AC450NX Rack Server System Product Guide
156

PHP I/O Baseboard

CAUTION
The PHP I/O baseboard can be extremely sensitive to ESD and always
requires careful handling. After removing the baseboard from the server,
place it component-side up on a nonconductive, static-free surface to prevent
shorting out the battery leads. If you place the baseboard on a conductive
surface, the back-up battery leads may short out. If they do, this will result
in a loss of CMOS data and will drain the battery. Do not slide the
baseboard over any surface.

Removing the PHP I/O Bas eboard

See Figure 13-17.
1. Observe the precautions on page 115, “Safety Guidelines.”
2. Remove the top and PCI bus regular slot covers as described in Chapter 12, “Server Covers:
Removing/Reinstalling.”
3. Remove the I/O Tray as described earlier.
4. Remove the I/O riser card as described earlier.
5. Remove the ICMB board as described earlier.
6. Remove all PCI hot plug expansion slot power switch activators and covers.
7. Remove the add-in boards as described earlier.
8. Remove the plastic divider and base.
9. Remove and save the screws that attach the PHP I/O baseboard to the tray.
10. Pull the board toward you to unsnap it from the snap-on standoffs.
11. Place the board on a nonconductive, static-free surface, or store it in an antistatic protective
wrapper.

Reinstalling the PHP I/O Baseboard

See Figure 13-17.
1. Remove the PHP I/O baseboard from the antistatic protective wrapper if you placed it in one.
2. Position the baseboard over the snap-on and threaded standoffs on the center bulkhead of the
chassis.
3. Press the baseboard onto the snap-on standoffs and install the plastic divider and base.
4. Insert the screws loosely into the threaded standoffs.
5. Make sure the baseboard is properly seated, and tighten all screws firmly (8.0 inch-pounds).
6. Reinstall the I/O board as described earlier.
7. Reinstall the I/O riser card.
8. Reinstall the ICMB board as described earlier.
9. Connect all internal cables to the PHP I/O baseboard.
10. Reinstall the add-in boards in their original expansion slots as described earlier.
11. Connect all internal cables that go to the add-in boards installed in the expansion slots.