Aaeon SBC-551 Manual page 22

The SBC-551/552 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 connections
to the CPU card. Then, remove the CPU card from the chassis
by following the instructions in the user 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.
To install the CPU, follow the instructions that came with it. If no
documentation was provided, the general procedures for installing
a CPU are outlined below:
1. Lubricate the pins on the CPU with lubricant for PGA devices.
This makes the CPU slide in much easier and greatly reduces
the chance of damaging the pins and other components.
2. Carefully align the CPU so that it is parallel to the socket. Make
sure that the notch on the corner of the CPU matches the notch
on the inside of the socket.
3. Gently push the CPU into the socket. There will probably be a
small gap between the CPU and the socket even when it is fully
seated. Do not use execessive force !
When you install a new CPU, you may have to adjust other
settings on the board, such as CPU type, CPU clock, and PCI
speed, in order to accommodate it. Make sure that the settings are
correct for your CPU. Improper settings may damage the CPU.
14 SBC-551/552 User Manual