Mp c4500 copy quality problem

[COPIERMAN]

Customer complain of poor copy quality with magenta,cyan, green and blue colors. I am using a katun color test target when i print in color. Black and yellow print fine but cyan and magenta have white spots in it. Green square is green with blue spots and Blue is mostly magenta with a little blue. I have replace devlp powder and drum unit for both colors. Tried a different transport assy no difference also tried a different developer units for those colors same problem. I think it might be laser assy but not sure.

I would appreciate any help i could get on this problem.

Thanks

[sandmanmac]

Image troubleshooting is so much easier with samples to look at.
Upload some images please. - Both copy, AND internal test page

[Zaxxon]

The guide holding the Paper transfer roller tends to break in the inner plastic hinge.
Also take a look on the two stoppers for this unit in the machine, breaks in the top.

[COPIERMAN]

Image troubleshooting is so much easier with samples to look at.
Upload some images please. - Both copy, AND internal test page

just upload samples

[sandmanmac]

Black and yellow print fine but cyan and magenta have white spots in it.

Thanks

If you think Black and yellow look fine, then you'd better get your eyes checked. Each colour is as washed-out as the next.
How does the image look on the transfer belt?
I'm leaning towards a transfer roller, based on what you say you've done so far.

[nmfaxman]

I also call Transfer roller.
The pattern is the same on each color.

Bump up Transfer roller voltage just a bit and lower just a bit.

Pattern should change.

[NeoMatrix]

Just curious, are currently you using modified SPC811 PCU's in the machine ?

[gestetner tech]

Get a new transfer roller!
Btw do you use Ricoh genuine toner?

[copier tech]

You can confirm if it's a transfer problem if you stop the machine, remove or look at the image on the belt, if its good & solid then you know its a transfer issue.

Poor quality or damp paper will also cause this issue, open a new good quality packet of paper see if this helps.

[COPIERMAN]

I was told that a tech had change transfer roller assy from a fuser kit that was bought for another copier but fuser could be used. that roller was double the size. Giving him right transfer assy should fix problem.