Mx-C300w Black mark issue

[Bearl]

Dit you tried to print white pages?

Sure did it still left marks on the page. Got worse when I did colour.

So an update, I was able to change the back plate over with the cyan dev tank and swapped that and the black over , block up all the toner points and got one page out of the machine before it cracked it because it wanted to do toner feed. So the page that came out didn't have any of the marks on it! That must have been the problem. Happy days!!

So I ordered a new black dev unit in and installed it. The marks went away for 5 or so pages then came straight back just like before. WTF SHARP MACHINE!@!@!

I've spoken to the customer and we're cutting our losses with this one as I've spent too much time and now parts and without a good resolution. Thanks to everyone for your help on this one, off to the rubbish

Cheers,

Brad

[boutn]

After reading everyting here...my guess would be dirty Polygon motor mirrors...

[Michmich123]

Polygonmirror Will Not make this issue.
If polgon is Dirty the bw Print have Many many strips in lsu-Scan Direktion. The Sync-Signal can Not be Detect . In Color all is Fine.

I think there is a Problem with primary belt of Fuser .