Cyan halftone pattern color off

[BWMMA]

I have a Bizhub C558 that is having an issue with cyan. All other colors look fine, but the cyan halftone pattern is only printing solid cyan on the bottom but is light colored the rest of the way across the page (image attached) machine has "drum/developing unit error (C)" and stabilizer always says NG.


IMG_E5349.jpg

What I've done already:
-replaced cyan drum and developing unit
-replaced high voltage board
-replaced transfer belt
-replaced FRB

The problem still persists after replacing these parts, any ideas of what it could be?

[EarthKmTech]

Check the operation of the locking cams (connected to the blue drum locking lever) and ensure the developing unit is being pressed against the drum correctly.

[Gaffers01]

Looks like a drum unit issue!

Is it a genuine cyan drum unit or a black one changed to colour as i think you haven't taken all the right bits off

[BWMMA]

@Gaffers01 - the cyan drum is a genuine drum from Konica Minolta. no chip swaps or anything

[BWMMA]

@EarthKMtech - I'll take a look at the locking cams and I'll reply back afterwards to let you know if that was the issue or not

[BWMMA]

@EarthKmTech- I checked the locking cams on the front-side and back-side. Both lift up fine and levels dev. unit with drum, but the issue still persists.

[Gaffers01]

@EarthKmTech- I checked the locking cams on the front-side and back-side. Both lift up fine and levels dev. unit with drum, but the issue still persists.

Try swapping the yellow drum in there and see if that makes any difference?
if not swap the yellow developer unit with the cyan and see if it makes any difference?

[BWMMA]

Thank y'all for the help, I just figured out what was causing the issue. I pulled out the new transfer belt I installed and a piece of plastic was broken near the cyan pressure roller in the belt causing one side to not make contact (pictures attached) the left side picture is where it broke and the right side picture is what the other pressure roller spots that aren't damaged for comparison. I put a used transfer belt in and cyan prints like it should. The new transfer belt must've came damaged in the box.



image0 (1).jpgimage1 (1).jpeg

[tsbservice]

Thank y'all for the help, I just figured out what was causing the issue. I pulled out the new transfer belt I installed and a piece of plastic was broken near the cyan pressure roller in the belt causing one side to not make contact (pictures attached) the left side picture is where it broke and the right side picture is what the other pressure roller spots that aren't damaged for comparison. I put a used transfer belt in and cyan prints like it should. The new transfer belt must've came damaged in the box.



image0 (1).jpgimage1 (1).jpeg

That's some bad luck. So you probably first replaced ITB unit and then start chasing your tail....

[blackcat4866]

That kind of damage can occur when removing or installing the primary transfer belt unit. I saw it especially on the xx4e series. It was necessary to remove a few pieces from the outer door to get the belt unit out. If a person were to just force it out ... that's what you get. =^..^=