Ricoh G147 Service Manual page 166

the paper tray unit due to receiving a
break signal.
Communication timeout error
between BICU and LCT
The BICU cannot receive a response
626 D
within 100 ms after 3 attempts after
attempting to communicate with the
LCT.
Communication break error between
BICU and LCT
627 D
The BICU cannot communicate with
the LCT unit due to receiving a break
signal.
Engine startup error
The BICU failed to respond with the
670 D
prescribed time when the machine
was turned on.
Controller startup error
672 D
After power on, the line between
G147
connection defective
Optional paper tray unit
interface board defective
BICU board defective
Serial line connecting BICU and
LCT unit unstable
External noise
BICU board and LCT main
board connection defective or
loose
LCT interface board defective
BICU board defective
Serial line connecting BICU and
LCT unit unstable
External noise
BICU board and LCT main
board connection defective or
loose
LCT interface board defective
BICU board defective
Connections between BICU
and controller board are loose,
disconnected, or damaged
Replace the BICU
Replace the controller board
Controller stalled
4-16 SM