Had a similar problem with OfficeJet 6700:
Printer indicates a paper jam each time a page ist to be printed (copy, fax, print).[br]
After pressing the ‘ok’ button, one blank page ist transported through the printer in slow motion, then one page gets printed ok. For each subsequently printed page the procedure gets repeated…
I found that a real paper jam put ink onto the ‘page present sensor’, so the printer thinks the paper got lost on its way through the duplexer. For the 2nd try paper presence is not tested, so it works for one page.
SOLUTION: Open front door to access print head. Unplug printer after head moved itself to center.[br]
At the bottom of the right side of the print head there’s a small square unit with a tiny ribbon cable. Gently lift up the head and carefully clean the bottom of this sensor unit. [br]
Reconnect power and switch on printer (head should be out of parking position for as short as possible!)
Good luck!