Sony VPCSA Series - Manual (Page 89)

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Using Your VAIO Computer >
Using Fingerprint Authentication
If you have failed to register a fingerprint, follow these steps to try again.
1 Place the top joint of your finger flat in the center of the fingerprint sensor (1).
2 Swipe your finger perpendicularly across the fingerprint sensor and scan from the top joint of the finger to the fingertip.