Kip 7100 background on print and copy images

[blackcat4866]

... primarily at the left end of the device. In the investigating that I did, I noticed that there was a dusting of toner on the left end of the drum, that wiped off easily with a stretch-N-dust. There does not appear to be any kind of drum cleaning blade or lower cleaning seal, but it does have a foamy cleaning roller, which seems to be making good contact with the drum. The drum has no visible flaws, and appears to be in perfect condition. There did not appear to be any bias voltage applied to the cleaning roller. The cleaning roller is my first potential candidate.

There was no toner dusting anywhere else in the machine. The paper path was clean, front of the developing unit clean, primary charge immaculately clean. There is a broken aligning post on the left main charge block, but it does not appear to affect the way the primary charge fits against the drum. Still, I think perhaps if the primary charge were not close enough to the drum, perhaps diminished primary charge might account for the toner left on the drum.

There were two places to secure the developing unit to the frame, but I think they're just for shipping, so as not to have the developing unit jostling around in the back of the delivery truck. There appears to be a developer shift system a lot like the analog Canon's had, way back.

Let's see, what else? It's got 36000 ft2. Am I working my way in the right direction, or did I miss a fork in the road? =^..^=

[hidius]

Re: Kip 7100 background on print and copy images

maybe try cleaning the print heads ?

[allan]

Re: Kip 7100 background on print and copy images

maybe try cleaning the print heads ?

That would cause faint prints.


The one thing i can think of is that the bias/charge voltage is slightly inadequate. I have seen some rollers working like a resistor causing a potential difference from the one end to the other. My only experience on this kind of machine is on Oce TDS machines. Should be very similar.

Does that machines meter work on square feet? That relates to 57142 A4 or 55581 letter pages anywhere on the drum surface. That is working with 36 inch paper.
So the drum should be good.

[jdzr]

Re: Kip 7100 background on print and copy images

Make sure you clean the developer rollers really good. KIP has a scheduled & a process set up for cleaning these rollers. I'm not exactly sure what it is but I know it is quite often, more often then you would expect.

[blackcat4866]

Re: Kip 7100 background on print and copy images

maybe try cleaning the print heads ?

I did clean the LED print heads, but my presumption was that I would get light areas or voids if the lens was contaminated. Correct?

That would cause faint prints.


The one thing i can think of is that the bias/charge voltage is slightly inadequate. I have seen some rollers working like a resistor causing a potential difference from the one end to the other. My only experience on this kind of machine is on Oce TDS machines. Should be very similar.

Does that machines meter work on square feet? That relates to 57142 A4 or 55581 letter pages anywhere on the drum surface. That is working with 36 inch paper.
So the drum should be good.

It does measure usage in square feet, based on 36" roll media. It seems like a very simple laser printer process with LED exposure.

Make sure you clean the developer rollers really good. KIP has a scheduled & a process set up for cleaning these rollers. I'm not exactly sure what it is but I know it is quite often, more often then you would expect.

I was not aware of a developer roller cleaning process. I'll look into it. Does this MFP use monocomponent developing? That would certainly simplify cleaning the developing unit. Is there some sort of driver for the developing unit? I couldn't budge it by hand. =^..^=

EDIT: So I suspect a little more.
I've ruled out the primary charge and developing spacers as a cause.
I have three possible leads to follow based on my reading on the toner collection process after each page:
1) Dirty drum cleaning lamps (I didn't particularly notice them on the first visit).
2) Poor electrical contact at the drum cleaning roller (somewhat doubtful since the right side, blocks B & C, seem to clean adequately and the charge contact connects at the right),
3) Electrical defect in the drum cleaning roller itself.

There is a developing drive handle, which will make the developing unit a little easier to turn. I don't see any reference to developer, developer stir, or toner density, so I'm going to assume that the 7100 is monocomponent developing.

Perhaps the broken pin on the primary charge block is important. Maybe the charge unit shifts across the cleaning lamps, blocking the LED light at the far left. I think that's my best theory so far.

Samples:

Kip 7100 image quality issue1.JPGKip 7100 image quality issue2.JPG

I must have missed the cleaning lamps:

Kip 7100 drum cleaning lamps.JPG

=^..^=

[blackcat4866]

Re: Kip 7100 background on print and copy images

It seems to be fixed.
I replaced the cleaning roller and broken corona block. I lubricated the bias connection to the cleaning roller with conductive grease. The cleaning lamps were perfectly clean. =^..^=