Acer Altos R520 M2 Series User Manual page 94

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To remove a power supply module:
Caution! Power supply hot-plug operations should be performed
only if a failure occurs in the power supply.
1 If there are more than one power supply modules installed,
determine which power supply module has failed.
2 Remove the AC power cord from the power supply being replaced.
3 Remove the power supply module.
(1) Press the power supply latch to release the power supply
module from the chassis.
(2) Use the handle to pull the power supply module out of the
server.
4 Install a new power supply module or install a filler panel to the
empty bay.
3 System upgrade