Replace a Power Supply Unit
You can replace a power supply unit (PSU). If your switch includes a second power module bay in which a
PSU is installed, you can replace the PSU while the switch remains powered on and functioning.
The figures in the following procedure show model M4300-24X24F and M4300-24X. However, you replace
a PSU in model M4300-28G, M4300-28G-POE+, M4300-52G, M4300-52G-POE+, M4300-8X8F, or
M4300-48X in the same manner.
To remove one PSU and reinstall another PSU in the same power module bay:
1. If your switch functions with a single PSU only, disconnect the power cord from the PSU and let the
switch power down. If your switch functions with two PSUs, you do no need to power down the switch
and can perform a hot swap.
2. Remove the PSU from the power module bay by moving the release latch to the left and pulling the
extraction handle.
3. Insert the other PSU into the power module bay, and gently push the PSU into the bay until the latch
locks.WARNING: When inserting the PSU, do not use unnecessary force. Doing so can damage the
connectors on the rear of the PSU and on the midplane.
WARNING:When inserting the PSU, do not use unnecessary force. Doing so can damage the connectors
on the rear of the PSU and on the midplane.
Maintenance and Troubleshooting
55
Managed Stackable Switch Series M4300
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