10 000 WATT FM BROADCAST TRANSMITTER
FM10
Page 5-17
01 October 2002
Table 5-5 Fault Analysis - No RF Output or Reduced RF Output
ALARM LAMP STATUS PROBABLE CAUSE
RF ON
and INTERLOCK OPEN off RF off selected. To restore normal operation, select RF ON.
RF ON
off and INTERLOCK OPEN on To restore normal operation, close the external interlock switches.
PA FAIL on A fault condition exists in one or more of the RF power modules. See
paragraph 5.11.1 for trouble shooting procedure.
COMBINER MATCHING on A fault condition has occurred in the combiner assembly that has
resulted in an unacceptable impedance match at the combiner input.
As the combiner contains no user serviceable parts, consult the factory
for replacement/repair options.
COMBINER MATCHING and PA FAIL
on
A fault condition exists in at least thirteen of the RF power amplifiers
causing an unacceptable match at the combiner. The detected forward
power level was too low for the PA supply voltage level being applied
to the RF power modules. See paragraph 5.11.1 for trouble shooting
information.
COMBINER MATCHING on and any
three PA VDC FAIL PWR SPLY A
THRU F
A fault condition has occurred which caused at least three of the RF
power modules PWR MDL circuit breakers to trip off. See paragraph
5.11.12 for trouble shooting information.
MODULE RF DRIVE on and any
one PA VDC FAIL PWR SPLY A thru F
The RF drive level at the input to an RF power module has dropped to
an unacceptable level and the associated power supply has been
inhibited. See paragraph 5.11.2 for trouble shooting information.
MODULE RF DRIVE on, COMBINER
MATCHING
on and three or more of
PA VDC FAIL PWR SPLY A thru F
The RF drive level at the input to at least three RF power modules has
dropped to an unacceptable level and the associated power supplies
have been inhibited. See para 5.11.2 for trouble shooting information.
MODULE TEMP on and any one of PA
VDC FAIL PWR SPLY A thru F
Temperature inside one of the RF power modules has exceeded its pre-
set threshold and its associated power supply has been inhibited. See
paragraph 5.11.3 for trouble shooting information.
MODULE TEMP on, COMBINER
MATCHING
on and three or more of
PA VDC FAIL PWR SPLY A thru F
Temperature inside at least three of the RF power modules have
exceeded their pre-set threshold and the associated power supplies
have been inhibited. See paragraph 5.11.3 for trouble shooting
information.
AC POWER PHASE on One or more of the AC power phases has failed. See paragraph 5.11.4
for trouble shooting information.
HIGH AC POWER on The AC power voltage has exceeded its pre-set threshold. See
paragraph 5.11.5 for trouble shooting information.
LOW AC POWER on The AC power voltage has dropped to an unacceptable level. See
paragraph 5.11.6 for trouble shooting information.
To Next Page
Loading...
