Nortel DMS-100 Series Manual page 123

Procedure 12-1
Replacing the P/A Comm circuit pack (NT6M84AA or NT6M84BA)
Step Description
31
Remove the power from the circuit pack first by disconnecting (P11) located in the upper
right quadrant. Remove the other cables.
Note: Verify the cable markings (identification) or attach labels to the cables when removing them
to facilitate replacement in the correct positions.
Alarms may also activate and the DPP status panel lights will all be off. This is normal.
Silence the alarm at the switching system and go to step 5.
32
Remove the screws that fasten the P/A Comm circuit pack. Gently remove the circuit pack
from its mounting position.
33
Make sure any circuit pack option settings are set the same as the settings listed in Table
12-1, 12-2 or 12-3 prior to installation.
Note: Improper performance can be caused by incorrect settings, and produce fault-like symptoms
in the DPP.
34
Mount the replacement assembly in the vacated position.
Note: When replacing the screws, align carefully before tightening to avoid stripping. Tighten the
screws, alternating until all are equally tight. Do not "cinch down" any one screw until all are
properly aligned; no binding or force needed to turn.
35
Reattach any cables removed in step 4 in reverse order.
Note: Verify the cable markings (identification) or attach labels to the cables for correct positioning.
WARNING
Incorrect positioning of cables will cause alarms and communication problems.
36
Properly reroute all cables. Make sure all wires and cables are routed so they are not
pinched.
Power and Alarm Communications circuit pack (NT6M84xx) 12-3
Sheet 2 of 3
DPP Hardware Component Replacement Guide DPP001 and up