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Old 9th Oct 2017, 12:48 pm   #102
OldTechFan96
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Join Date: Jul 2017
Location: Newcastle Upon Tyne, Tyne & Wear, UK.
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Default Re: Scopex 4D-25 Oscilloscope Repair Help

I lifted one side of R426. When I pulled the trig. level knob out the trace did not disappear.

I measured the voltages on TR407:
E - -0.650V
B - 20.84V
C - 20.21V

The fault condition has not appeared since Friday or Saturday so I'll leave the scope on throughout the day and make sure that it is all right.

I think you are right about dry solder joints!
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