Operation Panel - Ricoh G157 Service Manual

OPERATION PANEL

4.7 OPERATION PANEL
L-1
Nothing is displayed on the LCD.
1. Check if the power switch is turned off.
Possible cause
Connection
between BCU
and operation
panel PCB
Harness
between BCU,
controller, and
operation panel
PCB
Connection
between BCU
and low-voltage
power supply
PCB
Harness
between BCU
and low-voltage
power supply
PCB LCD
LCD
Operation panel
PCB
Low-voltage
power supply
PCB
Controller
G157
Step Check
1 BCU, controller and
operation panel PCB are
properly connected.
2 Harness is damaged.
3 BCU and low-voltage
power supply PCB are
properly connected.
4 Harness is damaged.
5 Replacement of LCD
solves the problem.
6 Replacement of
operation panel PCB
solves the problem.
7
Replacement of low-
voltage power supply
PCB solves the problem.
8 Replacement of PCB
solves the problem.
Result
No
Yes
No
Yes
Yes
Yes
Yes
Yes
4-44
Countermeasure
Fix the connector properly.
Replace the harness.
Fix the connection properly.
Replace the harness.
Replace the LCD.
Replace the operation panel
PCB.
Replace the direct current
unit (low-voltage power
supply PCB).
Replace the BCU and/or
controller.
SM