AT&T 3.0 manual Insert a new power supply

Power Supply Problems

To replace the power supply module, follow the steps below and refer to Figure 4-3.

1 Insert a new power supply.

aReinstall the power supply module by hooking the top into the basic carrier and then swinging it down into place. Push the lower end firmly until the locking tab clicks.

bReplace the ferrite cores around the AC power cord and ground wire and slide the ferrite cores between the wire manager and the power supply module.

cAttach the ground wire to the grounding screw.

2For each power supply and auxiliary power unit, connect the AC power cord to the connector marked AC INPUT on the power supply.

3Plug the other end of each AC power cord into the AC outlet.

4Power up the system by turning on the components listed below in the order given.

aPower supply on each expansion carrier

bPower supply on the basic carrier

The system automatically cold starts.

CAUTION:

Do not plug the power supply or the auxiliary power unit into the AC outlet until you are ready to turn on the system, as described in “Powering Up the System” in Chapter 2 of Installation.

Do not attach the power cord(s) to any building surfaces.

Control Unit Problems 4-11