HP EliteBook 8470w Maintenance And Service Manual page 24

Item
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16 Chapter 2 External component identification
Component
Embedded numeric keypad
num lk key
Description
When the keypad is turned on, it can be used like an
external numeric keypad.
Each key on the keypad performs the function indicated
by the icon in the upper-right corner of the key.
Turns the embedded numeric keypad on and off when
pressed in combination with the fn key.