10 000 WATT FM BROADCAST TRANSMITTER
FM10
Page 5-27
01 October 2002
NOTE
If it is necessary to check the control/monitor PWB's
IPA module temperature circuitry, refer to the
control/monitor PWB's service instruction manual
and the trouble shooting data in section 7 of this
manual to isolate circuit defects.
5.11.12
IPA VDC FAIL PWR SPLY (A thru F)
ALARM:
A
PA VDC FAIL PWR SPLY
alarm can
occur if 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 switching power
supply heatsink indicated is/was in excess of 98
°
C.
Trouble shoot a
PA VDC FAIL PWR SPLY
alarm as
follows:
(a)
If the circuit breaker for the associated
switching power supply has not tripped off, it is
probable that the alarm was triggered due to a
low output from the supply in question. Refer
to paragraph 5.11.12.1 to trouble shoot this
failure condition.
(b)
If the circuit breaker for the associated
switching power supply has tripped off, it is
probable that the alarm was triggered due to an
excessive output from the supply in question or
the allowable operating temperature was
exceeded. Refer to paragraph 5.11.12.2 to
trouble shoot these failure conditions.
5.11.12.1 Low Supply Output:
Trouble shoot a
switching power supply module for a low output by
checking the following:
(a)
Using a digital voltmeter, measure the output
voltage of the suspect supply at the test point
(TP1) provided on the supply.
(b)
The reading obtained in step (a) can be
compared to that of the other switching power
supply modules to see if it is unacceptably low.
Compare the reading obtained in step (a) with
the voltage recorded as
PA VDC [FWD PWR
set to Assigned Level]
in table 5-6. If these
readings do not coincide, refer to the switching
power supply module's service instruction
manual for replacement or repair instructions.
(c)
If the switching power supply module's output
voltage is normal, a possible fault exists in the
power supply control PWB's low PA volts
detection circuitry.
NOTE
If it is necessary to check the power supply control
PWB's low PA volts detection circuitry, refer to the
power supply control PWB's service instruction
manual and the trouble shooting data in section 7 of
this manual to isolate circuit defects.
5.11.12.2
High Supply Output/High Supply
Temp:
Trouble shoot a switching power supply
module for a high output or high temperature by
checking the following:
(a)
Attempt to reset the associated switching power
supply's circuit breaker.
(b)
If the circuit breaker cannot be reset, proceed to
step (f). If the circuit breaker can be reset and
all alarms reset, it is probable that the alarm
was triggered due to an excessive temperature
in the switching power supply module.
(c)
Check for air flow out of the top of the supply
in question.
(d)
Allow the system to run to see if the alarm
reoccurs. If the alarm reoccurs and all other
switching power supply modules continue to
operate, refer to the switching power supply
module's service instruction manual for
replacement or repair instructions.
(e)
If, after replacing/repairing the faulty switching
power supply module, the alarm continues to
occur, a possible fault exists in the power
supply control PWB's high PA volts detection
circuitry.
NOTE
If it is necessary to check the power supply control
PWB's high PA volts detection circuitry, refer to the
power supply control PWB's service instruction
manual and the trouble shooting data in section 7 of
this manual to isolate circuit defects.
Summary of Contents for FM10
Page 173: ...Figure SD 1 Electrical Schematic FM10 FM Broadcast Transmitter Overview Page SD 1 15 July 1997...
Page 174: ...Figure SD 2 Electrical Schematic AC DC Power Supply Sheet 1 of 2 Page SD 2 15 July 1997...
Page 175: ...Figure SD 3 Electrical Schematic AC DC Power Supply Sheet 2 of 2 Page SD 3 15 July 1997...
Page 177: ...Figure SD 5 Electrical Schematic 3 Phase Monitor PWB NAPC60 03 Page SD 5 15 July 1997...
Page 178: ...Figure SD 6 Electrical Schematic RF Power Stage Sheet 1 of 2 Page SD 6 15 July 1997...
Page 179: ...Figure SD 7 Electrical Schematic RF Power Stage Sheet 2 of 2 Page SD 7 15 July 1997...
Page 180: ...Figure SD 8 Electrical Schematic RF Combiner Final Filter NAF79 Page SD 8 15 July 1997...
Page 181: ...Figure SD 9 Electrical Schematic Control Monitor Function Page SD 9 15 July 1997...
Page 182: ...Figure SD 10 Electrical Schematic Control Display PWB NAPD05 01A Page SD 10 15 July 1997...
Page 185: ...Figure MD 1 Assembly Detail FM10 FM Broadcast Transmitter Front View Page MD 1 15 July 1997...
Page 186: ...Figure MD 2 Assembly Detail FM10 FM Broadcast Transmitter Rear View Page MD 2 15 July 1997...
Page 189: ...Figure MD 5 Assembly Detail NAG02 01 NAG02 02 Circuit Breaker Panel Page MD 5 15 July 1997...
Page 190: ...Figure MD 6 Assembly Detail NAC76 Power Supply Control Panel Page MD 6 15 July 1997...
Page 192: ...Figure MD 8 Assembly Detail NAPD05 01A Control Display PWB Page MD 8 15 July 1997...
Page 193: ...Figure MD 9 Assembly Detail NAI07 Intermediate RF Drive Splitter Page MD 9 15 July 1997...
Page 194: ...Figure MD 10 Assembly Detail NAFP68 IPA Input Power Probe Page MD 10 15 July 1997...
Page 196: ...Figure MD 12A Assembly Detail NAS43 02 Low Voltage Power Supply Page MD 12A 15 July 1997...
Page 197: ...Figure MD 12B Assembly Detail NAS43 02A Low Voltage Power Supply Page MD 12B 15 July 1997...
Page 199: ...Figure MD 14 Assembly Detail NAPC60 03 3 Phase Monitor PWB age MD 14 15 July 1997...