Hello group,I have a disk ii drive that I can’t set the speed on. I use the Apple dealer disk alignment aid software as I always do. If anyone’s not familiar with this program 0 is in the center representing 300rpm. Either side of the zero will represent positive or negative. It shows a -1500 (which I know is not near accurate). Turning the variable resistor it will jump to +1500. Then bounce back and forth between the two positive and negative extremes without touching the resistor. I’ve replaced the variable resistor, as well as the 3 tantalum capacitors on the board as well as making up a new cable. Turning the potentiometer I can hear the drive IS speeding up and slowing down (It’s clearly not spinning at 1500) but it is responding to adjustments. Kind of at a loss here now as I hoped changing those things would have corrected the issue. Any direction would he greatly appreciated.