MX3114N TROUBLESHOOTING 7 – 22
L3-00 Scanner return trouble
L4-02 Paper feed motor trouble
L4-03 Fusing motor trouble
L4-04 Developing motor trouble (BLACK)
L4-05 Developing motor trouble (COLOR)
L4-06 Transfer unit lift trouble
L4-11 Shift motor trouble
Trouble content Scanner return is not completed within the specified
time.
Detail SCU
Cause Scanner unit trouble
SCU PWB trouble
Scanner control PWB trouble
Harness and connector connection trouble
Scanner home position sensor trouble
Scanner motor trouble
Check & Remedy Use SIM1-1 to check the scan operation.
Replace the scanner unit.
Replace the SCU PWB.
Check connection of the connectors and the harness.
Replace the scanner home position sensor.
Replace the scanner motor.
Trouble content A lock signal is not detected within the specified time
in ON operation of the paper feed motor after
warming-up or canceling a jam.
Detail PCU
Cause Paper feed motor trouble
Paper feed motor harness and connector connection
trouble
PCU PWB trouble
Check & Remedy Use SIM6-1 to check the operation of the paper feed
motor.
Replace the paper feed motor.
Check connection of the paper feed motor harness
and the connector.
Replace the PCU PWB.
Trouble content The motor lock signal is detected during rotation of
the fusing motor.
Detail PCU
Cause Fusing motor trouble
Fusing motor harness and connector connection
trouble
PCU PWB trouble
Check & Remedy Use SIM6-1 to check the operation of the fusing
motor.
Replace the Fusing motor.
Check connection of the fusing motor harness and
the connection.
Replace the PCU PWB.
Trouble content The motor lock signal is detected during rotation of
the developing motor.
Detail PCU
Cause Developing motor trouble
Developing motor harness and connector connection
trouble
PCU PWB trouble
Developing unit trouble
Check & Remedy Use SIM25-1 to check the operation of the
developing motor.
Replace the developing motor.
Check connection of the developing motor harness
and the connection.
Replace the PCU PWB.
Replace the developing motor.
Replace the developing unit.
Trouble content The motor lock signal is detected during rotation of
the developing motor.
Detail PCU
Cause Developing motor trouble
Developing motor harness and connector connection
trouble
PCU PWB trouble
Developing unit trouble
Check & Remedy Use SIM25-1 to check the operation of the
developing motor.
Replace the developing motor.
Check connection of the developing motor harness
and the connection.
Replace the PCU PWB.
Replace the developing motor.
Replace the developing unit.
Trouble content A change in the primary transfer position sensor
cannot be detected within the specified time in lifting
operation of the primary transfer unit.
Detail PCU
Cause Transfer unit position sensor trouble
Dirt on the transfer unit position sensor.
PCU PWB trouble
Connection trouble of the connector and the harness.
Transfer unit lift mechanism trouble
Primary transfer belt unit is not installed.
Check & Remedy Use SIM6-3 to check the separating operation of the
transfer unit.
Install the primary transfer belt unit.
Replace the transfer unit position sensor.
Clean the transfer unit position sensor.
Replace the PCU PWB.
Check connection of the connector and the harness.
Repair the transfer unit lift mechanism.
Trouble content No change in the shifter home position sensor signal
is detected in the operation of the shifter initializing.
Detail PCU
Cause Shift motor trouble.
PCU PWB trouble.
Connection trouble of the connector and the harness.
Shifter home position sensor trouble.
Check & Remedy Use SIM6-1 to check the shift operation.
Use SIM30-1 to check the operation of the shifter
home position sensor.
Replace the shift motor.
Replace the PCU PWB.
Check connection of the connector and the harness.
Replace the shifter home position sensor.
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