Ricoh B286 Service Manual page 231

D Controller startup error
After power on, the line between the
controller and the operation panel did
672
not open for normal operation.
-or-
After normal startup, communication
with the controller stopped.
690 D VDB communication error
There was no serial communication with
the VDB within 1 sec. after power on.
SM
! Controller installed incorrectly
! Controller board defective
! Operation panel harness
disconnected or defective
VDB-to-MCU harness or
!
connectors broken, loose,
defective
! VDB defective
! MCU defective
4-13
SC Code Descriptions
B286/B289