HP KS159UT HP 550 Notebook PC - Maintenance and Service Guide - Page 56

Switch cover, that secure the switch cover to the computer.

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Reverse this procedure to reassemble and install an optical drive. Switch cover Description Switch cover (includes button board and cable) Spare part number 495388-001 Before removing the switch cover, 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 39). Remove the switch cover: 1. Turn the computer upside down, with the rear panel toward you. 2. Remove the two slotted Torx T8M2.5×9.0 screws (1) and the three Torx T8M2.5×3.0 broadhead screws (2) that secure the switch cover to the computer. 3. Turn the computer right-side up, with the front toward you. 4. Open the computer as far as possible. 5. Release the ZIF connector to which the button board cable (1) is attached, and disconnect the cable from the system board. 48 Chapter 4 Removal and replacement procedures

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Reverse this procedure to reassemble and install an optical drive.
Switch cover
Description
Spare part number
Switch cover (includes button board and cable)
495388-001
Before removing the switch cover, 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
39
).
Remove the switch cover:
1.
Turn the computer upside down, with the rear panel toward you.
2.
Remove the two slotted Torx T8M2.5×9.0 screws
(1)
and the three Torx T8M2.5×3.0 broadhead
screws
(2)
that secure the switch cover to the computer.
3.
Turn the computer right-side up, with the front toward you.
4.
Open the computer as far as possible.
5.
Release the ZIF connector to which the button board cable
(1)
is attached, and disconnect the
cable from the system board.
48
Chapter 4
Removal and replacement procedures