MX-M316N TROUBLESHOOTING 7 – 15
L4-01 Main motor lock trouble
L4-11 Shift motor trouble
L4-34 LSU cooling fan trouble
L4-32 Power source cooling fan trouble
L4-35 Fusing cooling fan trouble
L4-40 Ozone fan trouble
L4-43 Paper exit cooling fan trouble
L6-10 Polygon motor trouble
L4-70 Toner motor lock trouble
L8-02 Full wave signal width abnormality
Trouble content The motor lock signal is detected during rotation of
the main motor.
Detail PCU
Cause Main motor lock trouble
Harness and connector connection trouble
PCU PWB trouble
Check & Remedy Use SIM6-1 to check the operation of the main motor
lock.
Replace the main motor.
Check connection of the connectors and the harness.
Replace the PCU PWB.
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.
Trouble content The fan operation signal is not detected.
Detail PCU
Cause LSU cooling fan trouble.
PCU PWB trouble
Connection trouble of the connector and the harness.
Check & Remedy Check connection of the connectors and the harness.
Use SIM6-2 to check the rotating operation of the fan.
Replace the LSU cooling fan.
Replace the PCU PWB.
Trouble content The fan operation signal is not detected.
Detail PCU
Cause Power cooling fan trouble.
PCU PWB trouble.
Connection trouble of the connector and the harness.
Check & Remedy Use SIM6-2 to check that the fan is actually rotating.
Replace the power cooling fan.
Replace the PCU PWB.
Check connection of the connectors and the harness.
Trouble content The fan operation signal is not detected.
Detail PCU
Cause Fusing cooling fan trouble.
PCU PWB trouble.
Connection trouble of the connector and the harness.
Check & Remedy Use SIM6-2 to check that the fan is actually rotating.
Replace the fusing cooling fan.
Replace the PCU PWB.
Check connection of the connector and the harness.
Trouble content The fan operation signal is not detected.
Detail PCU
Cause Harness/connector trouble between the PCU PWB
and the fan motor.
PCU PWB trouble.
Fan motor trouble.
The fan does not rotate because of the other trouble
(No power supply to the fan motor)
Check & Remedy
Use SIM6-2 to check the operation of the fan
motor.
Replace the fan motor / the PCU PWB.
Check connection of the connector and the
harness.
Trouble content The fan operation signal is not detected.
Detail PCU
Cause Paper exit cooling fan trouble.
PCU PWB trouble.
Connection trouble of the connector and the harness.
Check & Remedy Replace the fan.
Replace the PCU PWB.
Check the connector and the harness.
Use SIM6-2 to check that the fan is actually rotating.
Trouble content The polygon motor does not reach the specified RPM
within the specified time after starting rotation of the
polygon motor.
Detail PCU
Cause Polygon motor trouble.
PCU 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 LSU.
Replace the PCU PWB.
Trouble content
Detail PCU
Cause Toner motor abnormality
Improper connection or disconnection of the toner
motor and the harness.
PCU PWB abnormality
Check & Remedy Use SIM 10-1 to check the toner motor operations.
Check connection of the toner motor harness/
connector.
Replace the toner motor. Replace the
PCU PWB.
Trouble content The full wave signal frequency is judged as abnormal.
(The detected frequency is over 65Hz or below
45Hz.)
Detail PCU
Cause PCU PWB trouble.
Power unit trouble.
Harness trouble.
Check & Remedy Replace the PCU PWB.
Replace the power unit.
Check connection of the connector and the harness.
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