Lenovo 20BV001CGE User Manual page 133

DANGER
During electrical storms, do not perform any replacement and do not connect or disconnect the
telephone cable from the telephone outlet 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.
Attention: Before you start installing an M.2 wireless WAN card, touch a metal table or a grounded metal
object. This action reduces any static electricity from your body. Static electricity could damage the card.
Some computers might come with an M.2 wireless WAN card. To replace the wireless WAN card, do
the following:
1. Disable the built-in battery. See "Disabling the built-in battery" on page 107.
2. Close the computer display, and turn the computer over.
3. Remove the removable battery. See "Replacing the removable battery" on page 108.
4. Remove the base cover assembly. See "Replacing the base cover assembly" on page 111.
5. If a tool is provided with the new card to help you disconnect cables, use the tool to disconnect the
cables from the old card. If no such a tool is provided, hold the cable connector with your fingers and
gently disconnect each cable from the old card.
.
Chapter 9 Replacing devices
117