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7901A
5-1.
INTRODUCTION.
5-2.
This section contains disc drive maintenance pre-
cautions, a list of required test equipment, preventive
maintenance information, general repair information, per-
formance tests, adjustment procedures, troubleshooting
information, parts lists, parts location diagrams, schematic
diagrams and integrated-circuit details.
5-3.
5-4.
MAINTENANCE PRECAUTIONS.
WARNING
This unit has dangerous line voltages
present at various points within the
chassis.
Use
extreme
caution
when
working on the unit with the cover
removed, or serious injury or death to
personnel migh t result.
REOUIRED TOOLS AND TEST EOUIPMENT.
5-5.
Table 5-1 lists tools and test equipment required
to service the disc drive. Equivalent equipment may be
substituted in each case.
5-6.
PREVENTIVE MAINTENANCE.
5-7.
The disc drive requires a minimum of mainte-
nance. When the disc drive is placed in a severe environ-
ment, a greater frequency of preventive maintenance might
be required (an environment that has an unusual amount of
dust, smoke, oil vapor, etc is considered severe). The
following discussion provides instructions for performing
filter system checks, replacing the absolute filter, and pro-
cedures for inspecting and cleaning the disc drive. Preven-
tive maintenance should be performed according to the
schedule given in table 5-2.
I
CAUTION
I
Do not remove the disc drive top and
bottom covers in severe environments. An
environment free of dust, smoke, oil
vapor, etc is necessary to protect against
disc surface contamination.
Do not run the disc drive for extended
periods without the front filter screen as
this will shorten the life of the absolute
filter. Also, do not run the disc drive
without an absolute filter.
MAINTENANCE.
5-8.
FILTER SYSTEM CHECKS.
5-9.
Periodic checks should be made on the overall
effectiveness of the filter system. Filter checks are made as
follows:
a. Remove the top cover and apply power to the disc drive
by pressing the POWER switch.
b. Open the drive front door and remove the disc cartridge
(if one is installed).
c. Remove the cartridge receiver and close front door.
d. Manually press down on the cartridge interlock switch
and press the LOAD switch.
e. Check for positive air flow through the filter outlet. If
restricted air flow is evident, clean the filter screen and
replace the absolute filter. (Refer to paragraph 5-10.)
f.
Power down the disc drive by pressing the LOAD
switch and replace the cartridge receiver using care not
to contact the carriage assembly.
g. Replace the disc cartridge (if originally equipped) and
top cover.
5-10.
ABSOLUTE-FILTER REPLACEMENT.
5-11.
The absolute filter should be changed once each
six months in normal computer room environments. If
evidence of restricted air flow exists, the contaminated
filter should be changed immediately. To change the filter,
proceed as follows:
a. Press POWER switch to remove power to the unit.
b. Remove bottom cover.
c. Loosen clip on blower housing.
d. Remove three capscrews that secure the filter assembly
to the frame.
e. Remove the absolute filter.
f.
Install a new absolute filter part no. 3150-0231, and
tighten capscrews.
g. Replace clip to blower housing.
h. Replace bottom cover.
5-1
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