Brother HL-1850 Service Manual page 218

CHAPTER 6 TROUBLESHOOTING
M-13 PCI BUS error
Possible cause
Harness
connection
failure
Network board
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 Reconnect the connectors
securely.
Yes Replace the network board.
Yes Replace the main PCB.
6-34
Remedy