Service manual

CHAPTER 6 TROUBLESHOOTING
6-26
M-9 Fixing Unit failure
Possible cause Step Check Result Remedy
Poor thermistor
harness contact
1 Is the contact of connector
CN7 on the engine PCB good?
No Reconnect the connector.
Blown thermal
fuse
2 Remove the fixing unit and
measure the resistance
between the input connectors.
Is it open circuit?
Yes Replace the fixing unit.
Thermistor
failure
3 Is the thermistor installed
properly?
Yes Replace the fixing unit.
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.
• If the heater is cooled down sufficiently, this problem may be cleared by enter the
maintenance mode after press 9 key twice. Be warned, however, that this operation
will melt the fixing unit if the heater is hot.
M-10 Main PCB failure
Possible cause Step Check Result Remedy
Main PCB 1 Is it possible to copy? 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,
machine condition and
system environment.