I don't know this unit at all, but I can make some guesses. There are basically 2 types of electrically driven punch -- those where the solenoids operate the punch pins directly (like the Facit 4070) and those where the solenoid operates a linkage which enables a drive from the motor/camshaft to operate the punch pin, like the Teletype BRPE, the GNT 34, etc. Firstly, is there any mark on the tape at all? If not, try operating the solenoid armature by hand (with the motor turning if necessary). If it punches now, then suspect that either the solenoid is defective, wildly out of adjustment, or that (hopefully) the drive electronics is malfunctioning. I say hopefully to the last one because electronic parts are easier to get and cheaper than mechanical ones! If it still doesn't work, look for damaged, misadjusted, or sticking linkages.

If there is a mark on the tape then either the punch pin is _very_ worn (unlikely if the others are fine) or the solenoid or drive link needs adjusting. Or maybe the solenoid is mechanically defective -- the rotary solenoids used in Facit 4070s suffer from this. Often they can be repaired once you understand how they should work. Don't overlook the possibility of old lubricant gumming things up (!). In fact you probably should clean and lubricate the machine right now. The punch pins are normally machined to fit in one hole in a particular die block and shouldn't be moved around. So a new die will come with new punch pins. Expect to pay a few hundred dollars for a block+pins -- at least that's the sort of price I've been quoted. If it is that easy to take the die out, do so. Take out the pins, keeping them in order (9 jam jar lids :-)). See if the 'defective' pins are noticeably shorter than the rest -- if not, the problem is likely to be elsewhere. -tony