Harris Corporation Constellation™
Field-Replaceable Units 12-27
FIELD-
REPLACEABLE
UNITS
In a nonprotected configuration, removing the
HLM is a service-affecting procedure.
1. Use the Keypad command to lock traffic on to the HLM that is not being
removed. This step causes a minor alarm.
CONTROL > LOCK/IF LPBK > LOCK HLM, SET
2. Use the 2 extractor tabs to unlock the HLM from the shelf.
3. Carefully pull out the HLM from the shelf.
Installing the HLM
1. Check the part number of the HLM to ensure that the correct unit is being
installed.
2. Ensure that the 2 extractors are in the unlocked position.
3. Carefully slide the HLM 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.
Repeater System
• In a repeater system where the Modem units are not the same (that is,
one is 115072 and the other is 115430), ensure that the system
synchronization is set to SOURCE timed.
• In a loop system, when the HLM is at a master site, the HLM must be
set to SOURCE timed.
From the Keypad menu, select
CONFIGURATION > SYSTEM > SYNCHRONIZATION MX >
SOURCE
MHSB System
Use the Keypad command to take the switched unit out of lock status.
CONTROL > LOCK/IF LPBK > LOCK HLM, CLR
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