- --- --- --- --- ---
--- O --- --- --- --- --- --- --- --- --- --- --- --- ---
--- O --- --- --- --- --- --- --- --- --- --- --- --- ---
--- O --- --- --- --- --- --- --- --- --- --- --- --- ---
--- O --- --- --- --- --- --- --- --- --- --- --- --- ---
--- O --- --- --- --- --- --- --- --- --- --- --- --- ---
Printout pattern
How to judge
Adjustment program
Tool
Note "*1": Necessary when the part is replaced at a point in the disassembly procedures other than specified in this manual.
"*2": Replacement of Waste Ink Pad Assy is necessary.
--- --- --- --- --- --- --- --- --- ---
See " 3.3.1 Checking
the Platen Gap
(p48)" for the
details.
See " 3.3.2 CR/PF
Belt Tension Check
(p50)" for the
details.
--- --- --- --- ---
------ OOOOOOOOOOOOO
See p48
See p50
--- --- --- --- --- --- --- --- --- --- --- --- ---
Normal area
pattern
Examine the
printout patterns
and enter the value
for the pattern
with fewest lines.
Bottom area
pattern
Examine the
printout patterns
and enter the value
for the pattern
with no overlap
and gap between
the two rectangles.
"*3": Perform PF Belt tension check only.
"*4": Perform CR Belt tension check only.
OK
NG
NG
OK NGNG
OK
NG
NG
Examine the
printout patterns for
each of the four
modes, and enter the
value for the pattern
with no gap and
overlap for each
mode.
OK
NG
Enter the values of
the most straight
lines.
Examine the
misaligned lines
printed on the left
side of the paper,
and enter the
number beside the
line that is exactly 5
mm away from the
paper edge.
Examine the
misaligned lines
printed on top of the
paper, and enter the
number beside the
line that is exactly 5
mm away from the
paper edge.
---
See " 3.2.2.1 CR
Motor Heat
Protection Control /
PF Motor Heat
Protection Control
(p47)" for the
details.
See " 3.2.2.1 CR
Motor Heat
Protection Control /
PF Motor Heat
Protection Control
(p47)" for the
details.
Adjustment Required Adjustments 46
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Page 47
L120
Execute button
Check the check box of the replaced parts.
Execute button
Check the check box of the replaced parts.
3.2 Adjustment Program
This section provides the operating environment, functions related to safety and privacy policy, and the
adjustment item newly added of the Adjustment Program. See "3.1 Required Adjustments (p43)" for the
adjustments not explained here.
3.2.1 Operating Environment
The operating environment for the Adjustment Program is as follows.
OS: Windows XP, Vista, 7, 8
Interface: USB
3.2.2 Details of the Adjustment Program
Refer to the guide in the Adjustment Program for the details of the procedure.
3.2.2.1 CR Motor Heat Protection Control / PF Motor Heat Protection Control
Revision A
Purpose To measure the manufacturing variations of the DC motors (CR Motor/PF Motor), Main Board and Power
Supply Board to determine the correction value used for estimating the current values of the motors.
Risks if the
adjustment is not
correctly made
Procedure 1. Select from the menu of the Adjustment Program. Check the check box of the replaced parts and press the
Adjustment
Program screen
The printer cannot measure the current value of motor correctly, then the heat generation caused by motor
drive cannot be estimated accurately either, and which may results in trouble such as incorrect control of
motors when allotting a cool down period according to each heat generation.
In the worst case, excessive heat generation may cause smoke or ignition.
“Execute” button to measure the correction value.
2. The correction value is automatically measured and the measurement value is written to the EEPROM on
the Main Board.
Remarks ---
Adjustment Adjustment Program 47
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Page 48
L120
3.3 Mechanism Adjustment / Check
This section provides the procedure for the mechanism adjustment and check.
3.3.1 Checking the Platen Gap
This section describes the procedure for checking the platen gap (PG).
This printer does not have any PG adjustment mechanism, however, it is designed so that the
platen gap can fall within the expected range if you correctly reassemble the unit (including
using the Epson-specified jigs) according to this manual. If the PG cannot fall within the
standard range after performing the platen gap check described in this section, first check if
the unit is correctly reassembled following the instructions in this manual. Even if the unit is
correctly reassembled but the PG still cannot fall within the standard range, replace the unit
with a new/refurbished one.
The standard range of the PG is as follows:
• Standard: 1.95 ± 0.45 mm
Tools
Thickness gauge: 1.5 mm (x2), 2.0 mm (x2)
Confirmation procedure
Revision A
When checking the PG, make sure of the following.
Check the PG with new ink cartridges installed to the CR Unit, and also with all parts
related to the PG installed to the printer (p 43).
Move the CR Unit by pulling the CR Timing Belt.
Be careful not to damage the nozzles of the Printhead with the thickness gauge.
Adjustment Mechanism Adjustment / Check 48
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L120
80-digit side
A
B
0-digit side
A
B
1. Move the CR Unit to the center of the printer.
2. Place the thickness gauges (1.5 mm) on the position A shown in Figure 3-1.
Figure 3-1. Position of the Thickness Gauge
3. Pull the CR Timing Belt to move the CR Unit to both ends and confirm the CR Unit does not touch the
thickness gauges.
*1
4. Move the CR Unit to the center, and place the thickness gauges (1.5 mm) on the position B shown in Figure
3-1.
5. Pull the CR Timing Belt to move the CR Unit to both ends and confirm the CR Unit does not touch the
thickness gauges.
*1
6. Move the CR Unit to the center, and place the thickness gauges (2.0 mm) on the position A shown in Figure
3-1.
Revision A
7. Pull the CR Timing Belt to move the CR Unit to both ends and confirm the CR Unit touches the thickness
gauges.
*2
8. Move the CR Unit to the center, and place the thickness gauges (2.0 mm) on the position B shown in Figure
3-1.
9. Pull the CR Timing Belt to move the CR Unit to both ends and confirm the CR Unit touches the thickness
gauges.
Note "*1": If the CR Unit comes in contact with the thickness gauges, the PG is smaller than the standard value, therefore, check if the
"*2": If the CR Unit does not come in contact with the thickness gauges, the PG is greater than the standard value, therefore, check
*2
unit is correctly reassembled. If not, reassemble the unit and perform PG check again. (If the unit is correctly reassembled,
replace the unit with a new/refurbished one.)
if the unit is correctly reassembled. If not, reassemble the unit and perform PG check again. (If the unit is correctly
reassembled, replace the unit with a new/refurbished one.)
Adjustment Mechanism Adjustment / Check 49
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Page 50
L120
CR Timing Belt Measurement position CR Unit
3.3.2 CR/PF Belt Tension Check
This section describes the CR/PF Belt tension check.
This printer is designed so that the each tension of the CR Timing Belt and PF Timing
Belt fall within the expected range if you correctly reassemble the unit according to this
manual. However, deformation of any related part(s) can cause improper tension of the
belt. In such case, replace the unit with a new/refurbished one.
The standard tension range is as follows:
• CR Timing Belt: 6.225 ± 1.555 N
• PF Timing Belt: 5.3 ± 2.7 N
Tools
Sonic tension meter
Plastic tweezers
Confirmation procedure
When performing the CR/PF Belt tension check, make sure of the following.
Bring the microphone of the sonic tension meter within 5 mm from the timing belt but do
not let it touch the belt.
Flip the timing belt as weak as the sonic tension meter can measure it.
Be careful not to damage the timing belt when flipping it with the plastic tweezers.
Revision A
Checking the CR Timing Belt Tension
Perform the CR Belt tension check after performing " 3.3.1 Checking the Platen Gap (p48)".
1. Move the CR Unit to 0-digit side.
2. Set the following parameters to the sonic tension meter:
Weight: 0.9 g/m
Width: 3.0 mm
Span: 326 mm
3. Bring the microphone of the sonic tension meter close to the position shown in Figure 3-2.
4. Press the “MEASURE” button of the sonic tension meter and flip the upper of the CR Timing Belt with
plastic tweezers and measure the tension of the belt three times.
5. Check the average of the measured values falls within the standard range.
Within the standard range: the CR Timing Belt tension check is complete.
Out of the standard range: replace the unit with a new/refurbished one.
Figure 3-2. Checking the CR Timing Belt Tension
Adjustment Mechanism Adjustment / Check 50
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L120
PF Driven Pulley Assy PF Timing Belt
Left side
Measurement position
Checking the PF Timing Belt Tension
Perform the PF Belt tension check before installing the PF Scale and the PF Encoder Sensor.
1. Set the following parameters to the sonic tension meter:
Weight: 1.1 g/m
Width: 2.5 mm
Span: 29 mm
2. Bring the microphone of the sonic tension meter close to the position shown in Figure 3-3.
3. Press the “MEASURE” button of the sonic tension meter and flip the lower of the PF Timing Belt with
plastic tweezers and measure the tension of the belt three times.
4. Check the average of the measured values falls within the standard range.
Within the standard range: the PF Timing Belt tension check is complete.
Out of the standard range: reinstall the " PF Driven Pulley Assy / PF Timing Belt (p35) " , and then perform the PF
Timing Belt Tension Check again.
Revision A
Figure 3-3. Checking the PF Timing Belt Tension
If not within the standard though performing the PF Timing Belt Tension Check twice,
replace the unit with a new/refurbished one.
Adjustment Mechanism Adjustment / Check 51
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Page 52
CHAPTER 4
MAINTENANCE
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Page 53
L120
4.1 Overview
This section provides information to maintain the printer in its optimum condition.
4.1.1 Cleaning
Except for the Printhead, there are no other mechanical parts or units that require periodic cleaning. However, if
need arises, clean the component observing the following instructions.
Instructions for cleaning
Exterior parts such as housing
Wipe dirt off with a soft clean cloth moistened with water. For glossy or transparent parts, use of unwoven cloth is
recommended to avoid scratching those parts.
Inside of the printer
Remove paper dust with a vacuum cleaner.
Rubber or plastic rollers such as an LD roller used to feed paper
If paper dust adhered to the rollers decreases the frictional force of the rollers and the rollers cannot properly feed
paper, wipe off the paper dust with a soft cloth moistened with diluted alcohol.
Instructions for cleaning ink stains
Wipe the stains off with a cloth wrung out of diluted alcohol.
Revision A
Do not use alcohol for cleaning the transparent parts. Doing so may cause them to get
cloudy.
When wiping paper dust off the LD Roller, be careful not to rub against the surface
asperity.
To minimize the effect on the parts, use diluted alcohol such as 70% diluted ether.
After using alcohol for cleaning, make sure to wipe the part off with a soft dry dust-free
cloth to remove alcohol traces fully.
4.1.2 Lubrication
The type and amount of the grease used to lubricate the printer parts are determined based on the results of the
internal evaluations. Therefore, refer to "4.2 Lubrication Points and Instructions (p54)" for the repairing
procedures below, and apply the specified type and amount of the grease to the specified part of the printer
mechanism.
"4.2 Lubrication Points and Instructions (p54)" also provides information about whether or not the parts which
require lubrication are supplied as ASP and the lubrication status when supplied as ASP. For the parts which are
not supplied as ASP, if their movement is not smooth enough, check their lubrication status and lubricate them if
necessary.
Grease
Type Name EPSON Part Code Supplier
Grease G-45 1033657 EPSON
Grease G-71 1304682 EPSON
Grease G-74 1409257 EPSON
Tools
Name Availability EPSON Part Code
Injector O * ---
Brush O * ---
Flux dispenser O * 1049533
Note *: Use tools whose specifications are specified in "4.2 Lubrication Points and Instructions (p54)".
Maintenance Overview 53
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L120 Revision A
Frame Base
Application Point
Frame Base
Apply grease on sides.
Application Point
Application Point
Frame Base
Left
Right
Frame Base
Application Point B
Application Point A
Application Point C
4.2 Lubrication Points and Instructions
<Part supply as ASP>
None
<Lubrication status when
supplied as ASP>
---
<Lubrication Point>
Ribs (x12) and hooks (x6)
on the Frame Base
(Contact points of the EJ
Roller)
<Type>
G-74
<Application Amount>
Appropriate amount
<Remarks>
Apply with flux
dispenser.
Stir G-74 before use.
<Part supply as ASP>
None
<Lubrication status when
supplied as ASP>
---
<Lubrication Point>
Contact points (x2) on the
Frame Base with the
Hopper
<Type>
G-71
<Application Amount>
Appropriate amount
<Remarks>
Apply with injector, then
spread with brush.
Figure 4-1. Lubrication of the Frame Base (1)
<Part supply as ASP>
None
<Lubrication status when
supplied as ASP>
---
<Lubrication Point>
Contact points (x15 on the
ribs) on the Frame Base
with the Hopper
<Type>
G-74
<Application Amount>
Appropriate amount
<Remarks>
Apply with flux
dispenser.
Stir G-74 before use.
Figure 4-2. Lubrication of the Frame Base (2)
<Part supply as ASP>
None
<Lubrication status when
supplied as ASP>
---
<Lubrication Point>
Bearings (x3; A to C) of
the PF Roller Unit on the
Frame Base
<Type>
G-71
<Application Amount>
Appropriate amount
<Remarks>
Apply with injector.
Lubricate according to
the standards below.
A.
Lubricate three times along
the grooves.
B.
Lubricate along the groove.
C.
Do the same as A, then
spread over entire bearing
with brush.
After installing PF
Roller Unit, wipe off
excess grease.
Figure 4-3. Lubrication of the Frame Base (3)
Maintenance Lubrication Points and Instructions 54
Figure 4-4. Lubrication of the Frame Base (4)
Confidential
Page 55
L120 Revision A
LD Roller Assy
2. Application Point
1. Application Point
EJ Roller
Application Point
Frame Base
EJ Roller Gear
Application Point
Paper Back Lever
Application Point
CR Driven Pulley Holder
2. Application Point
1. Application Point
2. Application Point
1. Application Point
CR Driven Pulley
CR Driven Pulley Shaft
Main Frame Assy
CR Unit
Application Point
Main Frame Assy
Frame Base
<Part supply as ASP>
Yes
<Lubrication status when
supplied as ASP>
Not lubricated
<Lubrication Point>
1. Cam of the LD Roller
Assy (contact point with
the Hopper)
2. Cam of the LD Roller
Assy (contact point with
the Paper Back Lever)
<Type>
G-71
<Application Amount>
Circumference of each
cam (0.05 g each)
<Remarks>
Apply with injector.
Lubricate before
attaching the part.
<Part supply as ASP>
Yes
<Lubrication status when
supplied as ASP>
Not lubricated
<Lubrication Point>
Contact point (x1 on the
shaft) on the EJ Roller with
the Frame Base
<Type>
G-71
<Application Amount>
0.06 g
<Remarks>
Apply with injector.
Lubricate before
attaching the part.
<Part supply as ASP>
Yes
<Lubrication status when
supplied as ASP>
Not lubricated
<Lubrication Point>
Shaft on the EJ Roller Gear
<Type>
G-71
<Application Amount>
1 mm x 1 circle
<Remarks>
Using injector, apply
grease along the tier on
the shaft.
Lubricate before
attaching the part.
<Part supply as ASP>
Yes
<Lubrication status when
supplied as ASP>
Not lubricated
<Lubrication Point>
Contact points (x2) on the
Paper Back Lever with the
Frame Base
<Type>
G-71
<Application Amount>
0.06 g x 2 points
<Remarks>
Apply with injector.
Lubricate before
attaching the part.
Figure 4-5. Lubrication of the LD Roller Assy Figure 4-6. Lubrication of the EJ Roller
<Part supply as ASP>
None
<Lubrication status when
supplied as ASP>
---
<Lubrication Point>
1.
On the bearings (x2) of the
CR Driven Pulley on the
CR Driven Pulley Holder
2. Contact points (x6) on
the groove of the CR
Driven Pulley Holder
with the Main Frame
<Type>
G-71
<Application Amount>
Appropriate amount
<Remarks>
Apply with injector.
Check the lubrication
condition and apply
grease if necessary.
<Part supply as ASP>
None
<Lubrication status when
supplied as ASP>
---
<Lubrication Point>
1.
Shaft hole of the Driven
Pulley.
2. CR Driven Pulley Shaft
<Type>
G-71
<Application Amount>
Appropriate amount
<Remarks>
Apply with injector.
Figure 4-7. Lubrication of the EJ Roller Gear Figure 4-8. Lubrication of the Paper Back Lever
<Part supply as ASP>
None
<Lubrication status when
supplied as ASP>
---
<Lubrication Point>
1. Contact point (x1) on
the upper side of the
Main Frame Assy with
the CR Unit
2. Contact points (x4) on
the lower side of the
Main Frame Assy with
the CR Unit
<Type>
G-71
<Application Amount>
Appropriate amount
<Remarks>
Apply with injector.
Figure 4-9. Lubrication of the CR Driven Pulley Assy Figure 4-10. Lubrication of the CR Driven Pulley/
Maintenance Lubrication Points and Instructions 55
Figure 4-11. Lubrication of the Main Frame Assy
CR Driven Pulley Shaft
Confidential
Page 56
CHAPTER 5
APPENDIX
Confidential
Page 57
L120
Cap
5.1 Connector Diagram
Cable connections of this printer are shown below.
CR Unit
Revision A
Printhead
CN102
CR Motor PF Motor
CR Encoder
CN1
CN6
PE Sensor
CN3
USB
Figure 5-1. Connector Diagram
Main Board
CN501 CN7CN13CN12
PS Board
AC in
PF Encoder
5.2 Points to be checked before packing the printer
All the caps of the Ink Supply Tank Assy are securely
closed.
The opened ink bottle is not included in the box.
Appendix Connector Diagram 57
Confidential
Page 58
L120
Housing Upper Assy
Standard line
Strong tape
Inside of Housing Upper Assy
Change Lever CR Unit
Strong tape Folded ends
5.3 Protection for Transportation
This section describes the cautions for packing the printer before returning it to the user.
5.3.1 Securing the CR Unit
Purpose
To prevent damaging the Change Lever by shock during transportation.
Risks if it is not performed
Fatal error caused by the damage of the Change Lever.
Preparation
Prepare a piece of strong tape (length: 135 mm, width: 14 mm, fold one end 5 mm).
Method
1. Turn off the printer to set the CR Unit to its home position.
2. Pull the CR Timing Belt, and move the CR Unit to the 80-digit side slightly so that the CR Unit can touch
the side of the tip on the Change Lever.
3. Attach the unfolded portion of the strong tape on the CR Unit as shown below.
4. Apply the folded portion of the strong tape on the Housing Upper Assy to finish securing the CR Unit.
Revision A
In order to prevent damaging the Change Lever, the CR Unit should be secured at the
position indicated in Step 3. Therefore, when securing the CR Unit with strong tape, hold the
Timing Belt to keep the position of the CR Unit as is and avoid the CR Unit from moving to
the 0-digit side.
Figure 5-2. Securing the CR Unit
Appendix Protection for Transportation 58
Confidential
Page 59
L120
Folded ends
Housing Upper Assy
Printer Cover
Strong tape
5.3.2 Securing the Printer Cover
Purpose
To prevent damaging the Printer Cover by the shock during transportation.
Risks if it is not performed
The Printer Cover will be scratched and the abrasion powder will be produced due to the shock during
transportation.
Preparation
Prepare two pieces of strong tape (length: 115 mm, width: 14 mm, fold one end 5 mm).
Method
Apply strong tape on the Printer Cover and Housing Upper Assy to secure the Printer Cover.
Revision A
Figure 5-3. Securing the Printer Cover
Appendix Protection for Transportation 59
Confidential
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