Ricoh Aficio 220 Service Manual page 299

SERVICE CALL CONDITIONS
SC392: TD sensor initial setting error
-Definition- [B]
TD sensor output voltage falls out of the adjustment range (2.0 ±<> 0.2 V) after
the TD sensor initial setting has been finished.
- Possible causes -
• Someone forgot to remove the toner seal of the PCU
• ID sensor defective
• TD sensor abnormal
• Drum does not turn
• Development roller does not turn
• Poor connection of the PCU
SC401: Transfer roller leak error 1
SC402: Transfer roller leak error 2
-Definition- [B]
A transfer roller current leak signal is detected.
The current feedback signal for the transfer roller is not detected.
- Possible causes -
• High voltage supply board defective
• Poor connection of the PCU
• Transfer/separation unit set incorrectly
• Transfer roller damaged
SC411: Separation bias leak error
-Definition- [B]
A separation bias leak signal is detected.
- Possible causes -
• High voltage supply board defective
• Poor connection of the PCU
• Discharge plate defective
SC500: Main motor lock
-Definition- [B]
A main motor lock signal is not detected for more than 500 ms after the main
motor starts to rotate, or the lock signal is not detected for more than 500 ms
during rotation after the last signal.
- Possible causes -
• Too much load on the drive mechanism
• Main motor defective
7-6
20 September 1999