Ricoh G157 Service Manual page 138

FAX PROBLEMS
F-3
Fax messages can't be received.
1. Check that the telephone cord is securely inserted.
Possible cause
Receive mode
setting
NCU PCB
Controller
F-4
No ring tone.
Possible cause
Ring delay
Ring volume
Connection
between
controller and
scanner unit
Harness
between
controller and
scanner unit
Connection
between
controller and
NCU PCB
Harness
between
controller and
NCU PCB
Speaker
NCU PCB
Controller
G157
Step Check
1 Receive mode is set to
automatic receive mode.
2
Replacement of NCU
PCB solves the problem.
3 Replacement of PCB
solves the problem.
Step Check
1 Ring delay is set to "0".
2 Ring volume is set to
"OFF".
3 Controller and scanner
unit are properly
connected.
4 Harness is damaged.
5 Controller and NCU PCB
are properly connected.
6 Harness is damaged.
7 Replacement of speaker
solves the problem.
8 Replacement of NCU
PCB solves the problem.
9 Replacement of PCB
solves the problem.
Result
No
Yes
Yes
Result
Yes
Yes
No
Yes
No
Yes
Yes
Yes
Yes
4-48
Countermeasure
Set the receive mode to
automatic receive mode.
Replace the NCU PCB.
Replace the BCU and/or
controller.
Countermeasure
Set the ring delay to other
than "0".
Set the ring volume to other
than "OFF".
Fix the connection.
Replace the harness.
Fix the connection.
Replace the harness.
Replace the speaker.
Replace the NCU PCB.
Replace the BCU and/or
controller.
SM