Rtc Battery - Wwan Models - HP ProBook 450 G1 Maintenance And Service Manual

RTC battery – WWAN models
NOTE: RTC battery location varies on model with and without WWAN modules.
WWAN models: you must remove the system board to replace the RTC battery.
Non-WWAN models: you must remove only the service cover to replace the RTC battery.
Description
RTC battery for use in models with WWAN
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
5. Remove the following components:
a. Service door (see
b. Hard drive (see
c. Optical drive (see
d. WLAN/Bluetooth module (see
e. WWAN module (see
f. Keyboard (see
g. Top cover (see
h. System board (see
Remove the RTC battery:
1. Position the system board upside-down.
2. Disconnect the cable from the system board connector (1).
74 Chapter 6 Removal and replacement procedures for Authorized Service Provider parts
Battery on page 37).
Service door on page 38).
Hard drive on page 39)
Optical drive on page 42)
WLAN/Bluetooth combo card on page
WWAN module on page
Keyboard on page 50)
Top cover on page 54)
System board on page
48)
68)
Spare part number
721532-001
46)