MX-M316N TROUBLESHOOTING 7 – 14
H4-00 Fusing section low temperature
trouble (TH_UM)
H4-01 Fusing section low temperature
trouble (TH_US)
H5-01 5-time continuous jams of POSD
L1-00 Scanner feed trouble
L3-00 Scanner return trouble
Trouble content The fusing temperature does not reach the specified
level within the specified time from turning ON the
power relay.
Detail PCU
Cause Main thermistor trouble.
Main heater lamp trouble.
PCU PWB trouble.
Thermostat trouble.
Connector, harness connection trouble.
HL control PWB trouble.
Power unit trouble.
Check & Remedy Use SIM14 to cancel the trouble.
Use SIM44-14 to check the state of the thermistor.
Use SIM5-2 to check the flashing operation of the
heater lamp.
Replace the thermistor.
Replace the heater lamp.
Replace the PCU PWB.
Replace the thermostat.
Check connection of the connector and the harness.
Replace the HL control PWB.
Replace the power unit.
Trouble content The fusing temperature does not reach the specified
level within the specified time from turning ON the
power relay.
Detail PCU
Cause Sub thermistor trouble.
Sub heater lamp trouble.
PCU PWB trouble.
Thermostat trouble.
Connector, harness connection trouble.
HL control PWB trouble.
Power unit trouble.
Check & Remedy Use SIM14 to cancel the trouble.
Use SIM44-14 to check the state of the thermistor.
Use SIM5-2 to check the flashing operation of the
heater lamp.
Replace the thermistor.
Replace the heater lamp.
Replace the PCU PWB.
Replace the thermostat.
Check connection of the connector and the harness.
Replace the HL control PWB.
Replace the power unit.
Trouble content
Detail PCU
Cause A fusing jam is not canceled completely. (A jam paper
remains.)
POSD sensor trouble
Fusing unit installation trouble
POSD sensor connector and harness connection
trouble
PCU PWB trouble
Fusing unit, drive section trouble
Check & Remedy Replace the POSD sensor.
Check installation of the fusing unit.
Replace the fusing unit.
Check paper around the fusing unit section.
Check connection of the POSD sensor connector and
the harness.
Replace the PCU PWB.
Use SIM14 to cancel the trouble.
Trouble content Scanner feed 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 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.
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