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4. 1.2.2 Disk Runout Check
The term runout means edge wobble, or up-and-down
movement, while the disk is rotating. To check runout:
1 . Turn off power and remove top cover.
2. Open cartridge clamp arms and remove disk
cartridge.
3. Place hub tool, part 2537550, on disk spindle.
4. Insert disk runout gage, part 2536591, under top
rim of disk cartridge (Figure 2-13) so that gage arm
rides on lower surface of disk. Fit cartridge support
clips, part 2537562, in the four slots around rim of
cartridge (see Figure 2-12).
5. Remove left-hand cartridge clamp arm by removing
the three attaching screws.
6. Mount disk cartridge on spindle of hub tool,
aligning the cleaning brush entry port with gap
provided by removed left-hand clamp arm.
7. Slowly rotate disk by turning spindle pulley. If
pointer on gage moves more than two divisions of
the scale, runout is excessive and disk cartridge must
be taken out of service.
8. Remove disk cartridge and all tools.
9. Re-install cartridge clamp arm.
10. Remove clips from disk cartridge. If cartridge is
serviceable (see step 7), re-install it in machine and
close clamp arms.
11. Refit top cover.
4.1.23
Cartridge Cover Cleaning
Clean dirt and stains from the cartridge cover with
lint-free tissue that has been dampened with isopropyl
alcohol. See 2.3.2 for part numbers of tissue and
alcohol.
4.1.3 Fixed Disk
4.
1.3. 1 Inspection and Check
An
indication of damage to the fixed disk may be gained
from the condition of the lower R/W heads, persistent
read or write errors, or noises from the machine. If
head-to-disk interference has occurred, change the heads
and the disk. Refer to the error recovery procedure for
HDI, on Figure 2-3. Inspect disk cartridges that have
been used prior to an HDI incident to make sure that
they have not been dropping particles.
Visually inspect the upper surface of the fixed disk,
after fust removing the fixed disk shield. Examine the
disk surface for:
2-14
(5/70)
Runout of more than two
L _ _ _ _ _ _ _ Runout Gage Part 2536591
Cartridge Base
Gage arm riding on
~ower
surface of disk
Figure 2-13. Runout Check - Removable Disk
[07538)
1. Spiral scratches.
2. Scratches that expose metal.
3. Embedded particles.
If the lower surface is suspected, remove the disk to
inspect it.
Carry out the disk height and runout check as
directed by the error recovery procedure flowchart, or
when fitting a new fixed disk, as follows:
1. Remove top cover and disk cartridge.
2. Remove fixed disk shield, pillar for head cable
clamp, and head connectors from Z gate.
3. Mount disk-clearance and head-load spring gage,
part 5831639, on machined pad (Figure 2-14) near
the head entry port, with gage fmgers turned
towards the layshaft. Secure tool with captive screw
in hole vacated by head cable clamp pillar.
4. Swing fmgers 02 and 03 of gage towards head entry
port so they overlap edge of disk.
5. Manually rotate disk (by the spindle pulley) through
one revolution and observe if disk touches either
fmger.
Note:
If the disk touches a gage fmger, the disk is
warped and must be changed.
6. Swing disk fmgers away from disk.
Disk
Height Oieck
Runout Check
Disk must run clear of either inner gage face
Runout of more than two divisions is excessive
Runout gage, Part 2536591, mounted on disk-clearance and
- - - - - - - - - - - head-load spring gage, Part 5831639, (shaded area)
Fixed Disk
Gage riding on lower surface of disk
Figure 2-14. Disk Height and Runout Checks -
FIXed
Disk
(07539]
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