RX02 Problem solved...

Other faults that I've had were a mis-aligned track 0 sensor (causing it to step out beyond the outermost formatted track on the disk), and a low-tension head load pad spring. In the latter case, taking the thing a aper and bending the torsion spring by hand got it going again. The only problem was reassembling it, I found it necessary to make a dummy pin to hold the spring inside the load arm that was then pushed out when the real pin was inserted through the head mouting. In any case, before replacing something as large as a drive unit, I'd want to know which of the various parts was the problem. Do you know, for example, that the head load solenoid works and pulls in correctly? That you can get a signal from the track 0 sensor? That the spindle is turning? and so on... -tony