01-06-2015, 02:06 PM
Sunday was officially bad FET day.
The FET is Q596 and I got a reading a little over 700 ohms between source and gate.
It was shunting the resistor section of the timebase switch so that the only change was seen when a capacitor was switched.
Lifting the FET out of the socket cleared the short from pin 8 of U580 and disabled the delayed timebase.
All the main timebase steps came back.
Next session is to try a 2SK43 in it to get the delayed timebase back again.
On screen displays next.
The FET is Q596 and I got a reading a little over 700 ohms between source and gate.
It was shunting the resistor section of the timebase switch so that the only change was seen when a capacitor was switched.
Lifting the FET out of the socket cleared the short from pin 8 of U580 and disabled the delayed timebase.
All the main timebase steps came back.
Next session is to try a 2SK43 in it to get the delayed timebase back again.
On screen displays next.
