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dickierock
11-14-2011, 03:43 PM
Hi all,have a customer with a km4035 who does a lot of booklets.Problem is evident on the attachment. The issue is highly intermittent,might occur after 50 page,300 pages or even 1000 pages,but obviously when they are doing runs of booklets it is rather annoying to have some booklets messed up in the middle of the run.
So far new transfer and drum,dev unit replaced,still an issue, checked transfer ,drum contacts on machine.There is no underlying background/overtoning issues when its running correctly.
The paper is fed into the machine as Short Edge Feed/landscape.The machine has 160k on it.
I have never seen copy quality issues on any of these machines that haven't been solved by transfer,drum,dev replacement.
Maybe some has had this before?
Thanks in advance.

milldew
11-14-2011, 04:25 PM
First guess, main charging. Just a gut feeling. I did see a bulletin on the contacts in the door that mate up to the machine for the transfer, but I think that would cause voids mainly. Swap the main charger, thats what I would do first.

dickierock
11-14-2011, 05:09 PM
Hi mildew,drum was replaced with new corona unit.

ES-OGT
11-14-2011, 08:21 PM
Are you using Generic or OEM toner?

I've seen this exact item happen when billable customers get their toner from somewhere else and it's generic. Swap out the dev unit and put OEM toner in and it'll purr like a kitten. You can also get brave and vacuum out the dev unit then put some OEM toner in with U130 but it's safer to just swap it out.

If they are using OEM toner might be a good idea to see if anyone has messed with the Dev Bias. Check it with the SM to see if it matches default.

mabawser
11-14-2011, 08:30 PM
have you cleaned out the filters? had weird pcq when the filters get blocked. supposedly not enough air flow through the machine...might explain the randomness?!

blackcat4866
11-15-2011, 01:02 AM
Ok. The document is A4 length, and the image defect appears to repeat at ~3.7 repetitions per A4 page length.

297mm/3.7 = 80.27mm roller circumference > 80.27/3.14159265 = 25.55mm roller diameter

So which roller is ~1" diameter? The only one even close is the developing roller. Throw in the intermittent nature of the problem, and I would look at the developer bias contact and the condition of the developing bearings. Perhaps something conductive like steel shavings have been drawn into the developing unit? =^..^=

rashid120
11-24-2011, 08:42 PM
I had same Problem Solved by changing the toner.Customer was using Duplicate toner.After 1 week Continues Struggle we got this Result. please Empty the Developing unit with vacuum cleaner and please use original kyoceramita toner.you can test the Toner on the front side Golden sticker by using Card.

Thanks and Regards


Raahid Iqbal:cool:

-ph-
11-27-2011, 06:40 PM
I'm pretty sure it has something to do with the toner, had same problems in the past...

tlf
11-28-2011, 03:26 AM
Black cat is right on I had this same problem on a 6030 turned out to be the developer bias electrode in contact with the cylinder had to call kyocera to get the part number. The contact was arcing and shorting

alamsandhu
11-28-2011, 03:47 AM
if there is toner issue it should be always same copy not intermittent problem also the dirty copy from backside there is problem with developing unit.



I had same Problem Solved by changing the toner.Customer was using Duplicate toner.After 1 week Continues Struggle we got this Result. please Empty the Developing unit with vacuum cleaner and please use original kyoceramita toner.you can test the Toner on the front side Golden sticker by using Card.

Thanks and Regards


Raahid Iqbal:cool:

ES-OGT
11-28-2011, 02:32 PM
if there is toner issue it should be always same copy not intermittent problem also the dirty copy from backside there is problem with developing unit.

That's not true. Toner issues can be intermittent if you've mixed OEM and generic toner in the dev unit. I've seen it happen.

Either replacing the dev unit or vacuuming it out is the only solution.

rashid120
11-28-2011, 03:17 PM
It was intermittent problem and solved by changing the toner only.


Thanks and Regards

Rashid Iqbal:cool:

dickierock
11-29-2011, 11:30 AM
Hi all,just to finish this up,
it was not the dev unit,drum unit,toner or transfer roller,all were swapped out/tested to 100% satisfaction.As per blackcat I rechecked the contacts for dev unit / drum etc.Upgraded firmware and generally rechecked everything. It has been tested extensively (2500 copies) and is working fine but I'm not convinced the issue is resolved.(it did previously run for 1400 copies without issue before it came back).My feeling is that there is a board issue at play here.The machine was located in an old unheated building/workshop that would have been prone to low temperatures in winter and Im wondering if this could have done some damage.
Anyways,its working fine now and I can only see in time if its completely resolved.
Thanks for all the input everyone.Very much appreciated.:)

blackcat4866
11-29-2011, 12:09 PM
Low temperatures can definitely be a cause for image quality problems. From moist paper, to mottling on the developing cylinder, to condensation on the optics & fuser guides & drum, to primary charge loss. Most of the time just moving the machine to an "office" environment is all that's necessary. But try to convince the customer of that! Now there's a challenge! You can quote from the spec sheet as per humidity & room temperature if it helps. =^..^=

dickierock
11-30-2011, 03:08 PM
I actually brought the machine to the workshop as this was in the back of my mind.It did seem to be improving for a bit but then reverted to the pcq issue.
Anyways,thanks for the input blackcat again.:o

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