Micropolis head fine adjustment jig

thingiverse

This is a jig for adjusting heads on micropolis SCSI hard drives. Vintage 5.25" ones. A problem with these drives is that the rubber bumpers on the head assembly can deteriorate, allowing the head to drift off of its servo track. Connect your scope to the SS pin on the controller, attach the jig, and slowly turn the adjustment screw until you see a valid servo signal. Scope might not even be necessary, sometimes drive will take off on its own when it sees the valid signal. This jig does require an M2.5 heat-set insert for the adjustment screw (it's pressed in to the "inner side" of the fixed piece). The pivot between the fixed piece and the lever piece uses an M2.5 screw. USE AT YOUR OWN RISK. While I tried to save a drive with this, I was ultimately unsuccessful (due to a myriad of other problems during the diagnosis and attempted repair)