Acer TravelMate 4220 TravelMate 4520/4220, Extensa 4420/4120 Service Guide - Page 64
Removing the System Board, Detach the system board from the upper case
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Removing the System Board 1. Disconnect the speaker cable from its system board connector (SPKR1). 2. Remove the single screw securing the system board to the lower case. Step 2 Type M2 x L4 BZN+NYLOK Quantity 1 Color Silver Torque 1.6 kgf-cm +/-15% 3. Detach the system board from the upper case, then turn it over to gain access to the modem board. Proceed to the next section for instructions on how to remove the modem board. 54 Chapter 3