Specifications

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.
Access the fuses for the fan by removing the cover plate from
the center of the door and check for an open fuse. An open fuse
would indicate a defective fan or a loss of three phase power to
that fan.
If all the fans are operating, suspect the current monitor in the
Power Supply cabinet to be defective.
6.7 System Faults With No Indication On
The Front Panel
6.7.1 Circuit Breaker Tripping
Refer to troubleshooting Low Voltage supplies if a breaker has
tripped on the Power Supply Display panel.
This part of the troubleshooting section deals with problems that
may occur with the transmitter that cannot be diagnosed from
the Control front panel display.
6.7.2
Transmitter Does Not Turn On, No RED Indi-
cators on Control Front Panel.
6.7.2.1 A/C Check
a. Determine the presence of three phase and single phase
A/C. A quick check is to see if the A/C protection Circuit
active indicators on the Power Supply Display panel are
illuminated.
b. If any of these indicators are not illuminated GREEN,
measure the A/C input feeding the transmitter.
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. Due to the voltages present it will be necessary to clip
test leads between any 2 phases on the top of K2 and
route the test leads outside the transmitter to an A/C
voltmeter. Replace the cover before reapplying power.
Do not hold the meter in your hand.
2. Determine that the 3 phase line voltages are within 8%
of each other and not less than 80% of the rated supply.
If the line voltages are not in balance, the power source
should be checked in order to rectify the problem.
3. Repeat this procedure for all phasecombinations. Then
shut off all power at the wall disconnects, remove the
test leads and replace all covers before reapplying
power to the transmitter.
c. Verify that the transmitter starts from the Standby mode
when a Power button is depressed. This is indicated by all
LEDs illuminated on the Control front panel.
d. If the transmitter does not start from the Standby mode,
switch CB3 on the Power Supply Display panel to the
Normal position. If the LEDs do not illuminate refer to
the Troubleshooting Low Voltage Supplies procedure in
this section.
6.7.2.2 No Step-Start
a. If the transmitter does not start from the Standby mode
and no action of the step-start contactor is heard, check
DS1 and DS2 on the Transmitter Interface board. If either
of these is illuminated an open interlock exists. Refer to
the Transmitter Interface Section for a diagram of the
interlock flow.
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.
b. If no indicator on the Transmitter Interface is illuminated,
determine the presence of +22VDC at K3.
1. Since K3 is in a compartment with high voltages, it will
be necessary to clip test leads to the appropriate points
and then route the leads outside the transmitter to a
voltmeter. Be sure to replace all covers and doors
before returning power to transmitter.
2. If the 22VDC is not present, then an interlock is open.
Referto the TransmitterInterface Section for a diagram
of the Interlock Control String.
3. If the +22VDC is present on K3 Turn off the A/C
power, remove the meter leads and attach the cover
back in place.
c. Restore all A/C power to the transmitter and check U43-7
on the Controller for a Low pulse when a power button is
depressed.
1. If a pulse is not observed, refer to the Controller
Troubleshooting Section to continue.
2. If a pulse is observed on U43-7, check K3, K1 and the
wiring at TB4 in the Power Supply Cabinet.
6.7.2.3 Step Start Pulls In, Run Contactor Does Not
a. If the transmitter step start contactor pulls in and then
drops out without the Run Contactor pulling in,
888-2339-002 6-19
WARNING: Disconnect primary power prior to servicing.