paper jam error message - HP Officejet 8500 pro - please help, deployed no return option

[pbug56]

HP did seem to learn some lessons from the really awful 8500's; the 8600 series seems much better mechanically.  Though it does have this bad habit of going offline once in a while, especially after handling faxes. 

[dockit1]

I have two HP 8500 printinters given to me by customers with constant paper jam messages.  I have solved the mystery for the 2 printers I now own.  Please review my Youtube video and you will see where to look for the broken gear.

Just Google  "HP OfficeJet Pro 8500 Paper Jam Mystery Solved" and view the YouTube Link

Parts to repair these printers are unavailable from 3rd party parts distributors I contacted.

If anyone finds these parts available from HP or elsewhere, please leave me a message.

I will be happy to upload a video of the repair if I can get replacement gears.

[234317]

Paper Jam error when there is no paper jam.

{Personal Information Removed}

[Rudy1906 · Accepted solution]

Here is a link that will assist you.
http://goo.gl/vxhuH

It may be a sensor that has gone bad within the printer that's causing the message.

[Jehoor]

Some WD40 and a touch of a screwdriver and it is printing fine again! THANX!

[PONTIAC1967]

Its the little white gear if gets cracked it spins over the pin. Line it up on the pin bingo it works again.  Good advise would never figured it out.  I like this printer so it was a shame to throw out.  Good luck to all if problem is not the gear.

Cheers

[PONTIAC1967]

lube does help the cluch mech. but if the gear is not set in the pin on the shaft it will not work.

[pbug56]

It was a bad design that they eventually discontinued, but lots of people got stuck with it.  The next model has a neat problem of its own; after doing faxes it tends to take itself off line and needs to be power cycled.

[PONTIAC1967]

Pictures for people who want to know what to look for.

[PONTIAC1967]

note it is broken but back on the torq srcew holding it in place. ill let everyone know how long it last back in position. So far 20 pages and counting.

cheers