Ricoh A250 Service Manual page 289

SC324: LD Drive Current Over
Definition: [B]
The LD drive board applies more than 100 mA to the LD.
Possible Causes:
• LD unit defective (not enough power, due to aging)
• Poor connection of the cable between the LD unit and the BICU board
• BICU board defective
SC391: Development Bias Leak
Definition: [B]
A development bias leak signal is detected.
Possible Causes:
• Defective development roller in the all-in-one cartridge.
• Power pack-B/C/T defective
SC401: Transfer Roller Positive Current Error
SC402: Transfer Roller Negative Current Error
Definition: [B]
A current leak signal for the transfer roller is detected.
The current feedback signal for the transfer roller is not detected.
Possible Causes:
• Power pack-B/C/T defective
• Transfer unit set incorrectly
• Poor connection of the drum unit in the all-in-one cartridge
• Transfer roller damaged
SC500: Main Motor Lock
Definition: [B]
The main motor lock signal is not detected for more than 700 ms after the main
motor starts to rotate, or the lock signal is not detected for more than 700 ms
during rotation after the last lock signal.
Possible Causes:
• Too much load on the drive mechanism
• Main motor defective
SM
SERVICE CALL CONDITIONS
7-5 A250