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5. Replace the CPU cooling assembly.
Make sure the thermal compound on the base of the heatsink completely covers the
CPU chip. Incorrect installation could cause the CPU to overheat.
CPU fan
Heatsink clip lever
Heatsink clip
CPU heatsink
Notch
Front mounting post
F04-404-05 Replacing the CPU cooling assembly
6. Connect the CPU fan cable to the motherboard connector FAN1.
If you are installing a new CPU, secure the fan cable using a tie-wrap. The tie-wrap will
prevent the fan cable from interfering with the CPU fan. Also, make sure the connector
on the cable is securely connected to the motherboard.
7. Reassemble the iR-M2 (see page 4-13) and verify its functionality (see the connection
verification steps described on page 4-15).
COPYRIGHT © 2002 CANON INC.
2000 2000 2000 2000
NM-PDL REV.0 JULY 2002
CHAPTER 4 SERVICE PROCEDURE
• Align the notch on the bottom
of the heatsink so that it is di-
rectly over the rear mounting
post on the CPU socket.
• Place the heatsink on the
CPU so that the thermal com-
Tab
pound on the heatsink step
completely covers the CPU
Pin
chip.
• Align the pin on the heatsink
clip with the notch on the bot-
tom of the heatsink.
• First secure the clip over the
rear mounting post on the
CPU socket, then secure the
Step
clip over the front mounting
Rear
mounting post
post by pressing down on the
CPU socket
tab until the clip snaps into
place.
• Lower the heatsink clip lever.
• Place the CPU fan on top of
the heatsink and snap it into
place.
4-33
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