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CHAPTER 6 TROUBLESHOOTING
6-22
M-10 ROM error / D-RAM error / NV-RAM error
Possible cause Step Check Result Remedy
Main PCB 1 Is it possible to print the test
page with the method of
Subsection 10.1 ‘Test Print
Mode’ in this chapter?
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, printer
condition and system
environment.
M-11 Service A (Address error) / Service B (BUS error) / CPU runtime error
Possible cause Step Check Result Remedy
Main PCB 1 Is it possible to print the test
page with the method of
Subsection 10.1 ‘Test Print
Mode’ in this chapter?
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, printer
condition and system
environment.
M-12 Engine interface error
Possible cause Step Check Result Remedy
Fixing unit
ground wire
connection
1 Is the ground wire on the fixing
unit secured with the shoulder
screw correctly?
No Secure the ground wire
correctly with the shoulder
screw.
Harness
connection
failure
2 Is the connection between
connector P6 on the main PCB
and connector P3 on the
engine PCB secure?
No Reconnect the connectors
securely.
Engine PCB 3 Is the problem solved by
replacing the engine PCB?
Yes Replace the engine PCB.
Main PCB 4 Is the problem solved by
replacing the main PCB?
Yes Replace the main PCB.
M-13 PCI BUS error (HL-1270N only)
Possible cause Step Check Result Remedy
Harness
connection
failure
1 Is the connection between
connector P21 on the main
PCB and connector P1 on the
network board secure?
No Reconnect the connectors
securely.
Network board 2 Is the problem solved by
replacing the network board?
Yes Replace the network board.
Main PCB 3 Is the problem solved by
replacing the main PCB?
Yes Replace the main PCB.
PR99210