What sort of scope do you have?
In general, with signal tip of scope probe you check certain circuit test points (I propose you 6 specific test point in bottom attached PD circuit)
to check individual circuit stages on working status (red line is of scope probe tip - ground probe clamp is always at the same point/ground).
Ground clamp of scope probe should go to circuit ground for check of all marked test points.
You need to set proper vertical sensitivity (voltage per division) in scope channel used and proper scanning time.
You should follow the same test logic (test on working specific circuit stages) with all circuits/schematics.
In general, with signal tip of scope probe you check certain circuit test points (I propose you 6 specific test point in bottom attached PD circuit)
to check individual circuit stages on working status (red line is of scope probe tip - ground probe clamp is always at the same point/ground).
Ground clamp of scope probe should go to circuit ground for check of all marked test points.
You need to set proper vertical sensitivity (voltage per division) in scope channel used and proper scanning time.
You should follow the same test logic (test on working specific circuit stages) with all circuits/schematics.


Comment