Brother mfc8440 - Page 239

CHAPTER 6 TROUBLESHOOTING
6-32
F-4
No bell ring.
Possible cause Step Check Result Remedy
Ring delay 1
Ring delay is set to "0". Yes Set the ring delay to other
than "0".
Ring volume 2
Ring volume is set to "OFF". Yes Set the ring volume to other
than "OFF".
Connection
between main
PCB and NCU
PCB
3
Main PCB and NCU PCB are
properly connected.
No Fix the connection properly.
Harness
between main
PCB and NCU
PCB
4
Harness wire is damaged. Yes Replace the harness with a
normal part.
Speaker 5
Replacement of speaker
solves the problem.
Yes Replace the speaker with a
normal part.
Relay PCB 6
Replacement of relay PCB
solves the problem.
Yes Replace the relay PCB with a
normal part.
NCU PCB 7
Replacement of NCU PCB
solves the problem.
Yes Replace the NCU PCB with
a normal part.
Main PCB 8
Replacement of main PCB
solves the problem.
Yes Replace the main PCB with
a normal part.