Brother DCP7010 Service Manual page 247

F-5
Speaker is silent during on-hook dialing.
Possible cause
Connection
between main
PCB and speaker
Speaker
Connection
between main
PCB and NCU
PCB
Harness between
main PCB and
NCU PCB
Connection
between main
PCB and control
panel PCB
Harness between
main PCB and
control panel PCB
NCU PCB
Main PCB
F-6
Dialing function does not switch between "tone" and "pulse".
Possible cause
Connection
between main
PCB and NCU
PCB
Harness between
main PCB and
NCU PCB
NCU PCB
Main PCB
Check
Step
1 Main PCB and speaker
are properly connected.
2 Replacement of speaker
solves the problem.
3 Main PCB and NCU
PCB are properly
connected.
4 Harness is damaged.
5 Main PCB and control
panel PCB are properly
connected.
6 Harness is damaged.
7 Replacement of NCU
PCB solves the
problem.
8 Replacement of main
PCB solves the
problem.
Check
Step
1 Main PCB and NCU
PCB are properly
connected.
2 Harness is damaged.
3 Replacement of NCU
PCB solves the
problem.
4 Replacement of main
PCB solves the
problem.
Result
No Fix the connection properly.
Yes Replace the speaker with a
normal part.
No Fix the connection properly.
Yes Replace the harness with a
normal part.
No Fix the connection properly.
Yes Replace the harness with a
normal part.
Yes Replace the NCU PCB with a
normal part.
Yes Replace the main PCB with a
normal part.
Result
No Fix the connection properly.
Yes Replace the harness with a
normal part.
Yes Replace the NCU PCB with a
normal part.
Yes Replace the main PCB with a
normal part
9 -5 9
Remedy
Remedy
Confidential