Allied Telesis Removable Power Supply and Fan - Manual (Page 8)

Installation Guide
7
Installing a PWR01, PWR02, or FAN01
1. If there is a PSU, fan or blanking plate in the bay you wish to install the unit,
first remove the old unit, following the steps described in section
“Removing a Power Supply Unit or Fan” on page 21 .
2. Insert the new PSU or fan unit, and carefully slide it into the bay.
Insert it slowly, being sure to keep it straight. Firmly press the unit until the
faceplate engages, or nearly engages, the chassis. Forcing a misaligned unit
into the bay is likely to damage both the unit and chassis.
Note that when you have only one PSU installed in the AT-9924T and
AT-9924SP switches, it must be installed in bay 2 to optimise cooling.
3. Secure the unit in the switch by tightening the captive screws on the
faceplate.
Captive screw
Captive screw
PSU
Switch