Hi Group, I've been off this reflector for a year but I've run into a problem, so I'm back. K2 #922 works just fine, however I'm unable to change the filter settings. The dc voltages at pins 10 and 15 check normal. I made up a new test probe and no help. Has anyone else had this problem? Any help is always appreciated. Bob Baxter AA7EQ Bisbee, Az.