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Old 16th Oct 2017, 7:12 am   #119
Diabolical Artificer
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Join Date: Jul 2009
Location: Sleaford, Lincs. UK.
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Default Re: Scopex 4D-25 Oscilloscope Repair Help

Might be a good idea to measure the resistance to ground of your supply rails to see if you have a short before powering up again. Anything around 100 ohm's ish or lower is suspicious.

TR683 isn't turned on by the looks of it, it's a good idea to measure B - E directly, you should get 0.4v to 0.6v. It doesn't matter which way round your meter leads are.

Andy.
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