Sc4Xx: Bias Leak - Ricoh SP 150 Field Service Manual

5. Troubleshooting
Code Level
220 D

SC4xx: Bias Leak

Code Level
491 D
68
Beam Synchronization Error
The top cover is closed and locked, and the polygon motor is locked, but laser
synchronization could not be achieved within 400 ms.
• The I/F harness of the LDB is loose, broken, or defective.
• The polygon motor is locked.
• The angle of incidence of the laser beam and photo-detector is not correct.
• Cycle the power OFF/ON.
• Replace the I/F harness.
• Replace the polygon motor.
• Replace the laser unit.
• Replace the main board.
Bias Leak
A bias leak has occurred for the drum charge, development charge, or transfer
charge.
PWM signals are sampled at 20 ms intervals. This SC is issued if 10 PWM
samplings within 200 ms are abnormal.
• The HVP harness is loose, broken, or defective.
• The HVP board is defective.
• The AIO terminal is defective.
• Cycle the power OFF/ON.
• Check all the harness connections of the HVP.
• Check the spring-loaded AIO terminal installation behind the HVP.
• Replace the HVP.
Details
Details