Harris Maxiva ULX COFDM Series Technical Manual

Contents

Harris Maxiva ULX COFDM Series Technical Manual Manual pdf 194 page image

5-6 888-2629-200 10/6/10WARNING: Disconnect primary power prior to servicing.Section 5 Maintenance and Alignments Maxiva ULX COFDM Series5.2.4 Operation With Inoperative PA ModulesThe PA module reject loads, located inside the module combiner, are sized with enoughmargin to allow operation under any imbalance condition that may be encountered. Aslong as one module is installed and operational the transmitter will continue to produceRF power but at reduced levels (depending on how many modules are removed).5.2.5 PA Module/Rack AlignmentIf difficulty installing modules is encountered and misalignment of the rack isencountered an alignment of the rack may be needed. The following steps outline thealignment procedure:STEP 1 Disconnect power from transmitter. Turn off breakers AC1 and AC2on the cabinet being aligned.STEP 2 Drain system of coolant.STEP 3 Remove all PA and IPA modules from the rack half being aligned.STEP 4 Loosen manifold clamps (bolts) for the section of the rack beingaligned. The clamps are shown in Figure 5-3.NOTE:If both halves of the rack need alignment start with alignment of the bottom halffirst. Align the top half second.