HP EliteBook 8770w Mobile Workstation Maintenance and Service Guide

3. Rotate the security lock away from the base enclosure and remove the security lock from the
base enclosure (2).
Reverse this procedure to install the security lock.
Processor heat sink
Description Spare part number
For use only with computer models equipped with quad-core processors 653629-001
For use only with computer models equipped with dual-core processors 652542-001
Before removing the processor heat sink, 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 51)
5. Remove the service access cover (see
Service access cover on page 52).
6. Remove the optical drive (see
Optical drive on page 63) or upgrade bay hard drive (see Upgrade
bay hard drive on page 66).
7. Remove the keyboard (see
Keyboard on page 71).
8. Remove the top cover (see
Top cover on page 83).
9. Remove the fan/graphics board heat sink assembly (see
Fan/graphics board heat sink assembly
on page 75).
110 Chapter 4 Removal and replacement procedures