Konica 7272 dropping developer

[copyplus]

Sorry, I try to scan but the scanner did not pick up the background. It is like a grey dust in the background which gets darker. When turn off the machine and start next day it starts printing ok but after some copies it starts printing grey dust in the background. Maybe I will change the drum and cleaning blade next week and see if it improves. I am really grateful for your kind help.

[copyplus]

Thanks methogod. I changed the drum and cleaning blade and new developer. All the problems are solved. No dropping toner, and grey backgrounds. Thanks a lot.

[methogod]

no problem...

IF you know a dealer who will sell at cost i need parts - having some trouble getting KM items at cost.

Especially items for my C451

[copyplus]

Re: Konica 7272 dropping developer

I am back again with the same problem of toner dropping in my KM 5510. The toner drops on the bottom grid especially more on the back side than front side. At 65000 I changed the drum, developer and cleaning blade and the problem was solved. Now at 104,000 I have the same problem. I changed the cleaning blade and the problem still exists. I also cleaned the filter. What is service cycle of these machines. Do I need to change the drum and developer again? Or there is any other solution to this problem. This is the worst copier I have seen my life.

[methogod]

Re: Konica 7272 dropping developer

We had the same issue, try some conductive grease on the back of the drum, where the drum makes metal contact to the rear of the machine. It didnt take much but we had this issue for a while, tried alot to fix it. Other time it was just consumables or other issues with parts.

What is the meter count?
What is the PM count? Drum Count Dv count?

What stock are they printing on? are they printing volume.

The 7255 or your version of it, has some known limitation, its not meant to be a production machine, the heat will cause other failures.

What is the count on the DV unit?

Are you using OEM everything? Toner? Drum? Etc...

Have you gone though the adjustments, HV adjustments, Drum Perc, etc.

call me if you want to go over this step by step you have to eliminate the most common issues first.

[copyplus]

Re: Konica 7272 dropping developer

Thanks Methogod
I applied grease on the drum and it is much better now. Appreciate your help.

[methogod]

Re: Konica 7272 dropping developer

---

Glade you found the issue, becuae trust me that is a shot is the dark. Had a machine down in my product enviroment for month with this issue.


honestly if hate the developer issue its time to move to a 750/920/950, depending on your needs. The older models drop developer, the newer ones do not have nearly the same number of issues.


thanks,

[MBMCO]

Re: Konica 7272 dropping developer

Just throwing my 2 cents into the hat.

Have a C364.

Round 1: In one day all 3 color drums dropped their life count to 0. Customer never called and said the warning display had popped up which WAS turned on to display. The drums were done. Locked up the machine so it couldn't print because they were out of their life (BTW there is a way to bypass that only for experienced techs). Replaced all 3 drums. Made test prints. Color copies were light shaded and streaked for Magenta and Cyan. All copies had 2 large colored streaks on prints. See attachment.

Round 2: Magenta and Cyan Developers were splotched. Bare random spots on roller. Thought the developer wasn't charging well (both?). Adjusted BIAS VOLTAGES around a bit without success. Figured out there was about half as much developer in the units than there should be. Went looking for the developer. Waste toner bottle was at least 50% developer. Put a magnet inside and it was covered. Dumped it into a bag and tested it through the bag and was shocked at how much developer was in the bag. Magenta and Cyan were dumping developer.

Round 3. Large Streaks. Transfer belt cleaning blade and toner auger shell was PACKED full of toner and developer also. Packed so full it was leaking out of the edges causing the streaks. Removed that from transfer belt and cleaned it out. Cleaned up the streaks.

Round 4: Good drums, clean transfer belt, clean copies still Magenta and Cyan problem. Justifying 2 color developer units to my employer on a copier that only had 88k color copies run through it was a tough sell (500.00 ea). Developer powder only sold separately aftermarket.

Big question though is why did 3 drums go at once, transfer belt get so plugged up and 2 developer units lose so much all in one shot? Traced all down to the developer units dropping developer and passing it throughout the system.

Hence all of this was the vicious circle of a day of a C364.

Transfer belt dumping toner out the sides, toner covered rear inside of machine, bunged up developer unit contacts, developer units not charging well, developer not adhering to roller well and passing onto drums and transfer belt, plugging them up further causing more spillage and so on and so on.

As it sits now we are cheaping out and going to try and fill the developers back up to normal level. Figure if we destroy them with aftermarket stuff no big deal we may have to buy new ones anyway. Everything else is working great for now. Will update after it has all been running a bit.

That's my story. I hope this helps out someone because it drive me into madness.

[MBMCO]

Re: Konica 7272 dropping developer

UPDATE:

I replaced the developer powder in both units which worked great. The reason for the developer dumping is still a mystery at this time but I am monitoring it to see if the developers themselves are bad or if the new powder will take care of the issue.

Either way customer is happy and all is well with that unit. Save my employer 800.00 too so he is somewhat happy although I doubt I hear anymore about that savings.