[CQ] KMBH C6500 Registration off front to back on 12X18 100# gloss paper

[Desert Rat]

I have seen this on the C500 and scrubbing the paper path rollers took care of it.
Not so on this model.
I started with the restart timing adjustment, checked the FD & CD mag adjust. The
FD mag adjust measured ok. I noticed .5mm skew while doing the CD mag and
went to the loop adjust to correct. No good. I adjusted from -30 to -20 to -10.
Then to -60 just to see movement. Nothing moved.
The customers copy shows about a 3mm error front to back of the machine and left
to right.

I could use some help and guidence on this model.
Am I on the right track? Or should I start with 11X17 inch paper
for these adjustments?

Thanks

DR

[minimerlin]

I assume that you have a skew on the paper? There is a chance that the pre transfer transport guide is bent, it is made of soft metal and is easily bent causing the transport rollers not to meet correctly and hence induce a skew!

[Desert Rat]

Minimerlin,
Thank you for your suggestion. I looked that up in the parts manual and on page 44 it shows
the secondary transfer section. Item 15 is the transfer guide and item 11 is the upper guide
plate assy. Is this what you are referring to?
I know on the C500 the entrance guide plate on the right under the by pass feed rollers will get
bent up a little and cause a similar problem.
Does it just need to be pushed down? Is it that to easy?

Thanks again

DR

[minimerlin]

Hi DR!
Not sure which manual you are looking at, just dug out my works laptop and my CF5501/6501 Parts manual shows the guide as Page 83, item 13 as part of the duplex unit. The tech manual (Theory of operaton) has a better picture on page 78.(16.1) The left hand picture is of the plate, the two white rollers can get lifted fronm the lower roller if the plate is bent, I have had skews result from this. Sorry cannot seem to cut and paste as I am on two different laptops..online on my own and looking at works for info! Hope it is of help..

[Desert Rat]

Minimerlin,
I was looking in the parts manual for the C6500. I will have a look in the theory guide to see
if I can find a better picture.

Thanks I will let you know how I fair tomorrow. That will be my second visit for this problem.

Thanks

DR

[bigdcopy]

Is it tray 4, 5 or tray 1, 2, 3? Do the adjustments with 11x17 not 12x18 you will fight it. If it is tray 4 and 5 there is an inclanation sensor (centering sensor) just prior to the exit roller of the paper feed unit clean it (you can remove one screw on the plastic cover and lift it up far enough to remove the sensor to clean it) it is the same type of sensor that is on the 1050's for auto centering. If you are trying to center tray 4 and 5 turn off auto center in the DSW manually center the tray then turn auto center back on. Trays 1, 2, 3 do not have an auto center sensor. If it is the lead to trail that is shifting remove the 2nd feed assy and clean the rollers and plates.

[Desert Rat]

Bigdcopy,
Thanks for that post. She does not have trays 4 & 5 yet and is running mostly from trays 1 & 3.
The skew and the shift is fairly consistant it does not seem to jump around.
It puts the image in the same spot for each copy, the cut lines don't line up on the full bleed
for a 2 sided print. It is off by about 3mm up & dn & left & right.
The second feed assembly? Would that be for the vertical transport? So far I have only
been running out of the top tray. I have a few sheets of lighter weight 11X17 gloss stock.
Would that be good for testing? Otherwise I will have to stop and get paper.

Thanks

DR

[bigdcopy]

the 2nd feed assy has a skew adjustment on it. Any 11x17 will work as long as it is not card stock the 2nd feed assy is the unit just before the transfer roller which is just before the fuser. I am on the road all day so can only answer at night.

[Desert Rat]

Bigdcopy,
I am on the road all day to if lucky. I may not get to see this machine for a day or two. The customer
has to get a job out and is trying to deal with the registration as she cuts the job.
Meanwhile I will look closer through the books I have.

Thanks for the tips


DR

[copiersales]

Re: KMBH C6500 Registration off front to back on 12X18 100# gloss paper

[QUOTE=Desert Rat;214399]Bigdcopy,
I am on the road all day to if lucky. I may not get to see this machine for a day or two. The customer
has to get a job out and is trying to deal with the registration as she cuts the job.
Meanwhile I will look closer through the books I have.

Thanks for the tips

Did the suggestion work for he front ot back registration?

[copiersales]

Re: KMBH C6500 Registration off front to back on 12X18 100# gloss paper

Did the suggestion work? Is the skewing a known problem with the KM box, or is it a function of poor service?

[Desert Rat]

Re: KMBH C6500 Registration off front to back on 12X18 100# gloss paper

Copiersales,
Yes it did seem to help, I am not real familar with this product and as an indy I have to
train myself on all the equipment I work on. So if I have trouble it is usually due to
not enough experience on a particular model, not poor service.

DR

[copiersales]

Re: KMBH C6500 Registration off front to back on 12X18 100# gloss paper

My techs tell me its not unusual to have a skewing variance of 2mm and a front to back variance of 2mm on the C6500 during a printing run. Having sold digital copiers since 1990, I'm starting to realize these are not mechanical analog presses, they are digital presses. Which means you are working with electricity and circuit boards. My talk track to the customer will change in the front to back registration explanation, because its not an offset press. Also, they are settings which are user oriented and can be easily applied by the customer. I've learned they are some tech that can fix machines, but not customers and then they are tech who can fix customers but not machines. In this new digital press world, techs must be able to do both.

[Ianizer]

Re: KMBH C6500 Registration off front to back on 12X18 100# gloss paper

My techs tell me its not unusual to have a skewing variance of 2mm and a front to back variance of 2mm on the C6500 during a printing run. Having sold digital copiers since 1990, I'm starting to realize these are not mechanical analog presses, they are digital presses.

Desert Rat, I hope that perhaps it is not Copiersales who is suffering from poor service practices!
Forgive me, but reliance on K-M's tollerance of 2mm for skew may be a bit of a cop-out.
We have been able to achieve fairly reasonable registration with this box. And having serviced copiers since well before 1990, I beg to differ that these are digital presses...

I have seen this on the C500 and scrubbing the paper path rollers took care of it.
Not so on this model.
I started with the restart timing adjustment, checked the FD & CD mag adjust. The
FD mag adjust measured ok. I noticed .5mm skew while doing the CD mag and
went to the loop adjust to correct. No good. I adjusted from -30 to -20 to -10.
Then to -60 just to see movement. Nothing moved.
The customers copy shows about a 3mm error front to back of the machine and left
to right.

I could use some help and guidence on this model.
Am I on the right track? Or should I start with 11X17 inch paper
for these adjustments?

Thanks

DR

[copiersales]

Re: KMBH C6500 Registration off front to back on 12X18 100# gloss paper

Desert Rat, I hope that perhaps it is not Copiersales who is suffering from poor service practices!
Forgive me, but reliance on K-M's tollerance of 2mm for skew may be a bit of a cop-out.
We have been able to achieve fairly reasonable registration with this box. And having serviced

I, are you saying front to back registration is achievable on the C6500 and can be maintained throughout the run on 150gsm stock? If this is true, I'm going to start a fire.