HP 4000 Jamming before picking up paper

We have an HP Laserjet 4000 in our office that has started giving paperjam messages every so often. Ive replaced all the rollers, but it still does it. Ive checked the paperpath and nothing is stuck or anything. So, theres no paper going through the system. It just doesnt pick up the paper and reports it as paperjam.
Today it printer over 200 test pages before it jammed, but after it did it once it happens again fairly quickly.
gochiefsAsked:
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nobusConnect With a Mentor Commented:
to me it seems a broken tooth of a gear - inspect and replace them
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michkoCommented:
Make sure you've checked and cleared out all the possible areas.  One little piece in the right spot, and you've got another paper jam.  Here is a link from HP on clearing out paper jams:
http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?lang=en&cc=us&taskId=110&prodSeriesId=25474&prodTypeId=18972&prodSeriesId=25474&objectID=bpl07007

If the first page printed causes a 13.5 paper jam error, this support document from hp may help:
http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?lang=en&cc=us&taskId=110&prodSeriesId=25474&prodTypeId=18972&prodSeriesId=25474&objectID=bpl03837

Are you sure you replaced all the rollers?  In the tray and in the pickup drive assembly?  It really sounds as if the pickup drive assembly roller is still not picking up properly.
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gochiefsAuthor Commented:
Yep, for sure those were replaced. All 4 D shaped rollers, the one roller in the tray, and the one round roller next to the D shaped ones. Since it did make it through over 200 pages first, could there be anything that would cause it once it gets warmed up?
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gochiefsAuthor Commented:
BTW, this is only from the bottom paper tray, if we use the manual feed than there is no problems at all.
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michkoCommented:
Pick your specific model from this link:
 http://h20141.www2.hp.com/hpparts/Search_Multi_Product.asp?mscssid=D0S3ND8FSU2T8GTL7NLDK4L4KFT129X1&SearchCriteria=LASERJET~4000

View product diagram for Paper Pickup Drive Assembly.  This shows the pickup assembly and how it breaks down. See if you can find anything that doesn't look right (I know, vague, look for chipped gears, etc).  

Also look at the 500 Sheet Feeder parts list.  You may need to replace the pickup drive assembly.

Since it won't pickup the paper to begin with, this is where you problem most likely lies.
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gochiefsAuthor Commented:
After watching it from the back of the printer. I can see the paper getting moved forward, but then it moves back, than forward again, then give the jam. Kinda like it went forward, thought there was something in the way, then moved back. Started again and then jammed.
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gochiefsAuthor Commented:
Also, to clear this "paper jam" all i have to do is open and close the doors and it will pick up the next peice, but then jam again.
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gochiefsAuthor Commented:
Ok, so, the manual feed works with no problems, and, when i lower the rear paper exit, i didnt seem to get a jam then either. Will run another test of 50 to confirm though.
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Michaelsoft73Commented:
Sounds stupid, but have you changed where you store your paper?  4000's are a bit twitchy with paper thats slightly damp.
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gochiefsAuthor Commented:
Nope, nothing has changed with anything. Just decided to start jamming.
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Engineer_JOCommented:
I think there is a problem inside the pick up device.
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