User manual PACKARD BELL MAESTRO236D

[. . . ] exposure to hazardous voltage could cause personal injury. To avoid risk of injury, contact an Authorized Service Provider for proper (un)installation of optional hardware devices. WARNING Ensure that the computer is disconnected from its power source and from all telecommunications links, networks, or modem lines whenever the chassis cover is removed. Do not operate the computer with the cover removed. [. . . ] To do so, make sure your computer's power switch is OFF. Then, unplug the computer's AC power cord. Before picking up the device you (un)install, you should wear an antistatic wrist wrap (available at electronic supply stores). be sure to connect the wrist wrap to an unpainted metal portion of the computer chassis. As an alternative, you can dissipate electrostatic build-up by touching an unpainted metal portion of the computer chassis with one hand. Then touch the device you are (un)installing with the other hand, and maintain continuous contact with it until it is (un)installed in the computer. Under no circumstances should you attempt to disassemble the power supply. the power supply contains no user-serviceable parts. Inside the power supply are hazardous voltages that can cause serious personal injury. Always return a defective power supply to your dealer. Gently push the latch that fixes the rear bezel to the chassis and carefully pull the bezel away from the chassis. Press the two metal clips until the retention bracket unlocks and remove the bracket. Carefully take out the card from the slot. To remove the front USB port, first remove the rear bezel (see section Removing the Rear Bezel) and remove the left side cover (see section Removing the Left Side Cover), remove the front bezel (see section Removing the Front Bezel); then follow the steps below: 1. To remove the switch/LED assembly and the cable, first remove the rear bezel (see section Removing the Rear Bezel) and remove the left side cover (see section Removing the Left Side Cover), remove the front bezel (see section Removing the Front Bezel); then follow the steps below: 1. Unlock the housing by applying pressure on the latches on both sides of the switch/LED assembly. Gently pull away the cable and the switch/LED assembly from the chassis. Note: When reassembling the switch/LED assembly, take care that you return it to its original position, i. To remove the CPU, first remove the rear bezel (see section Removing the Rear Bezel) and remove the side cover (see section Removing the Left Side Cover); then follow the steps below: 1. Remove the CPU fan and heat sink by pressing the metal clip on both sides of the heat sink until unlocks. Be very careful not to remove any of the heat paste on the CPU surface!To remove the optional system fan, first remove the rear bezel (see section Removing the Rear Bezel), remove the left side cover (see section Removing the Left Side Cover); then follow the steps below: 1. [. . . ] To remove the power supply unit, first remove the rear bezel (see section Removing the Rear Bezel) and remove the side cover (see section Removing the Left Side Cover); then follow the steps below: 1. Place the chassis on its side, with the motherboard at the bottom. Disconnect the power supply cables from all peripherals and the motherboard. Remove the screws that secure the power supply unit to the back of the chassis. [. . . ]