Dell Precision M20 - Manual (Page 74)

2. Turn off your computer .
3. If the computer is connected to a docking device (docked), undock it. See the documentation that came with your docking device for instructions.
4. Disconnect any telephone or network cables from the computer.
5. Close the display and turn the computer upside down on a flat work surface.
6. Disconnect your computer and all attached devices from their electrical outlets, slide and hold the battery-bay latch release on the bottom of the
computer and remove the battery from the bay, and then press the power button to ground the system board.
7. Remove any installed PC Cards from the PC Card slot.
8. Remove any installed modules, including a second battery, if installed.
9. Remove the hard drive .
Memory
You can increase your computer memory by installing memory modules on the system board. See " Specifications " for information on the memory supported by
your computer. Install only memory modules that are intended for your computer.
Your computer has two user-accessible SODIMM sockets, one accessed from beneath the keyboard (DIMM A), and the other accessed from the bottom of the
computer (DIMM B).
To add or replace a memory module in the DIMM A connector:
1. Follow the procedures in " Before You Begin ."
2. Remove the keyboard .
NOTICE: To disconnect a network cable, first unplug the cable from your computer and then unplug it from the network wall jack.
NOTICE: To avoid damaging the system board, you must remove the main battery before you service the computer.
CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide.
NOTICE: If your computer has only one memory module, install the memory module in the connector labeled "DIMMA."
NOTICE: If you remove your original memory modules from the computer during a memory upgrade, keep them separate from any new modules that
you may have, even if you purchased the new modules from Dell. If possible, do not pair an original memory module with a new memory module.
Otherwise, your computer may not function at optimal performance.
NOTE: Memory modules purchased from Dell are covered under your computer warranty.
1 memory module (DIMM A)