Opportunity is missed by most people because it is dressed in overalls and looks like work. - Thomas Edison
There's a section in one of the maintenance menus (hold three buttons down while turning on) where it will read the current head temp.I'd go there and then wiggle things while watching for jumps.I have a few DX5's upstairs I believe, only the leftmost (photo?) black channel works. You can have one if need be.When installing new heads you have to input the head rank in the firmware, has to do with voltage and the tempthe head should run at.