Motorola MTR2000 T5544 Instruction / Field Service Manual page 147

Replacing Backplane Board
68P81096E17-E
09/30/05
Replacement Procedure
1. Turn off station power by turning off breaker at ac source.
2. Remove all option boards from the option card slots as described in
Replacing Wireline Interface Board. Make sure that all boards are
placed on properly grounded anti-static surface.
3. Remove the station control cluster:
1. Remove module lock screws (2) from front of station control clus-
ter.
2. Disconnect BNC connectors on RF cables connecting PA Module
to Exciter Module, and Receiver Module to Receive antenna port.
3. By pulling forward on cluster pull tabs, carefully slide station
control cluster out of station.
4. If station is equipped with an external preselector, label and discon-
nect corresponding RF coax cables to preselector and remove screws
securing preselector to station.
5. If station is equipped with an antenna relay, disconnect control cable
and remove screws securing relay to station.
6. Remove ty-wraps securing battery backup cable and Power Supply-
to-PA cable.
7. Label all cables/wirelines connected to the rear of the Backplane
Board and disconnect all cables/wirelines.
8. Remove screws which secure the metal shield and backplane board
to the top and bottom plates.
9. Remove the metal shield and backplane.
10. Ensure that the correct Backplane Board is being installed.
11. Install the replacement Backplane Board and metal shield using the
screws removed previously, reconnect all cables, and reinstall all
modules, boards and assemblies.
Post-Replacement Optimization Procedure
Using the RSS, run a complete set of diagnostics to exercise all boards and
modules.
Troubleshooting
33