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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