Allied Telesis AT-SBx31CFC960 - Manual (Page 268)

Chapter 13: Replacing Modules
268
Figure 168. 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 169 on page 269.
Warning
The power supply is heavy. Use both hands to hold the module as
you remove it from the chassis.