Brother MFC-7450

1-55
Confidential
■ No ringing sound.
Step Cause Check Result Remedy
1
Ring delay Ring delay is set to "0".
Ye s
Change the ring delay
settings to another value.
2
Ring volume Ring volume is set to
"OFF".
Ye s
Change the ring volume
setting to another value.
3
Connection
between main
PCB and NCU
PCB
Are the main PCB and
NCU PCB connected
correctly?
No
Reconnect the connector.
4
Speaker Is the problem solved
after replacing the
speaker?
Ye s
Replace the Speaker.
5
NCU PCB Is the problem solved
after replacing the NCU
PCB ASSY?
Ye s
Replace the NCU PCB
ASSY.
6
Main PCB Is the problem solved
after replacing the main
PCB ASSY?
Ye s
Replace the main PCB
ASSY.