I have a HP LaserJet 1312nfi that is giving me a FALSE paper jam message. I repeat - FALSE PAPER JAM IN BACK DOOR. False false false. I have uninstalled it on my computer and nothing. I have opened it up completely and blown it out with a can of air, nothing. It's a FALSE message.

First step is to unplug your printer, leave it unplugged for 30 seconds and then plug it back in.

Here's a video Harshit kumar suggested as a solution to your problem from YouTube:


Fixing a Paper Jam - HP LaserJet 1020 Printer

try lubricate the paper lefter from down the printer - you must lubricate the two sides

Go to HP Support at -> HP Support & Drivers 1

This error message is displayed by the printer when paper is jammed in one or more locations. In such a case, users are recommended to remove the jammed paper from the specified location. The entire paper path must be checked for any pieces of paper. To stop the message, open and close the top most cover of the printer. Lastly, verify the flags and the sensors. If the problem persists, the cause of the error message could be a broken sensor or sensor lever.

Hello,
Where was the paper jamming at? On this model printer there are several things that could cause a jam or false jam. You paper pickup roller or sensor could be be bad, The fuser could be bad and prevent the paper from pulling thru or one of the paper ath sensors could be failing giving a false trigger. If you would like to call us at 318-769-9040 we would be glad to help you.

Corporate Computer
www.ccl-la.com

paper jam inside HP Color Laserjet CM1312 MFP, not related to paper tray and is deep inside where it cannot be pulled out

it will depend if it is a false paper jam, it would be better if you would call HP.
if not, you can take out the paper at back, there will be a rear door access.
hope it works..

HP LaserJet 4, 4m, 4 Plus and 4m Plus Series Printers - False Error Message 13 PAPER JAM ISSUE: After clearing all jammed paper from the HP LaserJet 4, 4m, 4 Plus, or 4m Plus series printer, the display still reads 13 Paper Jam . Even after cycling the power off and then back on, the error remains. SOLUTION: Open the rear door of the printer. There is a paper sensor near the upper right hand corner of the fusing assembly (just below the right edge of the long yellow warning sticker on the fuser) that can cause paper jam error messages even when there is no jammed paper in the printer. Toggle the thin black plastic lever up and down to make sure it is not stuck or sticky. The lever should be in the down position before closing the back of the printer. If the lever is stuck or missing, the printer will generate a false paper jam message. Hope it will help you !

Try this linke below.
http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?lang=en&cc=us&taskId=110&prodSeriesId=411171&prodTypeId=18972&prodSeriesId=411171&objectID=c00642524

Or i cut and paste text, but you should view pictures. If you cannot get to it from link. Try typing "Paper jams alternating between front and back door" It should be first link from HP about a 3550.

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HP Color LaserJet 3500, 3550, and 3700 Series Printers - Paper Jams Alternating Between Front and Back Door Issue Description Customers may see paper jams error messages with no paper seen in the paper path. The message will alternate between check the front door and the back door. Workaround The release lever engagement tabs on the rear door can be bumped into the in-correct position. The purpose for this tab is to re-engage the fuser release levers as the rear door is closed. When one or both of these are left in the in-correct position the printer goes into a cycle of alternating between a "Jam in the Front Door" message and "Jam in the Rear Door" message. There is no paper present in the paper path when this happens. When a customer gets the "Jam in the Front Door" message and opens the front door, no paper is found. After the customer closes the front door, they get the "Jam in the Rear Door" message. When they open the rear door, find not paper (even pull out the fuser), and close the rear door, they get the "Jam in the Front Door" message. This cycle will continue

Placing both engagement tabs in the "Correct" position solves the problem and allows the print job to continue.for as long as the customer is willing to keep checking.