User's Manual

351804-1 Rev. 100

COM5000-8 TECHNICAL MANUAL

5.4.2 Combiner Module Maintenance

Adjustments: See System Controller operational adjustment in section 5.4.3.3.

5.4.3 System Controller Module Maintenance

For System Controller maintenance, refer to the System Controller Interconnect wiring diagram shown in

Figure 5.4.3.

The System Controller module comprises the following assemblies:

1 ea. Driver/Splitter/ALC PCB 1638-2001-1

1 ea. System Controller PCB 1638-2000-1

1 ea. Power Supply Assy. L162087

1 ea. Fan 21000044

Location of these assemblies is shown in Figure 5.4.3A.

To perform alignment of the System Controller Module it is necessary to operate the Transmitter as follows:

 The System Controller Module is pulled out of the Transmitter rack cabinet to gain access to

subassemblies.

 All Control connections from the T-4180 are in place to permit normal operation of the Transmitter.

 The T-4180 RF Output connector is terminated into a 50 Ohm Load for certain adjustments as

specified below.

 An RF Signal Generator is used to provide the required drive signal to the System Controller Module

for certain adjustments as specified below.

 The Transmitter is terminated in a 50 Ohm Load/Attenuator with a wattmeter inserted between the

RF output connector and the load.