NOTE: - Page 212

Confidential

9-24

M-8 

Fixing unit failure 

Possible cause 

Step 

Check 

Result

Remedy 

Poor 
thermistor 
harness 
contact 

1 

Is the contact of connector 
CN19 on the main PCB 
good? 

No 

Reconnect the connector. 

Blown thermal 
fuse 

2 

Remove the fixing unit and 
measure the resistance 
between the thermostat.  Is 
it open circuit? 

Yes  Replace the fixing unit. 

Yes  Replace the fixing unit. 

Thermistor 
assembling 
failure 

3 

Is the thermistor installed 
properly? 

No 

Reinstall the thermistor 
properly. 

Halogen 
heater lamp 
failure 

4 

Remove the fixing unit and 
measure the resistance of 
the halogen heater lamp.  Is 
it open circuit? 

Yes  Replace the halogen heater 

lamp. 

Heater harness 
connection 
failure 

5 

Is the heater harness 
connector connected to the 
low-voltage power supply 
PCB and fixing unit 
secure? 

No 

Reconnect the connectors 
securely. 

NOTE: 

• 

This problem will be cleared if leaving the printer power ON for ten minutes.

M-9 

Main PCB failure 

Possible cause 

Step 

Check 

Result

Remedy 

Main PCB 

1 

Is it possible to print the 
test page with the method? 

No 

Replace the main PCB. 

Software bug 

2 

Does this problem appear 
when printing specific data 
or printing under a specific 
environment? 

Yes  Inform the Brother office of the 

used specific data, printer 
condition and system 
environment.