Toshiba RDXV60KB turns off

[Mistycottage]

I have a RDXV60KB machine that no longer wants to stay on. If its been unplugged and stone cold, then it will start up for about 20 seconds, before turning off. Pressing the on button will then only last for about 1 second before it switches off again. Does anybody have, or know where I can get, the service manual, or schematics for this machine ? Or have any helpful suggestions on the problem?