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

Is it possible to clean the front switch?

Greg wrote:
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

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

The front panel switches control the voltage range indicated on the display
correctly, but don't seem to affect the magnitude of the noise on the trace.
I suspect the problem may be on the A to D converter card.

Is it possible to clean the front switch?

Greg wrote:
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?