Constellation™ November 2003
11-22 Field-Replaceable Units
Power Supply Failure
The Power Supply provides power to one Transmitter Assembly and one
Receiver Assembly. When the Power Supply fails, the Transmitter and the
Receiver Assemblies associated with the Power Supply cannot carry traffic. In
a MHSB system, the system automatically switches traffic to the standby units.
Removing the Power Supply
• In a MHSB configuration, start with
step 1
.
• In a nonprotected configuration, start with
step 2
.
1. Use the Keypad commands to lock traffic onto the standby Transmitter
and Receiver. This step causes a minor alarm.
CONTROL > LOCK/IF LPBK > LOCK MOD/TX, SET
CONTROL > LOCK/IF LPBK > LOCK DMOD/RX, SET
2. On the Transmitter Assembly, press the TX switch to the OFF position to
turn off the power amplifier.
3. Press the PWR switch to the OFF position to turn off the power supply.
4. Unfasten the captive thumbscrew.
5. Carefully pull out the Power Supply from the shelf.
Installing the Power Supply
1. Check the part number of the Power Supply to ensure that the correct unit
(or a newer unit) is being installed.
2. Ensure that the PWR switch on the Power Supply faceplate is in the OFF
position.
3. Carefully slide the Power Supply into the designated slot in the shelf until
the unit plugs into the backplane.
4. Use the thumbscrew to fasten the unit to the shelf.
5. Press the PWR switch to ON.
6. On the Transmitter Assembly, press the TX switch to the ON position to
turn on the power amplifier.
MHSB System
1. Use the Keypad command to take the standby units out of lock status.
CONTROL > LOCK/IF LPBK > LOCK MOD/TX, CLR
CONTROL > LOCK/IF LPBK > LOCK DMOD/RX, CLR
2. The standby RF units are now the primary RF units.
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