19-12-2016, 01:19 PM
Switches are a pain if you are not good at reading circuit diagrams.
I took a challenge and won against a big scope.
Only about a third of the timebase ranges were working and I had to find out where all the wires from the switches went to and trace it through.
Once I had found the wrong signal at each end of the switching system it was an easy fix.
It took a couple of hours to sort out the search thru the switching and then a matter of minutes to find a faulty JFET and another half an hour digging out a spare.
The FET was socketed so I did not even have to warm up a soldering iron.
I took a challenge and won against a big scope.
Only about a third of the timebase ranges were working and I had to find out where all the wires from the switches went to and trace it through.
Once I had found the wrong signal at each end of the switching system it was an easy fix.
It took a couple of hours to sort out the search thru the switching and then a matter of minutes to find a faulty JFET and another half an hour digging out a spare.
The FET was socketed so I did not even have to warm up a soldering iron.
