2-28AcerAltos 21000 System GuideThe power supply supplied with the systemaccepts input voltage of 100V~240V, 50~60Hz.To remove a power supply module:1. Detach the power cable from the electrical outlet and also fromthe power supply. The power indicator light turns off.2. Unscrew the screw knobs and carefully pull out the power supplyuntil it detaches from the housing.Make sure the power supply subsystem issupplying a minimum of 860W (2 power supplymodules) to the system.