HP ProDesk 400 G4 Desktop Mini PC Instrukcja Użytkownika Pobierz pdf (Strona 30)

17. Reconnect external devices, plug in the power cord, and then turn on the computer.

18. Lock any security devices that were disengaged when the access panel was removed.

Replacing the WLAN module

1. Remove/disengage any security devices that prohibit opening the computer.

2. Remove all removable media, such as a USB ash drive, from the computer.

3. Turn o the computer properly through the operating system, then turn o any external devices.

4. Disconnect the power cord from the AC outlet and disconnect any external devices.

CAUTION: Regardless of the power-on state, voltage is always present on the system board as long as

the system is plugged into an active AC outlet. You must disconnect the power cord to avoid damage to

the internal components of the computer.

5. Remove the access panel.

● For instructions on removing the access panel from a 35W model, see Removing the access panel

of the HP EliteDesk 800 35W on page 11.

● For instructions on removing the access panel from any other model, see Removing the access

panel on page 10.

WARNING! To reduce risk of personal injury from hot surfaces, allow the internal system components

to cool before you touch them.

6. If your model is an EliteDesk 800 95W, remove the fan assembly.

a. Disconnect the fan assembly plug (1) from the system board.

b. Loosen the three captive screws securing the fan assembly (2).

c. Lift the fan assembly out of the chassis (3).

24 Chapter 3 Hardware upgrades

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HP ProDesk 400 G4 Desktop Mini PC Instrukcja Użytkownika Strona 30