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Look for a white sticker, somewhere on the chassis. It will read something like 25C1, 25C2, 25C5, etc. It could also be an E34 chassis (which was a carry-over after NAP bought Sylvania) This will be the number you need for a sams photofact.
Like others have said, the vertical deflection circuit has failed and it would be best to only run the set as briefly as possible in order to troubleshoot the problem. And, turn down the brightness and contrast just to the point where the line is visible. Otherwise, you can quickly burn a line in the CRT.
I think by '84, most sets were using a single IC, instead of multiple transistors, for the vertical output stage. If it uses an IC, that will probably be the problem. Along with a bad IC, you will probably find that the resistor that feeds B+ to the IC to be open and there will likely be bad electrolytic capacitors that could have caused the IC to fail.
Those early-to-mid '80's NAP sets are generally very good TV's and are well worth repairing. They are miles ahead of any TV, made today, with the Magnavox badge.
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