Read Sharp MX-6240N / MX-7040N (serv.man26) Service Manual online
MX-7040N TROUBLESHOOTING 7 – 38
H4-00
Fusing section low temperature
trouble (TH_UM_AD2)
H4-01
Fusing section low temperature
trouble (TH_LM)
H4-02
Fusing section low temperature
trouble (TH_US)
H4-30
Upper main thermistor differential
input abnormality (TH_UM)
Trouble content
The fusing temperature does not reach the specified
level within the specified time from turning ON the
power relay.
level within the specified time from turning ON the
power relay.
Detail
PCU
Cause
Thermistor trouble.
Heater lamp trouble.
PCU PWB trouble.
Thermostat trouble.
Connector, harness connection trouble.
HL control PWB trouble.
Power unit trouble.
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.
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.
level within the specified time from turning ON the
power relay.
Detail
PCU
Cause
Thermistor trouble.
Heater lamp trouble.
PCU PWB trouble.
Thermostat trouble.
Connector, harness connection trouble.
HL control PWB trouble.
Power unit trouble.
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.
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.
level within the specified time from turning ON the
power relay.
Detail
PCU
Cause
Thermistor trouble.
Heater lamp trouble.
PCU PWB trouble.
Thermostat trouble.
Connector, harness connection trouble.
HL control PWB trouble.
Power unit trouble.
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 SIM05-02 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.
Use SIM44-14 to check the state of the thermistor.
Use SIM05-02 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 values of TH_UM_AD1 and TH_UM_AD2 do not
exceed the specified value within the specified time
from turning ON the HL_UM.
exceed the specified value within the specified time
from turning ON the HL_UM.
Detail
PCU
Cause
HL_UM does not turn on.
Thermistor trouble.
Harness trouble.
PCU PWB trouble
Thermistor trouble.
Harness trouble.
PCU PWB trouble
Check & Remedy
Use SIM05-02 to check the flashing operation of the
heater lamp.
When the heater lamp flashes normally, check the
thermistor and its harness.
Check the thermistor input circuit section of the PCU
PWB.
When the lamp does not light up, check for
disconnection in the heater lamp and breakage of
the thermostat.
Check the interlock switch.
Check the lamp control circuit of the AC PWB and
the PCU PWB.
Use SIM14 to cancel the trouble.
heater lamp.
When the heater lamp flashes normally, check the
thermistor and its harness.
Check the thermistor input circuit section of the PCU
PWB.
When the lamp does not light up, check for
disconnection in the heater lamp and breakage of
the thermostat.
Check the interlock switch.
Check the lamp control circuit of the AC PWB and
the PCU PWB.
Use SIM14 to cancel the trouble.
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