Sharp MX-4100N Service Manual page 309

L4-45 Toner cooling fan trouble
(Toner cooling fan 1, 2)
Trouble content
Detail PCU
Cause When the toner cooling fan is operated, the fan
operation signal is not detected within the specified
time.
Toner cooling fan trouble.
PCU PWB trouble.
Connection trouble of the connector and the
harness.
Check & Remedy After turning ON the power, check to confirm that the
fan is rotating.
Replace the toner cooling fan.
Replace the PCU PWB.
Check connection of the connector and the harness.
L4-50 Process fan trouble
Trouble content
Detail PCU
Cause The fan operation signal is not detected within the
specified time in the process fan operation.
Process fan trouble.
PCU PWB trouble
Connection trouble of the connector and the
harness.
Check & Remedy Check that the fan is rotating after turning ON the
power.
Replace the process fan.
Replace the PCU PWB.
Check connection of the connector and the harness.
L4-56 Rear cooling fan trouble
Trouble content
Detail PCU
Cause The fan operation signal is not detected within the
specified time in the rear cooling fan operation.
Rear cooling fan trouble.
PCU PWB trouble.
Connection trouble of the connector and the
harness.
Check & Remedy Check that the fan is rotating after turning ON the
power.
Replace the rear cooling fan.
Replace the PCU PWB.
Check connection of the connector and the harness.
L4-57 Toner cooling fan trouble
(Toner cooling fan 3)
Trouble content
Detail PCU
Cause When the toner cooling fan is operated, the fan
operation signal is not detected within the specified
time.
Toner cooling fan trouble.
PCU PWB trouble.
Connection trouble of the connector and the
harness.
Check & Remedy After turning ON the power, check to confirm that the
fan is rotating.
Replace the toner cooling fan.
Replace the PCU PWB.
Check connection of the connector and the harness.
MX-5001N SELF DIAG AND TROUBLE CODE 7 – 23
L4-58 Ozone exhaust fan trouble
Trouble content
Detail PCU
Cause The fan operation signal is not detected within the
specified time in the ozone exhaust fan operation.
Ozone exhaust fan trouble.
PCU PWB trouble.
Connection trouble of the connector and the
harness.
Check & Remedy Check that the fan is rotating after turning ON the
power.
Replace the ozone exhaust fan.
Replace the PCU PWB.
Check connection of the connector and the harness.
L6-10 Polygon motor trouble
Trouble content
Detail PCU
Cause The motor does not reach the specified rpm in 7 sec
after starting rotation of the polygon motor.
Polygon motor trouble.
LSU control PWB trouble.
Connection trouble of the connector and the
harness.
Check & Remedy Use SIM61-1 to check the operation of the polygon
motor.
Check connection of the connector and the harness.
Replace the polygon motor.
Replace the LSU.
Replace the LSU control PWB.
L8-01 Full wave signal detection error
Trouble content
Detail PCU
Cause No full wave signal is detected.
PCU PWB trouble
Power unit trouble.
Connection trouble of the connector and the
harness.
Check & Remedy Replace the PCU PWB.
Replace the power unit.
Check connection of the connector and the harness.
L8-02 Full wave signal error
Trouble content
Detail PCU
Cause An abnormality in the full wave signal frequency is
detected.
(The frequency is detected as 65Hz or above, or
45Hz or less.)PCU PWB trouble.
Power unit trouble.
Connection trouble of the connector and the
harness.
Power frequency, waveform abnormality.
Check & Remedy Replace the PCU PWB.
Replace the power unit.
Check connection of the connector and the harness.
Check the power waveform.