It's most likely the 10 uf @ 16v aluminum bypass caps. They dry out.
You'll probably have to replace them all.
Phil J

"Greg" wrote in message
...
I have a Philips PM3323 digital oscilloscope which has not been used for
some time. It has developed a problem where both A and B channels have
become very noisy such that the noise on the display is now larger than
the
wanted signal - making the scope unusable. Timebase and y-axis functions
all
appear to be still working OK.
Can anybody tell me whether this fault is likely to be economically
repairable?

Many Thanks,
Greg