Allied Telesis AT-SBx31CFC960 - Manual (Page 262)

Chapter 13: Replacing Modules
262
Figure 167. Reinstalling the Nut and Washer on the Grounding Post
11. Lift the locking handle and slide the power supply from the chassis.
Refer to Figure 168 on page 263.
Warning
The power supply is heavy. Use both hands to hold the module as
you remove it from the chassis.