Tait TB8100 Service Manual page 141

TB8100 Service Manual
© Tait Electronics Limited September 2006
Power Foldback
The PA has detected a fault condition and has reduced its power output to
a minimal level to prevent damage. Check the other alarms to see what fault
condition or conditions have caused this.
Forward Power Low
The output power is below the configured threshold. Check that the alarm
threshold is not too high (Configure > Alarms > Thresholds). If the
threshold is above the recommended value given in
value and check whether the alarm is still present. If it is, go to
it is not, go to "Visual Inspection" on page
Reverse Power High
The reverse power output is above the configured threshold. Check that the
alarm threshold is not too low (Configure > Alarms > Thresholds). If the
threshold is below the recommended value given in
value and check whether the alarm is still present. If it is not present, go to
"Visual Inspection" on page
check the load is not faulty
check the low pass filter (refer to
Coupler Board" on page
Calibration Invalid
Recalibrate the PA as described in the Calibration Kit documentation and
return to Task 1.
Hardware Configuration Invalid
Select Monitor > Module Details > Power Amplifier and check that the
module details programmed into the PA are correct and match the actual
hardware configuration. If they are correct, it is possible there is a break in
the connectivity between boards. Go to
If they are not correct, reprogram the correct details into the PA using the
Calibration Kit (this requires a dongle) and then recalibrate the PA.
Driver Current High
Go to "6W Board" on page
144.
144. If it is still present, proceed as follows:
"Low Pass Filter and Directional
165).
"Visual Inspection" on page
155.
Power Amplifier Fault Finding
Task 2, decrease the
Task 4. If
Task 2, increase the
144.
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