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HP 2840 Jam in Print Paper Path

I have had this unit for 4 years without any problems. I just moved my office, and while I handled the HP with care I am getting a "Jam in Print Paper Path" message.

I have removed and cleaned everything that comes out - the drum, all toner cartridges, rear removable fuser unit, paper tray. I used a can of air and gave it a good once over with a vacuum. No sign of any paper, foriegn object, nothing.

My thought on this is possible toner dust on the sensor's. Please help I'm out of ideas and I dont know where the sensors are.

Thank you in advance,

Joe B

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  • pkilchrist Jan 10, 2009

    I have the exact the exact same problem and the message code will not clear.

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There are 2 primary paper sensors. One is the registration sensor where the paper feeds in, the second is associated with the fuser unit.

The first sensor is located under a cover under the transfer unit.
i) Open the door
ii) Lift out the transfer unit (Q3964A)
iii) Locate the black plastic cover plate with a small green flap in the centre. This assembly is directly under where the transfer unit was installed.
iv) There are 2 shiny screws that secure this cover plate. Carefully remove these screws.
v) Lift out the black cover plate by lifting the left section up first which allows the right section to come clear of gears.
vi) Check for paper obstructing the small movable lever under the cover plate.

vii) To reinstall the cover plate, insert the right hand side down first and line up with the mounting holes.

I can supply photos if required.

Posted on Sep 12, 2009

  • Stephen Lea Mar 03, 2012

    You are a star! I didn't know about that... and the moment I lifted the cover plate, there was my problem, a piece of wire under the cover plate. It didn't work first time when I reassembled, because I didn't get the cover plate back quite tight - but once I saw to that, off we went. Very many thanks.

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Dear Sir; You do a very good cleaning job, but you didn't use right thing to clean right place; you have to buy a can "rubber rejuvenator" (stationary store) to clean paper pick up ,feed, deliver rollers, now you still have paper jam message,you may check the paper sensor it located where the paper stop, make the sensor freely.

Posted on Jan 10, 2009

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Change the pick roller first if still a problem the tray spring tension may need to be adjust put moore tension on the spring i seen it a lot

Posted on Jun 30, 2009

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