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Fujitsu M255XK Customer Engineering Manual page 40

5 1/4" mini-flexible disk drive
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4.2.4. Additional Maintenance Precautions (Continued)'
Operating Environment
Perform disk drive maintenance on a clean bench in normal
temperature and humidity conditions.
If the work bench is not
clean, dust or dirt can adhere to the Read/Write heads, disk, and
other sensitive components.
Head alignment checks and adjustments should be done in an
environment at 65
0
F
+20
and 55% Relative Humidity.
Head
alignment, inspection and adjustment should be made after
leaving the drive in the room for 2 hours or more, allowing it to
adjust to this ideal temperature and humidity conditions.
Ground Probe Connection
When measuring Test Points on the Main Circuit Card use TP3
(Ground), on the Main Circuit Card, to ground the instrument.
When measuring a Test Point not the main Circuit Card, use
TP3, or a Ground point on the drive or on the user's system.
Disk Drive Orientation
Unless
indicated
otherwise,
Disk
Drive
inspections
and
adjustments may be made with the unit placed horizontally or
vertically as shown in Figure 4-2.
Af
RorizoDtal position
Vertical positiOD
Figure ... 2 Disk Drive Orientation During Maintenance
4.3 t-EAD a...EANING
When the drive is used in a dusty environment, it is advisable to periodically clean
the Read/Write heads with a commercially available cleaning disk.
Cleaning the
heads may improve data reliability, even in a normally clean environment.
Approximately 5 minutes are required to clean the Read/Write heads, when using a
commercially available cleaning disk.
Use the cleaning disk at the intervals recommended and with the procedure given
on the package of the cleaning disk.
Optimum cleaning time varies with the type of cleaning disk used.
Excessive
cleaning will not accomplish better performance and may even cause premature
head wear.
TS-021-013087 ••• 01
4-8

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