Acer Altos R520 M2 Series User Manual page 93

To install a second power supply module:
1 Observer the ESD precautions described on page 35.
2 If a filler panel is installed, remove the filler panel.
(1) Using your thumb and index finger, squeeze the filler panel
latch to release the filler panel from the chassis.
(2) Pull the filler panel out of the power supply module bay.
3 Insert the new power supply module into the empty module bay,
until it locks into place.
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