David, I experinced a similar problem with my K2/100. The problem was an open rf choke in the data lines from the J8 Aux I/O. Have forgotten whether it was RFC6, 7, or 8 but checked each for continuity, found an open and replaced choke. Computer control resumed. Hope this helps.

73, Jack


Jack H. Shrawder, KT6JS
K2 3256


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