Ricoh G157 Service Manual page 137

F-2 Speed dialing and One-touch dialing can't be used.
Possible cause Step
Speed dialing, 1
One-touch
dialing
Dialing mode 2
setting
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
Rubber key 7
NCU PCB 8
Control panel 9
PCB
SM
Check
A fax transmission can
be made using the ten-
key pad?
Dialing signal (PB or DP)
comes out normally in
each mode. (Use a
telephone line emulator
if necessary.)
Controller and NCU PCB
are properly connected.
Harness is damaged.
Controller and operation
panel PCB are properly
connected.
Harness is damaged.
Replacement of rubber
key solves the problem.
Replacement of NCU
PCB solves the problem.
Replacement of
operation panel PCB
solves the problem.
4-47
FAX PROBLEMS
Result Countermeasure
Replace the BCU and/or
Yes controller.
Check the dialing mode
setting at the customer's
again.
Yes
Check the telephone line
cord between the machine
and the line socket.
Fix the connection.
No
Replace the harness.
Yes
Fix the connection.
No
Replace the harness.
Yes
Replace the rubber key.
Yes
Replace the NCU PCB.
Yes
Replace the operation panel
Yes PCB.
G157