Acer Extensa 4420 TravelMate 4520/4220, Extensa 4420/4120 Service Guide - Page 42
Removing the Lower Case Cover, Removing the Memory Modules, M2 x L8 BZN+NYLOK, M2 x L4 BZN
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Removing the Lower Case Cover 1. Remove the screws securing the lower case cover. Step 1 Type M2 x L8 BZN+NYLOK M2 x L4 BZN Quantity 1 4 Color Black Black Torque 1.6 kgf-cm +/-15% 1.6 kgf-cm +/-15% 2. Pry the lower case cover from the main unit, then remove it. Removing the Memory Modules 1. Push out the latches on both sides of the exterior DIMM slot (DM1). 32 Chapter 3