HP 4520S, 4720S manual Power button board

7.Remove the optical drive bracket (2).

Reverse this procedure to reassemble and install an optical drive.

Power button board

Description	Spare part number
Switch cover with power button board
For use in computers with 17.3-in displays	598675-001
For use in computers with 15.6-in displays and black or red trim	598674-001
For use in computers with 15.6-in displays and champagne-colored trim	626114-001

Before removing the power button 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 55).

5.Remove the switch cover and keyboard (see Switch cover and keyboard on page 56).

Component replacement procedures 63