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Fujitsu M255XK Customer Engineering Manual page 64

5 1/4" mini-flexible disk drive
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4.5.2 Stepping Motor and Steel Band Replacement (Continued)
15. Install the main circuit card by reversing steps 2 and 3.
16. With the exerciser, seek between Track 00 and the innermost track and ensure
the steel band stays straight. If the band does not stay straight, shut off the
unit and readjust the band.
After each adjustment of the band, tighten the
holding screw to the specified torque.
17. Adjust track alignment (paragraph 4.4.10).
lB. Adjust Track 00 sensor (paragraph 4.4.11).
19. Install the shield cover assembly.
4.5.3 Spindle Motor Replacement
Tools Required:
Phillips Screwdriver, M3
Tweezers
Wire Cutters
Refer to Figure 5-5.
1.
Remove the shield cover (item 44).
2.
Remove the mounting screws from the main circuit card and lift up the
circuit card (item 43), unplug all connectors at the main circuit card assembly
and remove the card.
3.
Remove the screws holding the main circuit card shield plate and remove the
plate (item 23).
4.
Remove the three spindle motor mounting screws (from the spindle side) and
remove the spindle motor from the rotor (circuit card) side.
5.
Carefully insert the new spindle motor into the chassis, install a new spindle
motor by reversing the procedures described in steps 2 through 5. Ensure the
new spindle is parallel to the chassis.
Note:
Use extreme caution to avoid scratching the surfaces of the spindle.
6.
Adjust the collet assembly (paragraph 4.4.1).
7.
Check the write protect sensor (paragraph 4.4.4).
B.
Check disk rotational speed (paragraph 4.4.5).
9.
Inspect and adjust track alignment (paragraph 4.4.10).
10. Inspect and adjust Index burst timing (paragraph 4.4.13).
11. Install the shield cover assembly.
TS-021-0130B7 ••• 01
4-32

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