[Elecraft] K3 Test Mode Problem

[Harvey]

The test mode doesn't operate like it did with previous firmware revs. I'm using an MH-2 mic with K3 s/n 2231 with firmware 2.78. When I key up, vfo B shows 'ERR TXF' and I can hear myself in the speaker.  When I unkey I can't key the mic again without pressing any key pad on the front panel to reset the error on vfo B first. Am I doing something wrong? I used to be able to key the mic repeatedly in the test mode without any error hangups.

Harvey  KN6VP
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