Re: Hameg 203-7 Oscilloscope repair

Thanks

I haven't cleaned any switches or pots yet, but for the pots I disconnected the major ones and measured their resistances while turning them and their resistances all went up and down uniformly and smoothly with the correct ranges.

When the intensity is low (and the picture more stable), the pots move the trace very smoothly with no jumpiness, so I don't think they are suspect.

I've been playing with X-Y mode to get the voltage measurements for when the beam is centred.

I get about...

Re: Hameg 203-7 Oscilloscope repair

Thanks for the reply.

It would be a shame if it was a faulty tube, but really? I'm not convinced it's a total write-off yet - when I can get the trace to show, it is very sharp and bright. I'm just having trouble with getting its position steady.

My college has 10 more of these oscilloscopes. There's a small chance I can try to borrow a working one and test another tube on it...

Hi there,

I was lucky enough to be given an old Hameg HM203-7 oscilloscope by my college.
It has a fault, so I'd love to try and repair it, I've always wanted a scope to help with my other projects.

I'm not an expert when it comes to diagnostics and finding faults, so would really appreciate some pointers as to where to start looking. I am very competent when it comes to soldering though, so swapping parts out is no problem.

The scope switches on fine, but to get the screen to show a trace, I have to VERY carefully and slowly tune the Y-POS knob...