Toshiba Portege R300 Maintenance Manual page 278

4 Replacement Procedures
Installing the Heat sink / CPU plate / CPU
To install the heat sink (only dual core model) or CPU plate (only single core model) /CPU,
follow the steps below and refer to Figure 4-37 to Figure 4-39.
1. Seat the CPU in the CPU socket. Make sure the direction and position of CPU is
correct to avoid damaging pins on the CPU.
CAUTION: Place the CPU in such direction as shown below. (Pay attention to the
position of the triangle mark on the CPU.)
2. Fix the CPU by turning the cam on the CPU socket by 90 degrees clockwise with a
flat-blade screwdriver (in the order shown in the figure below).
3. Apply new grease on the CPU using a special syringe as shown in the following
figure. Apply quarter of scale (0.25ml) of grease evenly on the CPU chip. When
silicon grease is already applied to the CPU, wipe them off with a close in advance.
CAUTION: When installing the CPU, apply new grease on the top of the CPU chip. When
installing the fin, make sure the bottom of the fin covers the top of the CPU.
4. Place the CPU holder and the heat sink (only dual core model) or CPU plate (only
single core model) and secure it with the following screws in the order of the number
marked on the CPU holder or CPU plate.
• M2×4BS
CAUTION: Tighten the screws in the order of mark "1", "2" and "3" on the CPU holder.
4-46 [CONFIDENTIAL]
Figure 4-39 Applying new grease
S-THIN HEAD
PORTÉGÉ R300 Maintenance Manual (960-591)
4.23 Heat sink / CPU plate / CPU
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