4 Replacement Procedures 4.20 Fan/Heat sink/CPU
4. If there is already silicon grease on the CPU and heat sink, clean it with a cloth.
Using a special applicator, apply silicon grease (DENKA GFC-F1) so that the CPU
chip on the CPU is completely covered.
Figure 4-36 Applying silicon grease
5. Place the fan on the heat sink and secure them with the following screws.
• M2.5×4.0B FLAT HEAD screw ×2
6. Set the fan hood in place.
7. Stick a new cooling sheet in place.
CAUTION: Do not apply silicon grease on the North bridge.
8. Place the heat sink on the CPU and North bridge and secure it with the following
screws.
• M2.0×4.0B BIND screw ×2
9. Connect the fan cable to the connector CN8771 on the system board.
CAUTION: Do not put the fan cable on the fan.
10. Set the metal plate and CPU hold plate in place and secure them with the following
screws.
• M2.0×4.0B BIND screw ×3
CAUTION: Tighten the screws in the order of the number marked on the CPU hold
plate.
4-60 [CONFIDENTIAL] PORTÉGÉ M700/M750 Maintenance Manual (960-661)
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