Does this unit have any presets for Focus and tracking gain / offset
/error adjustment. What if an electrolytic in the focus circuitry has
drifted a bit in value causing improper gain or bias?. The objective
lense might not traverse through the required excursion for an FOK flag
to be generated. Tilting the lense would put it on an inclined plane,
less drive would be required for it to traverse enough for good focus,
FOK is read, spindle is switched on.