Allied Telesis AT-SBx81CFC960 - Manual (Page 186)

Chapter 9: Powering On the Chassis
186 Section II: Installing the Chassis
Figure 127. On/Off Switch on the AT-SBxPWRSYS1 DC Power Supply
4. Use a #1 Phillips-head screwdriver to loosen the two screws on the
plastic cover over the positive and negative terminals on the power
supply and slide the cover to the right, as shown in Figure 128 on page
187. You may need to lift the locking handle slightly to access the
bottom screw.
On/Off Switch