Hi everyone,
at work (a school) we have four HAMEG HM1000, dual channel 100MHz, and each one of them has problems for the CH1 and CH2 vertical position knobs. It is impossible to move up and down the traks, they move super slowly, or jumping up and down, or even stay complitely still, independently of the speed and pressure applied to the knobs.
I didn't open any, but I think the knobs are not encoders since they turn very smoothly. Looks like infinite turn potentiometers.
There is another identical knob used to change the track intensity and it works perfectly in all scopes.
I really do not think that all they need is a spray of contact cleaner, it is a problem too targeted to them. Maybe software problem?
If any of you had the same problem or have any idea of how to try to solve it, it would be really apreciated!
PS: not the same oscilloscope, but similar. At the beginning of the video it clearely shows that moving the traks is very easy and smooth