Aaeon SBC-555 Manual page 21

Warning! Always completely disconnect the power cord
from your chassis whenever you are working on
it. Do not make connections while the power is
on because sensitive electronic components can
be damaged by the sudden rush of power. Only
experienced electronics personnel should open
the PC chassis.
Caution! Always ground yourself to remove any static
charge before touching the CPU card. Modern
electronic devices are very sensitive to static
electric charges. Use a grounding wrist strap at
all times. Place all electronic components on a
static-dissipative surface or in a static-shielded
bag when they are not in the chassis.
The SBC-554V CPU card supports most Pentium and its compati-
ble CPUs. The system's performance depends on the CPU you
choose. You can install or upgrade the CPU in the board's PGA
socket by following the procedures outlined below. If your
system has an existing CPU, you need to remove it before
installing the new CPU.
1. Disconnect power from the chassis, and unplug all connec-
tions to the CPU card. Then, remove the CPU card from the
chassis by following the instructions in the user's manual for
your chassis.
2. Lift the CPU out of the PGA socket. The old chip may be
difficult to remove. You may find spray chip lubricant,
designed for pin-grid-array (PGA) devices, and a chip puller
helpful. These are available at electronics hobbyists' supply
stores.