Ricoh M C250FW, Field Service Manual

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6.Troubleshooting
199
SC No. Type Error Name/Error Condition/Major Cause/Solution
1.
Replace the ITB unit.
2.
Reconnect the connectors.
3.
Replace the ITB contact sensor (S6).
4.
Replace the ITB contact motor (M6).
5.
Replace the TM/P sensor (S8).
6.
Replace the EGB (PCB1).
SC No. Type Error Name/Error Condition/Major Cause/Solution
SC491-
00
D High voltage power: Charge/development/transfer bias output error
An error signal was detected continuously for 200 msec during charge bias,
development bias, and transfer bias output.
Hardware related causes:
•
Contact failure
•
Loose, broken, or defective connector on the controller side
•
Grounding, open-circuit in the high voltage route
•
Arc discharge due to lack of space
•
The shorted harness on the controller side
•
Engine board malfunction due to signal error
•
Defective HVPS (PCB3)
Load related causes:
•
Short-circuit
•
Arc discharge due to lack of space
•
Drum deterioration, or condensation on drum caused by overcurrent
•
Drum condensation, pinhole overcurrent
•
The incorrect gap between the drum and charge roller
•
Overcurrent due to condensation on the drum surface
•
Increase in transfer roller impedance (Low-temperature environment, due to
dirt )
•
Open-circuit in the power supply route
Check if the SC occurs by turning the power OFF then ON. If the SC occurs again,
do the following steps. Check if the SC reoccurs by cycling the power after each
step.
1.
Re-install the AIO cartridges.
2.
Check if there are scratches on the drum surface. If you can see the internal
element of the drum (bare metal) on the surface, replace the AIO.
3.
Re-install the paper transfer roller.
4.
Replace the paper transfer roller or unit.
5.
Reconnect the CN220 connector on the EGB (PCB1).