GV10/GV7.5 TROUBLESHOOTING MANUAL
RESPONDING TO ALARMS
VERSION 3.2 2016-03-10
PAGE 4.1.25
Exciter A/B: +5V A or
B Fail, +3.3V Fail,
+1.8V Fail, +1.2V Fail
Power Supply (red)
This alarm occurs if the associated power supply in the exciter is 10%
higher or 10% lower than the desired value.
Module #: Fan 1-6 Fail Power Amplifier
(amber)
This alarm occurs if the module fans have been enabled, but the fan
tachometer measurement is below 2200 RPM. Inspect the affected fan and,
if necessary, replace it (see
“Module Cooling Fan Replacement” on
).
Module #: Fan Fail
Shutdown
Power Amplifier (red) This alarm occurs when more than one of the module’s six fans have failed.
The module will shut down. Failed fans must be repaired or replaced before
the module can operate. Check for associated Fan 1-6 Fail alarms and
troubleshoot accordingly.
Module #: Fan Volts
Fail (Fan V Fail)
Power Supply (red)
This alarm occurs if the associated module’s cooling fan supply voltage is
10% high or 10% low. This may be the result of a circuit fault on the
module control/interface PWB.
Module #: High Reject
Power (High Rej)
Power Amplifier (red) This alarm occurs if the associated module’s reject load power exceeds
400 W. This may be the result of PA failures. Check for associated alarms
and troubleshoot accordingly. This alarm may be accompanied by a Reject
Foldback alarm, which means the transmitter power will be reduced to
protect the reject load.
Module #: High RF
Drive Power (RF Drv
High)
Power Amplifier (red) This alarm is indication only and occurs if the input RF drive (exciter power)
is greater than 45 W. Check the exciter power setpoint to make sure it is
correct for the transmitter.
Module #: High
Temperature (High
Temp)
Power Amplifier (red) This alarm occurs if the associated module’s heatsink temperature exceeds
85°C (185°F). This alarm is most likely caused by excessive ambient
temperature, a module fan failure or blockage, or excessive power amplifier
dissipation. This alarm will clear when the module’s heatsink temperature
decreases to 75°C (167°F).
Module #: Low RF
Drive Power (RF Drv
Low)
-
This alarm occurs if the input RF drive (exciter power) is less than
10 W
and
the transmitter has not intentionally reduced it to that level. This may be the
result of an exciter fault, excessive load variation on the active exciter
output, or defective components on the RF drive splitter/changeover
assembly.
Module #: Missing
Power Amplifier (red) This alarm occurs if the RF power module is removed. If the associated RF
power module is present, and the alarm still occurs, try reseating the RF
power module. If the alarm persists, suspect a fault with circuitry on the
module control/interface PWB (A3). See also Rack #: Module Extraction
Shutback alarm.
Device and
Alarm Name
(AUI, UI)
Controller Front
Panel LED (color)
Description and Troubleshooting Action
Summary of Contents for GV10
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