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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.
Summary of Contents for DCP 8040 - B/W Laser - All-in-One
Page 272: ...CHAPTER 7 MAINTENANCE MODE 7 6 Fig 7 3 l m a b c d e f g h i j k ...
Page 343: ...APPENDIX 4 CIRCUIT DIAGRAMS A 50 Appendix 4 1 Main PCB Circuit Diagram 1 7 ...
Page 345: ...APPENDIX 4 CIRCUIT DIAGRAMS A 52 Appendix 4 3 Main PCB Circuit Diagram 3 7 ...
Page 347: ...APPENDIX 4 CIRCUIT DIAGRAMS A 54 Appendix 4 5 Main PCB Circuit Diagram 5 7 ...
Page 349: ...APPENDIX 4 CIRCUIT DIAGRAMS A 56 Appendix 4 7 Main PCB Circuit Diagram 7 7 ...
Page 351: ...APPENDIX 4 CIRCUIT DIAGRAMS A 58 Appendix 4 9 Engine PCB Circuit Diagram 1 2 ...
Page 353: ...APPENDIX 4 CIRCUIT DIAGRAMS A 60 Appendix 4 11 NCU PCB Circuit Diagram U S A ...
Page 355: ...APPENDIX 4 CIRCUIT DIAGRAMS A 62 Appendix 4 13 NCU PCB Circuit Diagram Asia ...
Page 357: ...APPENDIX 4 CIRCUIT DIAGRAMS A 64 Appendix 4 15 Control Panel PCB Circuit Diagram ...
Page 362: ...April 04 SM FAX027 1 8C5903 Printed in Japan ...