Specifications

6.4.20 RF Amp Power Supply Voltage Fault
If the transmitter has shut itself off and the above LED is
illuminated RED on the Control front panel, the supply voltage
is either over 270VDC or under 115VDC.
a. Turn on the transmitter and observe the PA+VDC front
panel meter position.
b. If the transmitter will remain on the air long enough to
measure the Supply voltage on the front panel multimeter,
compare this reading to that recorded on the factory test
data sheet.
c. If the reading is significantly lower, a short may exist in
the high voltage supply. This is because a voltage fault
will be detected before a current trip by the Controller.
Note
If the PA +VDC is high or low, check the A/C mains for a vari-
ation from the normal readings. If the A/C main voltages are
significantly different from when the transmitter was installed,
and appear to be stable at the new voltage level, it may be nec-
essary to retap the transformers.
WARNING
ENSURE THAT THE TRANSMITTER IS TURNED OFF AND ALL
PRIMARY POWER IS TURNED OFF AT THE WALL DISCONNECT
SWITCH BEFORE OPENING ANY DOOR OR PANEL. BEFORE
REMOVING PANELS OR OPENING DOORS, VERIFY THAT THE
RF AMP POWER SUPPLY IS DISCHARGED BY CHECKING
“PA+VDC” ON THE FRONT PANEL MULTIMETER. USE A VOLT-
METER TO VERIFY THE POWER SUPPLIES HAVE BEEN DIS-
CHARGED PRIOR TO TOUCHING ANY COMPONENTS.
1. The 230VDC bus bar grounding switches should be
checked for an open when the door is closed.
2. The High Voltage Crowbar circuit should be checked
for shorts.
3. The fuses on the High voltage transformer should also
be checked for any opens.
d. If the voltage is within the Test Data limits then the sensing
circuitry may have failed. Refer to the Controller section
for Troubleshooting the failure.
6.4.21
RF Amp Power Supply Temp Fault
If the transmitter has shut itself off or is running at a reduced
power level and the above LED is illuminated RED on the
Control front panel, possibly along with the ANALOG INPUT
POWER FOLDBACK, then the temperature inside the power
supply is too high. Temperature sensors U1, U2, U3, and U4 are
mounted on the power supply rectifier heatsinks and monitor the
temperature for Supply A and Supply B.
a. Open the right PA cabinet and observe DS1 and DS2 on
the Driver Encoder.
1. If DS2 is illuminated RED, Supply A is overtempera-
ture and if DS1 is illuminated RED Supply B is
overtemperature.
6.4.21.1 Indicator DS1 or DS2 Illuminated
a. Measure the ambient intake air, it should be less than 50
degrees C.
b. Inspect the air filters, if they are clogged with dirt or sand
they will reduce air flow.
c. Verify the blowers are operational and that no blades are
loose. Also check the exhaust air path to make sure there
are no obstructions that could cause excessive back pres-
sure to the cabinet.
d. If intake air and air flow are normal, one of the supplies
could have failed. If the temperature of the rectifier
heatsinks is more than 65°C troubleshoot the +230VDC
power supplies.
e. Excessive current with a high ambient temperature and/or
a slight imbalance in the powersupply can cause excessive
heating of the rectifier heatsinks.
6.4.21.2 No Indicators Illuminated
a. If no indicator is lit and the transmitter has reduced power
to a low level or a failure in the fault sensing circuit has
occurred:
1. Depress the Fault Reset button on the Control front
panel.
2. If the power returns to normal, monitor the transmitter
and Driver Encoder DS1 and DS2 LEDs for a repeti-
tion of the fault.
3. If the transmitter does not return to full power and no
DS1 or DS2 indicators are lit on the Driver Encoder
then the fault sensing circuitry has failed.
b. Check the voltage at the cathode of CR5 on the Transmit-
ter Interface Board.
1. If this is a logic high then refer to the Controller Section
of the manual for troubleshooting.
2. If low refer to the troubleshooting section of the Driver
Encoder to locate this fault.
6.4.22
Remote Control, Local
If the above LED is illuminated RED on the Control front panel,
the transmitter is in the local control mode and all extended/re-
mote control functions are no longer active. Local control is
active even when the Remote control is enabled.
6.4.23
Remote Control, Remote
If the above LED is illuminated GREEN, the transmitter is in
the remote control mode and all extended/remote control func-
tions are active. All local functions are also still active.
6.4.24
Door Interlock
If the transmitter has shut itself off or cannot be turned on and
the above LED is illuminated RED on the Control front panel,
a door interlock or ground stick switch has not been properly
closed.
a. Open the front center door and observe DS1 and DS2 on
the Transmitter Interface.
b. If DS1 is illuminated RED, check to make sure that the
captivehardware is securely fastening all three front doors
of the compartments containing the PA and RF driver
modules to the cabinet. When all front doors are properly
closed, DS1 will extinguish. Observe DS2.
888-2339-002 6-11
WARNING: Disconnect primary power prior to servicing.