[Elecraft] KNB3 problems after KRX3 installation

[Brian Machesney]

After installing the KRX3 module, I get an "ERR IF1" message when I
power the radio on (this is the only error message); the manual
indicates a problem with KNB3. Further, holding "LEVEL" produces "IF
N/A" in the VFO B area of the display (the "DSP" NB function appears
to operate correctly based on audible observations). The "ERR IF1"
message does not appear if the KNB3 is disabled via the CONFIG menu.

I took the following dianostic steps:

- Removed the KRX3 and set the KRX3 CONFIG value to "not Inst," with no effect
- Removed and reseated the KNB3 on the RF board, with no effect
- Swapped the "main" KNB3 with the "sub" KNB3, with no effect

There does not appear to be any way to independently set the action of
the "main" and "sub" KNB3, so I can't use the "sub" for differential
diagnosis.

Any suggestions from the esteemed list?

I have K3 s/n 2435 with microcode version 2.67 firmware rev 5
installed today (4 Jan 09).

Regards,

Brian K1LI