MX-6201N, MX-7001N (serv.man20). SELF DIAGNOSIS TROUBLE CODES SECTION - Sharp Copying Equipment Service Manual (repair manual). Page 25

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MX-7001N  SELF DIAG AND TROUBLE CODE  8 – 25
 
H3-05
Fusing external thermistor high 
temperature trouble (TH_EX2)
 
H4-00
Fusing section low temperature 
trouble (TH_UM_AD2)
 
H4-01
Fusing section low temperature 
trouble (TH_LM)
 
H4-02
Sub thermistor fusing section low
temperature trouble (TH_US)
 
H4-04
External heating thermistor fusing 
section low temperature trouble 
(TH_EX1)
 
H4-30
Detection thermistor input 
abnormality (TH_UM)
Trouble content
It is detected that the fusing temperature exceeds 
the specified temperature.
Section
PCU
Case 1
Cause
Fusing section connector and harness connection 
trouble
Check and 
remedy
Check the harness and the connector from the 
thermistor to the PCU PWB.
Use SIM14 to cancel the trouble.
Case 2
Cause
Thermistor trouble, PCU PWB trouble
Check and 
remedy
Replace the thermistor or the PCU PWB.
Use SIM14 to cancel the trouble.
Trouble content
The temperature does not reach the specified level 
within the specified time after turning on the power 
relay.
Section
PCU
Case 1
Cause
Thermistor trouble, heater lamp trouble, PCU PWB 
trouble, thermostat trouble, AC power source 
trouble, interlock switch trouble
Check and 
remedy
1)
Use SIM5-2 to check blinking of the heater 
lamp.
2)
If it blinks normally, check the thermistor and 
the harness.
Check the PCU PWB thermistor input circuit 
section.
3)
If it is not lighted, check for the heater lamp 
disconnection and the thermostat breakage. 
Check the interlock switch. Check the AC 
PWB and the PCU PWB lamp control circuit.
4)
Use SIM14 to cancel the trouble.
Trouble content
The temperature does not reach the specified level 
within the specified time after turning on the power 
relay.
Section
PCU
Case 1
Cause
Thermistor trouble, heater lamp trouble, PCU PWB 
trouble, thermostat trouble, AC power source 
trouble, interlock switch trouble
Check and 
remedy
1)
Use SIM5-2 to check blinking of the heater 
lamp.
2)
If it blinks normally, check the thermistor and 
the harness.
Check the PCU PWB thermistor input circuit 
section.
3)
If it is not lighted, check for the heater lamp 
disconnection and the thermostat breakage. 
Check the interlock switch. Check the AC 
PWB and the PCU PWB lamp control circuit.
4)
Use SIM14 to cancel the trouble.
Trouble content
The temperature does not reach the specified level 
within the specified time after turning on the power 
relay.
Section
PCU
Case 1
Cause
Thermistor trouble, heater lamp trouble, PCU PWB 
trouble, thermostat trouble, AC power source 
trouble, interlock switch trouble
Check and 
remedy
1)
Use SIM5-2 to check blinking of the heater 
lamp.
2)
If it blinks normally, check the thermistor and 
the harness.
Check the PCU PWB thermistor input circuit 
section.
3)
If it is not lighted, check for the heater lamp 
disconnection and the thermostat breakage. 
Check the interlock switch. Check the AC 
PWB and the PCU PWB lamp control circuit.
4)
Use SIM14 to cancel the trouble.
Trouble content
When the power relay is turned ON after supplying 
power, the set temperature is not reached within 
the specified time. 
Section
PCU
Case 1
Cause
Thermistor trouble, heater lamp trouble, PCU PWB 
trouble, thermostat trouble, AC power source 
trouble, interlock switch trouble
Check and 
remedy
1)
Use SIM5-2 to check blinking of the heater 
lamp.
2)
If it blinks normally, check the thermistor and 
the harness.
Check the PCU PWB thermistor input circuit 
section.
3)
If it is not lighted, check for the heater lamp 
disconnection and the thermostat breakage. 
Check the interlock switch. Check the AC 
PWB and the PCU PWB lamp control circuit.
4)
Use SIM14 to cancel the trouble.
Trouble content
TH_UM_AD1 and TH_UM_AD2 do not exceed the 
specified level (50 count with the AD value) within 
5 minutes after HL_UM is turned on.
Section
PCU
Case 1
Cause
HL_UM does not turn on. Thermistor trouble, 
harness trouble, PCU PWB trouble
Check and 
remedy
1)
Use SIM5-2 to check blinking of the heater 
lamp.
2)
If it blinks normally, check the thermistor and 
the harness.
Check the PCU PWB thermistor input circuit 
section.
3)
If it is not lighted, check for the heater lamp 
disconnection and the thermostat breakage. 
Check the interlock switch. Check the AC 
PWB and the PCU PWB lamp control circuit.
4)
Use SIM14 to cancel the trouble.
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