I'm looking at buying a Sony TC-K700ES and trying to figure out how much work it needs. It was used last time 3 years ago and was working properly then. When tried now, the transport doesn't move the tape and the deck automatically turns off the function (play, rewind or fast forward) with an audible click. Any ideas about what's causing the hangup? I'm going to take another look at it the day after tomorrow, mostly to confirm that the electronics are okay.