Ricoh A250 Service Manual page 288

SERVICE CALL CONDITIONS
SC302: Charge Roller Current Leak
Definition: [B]
A current leak signal for the charge roller is detected.
Possible Causes:
• Charge roller damaged
• Power pack-B/C/T
• Poor connection of the OPC drum in the all-in-one cartridge
SC320: Polygonal Mirror Motor Error
Definition: [B]
The lock signal for the polygon mirror motor is not detected within 4 seconds
after the polygon motor on signal, or the lock signal is not activated for more
than 200 ms after the polygon motor lock signal.
Possible Causes:
• Polygonal mirror motor defective
• Poor connection between the polygonal mirror motor driver and the BICU
board
• BICU board defective
SC321: No Laser Writing Signal (F-GATE) Error
Definition: [B]
The laser writing signal (F-GATE) is still not LOW when the laser writing area
+5 mm has passed since the laser writing start position on the drum.
Possible Causes:
• BICU board defective
• MSU board defective
• The fax controller or printer controller has a poor connection.
• Fax controller or printer controller defective
SC322: Laser Synchronization Error
Definition: [B]
The laser synchronization signal cannot be detected by the main scan
synchronization detector board for more than 5 consecutive 100 intervals.
Possible Causes:
• The cable between the laser synchronization detector board and the BICU
board has a poor connection.
• Laser synchronization detector board out of position
• Laser synchronization detector board defective
• BICU board defective
• LD unit defective
A250 7-4 SM