Tait TB8100, Service Manual

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160 Power Amplifier Fault Finding TB8100 Service Manual
© Tait Electronics Limited September 2006
8.10 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 and
combiner boards.
Task 1 —
Check the Splitter
Board
1. 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 . If
there is not, go to Step 2 .
2. Check for faulty solder joints between the splitter and the PCB. If
the solder joints are not faulty, replace the splitter board. If there is a
faulty joint, repair as necessary and repeat
Step 1 . If there is still no
continuity, 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 to
Step 4 .
Figure 8.12 Location of test points on the splitter and combiner boards
Splitter Combiner
Some models of PA have an SMD termination
resistor on the splitter board.
termination
input
port 1
port 2
termination
output