Acer Extensa 4420 TravelMate 4520/4220, Extensa 4420/4120 Service Guide - Page 58
M2.5 x L4 BZN+NYLOK, Turn the unit over again and remove the single top upper case screw.
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t LED board cable (LEDB1) 2. Turn the unit over to the base side. 3. Remove the lower case screws securing the upper case. Step 3 Type M2.5 x L4 BZN+NYLOK Quantity 11 Color Black Torque 3 kgf-cm +/-15% 4. Turn the unit over again and remove the single top upper case screw. Step 4 Type M2.5 x L4 BZN+NYLOK Quantity 1 Color Silver Torque 3 kgf-cm +/-15% 48 Chapter 3