Base enclosure
IMPORTANT: Make special note of each screw and screw lock size and location during removal and
replacement.
Description Spare part number
Base enclosure
For 14" products 840657-001
For 15" products 840725-001
Before removing the base enclosure, follow these steps:
1. Shut down the computer.
2. Disconnect all external devices connected to the computer.
3. Disconnect the power from the computer by rst unplugging the power cord from the AC outlet and then
unplugging the AC adapter from the computer.
4. Remove the following components:
a. Service door (see Service door on page 37).
b. Remove the battery (see Battery on page 38)
c. Hard drive (see Hard drive on page 39).
d. Solid-state drive (see Solid-state drive (select products only) on page 41).
e. WWAN module (see WWAN module (select products only) on page 42).
f. WLAN module (see WLAN module on page 43).
g. Optical drive (see Optical drive on page 45).
h. Keyboard (see Keyboard on page 47).
i. Memory (see Memory on page 50).
j. Hinge covers (see Hinge cover on page 53).
Remove the base enclosure:
1. Disconnect the ngerprint reader cable (1), the speaker cable (2), the display cable (3), and the pointing
stick cable (4).
Component replacement procedures 55
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