MX-5001N SELF DIAG AND TROUBLE CODE 7 – 20
H4-30 Thermistor input circuit trouble
(TH_UM)
H5-01 5 times continuous POD1 not-reach
jam
H7-10 Recovery error from low fuser temp.
(TH_UM_AD2)
H7-11 Recovery error from low fuser temp.
(TH_LM)
H7-12 Recovery error from low fuser temp.
(TH_US)
Trouble content
Detail PCU
Cause The values of TH_UM_AD1 and TH_UM_AD2 do not
exceed the specified value (50 counts in AD value)
within the specified time from turning ON the
HL_UM.
Thermistor trouble.
Heater lamp trouble.
PCU PWB trouble
Thermostat trouble.
Connector, harness connection trouble.
Power unit trouble.
Interlock switch trouble
Check & Remedy Replace the thermistor.
Replace the heater lamp.
Replace the PCU PWB.
Replace the thermostat.
Check connection of the connector and the harness.
Replace the power unit.
Replace the interlock switch.
Use SIM5-2 to check the flashing operation of the
heater lamp.
Use SIM14 to cancel the trouble.
Trouble content
Detail PCU
Cause A fusing jam is not canceled completely. (A jam
paper remains.)
POD1 sensor trouble.
Fusing unit installation trouble.
Connector, harness connection trouble.
PCU PWB trouble
Check & Remedy Replace the POD1 sensor.
Check the installing position of the fusing unit.
Replace the fusing unit.
Check connection of the connector and the harness.
Replace the PCU PWB.
Use SIM14 to cancel the trouble.
Trouble content
Detail PCU
Cause The fusing temperature does not reach the specified
level within the specified time from stopping a job
due to fall in the fusing temperature.
Thermistor trouble.
Heater lamp trouble.
PCU PWB trouble
Thermostat trouble.
Connector, harness connection trouble.
Power unit trouble.
Interlock switch trouble.
Check & Remedy Replace the thermistor.
Replace the heater lamp.
Replace the PCU PWB.
Replace the thermostat.
Check connection of the connector and the harness.
Replace the power unit.
Replace the interlock switch.
Use SIM5-2 to check the flashing operation of the
heater lamp.
Trouble content
Detail PCU
Cause The fusing temperature does not reach the specified
level within the specified time from stopping a job
due to fall in the fusing temperature.
Thermistor trouble.
Heater lamp trouble.
PCU PWB trouble
Thermostat trouble.
Connector, harness connection trouble.
Power unit trouble.
Interlock switch trouble.
Check & Remedy Replace the thermistor.
Replace the heater lamp.
Replace the PCU PWB.
Replace the thermostat.
Check connection of the connector and the harness.
Replace the power unit.
Replace the interlock switch.
Use SIM5-2 to check the flashing operation of the
heater lamp.
Trouble content
Detail PCU
Cause The fusing temperature does not reach the specified
level within the specified time from stopping a job
due to fall in the fusing temperature.
Thermistor trouble.
Heater lamp trouble.
PCU PWB trouble
Thermostat trouble.
Connector, harness connection trouble.
Power unit trouble.
Interlock switch trouble.
Check & Remedy Replace the thermistor.
Replace the heater lamp.
Replace the PCU PWB.
Replace the thermostat.
Check connection of the connector and the harness.
Replace the power unit.
Replace the interlock switch.
Use SIM5-2 to check the flashing operation of the
heater lamp.
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