[Elecraft] KNB2 "not installed"

[Don Wilhelm]

The 'not inst' message means only one thing - that the AUXBUS signaling is
not happening.
In the case of the KNB2, only P1 pin 7, C9, R6, and U3 pins 3 and 4 are part
of that circuit.  Check each for proper values and good soldering.  You may
want to recheck the soldering at the RF Board header pin too.

Next, check for 6 volts at U3 pin 1 and the resistance from U3 pin 8 to
ground, it should be zero because that pin is grounded - if you find
anything higher than zero check your soldering.

73,
Don W3FPR

> -----Original Message-----
> From: elecraft-bounces at mailman.qth.net
> [mailto:elecraft-bounces at mailman.qth.net]On Behalf Of Allan Bacon
> Sent: Sunday, November 27, 2005 6:34 PM
> To: elecraft at mailman.qth.net
> Subject: [Elecraft] KNB2 "not installed"
>
>
> I just finished wiring and installing a KNB2 in my K2.  When I
> turn the rig
> on, I get the "Elecraft" display, then it goes to the normal frequency
> display.  When I press the NB button, I get the same "not inst"
> message that I got before I installed this module.
>
> Following the troubleshooting hints in the manual, the board is plugged in
> correctly, U3 is oriented correctly. I checked all the P1 pins.
>
>
> Does anyone have any ideas?
>
>
>
>
>
> Allan Bacon
>
> KI4HRN
>
>
>
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