HP ProBook 4740s Notebook PC Maintenance and Service Guide

RTC battery
Description Spare part number
RTC battery 683502-001
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 40).
5. Remove the following components:
a. Bottom door (see
Bottom door on page 41).
b. Hard drive (see
Hard drive on page 45)
c. Optical drive (see
Optical drive on page 43)
d. WLAN/Bluetooth module (see
WLAN/Bluetooth combo card on page 50)
e. Keyboard (see
Keyboard on page 52)
f. Top cover (see
Top cover on page 54)
g. Fan (see
Fan on page 64)
h. System board (see
System board on page 70)
Remove the RTC battery:
1. Position the computer upright and open as far as possible.
2. Disconnect the RTC battery connector from the system board (1).
Component replacement procedures 73