22
Installing Upgrade CPUs
The 586ITB is equipped with a 321-
pin Zero Insertion Force (ZIF)
socket at location U37 of the sys-
tem board. This socket is designed
for easy removal of an old CPU
and easy insertion of an upgrade
CPU. The ZIF socket allows you to
carefully place the new CPU into its
position. If you need to apply ex-
cessive force to insert the CPU,
you are not installing the CPU cor-
rectly.
Warning:
Open the socket only if you are actually installing a CPU. The warranty
on the original CPU will be voided if the S/N seal is broken. Before
proceeding with the upgrade, take note of the following. The micropro-
cessor and heatsink may be hot if the system has been running. To
avoid the possibility of a burn, power the system off and let the proces-
sor and heatsink cool for 20 minutes.
The 321-pin ZIF socket consists of five rows of pin holes on each side.
To prevent improper CPU installation, the ZIF socket has a Plug/Keying
mechanism. Several holes in the socket are plugged so that the CPU
will go in only one way. If you cannot easily insert the CPU, verify that
pin 1 of the CPU is aligned with pin 1 of the socket.
Zero Insertion Force (ZIF) Socket
