bizhub 350 drum problem

[goldencup]

Hi i would like to ask about bizhub 350. some of my units have drum scratch (i think it is cause by the collar of the transfer roller). Why does this happen? Is there something that i should look on my transfer unit or does the collar on the developing unit also affect this. Thank you very much


12363

12362

[Hansoon]

Likely the seals of the mag roller are torn or have a hole in it. This happens when the rear mag roller collar is worn.

Though the little collar on the transfer roller can make some markings, I have never seen one tearing the surface of the drum although it would be perhaps imaginable.

Hans

[tech51]

Judging by the scuff marks on the drum, the dev unit is worn. I would replace thesel 4 parts. Drum, developer,developer unit and transfer roller...

[mrwho]

Of course before replacing the entire developing unit, you could try to replace just the mag roller collars plus the mylars - it usually does the trick. Then, after confirming all goes okay and the mylar doesn't get eaten, go for the drum+cleaning blade. That mark on the drum could bring more problems, as the charge corona charges the aluminum, causing odd behaviour.

[minimerlin]

Remember that the transfer roller has life! Look at the horns that run on the drum ends, they should not be concave at all, if they are change the transfer roller!

[eg101]

I usially go ahead and change the developer unit every other developer change. Saves a lot of drums and calll-backs.

[empiru]

I saw this in many Bizhub 250/ 350 and even in the Di2510/ 3510 - but as far as I can see in the picture, that scratch is outside of the printing area, right? Correct me if I'm wrong - but if I'm not - why do you bother?

[mrwho]

I saw this in many Bizhub 250/ 350 and even in the Di2510/ 3510 - but as far as I can see in the picture, that scratch is outside of the printing area, right? Correct me if I'm wrong - but if I'm not - why do you bother?

I've had charging problems related to that piece of metal showing up on the drum.

[blackcat4866]

mrwho: ... like drum ground bars crossing the page at 95mm intervals? =^..^=

[mrwho]

mrwho: ... like drum ground bars crossing the page at 95mm intervals? =^..^=

Never measured it, but I'd guess something like that, yeah.

[JR2ALTA]

I don't know the extent of your research, but at least half our drums get like that and we don't have charge issues. We leave it be unless it squeals or something. We try to make DEV units and trans roller last 2 PMs.

[ddude]

Replace the dev collars with the new and improved collars BEFORE you install the new developer unit, it will last longer....described here:

http://www.copytechnet.com/forums/sale-trade-wanted/33726-modified-collars-bizhub-200-250-350-di-series.html