The Base Asse~Bly - HP Integral Personal Computer Service Manual

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6.12 The Base Assembly
The base assembly forms the metal substructure of the computer. It includes the I/O backplane as-
sembly, HP-IB ribbon-cable assembly, and power supply.
6.12.1 Removing the
a.s.
Assembly
Before you can work on the I/O backplane assembly, HP-IB ribbon-cable assembly, or power supply,
you must remove the base assembly from the computer. Follow these steps:
1.
Remove the back case (refer to section 6.5). l!nsnap the white button on the clear ESO shield in
the upper right-hand comer (see figure 6-3).
2. Remove the disc drive assembly (refer to section 6.10, steps 1 through 4).
3. Close the computer lid
(if
present) and latch it.
Note:
If you intend to remove either the left-side-support assembly (the fan housing) or the
right-side-support assembly, you must remove the lid assembly (refer to section 6.6) before
you proceed. Otherwise, latch the lid assembly in the closed position.
4. Remove both I/O port covers.
5. Remove the 5.S-mm grounding nut accessible through the hole in the I/O PCA (see figure 6-29a) .
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8.
Remove the six screws holding the logic A shield (see figure 6-3) and remove the shield. (Leave
the logic A PCA in place.)
7. Remove the six screws holding the PCA mounting panel (see figure 6-5).
8.
Tilt the panel down and toward you (unhook the cable clip from the printer-mechanism cables).
Support the panel to prevent any strain on the cables.