Mitsubishi Electric apricot ls/vs550 Owner's Handbook Manual page 46

S y s t e m m o t h e r b o a r d
To fit the upgrade processor
5/12 LS/VS550 OWNER'S HANDBOOK
1. Ensure that the securing lever on the ZIF socket is still in the
upright position.
2. Take the upgrade processor out of its anti-static packaging.
Hold the processor by its edges and avoid touching the metal
pins. The upgrade processor and the ZIF socket are keyed to
ensure that the processor is installed in the correct orientation.
(The pin pattern is totally different at one end.) It will only fit
into the socket one way.
3. Place the processor in the socket, making sure that it is
correctly aligned and that you do not bend or otherwise
damage the pins. Do not use excessive force.
4. Move the ZIF socket lever to the locked position. Apply just
enough pressure to overcome the resistance offered by the
lever. Ensure that it is firmly hooked into its down position.
5. Refit the heatsink if the new processor was supplied without
one and secure correctly the retaining spring. Ensure the
heatsink is central on the processor and is securely held.
◊ If the spring is no longer required, remove it completely by
disengaging it from its hook on the rear of the ZIF socket.
◊ The upgrade processor may have a fan power lead to be
connected to the pins on the board (PL73). The 'overdrive'
type processor however may have its own internal
connection for the fan power supply.
6. Now adjust the processor multiplier and external bus clock
speed links on the motherboard, (Jumpers 1-4 and 32) in
conjunction with the new processor's data sheet.
Warning Warning
Ensure that the supply lead for the front casing fan is still connected to
PL74 to ensure adequate airflow over the processor assembly.
This processor requires continuous airflow.
Return to their original position any expansion cards that had been
removed earlier, then refit and secure the system unit cover.