Chapter 4 177
Assembly Replacement
A4 Disk Drive and A5 Disk Drive Board
A4 Disk Drive and A5 Disk Drive Board
CAUTION Use ESD precautions when performing this replacement procedure.
NOTE The disk drive assembly consists of the A4 disk drive and the A5 disk
drive board. These are removed from the instrument as a unit, but they
can be replaced separately.
Removal
1. Remove the instrument top brace. Refer to the “Top Brace” removal
procedure.
2. Remove the front frame. Refer to the “Front Frame” removal
procedure.
3. Remove the A17, A18, and A19 assemblies. Refer to “A17 RF, A18
Reference, and A19 Synthesizer Assemblies” removal procedure.
4. Unplug the ribbon cable from the motherboard.
5. Refer to Figure 4-5. Using the T-10 driver, remove the 4 screws (1)
that attach the disk drive cover (2) to the deck.
6. Unplug the flat flex cable from the motherboard and the disk drive
connectors. It is necessary to unlock these connectors before
removing this cable.
7. Remove the disk drive assembly by sliding it forward out of the disc
shield.
8. To separate the disk drive board from the disk drive, refer to
Figure 4-6. Remove the top part of the disk drive mount (1). The
disk drive (2) and the disk drive board (3) can now be lifted out of
the bottom part of the mount (4).
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