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Chapter 3: Maintenance and Component Installation
3.5 Power Supply
The AS -4023S-TRT has a redundant, hot-plug 1200 watt power supply consisting of two
power modules. Each power supply module has an auto-switching capability, which enables
it to automatically sense and operate at a 100V - 240V input voltage.
Power Supply Failure
If either of the two power supply modules fail, the other module will take the full load and allow
the system to continue operation without interruption. The Power Fail LED will illuminate and
remain on until the failed unit has been replaced. Replacement units can be ordered directly
from Supermicro. The hot-swap capability of the power supply modules allows you to replace
the failed module without powering down the system.
Replacing the Power Supply
You do not need to shut down the system to replace a power supply module. The redundant
feature will keep the system up and running while you replace the failed hot-swap unit.
1. Unplug the AC power cord from the failed power supply module.
2. Remove the chassis left-top cover as described in Section 3.2.
3. Remove the screws that secure the power module to the chassis, then pull it completely
out.
4. Replace the failed unit with another unit of the exact same part number (PWS-1K28P-
SQ).
5.
Gently but firmly push the new unit all the way into the open bay.
6. Secure it to the chassis using the screws you previously removed.
7. Finish by replacing the chassis left/top cover and then plugging the AC power cord back
into the new module you just added.
