Digital Equipment Prioris HX590 DP, Service Maintenance Manual

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Digital PRIORIS HX590 & HX590 DP Server Service Procedures
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Replacing the CPU Chip
The CPU module is equipped with a two upgradeable ZIF sockets capable of supporting future higher
performance Pentium processors.
CAUTION
When replacing the CPU make sure the new chip is a 5V device. If only 3.3V devices are
available see “To set CPU voltage to 3.3V”.
To replace the CPU:
1) Remove the CPU module.
2) Place the CPU module on an anti-static surface.
3) Lift up on the release lever for the ZIF socket.
4) Remove the CPU from the ZIP socket pulling it straight up.
5) Install the new CPU and return the release lever to its original position.
6) Set any appropriate jumpers.
7) Install and secure the CPU module to the main logic board.
NOTE Make sure pin 1 on the CPU is aligned with pin 1 on the ZIF socket (A, Figure 3 - 10).
Pin 1 is located at the notched corner of the CPU (You can see the notched corner by
looking at the CPU from the pin side). Also, the CPU is keyed so it cannot be installed
incorrectly.
Figure 3 - 10 Replacing the CPU Chip