HP ProBook 4545s Notebook PC Maintenance and Service Guide

Fan
Description Spare part number
Fan 646285-001
Before removing the fan, 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. Metal heat shield (see
Metal heat shield on page 51).
Remove the fan:
1. Position the computer upside-down with front towards user.
2. Disconnect the fan cable (1) from the system board.
3. Remove the single Phillips PM2.5×6.0 screw (2) that secures the fan to the system board.
4. Rotate and lift the fan (3) from the system board.
Reverse this procedure to install the fan.
NOTE: To properly ventilate the computer, allow at least a 7.6-cm (3-in) clearance on the left side of
the computer.
The computer uses an electric fan for ventilation. The fan is controlled by a temperature sensor and is
designed to turn on automatically when high temperature conditions exist. These conditions are
Component replacement procedures 53