[Elecraft] A Bad Thing Happened To My K2

[AD6XY]

If you can hear nothing at all on 40m but the other bands are OK the likely
problem is in the low pass filters on the K2 RF board. I surmise relay K2
which selects the 40m filter is not operating. Another possibility is K1 the
bandpass filter for 40m though I think that less likely.

U1, the IO controller chip controls the  relays. The pin Check pin 27 is
correctly controlling relay K2 on the RF board. If the chip is dead this
output will stay low. If it goes high on 40m but the relay does not operate,
the relay is dead - or the contacts are welded in place. Do the same for pin
25 which controls K1.

Mike
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