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The jamming with the copy half way thru is almost always a broken fuser drive gear. The fuser unit is the part that gets hot as the paper exits the machine. Check the back side of this unit. You will see a gear, or part of a gear that is about 1.5 inches across. Either that gear breaks or the cog inside of it shears off and this causes the fuser not to turn. Very inexpensive part at less than $15 and pretty easy to change.
Part number for the gear if you need it is NGERH0540FCZ3
If you had the part I am sure you could find someone to install it if you don't feel comfortable with doing it.
The grinding noise is the clashing of gears. The fuser is composed of 2 rollers, a metal or ceramic with a heater inside (bulb) and a silicon roller to apply pressure. The 'hot' roller is geared and the silicon roller can be geared or free floating. There is at least 1 paper sensor in the the fuser to let the unit know whether paper is there and there when it should or should not be. Sometimes, the sensor gets slightly dislodged and can actually cause a jam. If you are hearing a gear clash, the paper is being pushed through the machine and instead of being pushed through the fuser, it stops because the fuser rollers are not turning. The rest of the machine keeps pushing, crinkling the paper. If there is crinkling, then gears that drive the fuser need to be checked. It is this gear cluster and/or the fuser that need to be replaced.
There is a plastic post inside that a spring connects to that probably broke off, it is part of the plastic frame.
what I do to fix that install a screw thru the rear frame and attach the spring to the screw.
If you open the clamshell like you are removing a jam or replacing the toner cartridge. You'll see a black sponge roller on the bottom of the machine, just to the right all the way in the back you'll a metal plate with white gears inside it that is what the spring is connected to. If you press down on the gear, you'll feel the spring tension if it is still connected.
It is a very common problem for that model
I had the same problem and found a small spring was loose and interfering with the paper. The Spring was on the right side as you look at the printer, near the bottom of the paper feeder. I took it out and it works fine, for now.
Well, for now it seems to be fixed - I opened up the paper tray and there is a little part that grabs the paper on the front of the tray - kinda sticky - I just took a paper cutter and put a couple of scratches on it and it is grabbing the paper for now. I do have some of those to use for replacements - but I had just changed it about a month ago and don't think it needed to be changed out again - they usually last quite a while. So, we'll see how long this lasts. We do a lot of printing on this thing and it has been a great printer - maybe we are just wearing it out!