ADTRAN 25 manual Power Supply Replacement

MAINTENANCE

Power Supply Replacement

To replace the power supply, follow these steps:

Danger: Hazardous voltages are present on some backplane pins. Unplug power cord from the outlet, and wait at least 5 minutes before removing rear cover or power supply.

1.Remove the front cover of the cabinet.

2.Remove the four No. 6-32 screws at the corners of the fan assembly.

3.Unplug the fan assembly from system power by removing the two modular plugs on the left side of the assembly.

4.Set the fan assembly aside in a safe place.

5.Unplug the 3-prong ac power connector that supplies building power to the power supply. This connector is located at the bottom front of the power supply.

6.Reach into the cabinet, between the power supply and the port carrier. At the rear of this narrow space is the multipin dc power connector that connects the power supply to the backplane.

Remove this connector by squeezing the tabs on the top and bottom of the plug and pulling the plug up and away from its receptacle.

7.Remove the four No. 10-24 screws on the left side of the cabinet (viewed from the front). These screws secure the power supply in position.

8.Pull up on the top lip of the power supply and carefully slide it out of the cabinet. The power supply rests on the cabinet floor. There are no additional anchors or guides. The power supply weighs about 4 pounds.

To reinstall a new power supply, follow the preceding steps in reverse order.

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