Acer TravelMate 4220 TravelMate 4520/4220, Extensa 4420/4120 Service Guide - Page 49
Removing the Heat Sink, M2 x L2.5 BZN+NYLOK
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4. Remove the cooling fan from the main unit. Removing the Heat Sink 1. Remove the screws securing the heat sink. Step 1 Type M2 x L2.5 BZN+NYLOK Quantity 5 Color Silver Torque 1.6 kgf-cm +/-15% 2. Carefully pull the heat sink from the unit base, then remove it from the system board. Chapter 3 39