Thecus Technology 1U4500R - Manual (Page 56)

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Replacing a Failed Power Supply (1U4500R)
The 1U4500R is equipped with a 250W redundant power supply. If one of the
power supply units fails, the other can continue powering the unit for
uninterrupted service. Each power supply is equipped with an LED light that is lit
when that power supply is operational. To replace a failed power supply, follow
the steps below:
1. When a power supply fails, an alarm will sound and/or an email
notification is sent to specified receivers.
2. Check the power supply LEDs to see which one has failed.
3. Disconnect the power cable.
4. Remove the mounting screw and slide out the failed power supply.
5. Install a working power supply unit and replace the screw.
6. Plug in the power cable.
7. The system automatically recognizes the power supply and will turn off the
alarm. Check to see if the LED on the new power supply is lit.
To turn of the alarm at any time, simply press the Alarm Reset button at the back
of the 1U4500R.