MX-1800N (serv.man16). Section 8 - Self Diagnostics Trouble Codes - Sharp Copying Equipment Service Manual (repair manual). Page 20

MX-1800N  SELF DIAG AND TROUBLE CODE  8 – 20

 

 

 

 

 

 

 

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 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 control 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 control 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 control 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 
1minute 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.

Trouble content

5 continuous detection of POD1 not-reached jam

Section

PCU

Case 1

Cause

The fusing jam is not removed completely. (Jam 
paper remains.)

Check and 
remedy

Check the fusing section for jam paper. (winding, 
etc.)

Case 2

Cause

POD1 sensor trouble or harness connection 
trouble

Check and 
remedy

Check the POD1 sensor harness. Use SIM14 to 
cancel the trouble.

Case 3

Cause

Fusing unit installation trouble

Check and 
remedy

Check the fusing unit installation.

Trouble content

Mirror feed is not completed within the specified 
time.

Section

Scanner

Case 1

Cause

Mirror unit trouble, mirror wire disengagement

Check and 
remedy

Use SIM1-1 to check the mirror operation.