Hi,
A friend offered Oscilloscope UNAOHM G4020 = BECKMAN 9020 = Voltcraft_2040
In first hours worked ok ...
I saw the 0,2 V 1000Hz and other signal in the cinescop.
But now I only see 1 or 2 dots (channel 1 or both or ch 2).
I can move the dots UP and DOWN, LEFT and RIGHT so the screen - cinesc. is working.
I test the trigger, connect CAL 0,2V 1KHz to ch 1 or 2 and the dot go up - down, invert, etc.
A sinos. wave, I can rotate TRIG LEVEL and the dot follow the wave.
But I can't see the wave in display.
Some examples of scope:
youtube.com/watch?v=3nBYp1pN40U
youtube.com/watch?v=fPq1KgQ5ggQ
youtube.com/watch?v=5osskamWJHg
Manual and schemat. I have the French and Germany version.
archive.org/details/voltcraft_Voltcraft_2040_Oscilloscope_Service_manual
https://elektrotanya.com/beckman-industrial_circuitmate_9020_sm.pdf/download.html
Can you please provide help?
Thank you,
Ruy
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