No Bell Ring; Speaker Is Silent During On-Hook Dialing - Brother DCP-9010CN Service Manual

9.4

No Bell Ring.

Step
1 Ring delay
2 Ring volume
3 Connection
between main PCB
and NCU PCB
4 Speaker
5 NCU PCB
6 Main PCB
9.5

Speaker is Silent During On-hook Dialing.

Step
1 Connection
between main PCB
and speaker
2 Speaker
3 Connection
between main PCB
and NCU PCB
4 Connection
between main
PCB and panel
PCB
5 NCU PCB
6 Main PCB
Cause
Ring delay is set to "0".
Ring volume is set to
"OFF".
Are the main PCB and
NCU PCB connected
properly?
Is the problem solved
after replacing the
speaker unit?
Is the problem solved
after replacing the NCU
PCB ASSY?
Is the problem solved
after replacing the main
PCB ASSY?
Cause
Are the main PCB and
speaker connected
properly?
Is the problem solved
after replacing the
speaker unit?
Are the main PCB and
NCU PCB connected
properly?
Are the main PCB and
panel PCB connected
properly?
Is the problem solved
after replacing the NCU
PCB ASSY?
Is the problem solved
after replacing the main
PCB ASSY?
Check
Result
Yes
Yes
No
Yes
Yes
Yes
Check
Result
No
Yes
No
No
Yes
Yes
3-98
Remedy
Change the ring delay
settings to another
value.
Change the ring volume
setting to another value.
Reconnect the
connector properly.
Replace the speaker
unit.
Replace the NCU PCB
ASSY.
Replace the main PCB
ASSY.
Remedy
Reconnect the
connector properly.
Replace the speaker
unit.
Reconnect the
connector properly.
Reconnect the
connector properly.
Replace the NCU PCB
ASSY.
Replace the main PCB
ASSY.
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