MX-6201N, MX-7001N (serv.man20). SELF DIAGNOSIS TROUBLE CODES SECTION - Sharp Copying Equipment Service Manual (repair manual). Page 24

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MX-7001N  SELF DIAG AND TROUBLE CODE  8 – 24
 
H2-03
Non-contact thermistor 
compensation thermistor open 
(TH1_AD1)
 
H2-04
External heating thermistor open 
(TH_EX1)
 
H2-05
Fusing external heating thermistor 
open (TH_EX2)
 
H3-00
Fusing section high temperature 
trouble (TH_UM)
 
H3-01
Fusing section high temperature 
trouble (TH_LM)
 
H3-02
Sub thermistor fusing section high
temperature trouble (TH_US)
 
H3-04
External heating thermistor high 
temperature trouble (TH_EX1)
Trouble content
Thermistor open
Section
PCU
Case 1
Cause
Thermistor trouble, control PWB trouble, fusing 
section connector connection trouble, AC power 
source trouble
Check and 
remedy
Check the harness and the connector from the 
thermistor to the control PWB.
Trouble content
Thermistor open
Section
PCU
Case 1
Cause
Thermistor trouble, control PWB trouble, fusing 
section connector connection trouble, AC power 
source trouble
Check and 
remedy
Check the harness and the connector from the 
thermistor to the control PWB.
Trouble content
Thermistor open
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.
Case 2
Cause
Thermistor trouble, PCU PWB trouble
Check and 
remedy
Replace the thermistor or the PCU PWB.
Trouble content
The fusing temperature inside the PWB exceeds 
the specified level.
Section
PCU
Case 1
Cause
Thermistor trouble, control PWB trouble, fusing 
section connector connection error, AC power 
source 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 control PWB thermistor input 
circuit section.
3)
If the heater lamp keep lighting, check the AC 
PWB and the control PWB lamp control 
circuit.
4)
Use SIM14 to cancel the trouble.
Trouble content
The fusing temperature inside the PWB exceeds 
the specified level.
Section
PCU
Case 1
Cause
Thermistor trouble, control PWB trouble, fusing 
section connector connection error, AC power 
source 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 control PWB thermistor input 
circuit section.
3)
If the heater lamp keep lighting, check the AC 
PWB and the control PWB lamp control 
circuit.
4)
Use SIM14 to cancel the trouble.
Trouble content
The fusing temperature inside the PWB exceeds 
the specified level.
Section
PCU
Case 1
Cause
Thermistor trouble, control PWB trouble, fusing 
section connector connection error, AC power 
source 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 control PWB thermistor input 
circuit section.
3)
If the heater lamp keep lighting, check the AC 
PWB and the control PWB lamp control 
circuit.
4)
Use SIM14 to cancel the trouble.
Trouble content
The external heating thermistor temperature 
exceeds the specified temperature.
Section
PCU
Case 1
Cause
Thermistor trouble, control PWB trouble, fusing 
section connector connection error, AC power 
source trouble
Check and 
remedy
1)
Use Sim44-14 to check if the thermistor 
(TH_EX1) shows an abnormal temperature. If 
the display is normal, use Sim5-2 to check 
the blinking operation of the heater lamp.
a)
If it blinks normally, check the thermistor 
and the harness.
Check the control PWB thermistor input 
circuit section.
b)
If the heater lamp keep lighting, check 
the AC PWB and the control PWB lamp 
control circuit.
2)
Use SIM14 to cancel the trouble.
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