160 Power Amplifier Fault Finding TB8100 Service Manual© Tait Electronics Limited September 20068.10 Splitter and Combiner Boards (100W PA Only)These checks will identify any faults present in:■ the continuity of the boards■ the splitter and combiner modules■ the termination resistors.Figure 8.12 shows the location of the test points on the splitter andcombiner boards.Task 1 —Check the SplitterBoard1. Check the DC continuity from the input to port 2, and from the ter-mination resistor to port 1. If there is continuity, go to Step 3. Ifthere is not, go to Step 2.2. Check for faulty solder joints between the splitter and the PCB. Ifthe solder joints are not faulty, replace the splitter board. If there is afaulty joint, repair as necessary and repeat Step 1. If there is still nocontinuity, replace the splitter board.3. Check that there is no DC short to ground on each of the four ports.If there is a short, replace the splitter board. If there is not, go toStep 4.Figure 8.12 Location of test points on the splitter and combiner boardsSplitter CombinerSome models of PA have an SMD terminationresistor on the splitter board.terminationinputport 1port 2terminationoutput
