HP 540 HP 540 Notebook PC and HP 541 Notebook PC - Maintenance and Service Gui - Page 88
RTC battery
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RTC battery NOTE: Removing the RTC battery and leaving it uninstalled for 5 or more minutes causes all passwords and CMOS settings to be cleared. Description RTC battery Spare part number 449137-001 Before removing the RTC battery, 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 37). 5. Remove the following components: a. Hard drive (see Hard drive on page 38) b. Optical drive (see Optical drive on page 45) c. Keyboard (see Switch cover and keyboard on page 47) d. Switch cover (see Switch cover and keyboard on page 47) e. Speaker (see Speaker on page 51) f. Display lid switch module (see Display lid switch module on page 52) g. Display assembly (see Display assembly on page 53) h. Top cover (see Top cover on page 58) i. System board (see System board on page 66) Remove the RTC battery: 1. Turn the system board upside down, with the audio connectors toward you. 78 Chapter 4 Removal and replacement procedures