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HP 1740A Oscilloscope repair question.

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Jimboi

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I purchased a HP 1740A Oscilloscope from E_bay for $80. It shows the traces on the screen and it seems that everything is working. I'm a newbie with Oscopes. The problem I'm having is the trace on the screen is not always showing up. Channel A volts/Div switch needs cleaning as the traces
 
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