Ricoh G157 Service Manual page 135

L-2
The operation panel does not work.
Possible cause Step
Key sticking 1
Connection 2
between BCU,
controller and
operation panel
PCB
Harness 3
between BCU,
controller and
operation panel
Rubber key 4
Control panel 5
PCB
Controller 6
SM
Check
A key on the operation
panel is stuck.
BCU, controller, and
operation panel PCB are
properly connected.
Harness is damaged.
Replacement of rubber
key solves the problem.
Replacement of
operation panel PCB
solves the problem.
Replacement of PCB
solves the problem.
4-45
OPERATION PANEL
Result Countermeasure
Clean the panel cover or
Yes remove the burrs from
panel cover and panel keys
Fix the connection.
No
Replace the harness.
Yes
Replace the rubber key
Yes
Replace the operation panel
Yes PCB.
Replace the BCU and/or
Yes
controller.
G157