IBM 8668 Hardware Maintenance Manual - Page 81
Hot-swap power supply installation, AC power LED
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AC power LED This light provides status information about the power supply. During typical operation, the ac power LED is on. See "Power supply LED errors" on page 116 for more information. DC power LED This light provides status information about the power supply. During typical operation, the dc power LED is on. See "Power supply LED errors" on page 116 for more information. Statement 8: CAUTION: Never remove the cover on a power supply or any part that has the following label attached. Hazardous voltage, current, and energy levels are present inside any component that has this label attached. There are no serviceable parts inside these components. If you suspect a problem with one of these parts, contact a service technician. Hot-swap power supply installation On models that use the 250-watt power supply configuration, you can add a third 250-watt power supply to ensure complete power redundancy. After you install a power supply, verify that the power-supply status indicators (ac power light and dc power light) are lit, indicating that the power supply is operating properly. Notes: 1. You do not need to turn off the power to the server to install hot-swap power supplies. 2. The illustrations in this document might differ slightly from your hardware. Installing options 73