I am receiving an sc491 error on my /ricoh MPC 3500.
Replace drum black and swing to drum yellow....
Sc 491 straight from manual
High voltage power: Drum/ development bias output error
An error signal is detected for 0.2 seconds when charging the drum or
development.
High voltage leak
Broken harness
Defective drum unit or development unit
Defective high voltage supply unit
1. Check or replace the harness.
2. Replace the drum unit or paper transfer unit.
3. Replace the high voltage supply unit.
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