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2. Gently hold down the media card reader board (2), and remove the RTC battery (3).
NOTE: The RTC battery is attached to the system board by foam material rather than double-
sided adhesive.
Reverse this procedure to install the RTC battery on computer models. When installing the RTC
battery, make sure the “+” sign faces up.
Memory module
Description Spare part number
4-GB memory module (PC3, 12800, 1600-MHz) 641369-005
2-GB memory module (PC3, 12800, 1600-MHz) 652972-005
8-GB memory module (PC3, 12800, 1600-MHz) 670034-005
Before removing a 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 display panel (see
Display panel on page 39).
50 Chapter 4 Removal and replacement procedures