Compaq 420 Compaq 320, 321, 420, 421, 620 and 621 Notebook PCs HP 420 and 620 - Page 90

Power switch board, and then unplugging the AC adapter from the computer.

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6. Rotate the top cover up (1) and off the base enclosure (2). Reverse this procedure to install the top cover. Power switch board The spare part number for the power switch board used in all models is 605794-001. Before removing the power switch board, 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 53). 5. Remove the service door (see Service door on page 53). 6. Remove the keyboard (see Keyboard on page 73). 82 Chapter 4 Removal and replacement procedures

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6.
Rotate the top cover up
(1)
and off the base enclosure
(2)
.
Reverse this procedure to install the top cover.
Power switch board
The spare part number for the power switch board used in all models is 605794-001.
Before removing the power switch board, 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
53
).
5.
Remove the service door (see
Service door
on page
53
).
6.
Remove the keyboard (see
Keyboard
on page
73
).
82
Chapter 4
Removal and replacement procedures