KM Bizhub C654 Cyan Banding

[knperformance]

Secondary transfer roller possibly. Have you tried adjusting voltages for it?

Yes tried that also .

[occus]

If the transferbelt is outside, can you check the position (height) of the IU C, can you see any difference to the other IU's?

I had on the 452/552/652 series sometime problem with IU's that make problems on other IU's, maybe change the other IU's too.
or sometime i change the IU which also have problems (faulty series)