Bizhub 420 lines on drum

[JR2ALTA]

Re: Bizhub 420 lines on drum

Are you rebuilding the same drum carriage? If not replace the carriage.

[907tec]

Re: Bizhub 420 lines on drum

My vote is for the grid+corona. Those grids don't seem to like being cleaned, I end up replacing them and the wires pretty often. Really, really, really hate the 420/421 series.

[allan]

Re: Bizhub 420 lines on drum

From a cost point of view its a very cheap machine to run.

[mrfuser]

Re: Bizhub 420 lines on drum

Ok new drum unit and developer unit and blade and developer material. Ran great for about a week and lines are back on brand new dv unit!

help!

[Synthohol]

Re: Bizhub 420 lines on drum

are they running just plain paper or maybe something with embossing on it?

[mrfuser]

Re: Bizhub 420 lines on drum

Nope just plain paper

[Synthohol]

Re: Bizhub 420 lines on drum

Ok. A weird repeating pattern loke that I just roll one line on top of the next to see the diameter of the roller or gear responsible for the lines.
Because it seems to not entirely affect one edge of the copy I would look at the 2nd transfer roller in the door for a broken gear or something in the cogs.

[CraigW]

Re: Bizhub 420 lines on drum

Got any pix of the damaged drums ??
Are you certain it's not the T/S plastic guide causing damage ??

Might be time to call it....... too $$$$. Sounds like something else was done that they have failed to mentioned.

I will shed NO tears when the 420s - 501s are gone.

[mrfuser]

Re: Bizhub 420 lines on drum

You can see the lines on the dv roller, drum and all else look fine.

[CraigW]

Re: Bizhub 420 lines on drum

So the lines on original, and replacement dev units line up when both setting sided by side ??

[CPI]

Re: Bizhub 420 lines on drum

could be the black plastic grid on the transfer/ separtion corona is not completely seated and scratching the drum.

[mrfuser]

Re: Bizhub 420 lines on drum

Drum is fine. Lines not same on original dv unit

[Copier Addict]

Re: Bizhub 420 lines on drum

Ok. A weird repeating pattern loke that I just roll one line on top of the next to see the diameter of the roller or gear responsible for the lines.
Because it seems to not entirely affect one edge of the copy I would look at the 2nd transfer roller in the door for a broken gear or something in the cogs.

These don't have a transfer roller. They have a T/S corona.

[KingofMorton]

Re: Bizhub 420 lines on drum

The lines only show up on the DV unit and did so on a new one? Check how your DV box is sitting on the tracks when it slides in. They may be messed up and you are damaging the mag roller when sliding it in the machine. That is the only way you are going to get a damaged mag roller in a new dv unit and still have a good drum. Either that or the toner has rocks in it.

[mrfuser]

Re: Bizhub 420 lines on drum

No lines running direction of copy and not hitting anything.