Lenovo T420 User Manual
9. Put the memory slot cover back in place (1), close the cover (2), and then tighten the screw (3).
10. Reinstall the battery. For more information about how to reinstall the battery, refer to the instructions in
11. Turn the computer over again. Connect the ac power adapter and cables to the computer; then turn it on.
Installing and replacing a PCI Express Mini Card for wireless LAN/WiMAX
connection
connection
Before you start, print these instructions.
Your computer has a PCI Express Mini Card slot for connection to a wireless LAN/WiMAX. To replace the PCI
Express Mini Card with a new one, read the following prerequisites.
Express Mini Card with a new one, read the following prerequisites.
Prerequisites for the procedure
DANGER
During electrical storms, do not connect the cable to or disconnect it from the telephone outlet
on the wall.
on the wall.
DANGER
Electric current from power, telephone, and communication cables is hazardous. To avoid shock
hazard, disconnect the cables before opening the cover of this slot.
hazard, disconnect the cables before opening the cover of this slot.
Attention: Before you start installing a PCI Express Mini Card, touch a metal table or a grounded metal
object. This action reduces any static electricity from your body. The static electricity could damage the card.
object. This action reduces any static electricity from your body. The static electricity could damage the card.
Replacing a PCI Express Mini Card with two connectors
1. Turn off the computer; then disconnect the ac power adapter and all cables from the computer. Wait for
a few minutes, till the inside of the computer cools, before you start the following procedures.
2. Close the computer display, and turn the computer over.
3. Remove the battery. For more information about how to remove the battery, refer to “Replacing the
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User Guide