HAMEG 203-7 PDF

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Hi there, I was lucky enough to be given an old Hameg HM oscilloscope by my college. 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 to a specific, tiny range, at which point the line quickly comes up from the the bottom of the screen. As the trace approaches the centre of the screen, it gets wobbly and unstable before eventually shooting off.

If I can persuade the trace to come onto the screen, adjusting the FOCUS knob will move the trace up and down as well as adjust the focus as expected although it disappears off the screen before I can see a significant difference in focussing. The usable range of Y-POS increases and I can get the trace centred and move it trace up and down more easily.

If I move it more than a division away from centre though, it becomes curved and then disappears. This behaviour is identical on both channels. Would this be a good place to start? Thanks in advance for any help -d Last edited by d0pefish; at PM..