L120 Revision A
Confidential
Troubleshooting Troubleshooting Workflow 10
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.
Fatal error
Please refer to
" 1.3 Fatal Error Code
List (p13)"
.
Maintenance error
[Occurrence Condition]
This error occurs when
maintenance counter in EEPROM
exceeds the specified value.
[Major Occurrence Timing]
• Power-on timing
• Print start timing
• Cleaning timing
[Troubleshooting]
• Porous Pad replacement &
Maintenance counter reset
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.
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
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.
Paper Jam error
[Occurrence Condition]
This error occurs when top/
bottom of paper is not detected by
PE Sensor in the specified steps of
paper 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
Starts paper feeding
operation again if printer has
print data.
•Fail
Occurs paper jam error
again.
2 If fail in the above 1, remove
the paper by opening Printer
Cover.
3 Perform paper eject operation
from operation panel again.
• Success
Starts paper feeding
operation again if printer has
print data.
•Fail
Occurs paper jam error
again.
4 If fail in the above 3, check
foreign material / part come-
off / PE Sensor Lever / PE
Sensor / Main board.
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.
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
No Power
*2
[Presumable Cause]
• PS Unit damage
• Main Board damage
[Major Troubleshooting]
• PS Unit replacement
• Main Board replacement
[Main board replacement]
• EEPROM data copy for old
main board
• EEPROM data initial setting
for new Main board
Poor Printing
[Phenomenon]
• Poor printing quality
• Ink stain on paper
•Dot missing
• Paper eject without printing
[Presumable Cause]
• Driver / Panel mis-setting
• Contamination of CR scale
• Contamination of Printhead
cover
• Printhead damage
• Ink clogging of Printhead
• Contamination on Cap Unit /
Wiper of Ink System Assy
• Ink System Assy damage
• Float of Porous Pad on Paper
Guide Front
• Narrower/Wider PG
(out of standard)
• 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
(Main Board replacement)
• Ink tank 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
Abnormal Noise
[Presumable Cause]
• Foreign material
• Insufficient grease
•Gear damage
[Major Troubleshooting]
• Foreign material removal
• Lubrication of grease
• Gear replacement
Finish
*3
Turn on the power
*1
1
1
Major problem without error message
Print check pattern
Is printing operation
finished without trouble?
Start
No
Yes
No
Yes
No
Yes
*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.
Major problem with error message
Major problem without
error message
Is Power-on sequence
finished without error?
Standby condition
Does printer turn on the
power?
Does an error occur
when printing?
No
Yes
Blank printing
[Phenomenon]
Blank printing
[Presumable Cause]
• Ink tube crumples
• Ink tube connection is
incomplete.
[Major Troubleshooting]
• Ink tank replacement
• Ink tube re-installation
Main board replacement
• EEPROM data copy for old
Main Board Assy
• EEPROM data initial setting
for new Main Board Assy
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Printing
Paper Handling
Electrical Specifications
