Continuous paper jam problem, seems that the paper sensors are dislodged or misaligned, how do i realign them, printer is Brother MFC-9420CN

you might try this video

Hi


This error has already been noticed by Brother and they have a fix for this issue. This message will appear on your Brother machine if the ground clip is not present on the Transfer Roller Assembly. The clip can become dislodged due to a paper jam or removal of the Transfer Roller assembly.

To check the fix from Brother visit this link--

Brother TR Roller Install error removal Pictures

Please get back to me if you have any queries.

Daniel Scott

mrbarbazza, I feel your pain. I have had a Brother MFC-9420CN for just under 4 years now and for the past 4 months or so, I have been randomly getting the "Paper Jam A1" error. It is particularly annoying when printing or copying a multiple page document and the error occurs on page 3, for example. I pull out the paper tray only to find a perfectly good, undamaged piece of paper that has been half (or less) fed out of the tray which comes out with the tray; it is not even stuck in the printer. I put it back in place in the tray, reinsert the tray into the printer, wait for the printer to go through all kinds of gyrations after which I either have to start the entire print job all over again, or the printer does it on its own. Very rarely will it pick up where it left off. The really frustrating part is, during this next printing, it will get to maybe page 7 out of 10 and the same thing happens. I go through the whole process as does the machine and the whole print job has to start all over again. The last 20 page document that I was copying required all of my restraint to keep me from throwing the whole printer out of my second story window. Now I just print or copy one page at a time and even then I still randomly get the error; there is no rhyme or reason to it. The web is full of several other problems that this multi-function machine has, none of which I have experienced. Your post is the first thing I've seen that even mentions this problem that we have had. Unfortunately I have no solution to offer you. Your post helped me realize that I was not alone with this issue, so I just wanted to return the favor. If I come across any solution, I will be sure to post it here. Best of luck to you.

Likely a small sensor that senses paper in the channel has either been bent during a [a[er jam OR has a piece of torn paper in it.

This is usually caused by the quality of paper you are trying to get printed. It might be that your papers are too thin or substance is 16 below. Try using substance no. 20.

Also checked for jammed papers inside your printer. This might be causing the paper not to roll over properly.

Check to make sure the document your sending matches the paper size you have in your paper tray. The reason its telling you to check the paper is because your document size and paper loaded aren't matching

please try this

1. Turn off the printer.
2. Remove any paper trays. Inspect them for wrinkled or damaged paper.
3. Also open the back cover of the printer if this model has one.
4. Open any other doors that give access to the printer's paper path and to the toner or ink cartridge.
5. If necessary, remove the toner or ink cartridge. Place it away from light/ sun light to avoid damaging it.
6. If you find a piece of jammed paper, remove it by holding it with both hands and pulling firmly. The goal is to keep the paper from tearing. If several pieces are jammed together, try pulling out the middle piece first to loosen the jam.
7. If the paper does tear, try rotating the roller gears manually to free the paper. Don't force anything, though. Do this step especially if the jam message comes up repeatedly without any obvious paper jam, there may be a small tear of paper inside.
8. Ones the printer is free of paper Replace the toner or ink cartridge and paper trays, close any doors you opened and turn the printer back on.
9. If the printer paper jam message still appears, then there is still some paper in the printer. Reinspect the paper path.
10. see alternative if the problem is still not solved.
    

alternative :
Load a piece of thick paper, for example photo paper and press the resume button (may be diffrent button on diffrent models) a few times to the printer picks up the paper and puts it through the machine.

Seems you have a dusty roller in the feed mechanism. try cleaning off the roller with some windex (or equivalent) on a towel.

Open the printhead cover carefully. You have to pull up the mini circiut board inside. Here you can clean the sensor.

open and check for paper in the back. sometimes a corner may have been caught in there and will give you the error.

jb