10 000 WATT FM BROADCAST TRANSMITTER
FM10
Page 5-18
01 October 2002
Table 5-5 Fault Analysis - No RF Output or Reduced RF Output
ALARM LAMP STATUS PROBABLE CAUSE
REFLD PWR on The reflected power detected by the transmitters output power probe
has exceeded 100 watts and, if above 440 watts, the transmitter's
output power has been reduced by the protection circuitry to prevent
damage to the RF power amplifiers. See paragraph 5.11.7 for trouble
shooting information.
IPA INPUT
on
The power level at the RF output of the exciter was outside of its
operating window (less than 12 watts or more than 33 watts), as
detected by the IPA input power probe. See paragraph 5.11.8 for
trouble shooting information
.
IPA OUTPUT on The power level at the output of the IPA has dropped below the preset
threshold as detected by the intermediate RF drive splitter assembly.
See paragraph 5.11.9 for trouble shooting information.
IPA SWR on An impedance mismatch exists at the output of the intermediate RF
drive splitter assembly as detected by the forward/reflected power
probe of the intermediate RF drive splitter assembly. See paragraph
5.11.10 for trouble shooting information.
IPA TEMP on Temperature inside the IPA module has exceeded its preset threshold.
See paragraph 5.11.11 for trouble shooting information.
PA VDC FAIL PWR SPLY (one or more
of A thru F on)
The output voltage of the switching power supply indicated is/was in
excess of 55.0 VDC, the output voltage of the switching power supply
indicated is/was too low for the level of control voltage being applied
to the control circuitry of the supply or the temperature of the IPA
switching power supply heatsink is/was in excess of 98
C. See
paragraph 5.11.12 for trouble shooting information.
PWR SPLY FAIL IPA on The output voltage of the IPA switching power supply is/was in excess
of 55.0 VDC or the output voltage of the IPA switching power supply
is/was too low for the level of control voltage being applied to the
control circuitry of the supply. See paragraph 5.11.13 for trouble
shooting information.
FAN FAIL on One or more of the four DC fans located in the fan assemblies of the
power supply or one or more of the two DC fans located on the rear,
lower panel have failed to operate. See paragraph 5.11.14 for trouble
shooting information.
RECTIFIER TEMPERATURE on The temperature of one or both of the rectifier assemblies (A2/A3)
is/was in excess of 90
°
C. See paragraph 5.11.15 for trouble shooting
information.
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