HP EliteBook 840 G1 Notebook PC - Manual (Page 22)

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Component Description
(1) Service door Provides access to the hard drive bay, the
wireless LAN (WLAN) module slot, the WWAN
module slot, and the memory module slots.
CAUTION: To prevent an unresponsive
system, replace the wireless module only with
a wireless module authorized for use in the
computer by the governmental agency that
regulates wireless devices in your country or
region. If you replace the module and then
receive a warning message, remove the
module to restore computer functionality, and
then contact support through Help and
Support.
12 Chapter 2 Getting to know your computer