363-208-011 Appendix 2
NE00676-70 Local Alarm Relay Unit Installation Procedure
Issue 1.0 August 1998 7
❑
Step 12:
The plastic housing of the 404A UIP you are about to remove is held in
place by three integral plastic clips (either end plus top) and a plastic
button on the bottom. The clips and button engage the metal housing
that is part of the ARM shelf.
❑
Step 13:
Disengage all clips, using an insulated spud or similar tool, and pull
UIP forward and down until free of chassis (but with cables still con-
nected).
❑
Step 14:
Carefully pull out the lug end of the previously disconnected ground
lead.
❑
Step 15:
At this point the UIP is still operating and is connected to the system
by three cables plugged into the UIP. The connectors associated with
these cables are designated J254 (left side as viewed from the front,
looking down on the top of the unit), J256 (right side upper connector)
and J214 (right side lower connector).
❑
Step 16:
At this point, if the connectors are removed and reconnected to the
replacing 404B, and the process takes more than 55 seconds, the sys-
tem will perform an internal audit and drop service (existing and new)
for a period of approximately three minutes. To negate this from hap-
pening the following instructions should be rigidly followed.
❑
Step 17:
Locate the 404B UIP and have another installer, also wearing an ESD
strap, hold the 404B directly alongside the 404A, in order that the
three referenced connectors may be quickly disconnected from the
404A and immediately connected to the 404B. The J256 and J214
connectors require the same orientation and thusly only go in one way.
The J254 connector (power) is a 3-pin connector and is not keyed.
The pins are carrying -48VDC, ground and -48VDC respectively so
that it is imperative that the connector be properly aligned prior to
engagement, since being off one pin will connect -48VDC to ground.
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