[Elecraft] K3 ERR TXG message on most bands

[Paul Ferguson]

I have K3/100 #757 using firmware 1.88 MCU and 1.70 DSP. 

When trying the Low-Power (5W) Transmitter Gain Calibration, it works on 80 and 
20 meters, but on all other bands I get an "ERR TXG" message.

The Synthesizer Calibration and Reference Oscillator Calibration (using WWV 
zero beat) run OK. 

I have checked that I have my two filters (500 and 2.7) setup properly. I have 
been thru the filter bandwidth, freq center, receive filter enables, and 
transmit filter selections several times.

Any ideas what the problem might be? 

73,
Paul
K5ESW