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mrfuser
03-18-2016, 02:40 AM
Went out to replace drum and blade on this machine because client was complaining of lines on the drum. When we got there we surely saw the lines on the drum . Went ahead and cleaed the entire imaging unit replace the drum and the cleaning blade, started to make copies and the lines came back ! Now we have the same type of lines on the new drum. I do not see anything in this drum assembly that would cause these lines . Has anyone seen this happen before?

twotech
03-18-2016, 02:54 AM
Look very closely at the transfer coronna wires. It could be hung up on the grid. Next time don't post a sky shot.

minimerlin
03-18-2016, 10:00 AM
Looks to me that you have paper dust in the dev unit, dump the dev and vac out the tank ( remove the ATDC sensor before you vac) add new dev and all should be OK.

allan
03-18-2016, 11:36 AM
Time for PM service and all your troubles will disappear.

mrfuser
03-19-2016, 07:12 AM
Ok basically did everything except developer. So you are all in agreement if we do developer the lines will not appear on another new drum?

Blizzoo
03-19-2016, 12:51 PM
A quick look at developer brush will show if the "white lines" are coming from there. Alson replace DS-Rolls.

srvctec
03-19-2016, 01:42 PM
Looks like the charge corona wire or unit need to be replaced to me.

copier addict
03-21-2016, 01:58 AM
Looks like the charge corona wire or unit need to be replaced to me.

I'm pretty sure a charge issue wouldn't produce blank lines. I transfer problem, a dirty printhead or crud in the dev would.

CraigW
03-22-2016, 05:14 PM
A quick look at developer brush will show if the "white lines" are coming from there. Alson replace DS-Rolls.

DS roll kit is 200-362.

This is just a 7020 developing unit..... but agree, you should be able to tell by looking at the sleeve if it is the culprit.

mrfuser
03-23-2016, 02:12 AM
Arggh! Replaced drum and blade. Cleaned out dv unit and cleaned mag roller. Lines came back! They are etched into the drum! I saw them on the mag roller before cleaning and not after so I am stumped!

srvctec
03-23-2016, 02:56 AM
Arggh! Replaced drum and blade. Cleaned out dv unit and cleaned mag roller. Lines came back! They are etched into the drum! I saw them on the mag roller before cleaning and not after so I am stumped!
If the drum is actually physically scratched, then something in the cleaning/drum unit is rubbing the drum or the transfer/sep unit black guides aren't installed correctly and are rubbing the drum.

CraigW
03-23-2016, 09:05 PM
Have the old drum ??

Lines match up to recently installed one ??

mrfuser
03-24-2016, 12:50 AM
Yep they both seem to be in same place.

copytechman
03-24-2016, 01:40 PM
Like others have said, make sure the black plastic guides on the transfer unit are properly seated, they'll do a number on your drum if not seated properly.

Regards!

mrfuser
03-31-2016, 12:55 AM
Replaced everything and checked transfer guide, even put a dot of super glue to hold it for sure. All looked great for about 4 days and now client says lines are back!!!

argggghhhhh!!!!

JR2ALTA
03-31-2016, 05:59 AM
Are you rebuilding the same drum carriage? If not replace the carriage.

907tec
03-31-2016, 08:06 PM
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
03-31-2016, 08:41 PM
From a cost point of view its a very cheap machine to run.

mrfuser
05-16-2016, 11:20 PM
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
05-17-2016, 12:11 PM
are they running just plain paper or maybe something with embossing on it?

mrfuser
05-17-2016, 02:50 PM
Nope just plain paper

Synthohol
05-17-2016, 04:02 PM
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
05-17-2016, 05:08 PM
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
05-17-2016, 07:21 PM
You can see the lines on the dv roller, drum and all else look fine.

CraigW
05-17-2016, 07:41 PM
So the lines on original, and replacement dev units line up when both setting sided by side ??

CPI
05-18-2016, 02:34 AM
could be the black plastic grid on the transfer/ separtion corona is not completely seated and scratching the drum.

mrfuser
05-18-2016, 03:41 AM
Drum is fine. Lines not same on original dv unit

copier addict
05-18-2016, 02:41 PM
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
05-18-2016, 04:37 PM
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
05-18-2016, 06:25 PM
No lines running direction of copy and not hitting anything.

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