Brother DCP-9040CN Service Manual page 90

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Speaker is silent during on-hook dialing.
Step
Possible cause
Connection
1
between main
PCB and speaker
Speaker
2
Connection
3
between main
PCB and NCU
PCB
4
Harness between
main PCB and
NCU PCB
Connection
5
between main
PCB and control
panel PCB
Harness between
6
main PCB and
control panel PCB
7
NCU PCB
8
Main PCB
Dialing function does not switch between "tone" and "pulse".
Step
Possible cause
1
Connection
between main
PCB and NCU
PCB
Harness between
2
main PCB and
NCU PCB
NCU PCB
3
4
Main PCB
Check
Are the main PCB and
speaker connected
properly?
Is the problem solved
after replacing the
speaker?
Are the main PCB and
NCU PCB connected
properly?
Is the harness damaged?
Are the main PCB and
control panel PCB
connected properly?
Is the harness damaged?
Is the problem solved
after replacing the NCU
PCB ASSY?
Is the problem solved
after replacing the main
PCB ASSY?
Check
Are the main PCB and
NCU PCB connected
properly?
Is the harness damaged?
Is the problem solved
after replacing the NCU
PCB ASSY?
Is the problem solved
after replacing the main
PCB ASSY?
1-71
Remedy
Result
No
Reconnect the connector
properly.
Yes
Replace the Speaker.
No
Reconnect the connector
properly.
Yes
Replace the harness with
a normal one.
No
Reconnect the connector
properly.
Yes
Replace the harness with
a normal one.
Yes
Replace the NCU PCB
ASSY.
Replace the main PCB
Yes
ASSY.
Remedy
Result
No
Reconnect the connector
properly.
Yes
Replace the harness with
a normal one.
Yes
Replace the NCU PCB
ASSY.
Yes
Replace the main PCB
ASSY.
Confidential

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