I bought a used mill a few months ago and it came with a Newall Saphire DRO model # SA211000. When I first started using it the display would read "SU LOSE" when I turned the power on. If it turned it off and then on again this message would go away and it would work fine. Now I get the "SU LOSE" message all the time. I'm guessing that this means "sending unit loose." Instead of having flat scales, it has round metal bars that go through the middle of the sending units (sorry if the terminology is wrong). All cables are secure, at least on the outside.
Does anyone have any experience with these or suggestions on where to start looking?