Mpc4500 sc491

[mrfuser]

Does anyone know which PCU it refers to on this code or is it just something you have to check them all?

[slimslob]

Re: Mpc4500 sc491

If it occurs during B/W copying and printing, start with the black.

[ruben]

Re: Mpc4500 sc491

From Goose's Guide:

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

From Ricoh Tech Tier 2 (ignore the references to the cyan drum, check all drums instead):
[Symptom]
SC491 cannot be reset.
When the SC does not occur, color banding occurs at the cyan drum pitch when color copying.


[Cause]
A pin hole has occurred in the cyan OPC drum.
When the drum unit was pulled out and checked, a large amount of toner was stuck to only the top of the color OPC drums. If there is only black, the black OPC drum is faulty.
[Resolution]
Replace the cyan optical drum.

It occurs on the OPC drum for each color so you must investigate to determine which OPC drum is faulty.

[mrfuser]

Re: Mpc4500 sc491

Looks like all colors are coated and not cleaning. Anyone think power supply bad? Swapped cyan and did nothing.

[slimslob]

Re: Mpc4500 sc491

Since process is write to no charge, it sounds like no charge voltage.

[mrfuser]