Nortel DualMode 800, Maintenance Manual

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12-6 Enclosure maintenance
411-2051-500 Draft 00.01 November 1999
Replacing faulty radio frequency (RF) units
For the replacement of a radio frequency (RF) unit, use the following procedure:
1. At the MTX, put the cell site or the unit out-of-service as required.
2. If replacing the Rack Interface Panel (RIP), switch off the supply to
the RIP at the rectifier. If replacing a TRU or MCPA shelf, switch off
the circuit breaker to that unit at the RIP.
3. Label and disconnect the cables/connectors connected to the unit.
4. Remove the screws mounting the unit to the frame and then remove the
unit from the frame.
5. Replace a new or known working unit on to the frame and fix it with the
mounting screws.
6. Reconnect the cables/connectors to their appropriate locations. Ensure
that they are connected properly.
7. Switch on the circuit breaker to the unit at the RIP or switch on the power
supply to the RF Frame at the power plant.
8. At the MTX, ensure that the datafill information on the replacement unit
is correct.
9. At the MTX, put the cell site back into service.
10. Verify that the replacement unit is functioning correctly.
11. Return the faulty unit to your Nortel Networks Customer Service
Operations office for repair.
CAUTION
Service interruption
The enclosure may be completely out-of-service when a unit
such as the RIP, a duplexer, or a MCPA is removed. Replace
these units during low traffic period.
CAUTION
Hot insertion replacement may cause damage to the
components and a possible service interruption.