Acer TravelMate 4220 TravelMate 4520/4220, Extensa 4420/4120 Service Guide - Page 61
M2 x L4 BZN+NYLOK, Detach the fingerprint board bracket from the upper case.
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5. Remove the screws securing the fingerprint board bracket. Step 5 Type M2 x L4 BZN+NYLOK Quantity 4 Color Silver Torque 1.6 kgf-cm +/-15% 6. Detach the fingerprint board bracket from the upper case. 7. Remove the screws securing the fingerprint board. Step 7 Type M2 x L4 BZN+NYLOK Quantity 2 Color Silver Torque 1.6 kgf-cm +/-15% Chapter 3 51