bizhub c500 sc28-04

[doomblack]

got an error code for c500, started as a sc29-06 cleaned the sensors and now its a sc28-04 something with the coronas i presume, any advice ?

[Kmdurrin]

CAUSE: Abnormal charge. Related codes to colors are as follows:
28-01 = yellow
28-02 = magenta
28-03 = cyan
28-04 = black
SOLUTION: In order, perform the following:
Switch Charge Corona with one of another color.
Change indicated color Charge Corona wire.
Switch Drum Potential Sensor (p/n 65AA-2282) with one of another color.
If the problem persists, replace HV-1 (p/n 65AA 8401 0).