Acer TravelMate 4220 TravelMate 4520/4220, Extensa 4420/4120 Service Guide - Page 38

System Screw List Listed below are the screw types used in this system, plus their corresponding part numbers. NOTE: The screws for the different components vary in size. During the disassembly process, group the screws with their corresponding components to avoid mismatches when putting back the components. Screw A B C D E F G H I J K L M Type M2 x L8 BZN+NYLOK M2 x L4 BZN M2.5 x L8 BZN+NYLOK M2 x L4 BZN+NYLOK M3 x L4 M2 x L3 BZN+NYLOK M2 x L2.5 BZN+NYLOK M2.5 x L12 BZN+NYLOK M2.5 x L4 BZN+NYLOK M2.5 x L6 BZN+NYLOK M2 X L2 NI M2.5 x L5 BZN+NYLOK M2.5 x L3 BZN+NYLOK Color Black Black Black Black Silver Black Black Silver Black Black Silver Black Black Part Number 86.00D75.220 86.00A02.140 86.00E34.738 86.00E13.524 86.9A554.4R0 86.00E25.723 86.00D72.620 86.00E67.63C 86.00D30.630 86.00E33.736 86.00D77.320 86.00F19.735 86.00D52.630 Pre-disassembly Procedure Before proceeding with the disassembly procedure, perform the steps listed below: 1. Turn off the power to the computer and all peripherals. 2. Unplug the power cord from the computer. 3. Unplug all peripheral cables from the computer. 4. Close the notebook lid and place the computer on a flat, steady surface. 28 Chapter 3