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MERLIN LEGEND Communications System Release 6.1
Installation
555-661-140
Issue 1
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.