Allied Telesis AT-SBx81CFC960 - Manual (Page 231)

SwitchBlade x8112 Chassis Switch and AT-SBx81CFC960 Card Installation Guide
Section II: Installing the Chassis 231
2. Lift the locking hand on the power supply. Refer to Figure 150.
Figure 150. Lifting the Locking Handle on the Power Supply
3. Carefully pull on the locking handle to slide the power supply from the
chassis. Refer to Figure 151 on page 232.
Warning
The power supply is heavy. Use both hands to hold the module as
you remove it from the chassis.