Hi guys.
I've got an old analog Philips PM3212 scope that was sitting unused under the bench for years, it has some problems which I now decided to fix. The biggest problem were dirty switch contacts. I've cleaned the switches and they now seem to work fine.
There's still another problem and I'm not sure where to start looking.
The scope starts clipping waveforms if the input amplitude gets too high.
Here I'm measuring a 10kHz sinewave of 0,5Vpp vertical ampl. is set to 50mV/div and everything
is still fine.
Now if I switch to 20mV/div the clipping starts:
The funny thing is this is happening on both channels. So I somehow don't think the Y amplifier
is to blame.
I do have the servie manual for the scope but don't really know where to start looking.
Any suggestions would be much appreciated.