Dell Vostro 3550 (Early 2011) - Manual (Page 47)

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Fingerprint Reader
Removing The Fingerprint Reader
1. Follow the procedures in Before Working On Your Computer
2. Remove the battery .
3. Remove the access panel .
4. Remove the keyboard .
5. Remove the palm rest .
6. Release the fingerprint-reader cable from the adhesive affixed to the palm
rest.
7. Remove the screw that secures the fingerprint-reader bracket.
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