I am trying to repair 2 x disk II drives where they pass the speed tests I run on them (hooked up as the second drive) but they don't seem to even register when I do an allignment test (or other drive tests I have disks for).
Before condemning the circuitry, and having spent quite some time studying the mechanics of the ones I am trying to fix, I note the two 'stainless' bars on which the stepper motor adjusts the position of the head have a little corrosion on them and the movement of the unit along them is not smooth and in some places faces resistance.
Is there merit in cleaning and lubing these bars (withsomething like deoxit)? On both units, with the case off, when I run the allignment software, the drive seems to try and get the head where it needs it, but never passes the test. I notice the bar retaining screws have green paint from the assembly plant, so I guess their position is critical.