About Replacing a Power Supply Unit
The procedure for replacing a power supply unit differs depending on the various appliance hardware models.
On the models that are equipped with two power supply units for redundant operation, you can replace one of the two while the other is still running.
This applies, for example, to the model F appliances. You can replace only one unit here and keep the appliance running, but you can also replace both units.
For more information, see Replace a Power Supply Unit on a Model F Appliance.