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door manually and continue inserting the car-
tridge carefully while observing that the disk
slides properly between the two read/write
heads and in the mouth of the gage.
9.
After the cartridge is pushed to the foremost
position and touches the two cartridge stops,
lower the cartridge door upon the upper side
of the gage-base, and carefully lower the car-
tridge by operating the handle.
WARNING: Avoid scratching the disk while revolving
disk through gage. Any scratching of the disk will
cause damage: Be particularly careful in the proce-
dure that follows.
10. Turn the spindle pulley slowly by hand.
Listen
carefully to determine that disk does not· touch
on the gage lip.
If
any contact noise is heard,
readjust the disk run out gage by turning the
adjusting screw. The disk is in proper height
and its runout is within permissible limits, . if
the spindle can be turned one revolution without
disk surface touching gage lips.
11. After the checking procedure is completed,
carefully remove the cartridge, then the disk
runout gage. Replace the door opener bracket
and air deflector first, then the disk guide, and
the top cover last.
4.2.4 Disk Cartridge Replacement Conditions
Replacement of a disk cartridge is necessary when
any of these conditions exist:
1.
The cartridge has sustained mechanical damage.
2.
A surface of the disk is scratched or gouged
and is causing read/write errors.
3.
An embedded particle or surface contamination
is present on a disk surface and the particle
cannot be dislodged by cleaning.
4.3 PLENUM Am FILTER
4.3.1 Plenum Filter Air Flow Test
1.
Prepare a test gage as follows:
4.4
a.
Fold an IBM card at column 40 and again at
columns 20 and 60 so that card is four layers
thick.
b.
Tear off and discard one layer.
c.
Use transparent tape to secure edges so
that card will remain flat in folded position.
2.
Verify that blower is operating and disk cartridge
is removed.
3.
Place test gage over that half of the air valve
duct which is nearest the disk cartridge receiver
handle.
If
test gage remains in this position,
the plenum filter is clogged and must be replaced.
If
it blows off or will not remain where placed,
the air flow is sufficient and the plenum filter
does not require replacement.
4.3.2 Plenum Air Filter Removal and Replacement*
WARNING: When replacing plenum air filter, make
certain that the foam rubber seal is between the air
filter and baseplate.
If
this seal is not in its proper
position, leaks can result which will allow foreign
particles to be blown into the cartridge. Also clean
the plenum cover and cartridge air duct with lint-free
tissue dampened with 91% Isopropyl Alcohol.
1.
Remove plenum cover by removing single
mounting nut which also secures the filter.
2.
The air filter can be dropped vertically downward.
3.
Replace air filter by reversing Steps 1, and 2.
4.4 BLOWER ASSEMBLY
4.4. 1 Blower Assembly Removal and Replacement*
1.
Turn off all power to machine.
2.
Disconnect blower motor leads from terminal
strip located in ac box.
3.
Remove four binding-head mounting screws
securing blower motor mounting bracket to
baseplate. The blower assembly must be moved
forward 1/2 inch for duct to clear electronic
gate.
4.
The blower may now be lowered vertically away
from baseplate.
5.
Replace blower assembly by reversing Steps 1,
2, 3, and 4.
4.4.2 Blower Wheel Removal and Replacement
1.
Remove face-plate at inlet to blower assembly
which is secured by three screws.
2.
Loosen set screw securing blower wheel to motor
shaft and slide wheel out inlet to blower scroll.
*Altemate procedures
11'",
contained in Chapter 7 for machines with
serial numbers 00001 through 00050.
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Troubleshooting
