Specifications

6.5.5 Power Supply Fault/RF Mute
If these front panel indicators are illuminated, a power supply
fault has occurred on the Frequency Control or Frequency
Control Interface board. Observe the Power Supply Fault indi-
catorsonbothboards.
6.5.5.1 DS16 On Frequency Control Board Illuminated RED
a. Measure the +8VDC at J7-5.
1. If the supply is not present, troubleshoot the Low
Voltage Supplies.
2. If the supply is present, refer to the Troubleshooting
section for the Frequency Control board.
6.5.5.2 DS3 On Frequency Control Interface Board Illumi-
nated RED
a. Measure the +22VDC, 8VDC, and -22VDC inputs at J11.
1. If any supply(s) is not present, troubleshoot the Low
Voltage Supplies.
2. If all the supplies are present, refer to the Troubleshoot-
ing section for the Frequency Control board.
6.6 Troubleshooting Faults on the Power
Supply Status Panel
The faults on the Power Supply Front Panel are indicated by a
light being extinguished or a breaker tripped.
6.6.1
3 PH A/C Mains Protection Active
If these lights are out and the A/C Mains Input Monitor indicates
A/C present then an MOV has shorted and/or the associated fuse
has failed.
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.
Check the MOV before replacing the fuse.
If only one of the lights is out, there has been a change in the
Main A/C Supply to the transmitter that resulted in one of the
Phases being grounded to provide 120V to ground. If this has
occurred refer to the Installation section, Initial Turn On, to
adapt the circuit to the new power configuration.
6.6.2
RF Amplifier Power Supply 230 Volts Present
If this light is extinguished along with an A/C Mains fault on the
Control front panel, the transmitter main contactor is not en-
gaged or the RF Amp Power Supply Dischargecircuit has failed.
WARNING
ENSURE THAT THE TRANSMITTER IS TURNED OFF AND ALL
PRIMARY POWER IS TURNED OFF ATTHE 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.
To check the RF Amp Power Supply Discharge circuit:
a. Remove the upper Front Power Supply Panel.
b. With an ohmmeter, check for a short on the power supply
by connecting the negative lead to the ground stud above
TB11 and the positive lead to the TB12-8 (see VIEW 6).
The resistance should be 450 Ohms +/-10%.
1. If the resistance is less than 450 Ohms check the
MOSFETs Q1 through Q4.
c. Also, check to verify the Door Shorting Switches open
when the doors are closed.
6.6.3
No Single Phase A/C Protection Active
If both of these indicators are out there is no single Phase A/C
present in the transmitter or the protection circuitry has failed.
WARNING
ENSURE THAT THE TRANSMITTER IS TURNED OFF AND ALL
PRIMARY POWER IS TURNED OFF ATTHE 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.
a. To check the protection circuit,
1. Ohmmeter test F1 and F2 on the rear wall next to the
Main Contactor for an open.
2. If a fuse is open check the MOV before replacing the
fuse.
b. If only one indicator is illuminated the protection for that
side of the A/C line has failed or the A/C power is
configured such that one side of the A/C line is ground.
c. If the incoming A/C measures 120 Volts to ground from
either leg, check the fuse (F1 or F2) associated with that
line for an open.
1. If the fuse is open check the MOV before replacing the
fuse.
6.6.4
Fan Status
If any of these indicators are not illuminated a fan is defective
or a fan fuse has opened. Observe the fans by looking under the
filter to locate the inoperative fan in the door indicated by the
Status LED. If a fan is not running with the transmitter on, turn
off the transmitter.
6-18 888-2339-002
WARNING: Disconnect primary power prior to servicing.