Lucent Technologies 555-661-140 manual Turning Off the Power, Installing a Copper Shield

MERLIN LEGEND Communications System Release 6.1	Issue 1
Installation 555-661-140	August 1998
Installing the Control Unit	Page 2-21
Installing the Power Supply

NOTE:

It is not necessary to install ring generators in a new system with new 012 (apparatus code 517G13 or later) or new 008 (apparatus code 517D28 or later letter) modules. If you are upgrading or using older modules, see Maintenance and Troubleshooting.

Turning Off the Power

! Turn off each power supply.

! Disconnect all power cords and auxiliary units.

Installing a Copper Shield

The added power supply in each expansion carrier can cause excessive noise in the module occupying the next slot. To eliminate this noise, a copper-foil shield is installed over the power supply. These shields and their labels are packaged in the power unit shielding kit included with the expansion carrier.

NOTE:

The 391C1, 391A3 and 391B2 power supply modules do not require copper shielding. Perform this procedure for older power supply modules (391A1, 391A2, and 391B1) only.

To install a copper shield, follow the steps below. Refer to Figure 2–6 throughout the procedure.

! Make sure all power is off.

! Place the power supply on a flat surface with the right side up (as viewed from the front edge).

! Wipe the module free of any dust or dirt.

! Peel the backing paper from the smaller copper-foil shield to expose the adhesive.