bizhub PRO 950, gathering paper in the drum cleaning unit and beyond ...

[blackcat4866]

Re: bizhub PRO 950, gathering paper in the drum cleaning unit and beyond ...

What makes you think it is tray three rollers?

And all copiers in same building!
Sounds a lot like it's environmental to me.
Try the T/S unit on one of them and see if it helps.
Was it the same three from the original post?
If so, Better yet swap the unit from the one that did not do it with one that did and see if the problem goes with the T/S unit.

90% on the paper in these machines feeds from tray #3, except when some idiot re-programs the paper size to 8 1/2 x 11W. I could also swap with the one unaffected machine. Yes, one machine remains unaffected. Not a bad idea ...

Thanks MADORAM. =^..^=

[methogod]

Re: bizhub PRO 950, gathering paper in the drum cleaning unit and beyond ...

i would stop combining the issues into the same problem. We have 7 920s running, and we see this with higher meter machines.


You need to pull all the "pretty" covers, and ozone filters in back, make sure there is a good 12 inches of air between the back and the wall. In our case we removed some of the left side covers between engine and finisher (but we are in a print shop so no one cares how they look). You can do this as well but its not always needed.

Most of the time the drum claws are not being replaced as needed, and what happens is toner gets into the springs and they stick, i would check drum claw assembly replace claws and springs as needed.

Also i would jig the doors and watch till it happens, is the paper just riding up into the cleaner or is it flipping over (180 degrees), 1 issue would be claws other issue would be lower corona unit or adjustments.

what are the exact meters...

lets try and be specific, it helps us help you.

[blackcat4866]

Re: bizhub PRO 950, gathering paper in the drum cleaning unit and beyond ...

... You need to pull all the "pretty" covers, and ozone filters in back, make sure there is a good 12 inches of air between the back and the wall. In our case we removed some of the left side covers between engine and finisher (but we are in a print shop so no one cares how they look). You can do this as well but its not always needed.
....

In a high school? What are the benefits again? I mean other than looking like a car wreck?

These users cannot manage to install toner properly or choose the correct paper size. Do I trust them not to stick their fingers into a rotating fuser? No ... but it would be fun to watch.

... Most of the time the drum claws are not being replaced as needed, and what happens is toner gets into the springs and they stick, i would check drum claw assembly replace claws and springs as needed...

I have kept the claws replaced on schedule and the claw area get cleaned regularly.

... Also i would jig the doors and watch till it happens, is the paper just riding up into the cleaner or is it flipping over (180 degrees), 1 issue would be claws other issue would be lower corona unit or adjustments...

How much time do you have? The last event was 4 weeks ago, three machines the same day. Honestly I don't think I can justify spending the next month sitting in front of a 950 with the doors keyed.

... what are the exact meters...

lets try and be specific, it helps us help you.

750K to 956K. I really don't consider this to be higher count. I've heard of machines with 18M prints.
Honestly I appreciate that you're considering the problem, but so far I haven't heard anything useful or practical in the last bit. =^..^=

[methogod]

Re: bizhub PRO 950, gathering paper in the drum cleaning unit and beyond ...

Call a tech, why ask for help but then say you don't have time to test and fix.


Buy 24# paper from staples, should solve most of your issues.

[blackcat4866]

Re: bizhub PRO 950, gathering paper in the drum cleaning unit and beyond ...

Call a tech, why ask for help but then say you don't have time to test and fix.


Buy 24# paper from staples, should solve most of your issues.

Well aren't you funny.
I've 12 hours in on each of these machines. I was aiming for some productive time.
Three hours of staring at the bed of a machine that is not wrapping doesn't count as productive, but I've done it.
Again, thanks. =^..^=

[methogod]

Re: bizhub PRO 950, gathering paper in the drum cleaning unit and beyond ...

Sorry i can be more help. I have 7 920's running, usually only one does this at a time when its cold out side, low humidity.

would look to environmental if they all have the same issue.

[blackcat4866]

Re: bizhub PRO 950, gathering paper in the drum cleaning unit and beyond ...

Then it's down to the last resort. Charge up the cell, pull up a chair, and call the dreaded hotline.

ZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZzzzzzzzzzzzzzzzzzz zzzzzzzzzzzzzzzzzzzzzzzzzzzzzz.......zzzzzzzzzz... .............huh, what? yeah I'm still on the line. =^..^=

[JR2ALTA]

Re: bizhub PRO 950, gathering paper in the drum cleaning unit and beyond ...

Can you fashion some mylar? If not to solve problem at least it would be a customer clear till you figure it out.

[blackcat4866]

Re: bizhub PRO 950, gathering paper in the drum cleaning unit and beyond ...

Can you fashion some mylar? If not to solve problem at least it would be a customer clear till you figure it out.

Just out of curiosity where would this mylar reside? Perhaps in the drum claw area?
Any mylar that was not on edge would interfere with transfer and separation, so it can't be in the s/t unit.

A) I can hear my own words coming back to me: ... if the drum claws are necessary something else is wrong. The paper should never touch the drum claws if separation is working properly.

... except separation is entirely controlled by potential control. It takes me back the the s/t unit again.

Here's another extraneous theory: This customer incorrectly changes the paper size to wide paper 8 1/2 x 11W. Could the paper slight size difference throw off the drum claw solenoid timing? Again, see A)
It wouldn't be that hard to permanently keep the drum claws contacting the drum. There would be some additional drum wear, but it couldn't be worse than scouring the drum with paper in the cleaning unit. I think this will be my temporary measure.

I don't know ... just random thoughts. =^..^=

[CraigW]

Re: bizhub PRO 950, gathering paper in the drum cleaning unit and beyond ...

Are they using "sheet and cover insert" by chance ??

You mentioned the blue paper.

We have some 7155s & 7255s that will get paper into the recycle section quite often when using that application.

[blackcat4866]

Re: bizhub PRO 950, gathering paper in the drum cleaning unit and beyond ...

I suppose it's possible. I've got a new theory but don't know what to do about it.

The last couple occasions it has been the green colored paper in tray #2 ... and the enduser has erroneously selected 8 1/2 x 11W manual paper selection for that tray. Perhaps the difference in paper size changes the timing for the drum claws? This time the paper made it all the way to the developing unit, blocking the flow of developer over the mag roller. The copies were very light. And potential control seeing light patches, toned up the developer. Strange that you can get light prints from severely over-toned developer ...

As an experiment I'm "adjusted" the drum claw solenoid so that the drum claws always contact the drum. I know that will create additional wear at drum claw locations, but it can't be worse than scouring the entire surface of the drum with paper. We'll see if it makes a difference.

=^..^=

[methogod]

Re: bizhub PRO 950, gathering paper in the drum cleaning unit and beyond ...

usually when this happens the claws need new springs - or they are very dirty. if you already took care of that, i would replace lower corona. intermittent failure will cause curling.

ALSO MORE INFO ABOUT STOCK...

20# OR 24#? you try flipping the paper, one way or the other. We use alot of colored paper - pink mostly, sometimes there is a heavy curl, and if you load it the wrong way - it will snag here and there.

you don't want to use the 8.5x11W (wide setting), unless the paper is larger then then 8.5x11. Never messed with it, but never known anyone to use it.


Good luck....

[RRodgers]

Re: bizhub PRO 950, gathering paper in the drum cleaning unit and beyond ...

Every time I see this I always replace the T/S unit and that fixes it. It seems the meters are a tad low for it but you might have cracks in the plastic that is causing it to arc.
Just my $.02
HTH

[JR2ALTA]

Re: bizhub PRO 950, gathering paper in the drum cleaning unit and beyond ...

there's really no sense in posting if you're not going to read the whole thread.

The separation/transfer unit was replaced

[methogod]

Re: bizhub PRO 950, gathering paper in the drum cleaning unit and beyond ...

insight on these mid-light production black and white machines...

they have a mind of their own...

i have 7 920's running...

2 for some reason have a weak bias (T/S) weather its new or not.

no point trying to figure out what it is....


we just run our stock set at PINK or GREEN, darker colors get a higher charge- its in the service manual/theory.


if its white 20# getting stuck, run as color yellow, if its blue, run as the next color up that increase the T/S...

ill do some research.

usually its the high voltage unit but we have never replace just work around, but we are also a print shop not retail.