Harris Corporation Constellation™
Field-Replaceable Units 12-25
FIELD-
REPLACEABLE
UNITS
In a nonprotected configuration, removing the
Modem is a service-affecting procedure.
1. Use the Keypad command to lock traffic on to the Modem that is not
being removed. This procedure causes a minor alarm.
CONTROL > LOCK/IF LPBK > LOCK MOD/TX, SET
CONTROL > LOCK/IF LPBK > LOCK DMOD/RX, SET
2. On a repeater system:
On the off-line Power Supply faceplate, turn the PWR switch OFF.
3. Disconnect the cable to the IF OUT SMA connector.
4. Disconnect the cable connected to IF IN SMA connector.
5. Use the 2 extractor tabs to unlock the Modem from the shelf.
6. Carefully pull out the Modem from the shelf.
Installing the Modem
1. Check the part number of the Modem to ensure that the correct unit is
being installed.
2. Ensure that the 2 extractors are in the unlocked position.
3. Carefully slide the Modem into the designated slot in the shelf until the
unit plugs into the backplane.
4. Use the 2 extractor tabs to lock the unit into place.
5. Reconnect the cables at
• IF OUT
• IF IN
6. Use a torque wrench to tighten the connectors (8 to 9 in-lb).
7. On a repeater system:
On the Power Supply faceplate, turn the PWR switch ON.
Repeater System
In a repeater system where the Modem units are not the same (that is, one is a
Modem and the other is a Cable Modem), ensure that the system
synchronization is set to SOURCE timed.
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