Replacing A Dc Power Rail Module (Prm) - Polycom DOC2709A Hardware Manual

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Replacing a DC Power Rail Module (PRM)

On the rear of the RMX 4000 two DC Power Rail Modules are fitted, each with their own
power cord.
Use the following procedure to replace a DC Power Rail Module:
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Using the handle fitted to the PEM, pull the PEM unit out.
Carefully slide the PEM unit out from the rear slot.
Slide in the replacement PEM unit.
Push the PEM unit firmly into the Power Supply, making sure it is properly seated in its
slot.
Tighten the captive screws on the rear panel of the PEM unit to the rear chassis.
Please verify the type of PRM used on your RMX 4000. Do not insert a Power Rail Module of a
different type on your system.
When replacing a DC Power Rail Module:
On the Mains, disconnect the electricity that supplies direct current running through the power
cable to the failed DC PRM.
Turn OFF the circuit switch on the each of the DC PRMs and from the Mains.
Verify that DC PRM unit you are about to replace on the RMX 4000 is not HOT or has
any Live current feed.
Remove the plastic cap fitted to the Terminal block that protects the direct current
connections.
Using a star screw driver, disconnect the two wires connected to the Terminal block
(-48 VDC & RTN) of the failed DC PRM unit.
Unscrew the captive screws on the rear panel of the PRM unit that secures the unit to
the chassis.
Chapter 2-Component Replacement
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