[Don Lind]

There is a small clutch between the manual tuning and the tuning mechanism. The clutch is normally engaged. When any button is pushed, a slide bar disengages the clutch so the manual tuning does not load the buttons and the knob does not spin. The clutch is either dirty or out of adjustment. Just examine it and the problem should be obvious. Clean with alcohol and/or adjust by moving the stationary disc closer to the pressure disc.