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single defective pack or drive unit can spread_ a malfunc-
tion to all the units. If packs are subsequently installed on
a damaged disk drive unit, they will also be damaged.
When these defective packs are used with other drive units,
these units will also be damaged. A damaged head or dirty
drive unit will initiate this same damage cycle.
The following procedure is recommended to check disk
packs prior to installation on a disk drive unit:
l.
Visually inspect pack for damage such as covers not
locking onto pack, bent or warped disks, or gross mis-
alignment within the covers.
2.
Remove bottom cover.
3.
Turn pack upside down and level it so that the pack
can be spun inside the top cover freely.
Apply spin-
ning force to the center, not the disk.
4.
Visually inspect pack for excessive up and down
motion (runout) of any of the recording disks, espe-
cially the gold-colored sector disk.
If runout ex-
ceeds 1/8 inch when tested in this manner, reject
the pack.
Also, a l/16 inch or more separation be-
tween the sector disk and the adjacent recording disk
is cause for rejection.
5.
Load the seemingly good pack on a disk drive unit and
remove the top cover.
6.
Turn drive unit power on and allow disk pack cleaning
brushes to start cleaning cycle.
As the brushes move
in and out of the pack, listen for any noise that may
be caused by the brush arms making contact with a
disk surface, or the sector disk making contact with the
drive sector block.
If such noise is heard, turn off
unit power. Reject defective pack. Bring to immedi-
ate attention of Customer Service Engineer.
Caution:
Do not allow read/write heads to load,
since extensive damage to the heads could
result from a defective pack.
7.
If no noise was detected, rep I ace top cover and re-
move pack from drive unit spindle.
Inspect sector
disk on pack and sector block on drive unit for possible
damage from the two making contact. (Sector disk to
sector block contact is most often caused by a bent
sector disk or improper alignment of the machine sector
sensing block.)
8.
As a final test, while a program is being run, listen
closely (near the drive unit top cover) for any head
to disk contact that causes a rasping sound.
If such
noise is heard, turn drive unit power off and remove
. pack.
The pack has sustained mechanical damage.
The drive unit has also been damaged and should not
be run with any other packs, since it may damage them
with the heads damaged by the first failure.
DISK PACK CLEANING
Disk pack surfaces should be cleaned monthly.
The top
and bottom covers of the disk pack should
be
kept clean
and free of fingerprints, label adhesives, etc.
To clean
36
Operating Instructions
covers, use a lint-free cloth (or Kimwipe) moistened with
pure 91 percent isopropyl alcohol (from a chemical supply
house - not a drug store; drug store alcohols often contain
harmful oils, medicinals, and perfumes).
To clean disk pack surfaces, proceed as fol lows:
l.
Stop spindle motor.
2.
Release front latch, pull the deck drawer out to the
stop, and install disk pack to be cleaned on spindle.
3.
Release four half-turn fasteners securing right-hand
(as viewed from front of unit) shroud side cover.
Caution:
The spindle lock mechanism must be enabled
before the disk pack is removed (see Fig-
ure 23).
4.
Disable spindle lock mechanism (see Figure 23).
5.
Wrap a piece of lint-free gauze (or Kimwipe) around a
plastic spatula (or tongue depressor) and dampen (do
not soak) with 91 percent isopropyl alcohol.
6.
Insert the spatula through pack cleaning brushes port in
side of shroud until tip contacts hub of disk pack.
7.
Slowly rotate disk pack while very slowly withdrawing
tip of spatula. (Apply moderate and constant pressure
to disk surface with spatula during this step.) Continue
withdrawing spatula until tip is clear of disk pack
circumference.
8.
Repeat steps 5, 6, and 7 for a disk surface unti I gauze
comes away clean from disk surface.
9.
Wrap a clean, dry piece of gauze on spatula and re-
peat steps 6 and 7 to remove residue released by
alcohol.
l 0. Repeat steps 5 through 9 for each remaining recording
surface of disk pack.
l l. Dampen a piece of gauze with alcohol and wipe clean
the exposed top surface of disk pack. Dry the surface.
12. Use alcohol-dampened gauze to clean both pieces of
disk pack container. Dry the container.
13. Enable spindle lock mechanism.
14. Remove disk pack from spindle, install bottom of disk
pack container, and set pack and container aside.
15. Clean spindle cone of disk drive unit thoroughly with
alcohol-dampened gauze.
To clean shroud and spindle, proceed as fol_lows:
l.
Stop spindle motor.
2.
Release front latch and pul I the deck drawer out to
the stop.
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