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As you haven't given any specific details regarding exactly how your camera is jamming then the only answer is that your camera needs a professional strip down and clean.
If you're lucky then the jam is simply due to the camera being old and gummed-up due to dried-out lubricant films, but it could also be due to parts failing due to wear and tear.
The F3 is definitely not suited to DIY repairs, and a freshly-serviced and functional F3 should be good for many more years of service. There are also plenty of them about, so repairers are familiar with them and will usually have a stock of new and used spare parts.
The only thing you can try is to see whether the jamming occurs with just one particular lens. If so then it's the lens which needs servicing/replacement rather than the camera, but a preventative CLA (Clean, Lubricate, Adjust) service on the F3 would still be advisable as they were intended to be regularly serviced. If the camera has its original foam light seals and mirror buffer then they will also be either decayed into sticky corrosive black goo by now or have gone further and dried-out and crumbled away. A routine CLA will usually include seal and buffer replacement as a one-off additional cost and as modern materials do not decay it should never need doing again.
Unscrew the rewind knob and remove a circlip under it (You may need to grind the tips of a pair of round-nose pliers for this). Remove the disk and pull the rewind shaft stop off the hub (a spring and flat plate). Remove the two screws. You'll need a special tool to remove the little stud the shaft stop was pivoting on. Take a 1/8 inch screwdriver and grind a slot in the blade. Use this tool to remove the stud, then remove the three screws from the plastic cover ring.
Do not remove the center screw from the shutter speed dial. Remove three screws from the side of the dial and pull off the grip ring.
Usually the automatic rewind starts when the film roll has come to the end. You can rewind also before that by a rewinding button you'll find usually somewhere in the camera body.
To rewind manually, press the film release button (consult the manual if you don't find it) and use the rewinding lever to rewind the film. See this for inspiration: http://www.ehow.com/how_2028878_film-mm-manual-slr-camera.html
It means "Film remains in the camera after film rewind complete."
If this is happening after shooting, the remedy is simple: open the camera and remove the film. If this is happening right after loading the film, then you've got a more serious problem: the camera is rewinding the film upon loading.
I am not familiar with Nikons; however, Minolta and Canon SLR film camera's film compartments are opened by lifting up on the film rewind mechanism on the top left side of the camera.
If the Nikons are designed like Minolta and Canon, there will be a small tab to push in at the bottom of the camera. This releases the film and allows it to be rewound. At the top left will be a small rewind lever that is used to do the rewind. The part of the camera that the rewind lever is attached to is pulled up to open the back of the camera.
Check to see if the manual shutter release (the one that is to the left of the lens when you look at the camera head on) is not cocked and ready. It should have its lever resting against the lens collar. Since this is the manual release of 1/80 second, this can sometimes be the cause of the problem. Also, make sure the shutter speed dial is set to something other than the 80 speed.
Since you can get a reading on the light meter, its likely not a power issue, plus the F3 is capabale of pulling power either from the drive or from the battery compartment.
Sometimes the electronic F3 shutter button can seize due to lack of exercise. The curtains won't need placing unless they are worn, but the switch may need replacing.
For some reason the camera thinks it is at the end of the roll. You could turn off auto rewind, Custom Menu #1, to 0. This issue could manifest itself in cold weather as well, film becomes too stiff causing drag tripping the auto rewind. Call Nikon Film 1-800-645-6687. The camera may need to go in for CLA.
It's not very easy- you have to remove the rewind knob and dials at the left end of the cover and the speed dial and winder arm at the right side. Then the 5 small screws around the cover. It is a delicate task because under the cover there are some very sensitive electronics. If you are determined to go ahead with it then your best bet might be to get a service manual.