Brother MFC-9320CW - No Bell Ring; Speaker Is Silent During On-Hook Dialing

3-97
Confidential
9.4 No Bell Ring.
9.5 Speaker is Silent During On-hook Dialing.
Step Cause Check
Result
Remedy
1 Ring delay Ring delay is set to “0”. Yes Change the ring delay
settings to another
value.
2 Ring volume Ring volume is set to
“OFF”.
Yes Change the ring volume
setting to another value.
3 Connection
between main PCB
and NCU PCB
Are the main PCB and
NCU PCB connected
properly?
No Reconnect the
connector properly.
4 Speaker Is the problem solved
after replacing the
speaker unit?
Yes Replace the speaker
unit.
5 NCU PCB Is the problem solved
after replacing the NCU
PCB ASSY?
Yes Replace the NCU PCB
ASSY.
6 Main PCB Is the problem solved
after replacing the main
PCB ASSY?
Yes Replace the main PCB
ASSY.
Step Cause Check
Result
Remedy
1 Connection
between main PCB
and speaker
Are the main PCB and
speaker connected
properly?
No Reconnect the
connector properly.
2 Speaker Is the problem solved
after replacing the
speaker unit?
Yes Replace the speaker
unit.
3 Connection
between main PCB
and NCU PCB
Are the main PCB and
NCU PCB connected
properly?
No Reconnect the
connector properly.
4 Connection
between main
PCB and panel
PCB
Are the main PCB and
panel PCB connected
properly?
No Reconnect the
connector properly.
5 NCU PCB Is the problem solved
after replacing the NCU
PCB ASSY?
Yes Replace the NCU PCB
ASSY.
6 Main PCB Is the problem solved
after replacing the main
PCB ASSY?
Yes Replace the main PCB
ASSY.