3Com 3C63311 Reference Guide - Page 9

WARNING INFORMATION Servicing Rack Mounting This section contains warning information for AC-powered systems. CAUTION: Use of controls or adjustments of performance or procedures other than those specified herein may result in hazardous radiation exposure. CAUTION: Danger of explosion if battery is incorrectly replaced. Replace the battery with only the same or equivalent type as that recommended by the manufacturer. Dispose of used batteries according to the manufacturer's instructions. Service of this unit is to be performed by qualified service personnel only. Service of certain components and subassemblies in this equipment is accomplished by the replacement of Field Replaceable Units (FRUs). However, safety agency approval requires that the servicing of other subassemblies within this product be referred to 3Com's service personnel. The trim enclosure and other mechanically secured plates serve as protection barriers from potential hazardous internal areas. No attempt should be made to troubleshoot internal components with these protective barriers removed without first disconnecting the equipment from main power. This equipment is for use only in complete equipment where the acceptability of the combination is determined by the applicable safety agency in the country in which it is installed. This includes UL in the U.S.A., CSA in Canada, and TUV in Europe. CAUTION: Do not block the ventilation openings on the top and bottom of the unit during installation. A minimum of 1 rack unit (1.75") space is required. Rack configurations with certain combinations of 3Com equipment installed in racks with a height greater than 50" (127 cm) may require a counter-balance weight, a stabilizer bar, or anti-tip legs to ensure rack stability in accordance with safety agency regulations. CAUTION: When attaching the rack-mount ears, you must use the factory-supplied screws. Using screws other than those supplied with the rack-mount ears voids your warranty and could damage the PCB.