Konica 7272 dropping developer

[methogod]

just a line about .5 inch or less across the top of regular 8.5x11 paper (LEF). Changed DV units, changed PM units, adjusted voltage...

Still will run clean for 3000-5000 copies then it appears, looks like a buildup of toner on the grid, once clean, will again run 3K-5K clean.

I am swapping charge units off another machine today, ill post if that fixes, but I am at a loss, machine has total of 780K, its all printing no copies.

Aways prints from LCT, face up. Rollers are new, PM is new, drum is new.

Any ideas...

[TonerMonkey]

This is an old old problem which hasn't really been resolved by KM, I think it's because of recirculating toner but all sorts of workarounds have been tried to sort it like inserting conductor between the dev bias contact and mag roller, changing mag angle, restatrting machine and cleaning all toner out of process section etc etc but without much success.

Maybe someone else has had more success but as far as I know it's one of those problems that doesn't affect every machine nor has a definite solution.

[methogod]

yes...

Like I said, I have does all this, didnt change the mag angle or anything but i have 6 other 7272/7255 and never had this issue.

[TonerMonkey]

ok ......

get the message although I thought you might like the benefit of someone having worked on hundreds of 7272's and not being able to find a solution but when you find out what it is be sure to let KM know because they don't seem to have a solution for it either.

If you're having trouble with this issue then keep your head up if you don't find a fix for it is the point I'm trying to make.

[RRodgers]

One thing to do is be sure to vac out the ducting for the dev unit. (fan on the right side of the machine has a filter, vac that out)

[copycommerce]

Check the drum and be sure to use original toner(the Katun one fucks up the inner parts of the dev box).I was having the same problem with Bizhub600,after replacing the drum and the developer the things went to normal.

[methogod]

Great HELP...

My copier guy is great, so i'm sure between your suggestions and some bearings he suggested we will figure it out.

Worst case it becomes a parts machine, and I get a new 1050e or 920.


thanks,

[methogod]

I have the solution, turns out the drum bearings were ARKing out, a bit of conductive grease and a proper cleanign did the trick.

Ordered all 4 bearings and the drum shaft, will post if it comes back....

[907tec]

Hey Methogod, what kind of conductive grease are you using? I've been looking around for something similar, but have come up completely empty. Plenty of thin, spray-on contact cleaners or dielectrics, but no real conductive grease. I'm guessing it's some sort of thick graphite-type grease that you can pack into the bearing raceways?

[copyplus]

Konica Minolta Dialta 5510

I am also having the toner/developer dropping problem. Also when the page is printed it comes out grey (the whole paper is greyed out, like a grey background). Any solution? Pl note that I have already poured new developer in the unit and using original toner and developer. Cleaned in and around the developer unit and grids.

[methogod]

GREY PAGES, sounds like main charge, i would replace the charge wires first. If they have more then 1 machines, i would swap parts before spending money on a full PM kit. IF that doesnt do it, I would look for some shorts. I have seen conductive gresses fix a bunch of odd issues like this. If there is dev at the top of bottom of each page - THEN ITS A CHARGE GRID ISSUE.

NEED MORE INFO ON METER AND COUNT OF MAJOR SUPPLIES.

[copyplus]

The machine has only 59000 copies on its counter. The developer is just changed. Cleaned all the grids and they seem to be ok. the grey backgound prints on the whole page not a particular area. They start from about 5% grey to 50% with number of copies printed. Suppose I start printing the first copy comes out clean and then after making 10 copies it starts 5% grey and then at 200 copies it is 50% grey and so on....

[methogod]

can you email me a scan of the 1, 50th and the 200th.

cant really tell if you have a image being produced or not. If its jsut grey, no image, it has to be somthing with the charge/transfer units.

[copyplus]

I don't know if you will be able to see the scanned copy. The text and graphics printed are ok. Just grey background (like a dirty print). I can email you the copies - what is your email address.

[methogod]

m-scudder@comcast.net