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System Upgrade Procedure 13
Replacing the Clock Board
The clock board is located at the top rear of the system, below the peripheral power
supply. After replacing the clock board, update the system flash PROM as shown in
“Updating the System Flash PROM” on page 14.
Note – The TOD/NVRAM chip must be removed from the old clock board and installed
on the upgrade clock board since it contains the host ID and Ethernet ID.
1. Loosen the two captive screws securing the clock board to the system chassis.
2. Pull the ends of both extraction levers outward simultaneously to release the
board from the centerplane receptacles (
FIGURE 10).
3. Place the clock board on a padded ESD mat.
Caution – Use a grounding wrist strap when handling the TOD/NVRAM chip.
.
FIGURE 10 Clock Board and TOD/NVRAM Location
!
TOD/NVRAM
Captive screw
Extraction lever