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4. Remove the WWAN module (4) by pulling the module away from the slot at an angle.
NOTE: WWAN modules are designed with a notch (5) to prevent incorrect insertion.
Reverse this procedure to install a WWAN module.
Memory module
Description Spare part number
1 GB memory module (PC3 10600 1333 MHz, single channel) 639736-001
2 GB memory module (PC3 10600 1333 MHz, single channel) (select models only) 621565-001
Before removing the memory module, follow these steps:
1. Shut down the computer. If you are unsure whether the computer is off or in Hibernation, turn
the computer on, and then shut it down through the operating system.
2. Disconnect all external devices connected to the computer.
3. Disconnect the power from the computer by first unplugging the power cord from the AC outlet
and then unplugging the AC adapter from the computer.
4. Remove the battery (see
Battery on page 37).
5. Remove the service access cover (see
Service access cover on page 38).
Remove the memory module:
1. Pull away the retention clips (1) on each side of the memory module to release the module. (The
memory module tilts up (2).)
CAUTION: To prevent damage to the memory module, hold it by the edges only. Do not touch
the components on the memory module.
Component replacement procedures 43