Will not function on front feed

Error says paper jam, but there is not. What could cause this ...

https://www.ifixit.com/.../Error+says+paper+jam,+but+there+is+not...
iFixitThere is no paper jammed anywhere! each time I would finish with the steps and ... I have to turn off and turn on the printer to get it going again. ... and the grinding sound and the paper jam message still comes up. i am going to try .... well no luck Iremoved ink and they are not dry - new- and now it says paper jam and not so ...

Fixing Brother Printer "Paper Jam" Error with No ... - YouTube

? 1:54
https://www.youtube.com/watch?v=SqWNFVIR6JA
May 30, 2014 - Uploaded by Refresh Cartridges
Fixing Brother Printer "Paper Jam" Error with No Paper Jammed.... problem occurred again. i try this many times but the problem is still in there. ... There was paper jam front rear on my brother j450dw that wasn't going away, that was ... How to remove jammed paper HP LaserJet Professional P1102 Printer ...

How to fix a printer paper jam. - Computer Hope

This is a sample guide;

Well I fixed it!!! Here's what I did. You see this picture of the cover opened? Where the arrow's pointing is the home position of the printer head. Under there I found a scrap piece of paper! Here's exactly what I did. When I got home I decided to plug it in to see if it would work, but it made the same noise and showed the same error message as before. I opened the cover as shown above. This resets it, and it says "close cover". I closed it, and AS it started to go through its routine I OPENED IT again, and I could see the printer head moving back and forth. At this point I used a flashlight to see where the home position of the Head was, and that's where I found the scrap of paper!
I unplugged it for safety and was able to remove the scrap with my fingers.
By your descriptions, referring to the other users, you just might have the same problem.

Hope this may help;

Regards,
VOTIT

how to video

Hello Tessty,

The Paper Jam message may appear on the display if the Brother machine is not feeding paper correctly, paper scraps stucked or the paper is not loaded properly in the paper tray, the jam clear cover located in the back of the machine, is not installed properly or the PE Actuator is missing or damaged.

Please visit the link provided below to resolve the issue step by step :

http://welcome.solutions.brother.com/BSC/public/us/ca/en/faq/faq/000000/000400/000095/faq000495_027.html?reg=us&c=ca&lang=en&prod=mfc240c_all&Cat=113

Please remove your printer from the PC and uninstall the printer software. Now reinstall the printer driver software and connect the Printer to be detected and installed. Check printer properties to see the ink levels.
If the printer shows a jamming error then check the input of the paper feed as there can be some foreign objects that is obstructing the detector opto-coupler or the detect switch. clean and check or the sensor is faulty.

paper jam on hp laserjet

Use mirror and flashlight to look down paper feeder from the rear, gently pull paper toward the rear. An index card can be fed from the front to the rear to push paper out by turning the gears you see on the left side inside the front cover. Be careful not to force anything.

If you did not get ALL the jammed sheet out, there is still a small piece of paper in there somewhere, probably covering a sensor or micro switch. Get a torch and look carefully. If you don't find anything you may need to disassemble the printer to find it.

Fiend your solution direct from EPSON. Here is your solution...

http://www.epson.com/printer/prob676ijt65/solution

takiqq14

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.

document.tlSearch.tx.value=unescape("")
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.