Brother 1240 Service Manual page 144

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
Fixing unit
ground wire
connection
Harness
connection
failure
Engine PCB
Main PCB
M-13 PCI BUS error (HL-1270N only)
Possible cause
Harness
connection
failure
Network board
Main PCB
Step Check
1 Is it possible to print the test
page with the method of
Subsection 10.1 '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 10.1 '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 ground wire on the fixing
unit secured with the shoulder
screw correctly?
2 Is the connection between
connector P6 on the main PCB
and connector P3 on the
engine PCB secure?
3 Is the problem solved by
replacing the engine PCB?
4 Is the problem solved by
replacing the main PCB?
Step Check
1 Is the connection between
connector P21 on the main
PCB and connector P1 on the
network board secure?
2 Is the problem solved by
replacing the network board?
3 Is the problem solved by
replacing the main PCB?
Result
No Replace the main PCB.
Yes Inform the Brother office of the
used specific data, printer
condition and system
environment.
Result
No Replace the main PCB.
Yes Inform the Brother office of the
used specific data, printer
condition and system
environment.
Result
No Secure the ground wire
correctly with the shoulder
screw.
No Reconnect the connectors
securely.
Yes Replace the engine PCB.
Yes Replace the main PCB.
Result
No Reconnect the connectors
securely.
Yes Replace the network board.
Yes Replace the main PCB.
6-22
PR99210
Remedy
Remedy
Remedy
Remedy