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CHAPTER 4 SERVICE PROCEDURE
4. Lift the CPU socket lever to release the CPU from the socket (see F04-404-04 on page
4-32).
5. Grasp the CPU by its edges and gently lift it from the socket.
4.4.3 TO REPLACE A CPU
1. Wipe the contact surface of the CPU with a clean, lint-free cloth to assure good contact
with the new heatsink.
If you removed the CPU from the motherboard in order to install it on a new
motherboard, make sure you completely remove any thermal compound residue on the
surface of the CPU and at the base of the heatsink.
2. Insert the CPU into the socket. Make sure you align the arrow indicating pin 1 on the
CPU with pin 1 in the CPU socket (see F04-404-04).
3. Lower the socket lever to secure the CPU.
4. At the base of the heatsink, remove the protective backing (if any) covering the thermal
compound.
If you are moving the original CPU and heatsink to a new motherboard,
first completely remove any thermal compound residue on the surface of
the CPU and at the base of the heatsink, and then apply a fresh thermal
compound square to the base of the heatsink.When installing the thermal
compound, make sure you squeeze out any air bubbles or wrinkles. Bubbles
and wrinkles reduce the heat-transfer efficiency of the cooling assembly.
4-32
F04-404-04 Replacing a CPU
COPYRIGHT © 2002 CANON INC.
Arrow
CPU clip
CPU
CPU pins
Pin 1
CPU socket
2000 2000 2000 2000
NM-PDL REV.0 JULY 2002
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