Allied Telesis AT-SBx31CFC960 - Manual (Page 197)

SwitchBlade x3112 Chassis Switch and AT-SBx31CFC960 Card Installation Guide
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4. Using a #1 Phillips-head screwdriver, remove the two screws that
secure the plastic cover over the positive and negative terminals and
remove the plastic cover from the power supply, as shown in
Figure 138. You may need to lift the locking handle slightly to access
the bottom screw.
Figure 138. Removing the Plastic Cover
Note
The plastic cover is not used with the right angle terminals.
5. Use a #3 Phillips-head screwdriver to remove the two screws from the
positive and negative terminals, as shown in Figure 139 on page 198.