6-172 Section 060-INDP-610 Maintenance Procedures Guide
297-6201-502 Standard 01.02 September 2000
Power and Alarm Communications PCA replacement (NT6M84BA)
To replace the P/A Comm PCA, use the following procedure. Refer to Table
6-20 and Figure 6-20 for a description of the switch and jumper options for
this PCA.
Procedure 6-41
Power and Alarm Communications PCA replacement (NT6M84BA)
Step Description
CAUTION
Since all BMC PCAs are static sensitive, be careful when handling them.
Wear a wrist grounding strap when working with the BMC.
WARNING
Since the BMC is powered up during this procedure, observe all safety
procedures for operations on live equipment.
54
Make sure no polling is occurring. Wait for a low traffic period, if possible.
55
Remove the slotted screws that fasten the outer edges of the rear panel assembly to the
cabinet.
56
Remove the front panel of the A chassis. Put the two panels in a safe place to prevent
bending and scratching.
57
Remove the power from the PCA 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 BMC status panel lights will all be off. This is normal.
Silence the alarm at the switching system and go to step 5.
58
Remove the screws that fasten the P/A Comm PCA. Gently remove the PCA from its
mounting position.
(Sheet 1 of 3)
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