Lenovo ThinkPad Edge E420s (English) User Guide - Page 100

Replacing memory

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4. Close the computer display, and turn the computer over. Reinstall the two screws. 5. Turn the computer over again. Connect the ac power adapter and cables to the computer; then turn it on. Replacing memory Before you start, print these instructions. To replace memory, read the following prerequisites, and then the instruction. Note: The operating speed of the memory module depends on the system configuration of your computer and its combination with the memory module installed on your computer. In some conditions, the memory in your computer may not be able to operate at the maximum speed. Attention: Before you start installing a module, touch a metal table or a grounded metal object. This action reduces any static electricity from your body. The static electricity could damage the SO-DIMM. Replacing memory in the slot under the keyboard 1. Turn off the computer; then disconnect the ac power adapter and all cables from the computer. 2. Enter ThinkPad Setup to stop battery discharge. Refer to "Before replacing CRU" on page 75 for detailed information. 3. Close the computer display, and turn it over. 4. Remove the keyboard. For more details, refer to "Replacing the keyboard" on page 78. 82 User Guide

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4. Close the computer display, and turn the computer over. Reinstall the two screws.
5. Turn the computer over again. Connect the ac power adapter and cables to the computer; then turn it on.
Replacing memory
Before you start, print these instructions.
To replace memory, read the following prerequisites, and then the instruction.
Note:
The operating speed of the memory module depends on the system configuration of your computer
and its combination with the memory module installed on your computer. In some conditions, the memory in
your computer may not be able to operate at the maximum speed.
Attention:
Before you start installing a module, touch a metal table or a grounded metal object. This action
reduces any static electricity from your body. The static electricity could damage the SO-DIMM.
Replacing memory in the slot under the keyboard
1. Turn off the computer; then disconnect the ac power adapter and all cables from the computer.
2. Enter ThinkPad Setup to stop battery discharge. Refer to “Before replacing CRU” on page 75 for
detailed information.
3. Close the computer display, and turn it over.
4. Remove the keyboard. For more details, refer to “Replacing the keyboard” on page 78.
82
User Guide