Dell Precision M20 - Manual (Page 82)

Internal Card With Bluetooth® Wireless Technology
If you ordered an internal card with Bluetooth wireless technology with your computer, it is already installed.
1. Remove the battery.
2. Open the card door.
3. Using a plastic scribe or screwdriver, gently pry the module from the plastic guide bracket and the compartment so that you can disconnect the card from
its cable and remove it from the computer.
1 M2.5 x 6-mm screws (2)
2 keyboard connector pull-tab
3 keyboard tabs
4 palm rest
CAUTION: Before performing the following procedures, read the safety instructions in your Product Information Guide.
NOTICE: To avoid electrostatic discharge, ground yourself by using a wrist grounding strap or by periodically touching a connector on the back panel of
the computer.
NOTICE: To avoid damaging the system board, you must remove the main battery before you begin working inside the computer.
1 card connector
2 card
3 door