Focus adjustment on JDR 3500 o'scope

["Juan Jimenez"]

Hi folks,

Does anyone have a calibration/maint manual for a JDR Instruments model 3500 
o'scope? I bought it cheap for my son ($100), he is building his own analog 
synth, and it works great, but the focus control no longer brings the trace 
into focus when I turn it all the way to the right. I need to adjust this 
but I don't have a manual.

Detailed instructions will do as well.

bd5 at
bd5 dot com

Thanks! 



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