HP ProBook 640 G1, 645 G1, 650 G1, and 655 G1 Notebook PCs - Maintenance and Service Guide

6 Removal and replacement procedures for
Authorized Service Provider parts
CAUTION: Components described in this chapter should only be accessed by an authorized service provider.
Accessing these parts can damage the computer or void the warranty.
Fan and heat sink assembly
NOTE: The fan and heat sink assembly spare part kit includes replacement thermal material.
Description Spare part number
Fan 738685-001
Heat sink for computer models with Intel UMA graphics memory 738686-001
Heat sink for computer models with discrete graphics 738393-001
Before removing the fan and heat sink assembly, follow these steps:
1. Turn off 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 the power from the computer by unplugging the power cord from the computer.
3. Disconnect all external devices from the computer.
4. Remove the battery (see Battery on page 56), and then remove the following components:
a. Service cover (see Service cover on page 57)
b. Hard drive (see Hard drive on page 58)
c. Optical drive (see Optical drive on page 69)
d. Keyboard (see Keyboard on page 72)
Remove the fan:
1. Disconnect the fan cable (1) from the system board, loosen the two captive screws (2), and then
remove the fan (3).
Fan and heat sink assembly 79