Bizhub c258 Faded on OP Side only

[mrfuser]

Bizhub c258 works fine other than faded color on OP Side only. Blacks are fine. Replaced drums, transfer belt, transfer roller, reset stabilization and tried to run gradation many times with same faded result.

Any ideas?

Thanks all!

K

[copyman]

Is it when copying and printing? Did you run test pages in service mode of each color to see if just one color faded? My first thought is the color laser windows are dirty since you said black is ok. I would take dev units out and really clean those laser glasses with windex. You can see laser glass better with dev units out. Only things different from color & black are the drums, dev units & laser windows. One more thing came to mind, when you take dev units out do the colors have a good dev powder brush on mag rollers all the way to edge? Could be low on developer since these are only things you didn't replace....

[mrfuser]

All developers look fine and I even replaced cyan just to make sure. I’ll try cleaning the glass after removing the dv units to see if that helps. Unit only has about 75k total on it. Very odd

[mrfuser]

Laser windows cleaned with windex after removing DV units. same result. Hmmm
see pic

[copyman]

Laser windows cleaned with windex after removing DV units. same result. Hmmm
see pic

That photo confirms it's related to low developer. Seen it many times. Do you have another machine to swap developer units? Or as last resort go into service mode and manually add toner. By the way I've seen the level history showing 6%+ and still had low developer....

[mrfuser]

That was my thought. Replaced DV and same result. argh!

[copyman]

So you are saying all 3 colors CYM have the same test page like your magenta sample? That would be very strange for all 3 colors. Like I said I've seen those zebra stripes many times and was always low developer. Never all 3 colors at same time. Mostly cyan.The spaces between stripes are the size of dev mag roller and why evenly spaced apart.

Wouldn't think HV issue would cause those stripes but you never know.

I still would add toner in service mode, running a few cycles and see if gets any better.

Genuine toner?

[mrfuser]

yep, very odd. I have added toner in service mode to the point where they are 7+ and no change. baffled

[copyman]

Wow this is a strange one! Can't wait to hear what the fix is. So just to be clear all 3 colors have same zebra pattern?

[mrfuser]

yep all same pattern. so odd

[mrfuser]

ok, pulled the toner hopper assembly cover and watched when adding toner. The gears , small white ones on front, are not turning during any of the procedure. Only the bottle drive is turning. Took it out and cleaned it all and put back in with same result. Is there another way to test those gear drives?

Pulled back cover and yellow add toner motor, it is not turning. Whatever is supposed to power these motors seems to not be working.

OK< Removed all wires and motors and plugged all back in and now they are turning. I have added toner and even the new CYAN dev unit is still all showing the same output where the OP side is faded out.

I supposed next is the Laser assembly removal to see if anything is wrong there.


Any thoughts?

[mrfuser]

Is it possible that the transfer belt is not lifting properly? Anyone ever seen that?

[copytechtrouble]

Is it possible that the transfer belt is not lifting properly? Anyone ever seen that?

yeah I've seen that happen before.. it should be easy to check. remove belt and turn the gear to engage the colours on the belt. you should be able to tell if they are lifting evenly on both sides.

[Kenny]

just a thought are the CMY drums you replaced, have they been converted from a black drum? or are they original colour drums?

[Hansoon]

My guts are telling me that one side of the transfer belt is not lifted enough for whatever reason. Black is OK cause its always in contact with the TB.

Hans