K3 Not Turning Off

[Dennis Egan]

My K3 will no longer turn off.  The LEDs on the front panel won't go
off, and all the
lettering on the Liquid Crystal Display will disappear but the LCD will
still be backlit.

I've traced it down to the 15pin accessory plug; all I have attached to
it is a 1 transistor
keying circuit to key FSK on Pin 1.  If that plug is attached, the K3
won't shut off.  If that
plug is not attached, the K3 shuts down normally.

Will the 12V sense mod allow me to leave the 15pin plug in and still
shut down K3 properly?
Or should I try a different circuit to key FSK?

Dennis W1UE
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[Ed Muns, W0YK]

> My K3 will no longer turn off.  The LEDs on the front panel
> won't go off, and all the lettering on the Liquid Crystal
> Display will disappear but the LCD will still be backlit.
>
> I've traced it down to the 15pin accessory plug; all I have
> attached to it is a 1 transistor keying circuit to key FSK on
> Pin 1.  If that plug is attached, the K3 won't shut off.  If
> that plug is not attached, the K3 shuts down normally.
>
> Will the 12V sense mod allow me to leave the 15pin plug in
> and still shut down K3 properly?
> Or should I try a different circuit to key FSK?

Do the 12V sense mod.  It is easy and quick and should solve this problem.
My 1-transistor FSK keying cables are permanently connected to the K3 ACC
jacks.

Ed - W0YK

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