Acer Network Device Altos R520 - Manual (Page 65)

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5 Install the plastic guide on the rear of the optical device, then
secure it with the two screws that came with the optical drive kit.
6 Slide the optical drive tray into the front opening in the server.
Make sure the back end of the plastic guide plugs into the
matching connector on the backplane board.
7 Verify that the blue release lever on the tray locks into place.
8 Observe the post-installation instructions described on page 40.
TP02233