Philips CDR770 CD-R standalone recorder problems

[b]

Visiting relatives and their CDR 770 (1999 vintage) has the following
problem. After being powered up for only a few minutes, it locks up
and no buttons operate. Totally frozen, and a hard reset is needed -
then a few moments after, it happens again. This happens if a disc is
being played, or the unit is on and idle.

I suspect something is confusing the uPc, possibly bad filter caps in
the PSU, but I do not have the tools and test stuff here, so just
posted to see if anybody has seen this fault and could say if it is
worth my while taking it away to try and fix....
regards, B.