142 Power Amplifier Fault Finding TB8100 Service Manual
© Tait Electronics Limited September 2006
Final 1 or 2 Current High / Current Imbalance
1. Check that the load is not faulty.
2. Go to “60 W Board” on page 162. If you are testing a 100W PA, we
recommend testing the splitter and combiner boards first (refer to
“Splitter and Combiner Boards (100W PA Only)” on page 160).
Supply Voltage High or Low
Measure the supply voltage to the PA. If it is 10.8VDC to 16VDC, go to
“Boost Regulator Board (12V PA Only)” on page 168. If it is not, check
the power supply. Note that the standard test voltage is 12.5VDC.
Measure the supply voltage to the PA. If it is 28VDC ±2V, go to “Control
Board” on page 148. If it is not, check the PMU or power supply.
Driver Temperature High
1. Check that the alarm threshold is not too low (Configure > Alarms
> Thresholds). If the threshold is below the default value of 80°C,
increase the value and check whether the alarm is still present. If it
is, go to Step 2. If it is not, go to “Visual Inspection” on page 144.
2. Check the temperature of the PA with the Service Kit (Monitor >
Monitoring > Power Amplifier). If the temperature is too high, go
to “6W Board” on page 155. If it is not, go to Step 3.
3. If the alarm threshold and PA temperature are correct, and the alarm
is still present, go to “6W Board” on page 155.
Final 1 or 2 Temperature High
1. Check that the alarm threshold is not too low (Configure > Alarms
> Thresholds). If the threshold is below the default value of 90°C,
increase the value and check whether the alarm is still present. If it
is, go to Step 2. If it is not, go to “Visual Inspection” on page 144.
2. Check the temperature of the PA with the Service Kit (Monitor >
Monitoring > Power Amplifier). If the temperature is too high, go
to “60W Board” on page 162. If it is not, go to Step 3.
3. If the alarm threshold and PA temperature are correct and the alarm
is still present, go to “60W Board” on page 162.
28V
12V
28V
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