Specifications

6.8.3 Controller Breaker (CB2) Trips
If CB2 trips when CB1 is set to the on position:
a. Turn off A/C power.
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.
b. Disconnect wires 161 and 162 from CR46.
c. Turn the transmitter back on.
d. If CB2 trips, then suspect:
1. Rectifier, CR46
2. Transformer T5, or
3. A weak CB2.
e. If CB2 does not trip, then suspect:
1. A short on the +12 Volt line. This could be a cabling
short or a failure on one of the boards. Use the Overall
wiring diagram and individual board sections to trace
the problem.
2. Defective filter capacitor C7, or
3. Defective bleeder resistor R7.
6.8.4
Servo Supply Breaker (CB6) Trips
If CB6 trips when CB1 is set to the on position:
a. Turn off A/C power.
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.
b. Disconnect wires 190, 191, and 192 from CR49 and
CR48.
c. Turn the transmitter back on.
d. If CB6 trips, then suspect:
1. Rectifier, CR49 or CR48
2. Transformer T7, or
3. A weak CB6.
e. If CB6 does not trip, then suspect:
1. A short on the +24VDC, +20VDC, or -20VDC line.
This could be a cabling short or a failure on one of the
bandswitched circuits or servo assemblies. Use the
Overall wiring diagram and individual board sections
to trace the problem.
2. Defective filter capacitor C18, C19, or C20.
6.8.5
Supply Missing
If one or more of the supplies are missing on the Control
Multimeter, check TB3 in the Power Supply Cabinet terminals
1 through 11, for the following voltages:
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.
TB3-1 +22
TB3-2 -22
TB3-3 +8
TB3-4 -8
TB3-5 +12
TB3-6 B+
TB3-7 B-
TB3-8 Ground
TB3-9 +24
TB3-10 +20
TB3-11 -20
If these voltages are all present then check interconnect cabling
and the Power distribution boards for an open. Refer to the
Overall wiring diagram as needed.
If all of these voltages are missing:
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. Check for 240VAC on the Primary of T6 by connecting
test leads to T6 and routing those leads outside the trans-
mitter to a voltmeter. Be sure to replace the cover before
turning on any voltage.
1. If there is no voltage on T6, remove the test leads and
check CB4 and CB1 for an open.
2. If there is voltageon the primary ofT6, andone or more
of the voltages are missing, check the following com-
ponents associated with that supply:
+-22 CR43, C9, C10, T6
+-8 CR45, C13, C1, T6
B-B+ CR44, C10, C11, T6
+12 CR46, C7, T5
888-2339-002 6-21
WARNING: Disconnect primary power prior to servicing.