1. Release the ZIF connector (1) to which the power button board cable is attached, then disconnect
the power button board cable from the audio/USB board.
2. Remove the Phillips PM2.0×4.6 screw (2) that secures the power button board to the base enclosure.
3. Release the power button board (3) by sliding it forward.
4. Remove the power button board (4).
Reverse this procedure to install the power button board.
RTC battery
Description Spare part number
RTC battery (includes cable and double-sided adhesive) 691572-001
Before removing the RTC battery, 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 keyboard/top cover (see Keyboard/top cover on page 34).
5. Remove the battery (see Battery on page 42).
6. Remove the audio/USB board (see Audio/USB board on page 46).
Remove the RTC battery:
1. Disconnect the RTC battery cable (1) from the system board.
48 Chapter 5 Removal and replacement procedures for authorized service provider parts
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