Digital Deaigns M4A

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Have you given up on finding a K30A?

The diode D82 is a 5v Zener. That's limiting the gate voltage to -4.7v. That may not be enough to get a J111 to switch off. Replacing that diode with a 10vZ and installing the J111 with the correct pin configuration (don't let the leads short) may allow it to work.

If you try it and it doesn't work, post the DC voltage on all 3 terminals of the J111.
 
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