To clean a IIci (and many other Mac's auto inject
floppy) drive.
Pop a disk into it then remove the screws from the
sides. You need the disk in, otherwise the emergency
eject lever is in the way of the outer case.
Remove the outer case then slide off the "dust
protector" plastic sleeve. (Dust _catcher_ is more
like it!) Grab some canned air and forcibly evict
the family of dustbunnies that have built a nest
in there. ;) Oh, eject the disk before doing that.
(Use a junk disk!)
Now get some white lithium or better yet some
silicone grease and as you work the mechanisim by
hand you'll see all the metal on metal sliding
parts that need greased. A toothpick is handy for
the hard to reach spots. Carefully remove the screws
from the eject motor so you can dab some grease on
the downward pointing eccentric pin and the hole
it runs in. The really adventurous can pry apart
the gearcase to lube the gears. :) (Don't break
off the little plastic tabs!)
If your drive just ejects the disk after inserting
it or you hear a constant motor/gear noise when the
Mac is on then the switch inside the eject gearcase
is broken. It's a simple contact leaf swirch made
from a couple bits of phosphor bronze. When the Mac
sends an eject signal it turns the motor on. The
eccentric pin rotates once and as it returns to
its start, a cam on top closes the switch which
signals the drive electronics to turn off the drive
power. Simple, eh? (IIRC the switch closes, might
open, been a while since I dismantled one of the
eject gearcases.)
At any rate, the auto inject Mac floppy is an
oddball piece of overly complex electromechanical
gew-gawry that apparently was designed mainly
for the "Oooooo!" factor. ;-) Just one of the
reasons we like Macs. (That and mechanical minded
types may like a computer that needs a real lube
job once in a while.)
=====
"The earth swarms with inhabitants. Why then should nature,
which is fruitful to an excess here, be so very barren in
the rest of the planets?" Bernard de Fontenelle, 1686
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