I have a Technics seperate tape to tape deck as part of my stereo seperates. It has been fine for a year but has for some reason stopped recording anything. The sound is still coming through on the levels but nothing on playback. I've tried changing the audio cable that goes to record but still the same? I payed 200 quid for it just over a year ago! Any idea's of what the problem might be? or is it knackered ?