Bizhub c451 imaging unit printing faint

[Gergő]

I'm presently battling a KM C650 with that same problem, but all colors are weak. I noted that the latent image on the X-fer belt is full, but cannot get all of image transfered to paper. I have replaced all IU's, X-fer belt and roller, PRCB, HVPS-2 and checked sontinuity on wire harness. At my witts end right now. Have absolutely no idea what's going on. Any new ideas?

I had the same error. Only EEPROM board change soved the problem. Dont ask me why!

[OutlawTorn]

Im having a similar issue with the black image unit on one of these - is it a different process to fix?

Fitted two IU's in the last month and both have gone bad in a few weeks?