Read Sharp MX-6240N / MX-7040N (serv.man26) Service Manual online
MX-7040N TROUBLESHOOTING 7 – 39
H4-31
Lower main thermistor differential
input abnormality (TH_LM1)
H4-32
Upper sub thermistor differential input
abnormality (TH_US1)
H5-01
5 times continuous POD1 not-reach
jam
H7-10
Recovery error from low fuse r temp.
(TH_UM_AD2)
H7-11
Recovery error from low fuse r temp.
(TH_LM)
L1-00
Scanner feed trouble
Trouble content
The lower main compensation thermistor and the
lower main differential thermistor do not exceed the
specified value within the specified time from turning
ON the lower main heater lamp.
lower main differential thermistor do not exceed the
specified value within the specified time from turning
ON the lower main heater lamp.
Detail
PCU
Cause
The lower main heater lamp does not turn ON.
Thermistor breakdown, harness trouble, PCU PWB
trouble
Thermistor breakdown, 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.
Trouble content
The upper sub compensation thermistor and the
upper sub differential thermistor do not exceed the
specified value within the specified time from turning
ON the upper sub heater lamp.
upper sub differential thermistor do not exceed the
specified value within the specified time from turning
ON the upper sub heater lamp.
Detail
PCU
Cause
The upper sub heater lamp does not turn ON.
Thermistor breakdown, harness trouble, PCU PWB
trouble
Thermistor breakdown, 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.
Trouble content
Detail
PCU
Cause
A fusing jam is not canceled completely. (A jam paper
remains.)
POD1 sensor trouble
Fusing unit installation trouble
POD1 sensor connector and harness connection
trouble
PCU PWB trouble
Fusing unit, drive section trouble
remains.)
POD1 sensor trouble
Fusing unit installation trouble
POD1 sensor connector and harness connection
trouble
PCU PWB trouble
Fusing unit, drive section trouble
Check & Remedy
Replace the POD1 sensor.
Check installation of the fusing unit.
Replace the fusing unit.
Check or repair the fusing drive section.
Check connection of the POD1 sensor connector and
the harness.
Replace the PCU PWB.
Use SIM14 to cancel the trouble.
Check installation of the fusing unit.
Replace the fusing unit.
Check or repair the fusing drive section.
Check connection of the POD1 sensor connector and
the harness.
Replace the PCU PWB.
Use SIM14 to cancel the trouble.
Trouble content
The fusing temperature does not reach the specified
level within the specified time from stopping a job due
to fall in the fusing temperature.
level within the specified time from stopping a job due
to fall in the fusing temperature.
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
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 SIM5-2 to check the flashing operation of the
heater lamp.
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 SIM5-2 to check the flashing operation of the
heater lamp.
Trouble content
The fusing temperature does not reach the specified
level within the specified time from stopping a job due
to fall in the fusing temperature.
level within the specified time from stopping a job due
to fall in the fusing temperature.
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
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 SIM5-2 to check the flashing operation of the
heater lamp.
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 SIM5-2 to check the flashing operation of the
heater lamp.
Trouble content
Scanner feed is not completed within the specified
time.
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.
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.
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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