I just scored one, and fixed it.. i have a weakness for HP..
but I found a wierd bug, i think it is sw related,
cant really be hardware ? since i can reverse the problem from ch1 to ch2
depending on what ch i enable first,
If anyone here know this scope ? used one ? mine is the 2ch model,
there is also a 4ch model.
maybe you still own one that works ?
please see the bug i explain in this video,
and tell me : is this normal ?? are they all like this ?
HP 1980B oscilloscope Measurement System Analog/Digital 100MHz
https://youtu.be/Mux7XgN1E74?si=DahF5HBiSATP_nKJ