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Bottom door
Description Spare part number
Bottom door for use in 4540s models 690978-001
Bottom door for use in 4440s/4441s models 690979-001
Before disassembling the computer, 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 battery (see
Battery on page 55).
Remove the bottom door:
1. Position the computer upside-down on a flat surface with the battery bay toward you.
2. With the battery bay toward you, remove the security screw (1) (if the security screw is being
used). For additional information about the security screw, see
Using the optional security screw
on page 57.
3. Slide the service door release latches (2) to release the service door.
NOTE: You can slide the service door release latches simultaneously or you can slide them
one at a time.
4. Slide the service door towards the front of the computer (3) and then lift it (4) away from the
computer.
Reverse the removal procedures to install the bottom door.
58 Chapter 4 Removal and replacement procedures