ADCP-75-169 • Issue 1 • June 2004

6.Connect the power wires to the appropriate terminals as specified in the fuse panel user manual.

Note: When connecting the equipment to the supply circuit, be sure to check equipment nameplate ratings to avoid overloading circuits which may cause damage to over-current protection devices and supply wiring.

7.Dress and secure the power wiring at the fuse panel and the HU. The procedure for checking the voltage level and verifying that the HU is ready to power up is provided in the applicable System Operation and Maintenance Manual (see Related Publications section).

4.13Installation Complete

When the installation is complete, refer to the applicable System Operation and Maintenance Manual (see Related Publications section) for the system turn-up and test procedures.

5 MAINTENANCE

This section provides the HU maintenance procedures. Refer to this section when scheduled maintenance is required. The fault isolation and troubleshooting procedures are provided in the applicable System Operation and Maintenance Manual (see Related Publications section).

5.1Host Unit Fan Replacement Procedure

The HU is equipped with two cooling fans which are located on the right side of the HU enclosure. The cooling fans blow cool air into the enclosure. Heated air is exhausted through the vent openings on the left side of the enclosure. Replacement of the fans requires that the HU be turned off for a short period of time. The recommended replacement interval is 60 months. Use the following procedure to remove and replace the HU cooling fans:

1.Before working on the HU or handling a fan, slip on an Electro-Static Discharge (ESD) wrist strap and connect the ground wire to an earth ground source. Wear the ESD wrist strap while completing each section of the fan installation procedure.

Warning: Electronic components can be damaged by static electrical discharge. To prevent ESD damage, always wear an ESD wrist strap when working on the HU, STM, or LPA and when handling electronic components.

2.Notify the NOC or alarm monitoring system operator that the system is going offline.

3.Place the HU On/Off switch in the OFF position (press O).

4.Remove the six flat-head screws (requires TORX screwdriver with T10 bit) that secure the fan/grill assembly to the right side of the HU enclosure as shown in Figure 21. Save screws for reuse.

5.Carefully withdraw the fan/grill assembly from the enclosure until the wiring harness is exposed and the connectors are accessible.

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© 2004, ADC Telecommunications, Inc.