Mx-C300w Black mark issue

[Bearl]

Re: Mx-C300w Black mark issue

I concur. I would go with a DV unit. The thing that stumps me is that you say you can see the print in the line that is left on the drum? That almost leads me to think LSU. I have seen some bizzare stuff from bad LSU units in the past.

Thanks Moose! I know you guys are saying dev unit, but I'm not sure how it could be that when there are no strange marks/anomalies on the mag roller. Shame I cant swap the colour and K dev around just to test.

The laser unit could be the issue still ( ive opened it up and cleaned the mirrors - no apparent issues here) which leads me to a electronic fault here somewhere. Yeah the negative text in the black mark on the drum and on the prints leads me to think LSU also. I have some strangeassed faults with LSU just lately ( eg a samsung which just stopped printing any black, no errors no nothing, all colours still working - basically swapped the whole machine around finally changed the LSU and bingo K back on the page! ) so I'm not discounting that at all

Worst part is I dont have any spares at all to interchange with this machine, not keen to buy parts randomly to replace. I hate when I cant put my finger on the fault!!

I appreciate eveyones' help here!

[Greg Kinloch]

Re: Mx-C300w Black mark issue

Almost positive it will only be the Laser if the black line has a different pattern and length every time. I still have to go with Moose and others after looking through all the posts that the DV unit is the issue.

[kdr363]

Re: Mx-C300w Black mark issue

Brush away toner/developer in the area on the magroller. Any buildup on the aluminum sleeve?

[ntbann]

Re: Mx-C300w Black mark issue

Not sure about this model but on other Sharp color boxes you could switch the base plate on the DV unit. This would let you to see if the defect follows the DV unit.

[dannys]

Re: Mx-C300w Black mark issue

Dit you tried to print white pages?

[Bearl]

Re: Mx-C300w Black mark issue

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]

Re: Mx-C300w Black mark issue

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

[Michmich123]

Re: Mx-C300w Black mark issue

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 .