Brother HL 5030 - B/W Laser Printer Service Manual page 202

CHAPTER 6 TROUBLESHOOTING
M-9 Fixing Unit failure
Possible cause
Poor thermistor
harness contact
Blown thermal
fuse
Thermistor
failure
Halogen heater
lamp failure
Heater harness
connection
failure
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 turning on the
printer power switch while pressing the Job Cancel button. Be warned, however, that this
operation will melt the fixing unit if the heater is hot.
M-10
Possible cause
Main PCB
Software bug
Step Check
1 Is the contact of connector
CN7 on the engine PCB good?
2 Remove the fixing unit and
measure the resistance
between the input connectors.
Is it open circuit?
3 Is the thermistor installed
properly?
4 Remove the fixing unit and
measure the resistance of the
halogen heater lamp. Is it
open circuit?
5 Is the heater harness
connector connected to the
low-voltage power supply PCB
and fixing unit secure?
Main PCB failure
Step Check
1 Is it possible to print the test
page with the method of
'INSPECTION MODE'
Chapter 7?
2 Does this problem appear
when printing specific data or
printing under a specific
environment?
Result
No Reconnect the connector.
Yes Replace the fixing unit.
Yes Replace the fixing unit.
No Reinstall the thermistor
properly.
Yes Replace the halogen heater
lamp.
No Reconnect the connectors
securely.
Result
No Replace the main PCB.
1.3.
in
Yes Inform the Brother office of
the used specific data, printer
condition and system
environment.
6-22
Remedy
Remedy