Ricoh G157 Service Manual page 139

F-5 Speaker is silent during on-hook dialing.
Possible cause Step
Connection 1
between
controller and
speaker
Speaker 2
Connection 3
between
controller and
NCU PCB
Harness 4
between
controller and
NCU PCB
Connection 5
between
controller and
operation panel
PCB
Harness 6
between
controller and
operation panel
PCB
NCU PCB 7
Controller 8
F-6
Dialing function does not switch between "tone" and "pulse".
Possible cause Step
Connection 1
between
controller and
NCU PCB
Harness 2
between
controller and
NCU PCB
NCU PCB 3
Controller 4
SM
Check
Controller and speaker
are properly connected.
Replacement of speaker
solves the problem.
Controller and NCU PCB
are properly connected.
Harness is damaged.
Controller and operation
panel PCB are properly
connected.
Harness is damaged.
Replacement of NCU
PCB solves the problem.
Replacement of PCB
solves the problem.
Check
Controller and NCU PCB
are properly connected.
Harness is damaged.
Replacement of NCU
PCB solves the problem.
Replacement of PCB
solves the problem.
4-49
FAX PROBLEMS
Result Countermeasure
Fix the connection.
No
Replace the speaker.
Yes
Fix the connection.
No
Replace the harness.
Yes
Fix the connection.
No
Replace the harness.
Yes
Replace the NCU PCB.
Yes
Replace the BCU and/or
Yes
controller.
Result Countermeasure
Fix the connection.
No
Replace the harness.
Yes
Replace the NCU PCB.
Yes
Replace the BCU and/or
Yes
controller.
G157