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HC 5502 20 Mhz scope problem .

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Jade Leo

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Hi everyone .

I have been recently logging in using facebook and have decided to join this board witch i find pretty interesting .

So my problem is with an old hung chang 5502 oscilloscope that was still unused though , i have used it mainly for monitoring some high frequency signals coming from switch mode power supplies pwm ICs .

So i have checked one day one and i have shorted two pins of the ic witch resulted in not reading any voltage amplitude any more on both channels even after adjusting the trace rotate pot .

So now i have two theories :

Probe is bad and scope only needs calibration ( witch i hope )
Internal problem on some PCB ( :shock: )

this is the display i got after the event :

nUhfl5W.jpg
 

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