Allied Telesis AT-SBx81CFC960 - Manual (Page 188)

Chapter 9: Powering On the Chassis
188 Section II: Installing the Chassis
Figure 131. 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 132 on page
189. You may need to slightly lift the locking handle to access the
bottom screw.
On/Off Switch