Harris Constellation, Installation And Maintenance Manual

Page: 162 / 264

Constellation™ 2002 June 20
12-12
Removing the Transmitter Assembly
•
In a MHSB configuration, start with step 1 .
•
In a nonprotected configuration, start with step 3 .
In a nonprotected configuration, removing the
Transmitter Assembly is a service-affecting
procedure.
1. Use the Keypad command to lock traffic onto the standby Transmitter
and Receiver Assemblies. This step causes a minor alarm.
CONTROL > LOCK/IF LPBK > LOCK MOD/TX, SET
CONTROL > LOCK/IF LPBK > LOCK DMOD/RX, SET
Since switching of Transmitter Assembly is not
errorless, this procedure momentarily affects
customer traffic.
2. Verify that the standby Transmitter and Receiver Assemblies are locked
and passing traffic.
3. On the Transmitter Assembly you are removing, press the TX switch to the
OFF position to turn off the power amplifier.
4. On the corresponding Power Supply, press the PWR switch to the OFF
position to turn off the power supply.
5. Disconnect the two cables on the Transmitter Assembly.
•
The cable connected to the IF IN SMA connector
•
The cable connected to the ACU
6. Unfasten the 2 captive thumbscrews.
7. Carefully pull out the Transmitter Assembly from the shelf.
Installing the Transmitter Assembly
Before plugging the spare Transmitter Assembly
into the Constellation card cage, the correct