Sharp MX-4100N Service Manual page 307

H7-14 Recovery error from low fuser temp.
(TH_EX)
Trouble content
Detail PCU
Cause The specified temperature is not reached within the
specified time from job stop due to a fall in the fusing
temperature.
Thermistor trouble.
Thermostat trouble.
Heater lamp trouble.
PCU PWB trouble.
Power unit trouble.
Interlock switch trouble.
Connection trouble of the connector and the
harness.
Check & Remedy Replace the thermistor.
Replace the thermostat.
Replace the heater lamp.
Replace the PCU PWB.
Replace the power unit.
Replace the interlock switch.
Check connection of the connector and the harness.
Use SIM5-2 to check the flashing operation of the
heater lamp.
L1-00 Scanner feed trouble
Trouble content
Detail SCU
Cause Scanner feed is not completed within the specified
time.
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.
L3-00 Scanner return trouble
Trouble content
Detail SCU
Cause Scanner return is not completed within the specified
time.
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.
MX-5001N SELF DIAG AND TROUBLE CODE 7 – 21
L4-02 Paper feed motor trouble
Trouble content
Detail PCU
Cause The lock signal Is not detected within 1 sec when
turning ON the paper feed motor when warming up,
canceling a jam.
Paper feed motor trouble.
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 connectors and the
harness.
Replace the PCU PWB.
L4-03 Fusing motor trouble
Trouble content
Detail PCU
Cause The motor lock signal is detected during rotation of
the fusing motor.
Fusing motor trouble.
Connection trouble of the connector and the
harness.
PCU PWB trouble.
Check & Remedy Use SIM6-1 to check the operation of the fusing
motor.
Replace the Fusing motor.
Check connection of the connectors and the
harness.
Replace the PCU PWB.
L4-04 Developing motor trouble (BLACK)
Trouble content
Detail PCU
Cause The motor lock signal is detected during rotation of
the developing motor.
Developing motor trouble.
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 connectors and the
harness.
Replace the PCU PWB.
Replace the developing motor.
Replace the developing unit.
L4-05 Developing motor trouble (COLOR)
Trouble content
Detail PCU
Cause The motor lock signal is detected during rotation of
the developing motor.
Developing motor trouble.
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 connectors and the
harness.
Replace the PCU PWB.
Replace the developing motor.
Replace the developing unit.