Ricoh M052 Service Manual page 441

Rev. 03/14/2012
672 Controller start up error
⇒
D
Controller stalled.
Controller board installed incorrectly.
Controller board defective.
Operation panel connector loose or defective.
The controller is not completely shut down when the main switch is turned
off.
Check the setting of SP5-875-001. If the setting is set to "1 (OFF)", change
it to "0 (ON)".
680
D BICU serial communication error: Time out
-001
-002 D BICU serial communication error: Retry error
-003 D BICU serial communication error: Download error
-004 D BICU serial communication error: UART error
The serial communication error occurs in the BICU.
Replace the BICU.
SM
After the machine is powered on, the communication between the
controller and the operation panel is not established, or
communication with controller is interrupted after a normal startup.
After startup reset of the operation panel, the attention code (FDH) &
the attention acknowledge code (FEH) is not sent from the controller
within 30 seconds.
After the controller issues a command to check the communication
line with the controller at 30 second intervals, the controller fails to
respond twice.
Noise
Defective BICU
6-15
Service Call Conditions
M052/M053/M054