No Bell Ring - Brother DCP-9040CN Service Manual

No bell ring.

Step Possible cause
Ring delay
1
Ring volume
2
Connection
3
between main
PCB and NCU
PCB
4 Harness between
main PCB and
NCU PCB
5 Speaker
NCU PCB
6
7
Main PCB
Check
Ring delay is set to "0".
Ring volume is set to
"OFF".
Are the main PCB and
NCU PCB connected
properly?
Is the harness damaged?
Is the problem solved
after replacing the
speaker?
Is the problem solved
after replacing the NCU
PCB ASSY?
Is the problem solved
after replacing the main
PCB ASSY?
1-70
Remedy
Result
Yes Change the ring delay
settings to another value.
Yes Change the ring volume
setting to another value.
No
Reconnect the connector
properly.
Yes Replace the harness with
a normal one.
Yes Replace the Speaker.
Yes
Replace the NCU PCB
ASSY.
Yes Replace the main PCB
ASSY.
Confidential