I have a spindle drive on my 97 Haas VF-2 that may be bad, it's a Magnetek GPD 515. I have the manual and it says to check the bus voltage at display U1-07, but I can't seem to get to that display. I found U1-01 thru U1-06 but then it goes to some other place rather than U1-07. I need to check the voltage before sending out for repair.

Thanks is advance-----Mike