Do not attempt this repair unless you know what you are doing. It is not my fault if you hurt yourself.
After that bit of semi-legalise:
I see this is an old question, so Bob may no longer be interested. However, this fault occured on my machine last week. In my case I traced it to a couple of capacitors on the power suppy board - the brown board at the back that accepts the mains lead (unplug!). Replacing these has cured the problem (for the moment). I did not note their numbers but they were a 2200microF and a 470microF, both 16V radial electrolytics, in the middle left of the board, as viewed from the front of the machine, they are not immediately adjacent to each other. In my case the cans were slightly distorted and this made them easy to spot.
In general though, this is a truly awful machine that is not really fit for purpose. We got ours free with a cell 'phone contract. I would have been spitting chips about it long before now if I had paid money for it. I only bothered to try and repair it because I had some un-finalised recordings I wished to keep. If not for these I would have binned it and saved the capacitors!
Alan, December 2007