HP ProBook 4520s Maintenance And Service Manual page 83

Before removing the processor, 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.
Disconnect all external devices connected to the computer.
2.
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 switch cover and keyboard (see
6. Remove the thermal shield (see
7. Remove the heat sink and fan (see
Remove the processor:
1. Position the computer right-side up with the front toward you.
2. Use a flat-bladed screwdriver to turn the processor locking screw (1) one-half turn
counterclockwise until you hear a click.
3. Lift the processor (2) straight up and remove it.
NOTE: When you install the processor, the gold triangle (3) on the processor must be aligned
with the triangle (4) embossed on the processor socket.
Battery on page 50).
Switch cover and keyboard on page
Thermal shield on page
Heat sink and fan on page
62).
69).
Component replacement procedures
51).
75