: MPC 3500 with SC491

[duplicators]

Any help thanks

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[slimslob]

From Goose's Guide

B222/B224/G878	SC 491	Drum/dev bias error - replace drum unit(s)
B222/B224/G878	SC 491	Drum/dev bias error - replace high voltage supply unit
B222/B224/G878	SC 491	Drum/dev bias error - replace paper transfer unit

[skynetto]

Check bias drum pin on the machine side. Happens to me last week on the black one. Someone has taken the PCU out and bend the pin on the frame of the machine.

[duplicators]

Ok im going to check thanks

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[bob marley]

Sc 491 is an error signal detected for 0.2 seconds when charging the drum or development
Possible Cause • High voltage leak
• Broken harness
• Defective drum unit or development unit
• Defective high voltage supply unit