User's Manual Part 2

3EM21522AAAA Maintenance
Issue 1, March 2008 DTR-0200-SA-SIRIUS
6-7
Chart 1 Remove and Replace signal Processing Unit (SPU)
Main power to repeater must be off.
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 - 2 for SPU rear cable connector panels (VSAT rcvr,
modulator, controller, and up–converter) and disconnect all cables. Be
sure to mark cables for ease in reconnecting
.
7 Remove SPU via front of cabinet.