Removing And Installing Circuit Packs; Figure 77. J 58889An-1 Front Cover Description; Figure 78. J58889An-2 Front Cover Description - AT&T System 85 Installation And Test

Removing and Installing Circuit Packs
Before the circuit packs can be removed or installed, the Remote Group Housing front cover
must be removed. There are three different methods of removing the front cover of the
J58888AN-1 RGH. One method uses one quarter-turn captive screw accessed from the front
cover. This is shown in sketch A of Figure 77. The second method uses two threaded screws
accessed from both sides of the RGH. This is shown in sketch B of Figure 77. The third
method uses two quarter-turn captive screws accessed from the front of the RGH. This is
shown in sketch C of Figure 77. After the screws are loosened or removed, snap the front
cover off to access the circuit packs.
FRONT
COVER
SCREW SCREWS
SCREWS
Figure 77. J 58889AN-1 Front Cover Description
The front cover of the J58888AN-2 RGH is removed by loosening, but not removing, the
screws shown in Figure 78. The front cover can then be removed by sliding it off.
SCREWS
Figure 78. J58889AN-2 Front Cover Description
To install or verify the option settings on the CAL1B board, remove the housing cover (one
piece, front and side). After the front cover has been removed, turn the RGH so that the
bottom is accessible. Six screws hold the the housing cover in place. Remove the front and
middle pairs of screws. The two rear screws should be loosened only. The cover can then be
slid off toward the front.
WARNING: Electrostatic discharge can damage circuit packs containing
integrated circuits (ICs).
Installation personnel must always attach properly grounded wrist -grounding straps before
handling circuit packs. The J 58889AN-1 circuit pack and locations are shown in Figure 79.
The J58889AN-2 circuit packs and locations are shown in Figure 80. After the proper circuit
slot has been determined, remove the circuit pack by unfastening the latch and pulling the
circuit pack straight out. To install the circuit pack, insert the circuit pack in the desired
slot and fasten the latch.
WARNING: Circuit packs in slots 00 through 05 mount component side up;
circuit packs in slots 06 through 08 mount component side down.
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