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Fujitsu M255XK Customer Engineering Manual page 51

5 1/4" mini-flexible disk drive
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c. If head alignment is within 20% (after the 4 track move in/out) select the
other head and repeat procedure steps 1 through 4, then proceed to para-
graph 4.4.11.
5.
Adjust track alignment, using the following procedure, if the Alignment Error
is greater than 20% as described above in step 4. Refer to Figure 4-12.
(a) Slightly loosen the screws holding the stepping motor.
(b) Push the tip of a screwdriver into the tooth in the stepping motor (from
the rear of the Disk drive).
(c) Move the stepping motor only slightly, and then step the Read/Write
heads several tracks in and out, until the Alignment Error is minimum.
(d) The adjustment should be made to minimize the Alignment Error for both
side 0 and side
1.
6.
Tighten the 2 screws for the stepping motor in sequence a little at a time and
repeat the adjustment (if required) until the Alignment Error is less than ±.20%
(see step 4 for how to measure this 20%), when the screws are tightened to
the specified torque of 20 inch pounds
(9
kilograms em).
9.
Remove the alignment disk and apply screw lock liquid to the heads of the
stepping motor mounting screws.
10. Inspect and adjust Track 00 sensor (refer to paragraph 4.4.11).
Figure 4-12 Track Alignment Adjustment
TS-021-013087 ••• 01
4-19
Stepping
IDOtor
IIIOWlt
screw
l

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