Acer Altos MU.R230E.001 - Manual (Page 77)

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To install a hot-swap power supply module:
1 Detach the cover from the chassis.
Keep the cover for future reassembly.
2 Slide the module into the empty bay until you feel resistance, and
it locks into place.
3 Verify that the power status indicators on the main power supply
and on the newly installed redundant power supply are
illuminated green.