Polycom DOC2559C - Manual (Page 50)

Chapter 2- Component Replacement
2-6
3 Carefully slide the Power Supply unit out from the front slot.
4 Slide in the replacement Power Supply unit.
5 Push the Power Supply unit firmly into the Backplane, making sure it
is properly seated in its slot, and that the latch is in a locked position.
6 Tighten the captive screws on the front panel of the Power Supply
unit to the chassis.
Replacing an AC Power Entry Module (PEM)
On the rear of the RMX three AC PEM’s are fitted, each with their own
power cord.
Use the following procedure to replace a Power Entry Module (PEM):
1 Unplug the Power cord connected to the failed PEM unit.
2 Unscrew the captive screws on the rear panel of the PEM unit that
secures the unit to the chassis.
3 Using the handle fitted to the PEM, pull the PEM unit out.
Please verify the type of PEM used on your RMX 4000. Do not insert a PEM of
a different type on your system.