I just installed a new panel and have this problem.( in a 707) When changing the heading it only moves by 10, for example: If you are on 250 degrees and want to go to 255 degrees, it goes to 260 degrees. The same thing happens to the altitude setting they jump by a thousand feet, from 10,000 and you want 15,000 the darn thing jumps to 20,000. Any help is appreciated.