Brother DCP-8085DN Service Manual page 144

■ Speaker is silent during on-hook dialing.
Step Possible cause
Connection
between main
1
PCB and
speaker
Speaker
2
Connection
between main
3
PCB and NCU
PCB
Harness
between main
4
PCB and NCU
PCB
Connection
between main
5
PCB and control
panel PCB
Harness
between main
6
PCB and control
panel PCB
NCU PCB
7
Main PCB
8
■ Dialing function does not switch between "tone" and "pulse".
Step Possible cause
Connection
between main
1
PCB and NCU
PCB
Harness
between main
2
PCB and NCU
PCB
NCU PCB
3
Main PCB
4
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?
3-72
Result Remedy
Reconnect the connector
properly.
No
Replace the Speaker.
Yes
Reconnect the connector
properly.
No
Replace the harness with a
normal one.
Yes
Reconnect the connector
properly.
No
Replace the harness with a
normal one.
Yes
Replace the NCU PCB
Yes ASSY.
Replace the main PCB
Yes ASSY.
Result Remedy
Reconnect the connector
properly.
No
Replace the harness with a
normal one.
Yes
Replace the NCU PCB
Yes ASSY.
Replace the main PCB
Yes ASSY.
Confidential