2-14AcerAltos 21000 System Guide2.2 Opening the Housing PanelsThe system housing has one front door and two side panels. Alwaysobserve the following ESD (electrostatic discharge) precautionsbefore installing any system component:1. Do not remove any system component from its packaging unlessyou are ready to install it.2. Wear a wrist grounding strap before handling electroniccomponents. Wrist grounding straps are available at mostelectronic component stores.DO NOT attempt the procedures in the followingsections unless you are confident of yourcapability to perform them. Otherwise, ask aservice technician for assistance.2.2.1 Removing the Left and Right PanelsA microswitch is allocated on the left side of the housing panel. Ithelps indicate whether the panel is removed or intact.To remove the left or right panel:1. Turn off the power to the system unit and unplug all cables.2. Place the system unit on a flat, steady surface and lock thewheels by pressing down the levers.3. Remove the screws of the left or right panel. Set the screwsaside. You will need them when replacing the panels.4. Pull out the panel and detach it.
