Communication - Ricoh A109 Service Manual

SC558: Zero cross signal abnormal
- Definition - [A]
Zero cross signals are not detected within a certain period.
<Possible causes>
•
Main control board defective

1.9 COMMUNICATION

SC600: Communication error between main control and
panel boards
- Definition - [B]
Main CPU cannot communicate with the operation panel CPU properly.
<Possible causes>
•
Poor connection between the main control board and operation panel
board
•
Main board defective
•
Operation panel defective
SC601: Communication error between main control and scanner
control boards
- Definition - [B]
Main CPU cannot communicate with the scanner control CPU properly.
<Possible causes>
•
Poor connection between the main control board and scanner control
board (optical fiber cable)
•
Optical fiber cable defective
•
Main control board defective
•
Scanner control board defective
•
DC power supply board defective (No dc 5V input to scanner control
board)
A109 6-20
operation
FSM