Read Sharp MX-6240N / MX-7040N (serv.man26) Service Manual online
MX-7040N TROUBLESHOOTING 7 – 40
L2-11
Lamp cooling fan motor trouble
L3-00
Scanner return trouble
L4-02
Paper feed motor trouble
L4-03
Fusing motor trouble
L4-06
Transfer unit lift trouble
L4-07
Transfer belt motor trouble
L4-08
Waste toner transport motor lock
Trouble content
A lock signal is detected during rotation of the fan.
A non-lock state is detected except when in rotation
for booting.
A non-lock state is detected except when in rotation
for booting.
Detail
SCU
Cause
Fan motor trouble.
Harness related to the fan motor
Circuit trouble
Harness related to the fan motor
Circuit trouble
Check & Remedy
Check the fan motor related circuits (SCN-Mother
PWB, SCNcnt PWB) and their harnesses and
connectors.
PWB, SCNcnt PWB) and their harnesses and
connectors.
Trouble content
Scanner return is not completed within the specified
time.
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
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.
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.
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
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.
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.
fusing motor.
Detail
PCU
Cause
Fusing motor trouble
Fusing motor harness and connector connection
trouble
PCU PWB 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.
motor.
Replace the Fusing motor.
Check connection of the fusing motor harness and the
connection.
Replace the PCU PWB.
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.
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.
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.
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
The motor lock signal is detected during rotation of the
transfer belt motor.
transfer belt motor.
Detail
PCU
Cause
Transfer belt trouble.
Harness/connector trouble between the PCU PWB
and the transfer belt motor.
Control PWB trouble.
Circuit trouble.
Harness/connector trouble between the PCU PWB
and the transfer belt motor.
Control PWB trouble.
Circuit trouble.
Check & Remedy
Use SIM25-1 to check the operation of the transfer
belt motor.
Check the harness and the connector between the
PCU PWB and the transfer belt motor.
belt motor.
Check the harness and the connector between the
PCU PWB and the transfer belt motor.
Trouble content
The waste toner lock sensor is detected during
rotation of the drum motor.
rotation of the drum motor.
Detail
PCU
Cause
Waste toner transport motor trouble.
Waste toner transport pipe clogging
Harness/connector trouble between the PCU PWB
and the waste toner transport motor.
Waste toner transport pipe clogging
Harness/connector trouble between the PCU PWB
and the waste toner transport motor.
Check & Remedy
Use SIM6-1 to check the operation of the waste toner
transport motor (WTM).
Check the waste toner transport pipe for clogging.
Check the harness and the connector between the
PCU PWB and the waste toner transport motor.
transport motor (WTM).
Check the waste toner transport pipe for clogging.
Check the harness and the connector between the
PCU PWB and the waste toner transport motor.
Click on the first or last page to see other MX-6240N / MX-7040N (serv.man26) service manuals if exist.