Figure 8.5 Connections On The Fan Contact Board - Tait TB8100 Service Manual

140 Power Amplifier Fault Finding
Fan Failure
1. Fit the front panel to the subrack (if not already fitted). Run the fan
test and check that the fan works (Diagnose > Power Amplifier >
Control Tests). If it does not, go to
panel may be faulty. Fit another control panel and repeat the test.
2. Check that all cables are connected securely and correctly.
3. Check that the fan itself is in working order.
connections on the fan contact board on the front panel.
If it is working, go to
replace the fan and repeat the test.
Figure 8.5 Connections on the fan contact board
PA rotation sense
PMU rotation sense
PMU –
PMU +
Shutdown
The PA has detected a fault condition and has disabled the transmitter to
prevent damage. Check the other alarms to see what fault condition or
conditions have caused this.
VSWR High
The VSWR is above the configured threshold. Check that the alarm
threshold is not too low (Configure > Alarms > Thresholds). If the
threshold is below the default value of 1.5:1, increase the value and check
whether the alarm is still present. If it is not present, go to
Inspection" on page 144. If it is still present, proceed as follows:
check all test equipment connections
check the N-type connector is correctly soldered (refer to
Inspection" on page
check the directional coupler (refer to
Coupler Board" on page
Step
"Control Board" on page
PA
PA –
PA +
PMU
144)
"Low Pass Filter and Directional
165.
© Tait Electronics Limited September 2006
2. If it does, the control
Figure 8.5 identifies the
148. If it is not,
white rotation sense
blue
red
white rotation sense
blue
red
"Visual
"Visual
TB8100 Service Manual