Ricoh G147 Service Manual page 152

The machine reboots automatically when the machine issues a Level "D" SC code.
This is done for Level "D" SC codes only.
Never turn off the power switch when the power LED is lit or flashing.
The power LED lights or flashes while machine is communicating with the network
server, or while the machine is accessing the hard disk or memory.
Charge roller current leak
Charge leak detected when charge
302 D
was applied to the charge roller. The
upper limit of PWM duty was
detected (65%) for 60 ms.
Charge roller current correction error
The charge roller bias correction was
done twice but maximum charge
304 D
was not detected even after the
maximum charge roller bias (–2kV)
was applied to the roller.
F-Gate error
No laser signal. The laser write
321 D
signal (F-GATE) did not go to LOW
within 60 sec. after the copy paper
reached the registration sensor.
Synchronization error
The synchronization signal was not
322 D
issued within 500 ms after the LD
fired while the polygon motor was
turning at the prescribed number of
G147
Charge roller damaged
HVPS pack defective
PCU harness defective or
disconnected
Charge roller defective due to
excessive wear
BICU board defective
PCI harness between the
controller board and the BICU
defective or disconnected
Laser synchronization board
connectors or harness loose,
disconnected, or damaged
Laser synchronization board
defective or out of position
4-2 SM