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I
POWER DOWN
The following procedure powers down the drive.
1. Stop the spindle motor and unload heads
by either issuing a Set Standby State
(Taq
13)
from the controller or press-
inq the
S~T/STOP
indicator/switch on
the operator panel.
I
WARNING
j
If pressing the START/STOP switch
does not cause the heads to unload
and the spindle motor to stop the
followinq procedures must be followed
to avoid personal injury or damage
to the heads and· disk pack.
1. Manually retract heads as follows:
a. Open top cover from rear
b. Disconnect yellow lead from
voice coil
c. Manually retract heads following
precaution qiven in Section
5
of
this manual under Maintenance
Preliminary conditions
2.
Remove main ac power from drive by
openinq UNIT
PO~R
circuit breaker.
3.
Determine cause of failure (nor-
mally an open lead to voice coil.
2.
Remove main ac power to drive by openinq
UNIT POWER circ:ui t breaker.
DISK PACK HANDLING
To ensure maximum disk pack life and relia-
bility, observe the followinq precautions:
1. Store disk packs
in
a machine-room
atmosphere (60
0
F to 90
0
F, 10% to 80%
relative humidity).
2. If a disk pack must be stored in a
different environment, allow two hours
for adjustment to the computer environ.-
ment before use.
3. Never store a disk pack in sunliqht,
in a dirty environment, or on top of
another disk pack.
4. Store the disk packs flat, not on edqe.
S. Always be sure that both the top and
bottom plastic cannister covers are on a
disk pack whenever is is not actually in-
stalled in a drive.
2-6
6. When markinq packs, use a pen or felt-
tip marker that does not produce a loose
residue.
Never use a lead pencil.
write
on the label before it is applied to the
disk pack cannister.
7.
Always close the disk drive pack access
cover after loadinq or removinq the disk
pack.
This will allow the disk drives
positive air pressure system to keep the
pack area free of any foreiqn particles.
8.
Do
not attach any label to the disk pack
itself. Labels
will not remain attached
when the pack is spinninq and catas-
trophic head crashes may result.
All
labels should
be
placed on the pack
cannister if
r~quired.
DISK PACK INSTALLAnON
Malee certain that the disk pack to
be
in-
stalled has been properly maintained.
1. Raise drive front cover.
2.
Lift the disk pack
by
the plastic
canister handle.
f
3.
Disenqaqe the bottom dust cover from the
disk pack by squeezinq the levers of the
releasinq mechanism in the center of the
cover
and.
liftinq the cover off.
Set
the cover aside to an uncontaminated·
storaqe area.
CAUTION
Make certain the heads are fully
retracted.
4.
Place the disk pack onto the spindle
NOTE
A spindle lock mechanism (ratchet
brake) is actuated when the disk
pack canister cover is on the
spindle.
A "click" may be heard
as the lock mechanism enqaqes.
The machanism holds the spindle
stationary while loadinq or
un~
loadinq a
disk pack.
S. Twist the canister handle clockwise
until pack is locked in place.
6.
Lift the canister clear of the disk
pack and set it" aside to an uncon-
taminated storaqe area.
83318200 E
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