HP ProBook 4545s Notebook PC Maintenance and Service Guide

h. Top cover (see Top cover on page 58).
i. System board (see
System board on page 70).
Remove the RTC battery:
1. Position the system board upside-down with the front toward you.
2. Use a screwdriver to loosen the battery from the slot (1).
3. Lift the battery from the system board (2).
Reverse this procedure to install the RTC battery.
Power cable
The power cable is included in the Cable Kit, spare part number 683477-001.
Before removing the power cable, 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. Bottom door (see
Bottom door on page 38).
b. Hard drive (see
Hard drive on page 45).
c. Optical drive (see
Optical drive on page 41).
d. Metal heat shield (see
Metal heat shield on page 51).
74 Chapter 4 Removal and replacement procedures