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E7-10
Shading error (Black correction)
Trouble content
Detail
SCU
Cause
Abnormality in the CCD black scan level when the
scanner lamp is turned OFF.
Improper installation of the harness to the CCD unit.
CCD unit abnormality.
SCU PWB abnormality.
Check & Remedy
Check connection of the harness to the CCD unit.
Check the CCD unit.
Check the SCU PWB.
E7-11
Shading error (White correction)
Trouble content
Detail
SCU
Cause
Abnormality in the CCD white reference plate scan
level when the scanner lamp is turned ON.
Improper installation of the harness to the CCD unit.
Dirt on the mirror, lens, and the reference white plate.
Scanner lamp lighting trouble.
Scanner lamp drive PWB trouble
CCD unit abnormality.
SCU PWB abnormality.
Check & Remedy
Check connection of the harness to the CCD unit.
Check connection of the harness to the scanner lamp
unit.
Check or replace the scanner lamp.
Check or replace the scanner lamp drive PWB.
Clean or replace the mirror, the lens, and the
reference white board.
Check or replace the CCD unit.
Check or replace the SCU PWB.
E7-14
CCD-ASIC error
Trouble content
Detail
SCU
Cause
SCU PWB trouble.
Improper Installation of the harness to the CCD unit.
CCD unit abnormality.
SCU PWB abnormality.
Check & Remedy
Check the SCU PWB.
Replace the SCU PWB.
Check connection of the harness to the CCD unit.
Check or replace the CCD unit.
Check or replace the SCU PWB.
E7-20
LSU laser detection error
Trouble content
Detail
PCU
Cause
Laser optical axis misalignment
Reduced laser power, lighting error, laser diode
trouble.
Disconnection or improper connection of harness and
connector between LD PWB and MFPC PWB.
Check & Remedy
Use SIM61-1 to check the operation of the LSU.
Check connection of the connector and harness
between the LD PWB and the MFPC PWB.
Replace the MFPC PWB.
Replace the LSU.
E7-21
Trouble content
Check & Remedy
E7-28
Trouble content
Check & Remedy
E7-49
Trouble content
Check & Remedy
E7-50
Trouble content
Check & Remedy
E7-55
Trouble content
Check & Remedy
MX-M316N TROUBLESHOOTING 7 – 8
LSU LD deterioration trouble
Laser trouble
Detail
PCU
Cause
Laser deterioration, power reduction
Disconnection or improper connection of harness and
connector between LD PWB and MFPC PWB.
Use SIM61-1 to check the operation of the LSU.
Check connection of the communication connetctor
between the LD PWB and MFPC PWB.
Replace the MFPC PWB.
Replace the LSU.
LSU control Asic connection error
Access error between the CPU in the PCU PWB and
the LSU control ASIC.
Detail
PCU
Cause
Improper connection of the communication connector
between the PCU PWB and the MFPC PWB.
Harness trouble between the PCU PWB and the
MFPC PWB
PCU PWB or MFPC PWB trouble.
Check connection of the connector and the harness
between the PCU PWB and the MFPC PWB.
Replace the MFPC PWB.
Replace the PCU PWB.
Water Mark data error
Detail
MFP
Cause
Watermark data trouble.
HDD trouble.
* When the wartermark data is not installed, U2-60
error occurs in booting.
Use SIM62-02/SIM62-03 to check HDD read/write.
If the result is NG, a remedy corresponding to E7-03
is required.
Use SIM49-05 to update the watermark data.
(Reinstallation)
PCU connection trouble
Unknown PWB identification information is detected
in the PCU PWB.
Detail
PCU
Cause
A PWB/firmware which does not comply with the
machine specifications is connected.
Check the kind and the version of the firmware.
LSU connection trouble.
PCU PWB trouble.
LSU trouble.
PCU PWB information sum error
PCU EEPROM PWB information sum error
Detail
PCU
Cause
PCU EEPROM sum check error.
PCU EEPROM trouble.
PCU EEPROM contact trouble.
Replace the PCU PWB.
Replace the PCU EEPROM.
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