Brother HL 1240 - B/W Laser Printer Service Manual page 132

CHAPTER 6 TROUBLESHOOTING
M-10 ROM error / D-RAM error / NV-RAM error
Possible cause
Main PCB
Software bug
M-11 Service A (Address error) / Service B (BUS error) / CPU runtime error
Possible cause
Main PCB
Software bug
M-12 Engine interface error
Possible cause
Harness
connection
failure
Engine PCB
Main PCB
Step Check
1 Is it possible to print the test
page with the method of
Subsection 9.1 'Test Print
Mode' in this chapter?
2 Does this problem appear
when printing specific data or
printing under a specific
environment?
Step Check
1 Is it possible to print the test
page with the method of
Subsection 9.1 'Test Print
Mode' in this chapter?
2 Does this problem appear
when printing specific data or
printing under a specific
environment?
Step Check
1 Is the connection between
connector P6 on the main PCB
and connector P3 on the
engine PCB secure?
2 Is the problem solved by
replacing the engine PCB?
3 Is the problem solved by
replacing the main PCB?
Result
No
Yes
Result
No
Yes
Result
No
Yes
Yes
6-22
Remedy
Replace the main PCB.
Inform the Brother office of the
used specific data, printer
condition and system
environment.
Remedy
Replace the main PCB.
Inform the Brother office of the
used specific data, printer
condition and system
environment.
Remedy
Reconnect the connectors
securely.
Replace the engine PCB.
Replace the main PCB.