Fujitsu M255XK Customer Engineering Manual page 59

4.5 REMOVAL AND REPLACEMENT PROCEDURES
The following step-by-step procedures explain the removal and replacement of
assemblies within the disk drive.
4.5.1 Head Carriage Replacement
Tools Required: Phillips Screwdriver, M3
Phillips Screwdriver, M2.6
Tweezers
Alcohol and Gauze
Screw Lock Liquid
Figure 4-23 is an overview drawing and Figure 4-24 shows Head Cable Routing.
1.
Remove the cover screws and the shield cover (Figure 5-5, item 44).
2. Remove the mounting screws and lift up the main circuit card assembly
(Figure 5-5, item 43).
3. Disconnect all cable connectors at the main circuit card and remove the card.
4. Remove the head cable from its cable clamp, refer to Figure 4-25A through
4-25C.
5. Remove the two mounting screws and take out the Bail Assembly (Figure 5-5,
item 22). Fasten the Bail Assembly with a felt pad so it does not contact the
upper or lower read/write head.
6. There are two fixing plates connecting the head carriage assembly and the
steel band assembly. Grasp fixing plate B (Figure 5-5, item 12) and the head
carriage (Figure 5-5, item 7) with your fingers and push to disengage the steel
band from band fixing plate B
7,. Detach fixing plate B and the steel band spring (Figure 5-5, item 13) from
the head carriage and remove them at the same time.
8. Remove the pulley screw (Figure 5-5, item 56) from the stepping motor,
remove the band washer (Figure 5-5, item 14) and then the steel band.
9. Remove the 4 mounting screws and the guide shaft clips (Figure 5-5, item 10)
that are holding the two guide shafts (Figure 5-5, items 8 and 9) in place, and
then remove the guide shafts.
10. Prepare the new head carriage assembly and the two new guide shafts.
The guide shafts and head carriage assembly must always be replaced as a
single assembly.
11.
Fit the guide shafts into their grooves on the chassis, using the guide shaft
clips.
12. Install the head carriage assembly by reversing step 9.
TS-021-013087 ••• 01 4-27