PDA

View Full Version : Biz 224 marks


Custom Search


copyman
04-25-2018, 10:39 PM
I'm getting these black marks on the page (see sample). Happening every color & b&w pages. Replaced transfer belt and didn't help. Don't see any marks on any drums. All drum are over life so I'm going to start with replacing the K drum.

I guess this might answer my question, if you roll the paper up and put the repeat defect on top of next defect it looks to be the size of the drum, does this always mean it is one of the drums? My thought is even though I don't see the mark on drum when out of machine it only does it when operating.

What's throwing me off is I ran single color test sheets in service mode and every color had the marks, does the black drum & developer units turn even when doing a single test page of another color?

Wanted to add, secondary transfer roller looks good. Also like I posted the space between marks are about the size of drum which is larger than trans roll. So I ruled that out.

guitar9199
04-25-2018, 10:57 PM
If you replaced the ITB assembly, that should take the belt and drive rollers out of the equation. Check the developer roller for any marks or foreign matter... also, have you checked the transfer roller for debris?

But yeah...don't let that drum go too much over its rated life...bad things happen to the 4 series if you get a drum that starts arcing.

blackcat4866
04-26-2018, 01:05 AM
That looks like a knife scar to me ... in the fuser belt or pressure roller. What is the interval in mm?

Yes, on single color prints all developing units and drums rotate, so a fault on any of the drums will appear on every single color print, but ... the anomaly will stay the color of the drum. So if the scratch is on the cyan drum, you'll get a cyan scratch on yellow, magenta, cyan, and black single color prints.
I don't think that your enduser can get to the drum (to damage it) without removing the unit.

It sure would be nice if Konica Minolta put a repetitive defect ruler in their manuals, like Lexmark, Kyocera, Toshiba, Brother, Kip, and most other manufacturers. =^..^=

Woxner
04-26-2018, 01:05 AM
100% its the drum

copier tech
04-26-2018, 08:14 AM
If you want to be 100% sure it is caused by the K drum, you can swap it with another colour, say yellow, all you need to do is swap the chip over from one drum to the other (chip is on underside front of drum 1x tiny black screw) If the black make changed to yellow its the drum & fault if you still get the mark its not the drum.

copyman
04-26-2018, 12:55 PM
Thanks for the replies. Going back with new K drum & dev unit. Will post after what it was.

CraigW
04-26-2018, 04:58 PM
4 series drum repetitive = 95mm.

copyman
05-01-2018, 12:18 AM
Turned out to be the black drum as suspected. Really weird the drum had no marks on it. Going to take apart and probably find a small piece of paper stuck in cleaning blade, etc.

Custom Search