User's Manual Part 2

3EM21522AAAA Maintenance
Issue 1, March 2008 DTR-0200-SA-SIRIUS
6-11
Chart 2 Remove and Replace High Power Amplifier (HPA)
Main power to repeater must be off.
This procedure requires a 1 1/4” open end wrench with an overall length of
no more than 4 inches to disconnect and reconnect the RF OUT cable.
STEP PROCEDURE
REMOVAL
1 Open front and rear doors.
a To open front door
Release two locking screws then release two door latches.
b To open rear door
Release one locking screw then release two door latches.
2 Coordinate with NMC and switch repeater to local operating condition.
3 Switch all repeater PDU circuit breakers to OFF, switching main
breaker last.
4 Switch OFF commercial power source breaker supplying power to
repeater.
5 Hang “DANGER – DO NOT TURN ON – PERSONNEL WORKING” sign at
commercial power source breaker.
6 See Figure 6 - 3 for HPA rear panel cable connectors and disconnect HPA
cables (AC IN, RF OOUT, CONTROL I/F, RF IN). Be sure to mark
cables for proper reconnecting
.
7 Remove HPA via front of cabinet.