REF.
CONTROL/INDICATOR
FUNCTION
10 OUTPUT MONITOR, BAND-
PASS FILTER VSWR indicator
Bicolor LED indicator. GREEN indicates that there is low reflected power at the input of
the bandpass filter; RED indicates that reflected power at the filter input is above the level
set by the VSWR trip adjust control.
11 OUTPUT MONITOR, +5 V
supply status indicator
Bicolor LED indicator. Indicates status of +5 Volt supply on the Output Monitor board.
GREEN ind5 Volts present; RED ind5 Volt supply fault.
12 OUTPUT MONITOR, -5V sup-
ply status indicator
Bicolor LED indicator. Indicates status of -5 Volt supply on the Output Monitor board.
GREEN indicates -5 Volts present; RED indicates -5 Volt supply fault.
13 OUTPUT MONITOR, ANT.
VSWR, status indicator
Bicolor LED indicator. Indicates VSWR status. RED indicates that VSWR at the transmit-
ter’s 50 Ohm point is above the threshold set by “VSWR Trip Adjust” control. GREEN in-
dicates low VSWR.
14 VSWR SENSOR, “STATUS”
indicator (VSWR Self-Test re-
sult)
Bicolor LED indicator.Indicates result of “VSWR Self-Test.” RED indicates VSWR logic
fault, GREEN indicates VSWR protection logic is functioning normally. (“VSWR self-
test” can be initiated manually with “VSWR SENSOR, Manual Test,” and is performed
automatically whenever AC power is restored.
15 VSWR SENSOR, MANUAL
TEST, pushbutton
Used to test operation of VSWR logic, result of test is displayed on VSWR SENSOR,
STATUS indicator (Ref. 14, above). When the pushbutton is depressed, both the Bandpass
Filter and Antenna VSWR status indicators will momentarily go red, then Sensor Status In-
dicator will indicate green if VSWR logic is functioning properly. DO NOT TEST WHILE
TRANSMITTER IS ON AIR.
16 OVER DRIVE, status indicator RED indicates excessive RF drive level to the Power Amplifier. GREEN indicates drive
level is below the Overdrive threshold.
17 UNDER DRIVE, status indica-
tor
RED indicates low RF drive level to the Power Amplifier. GREEN indicates drive level
above the preset threshold. Red can also indicate a short in the PA power supply.
18 SUPPLY FAULT, overload indi-
cator
RED indicates that the Power Supply Protection circuit has detected a PA Power Supply
fault (an imbalance in three phase voltages from transformer T1, caused by loss of one
phase or phase imbalance on incoming primary power. GREEN indicates no fault.
19 OVER CURRENT, overload in-
dicator
GREEN status indicates normal status; RED indicates that either average or peak supply
current has exceeded preset levels.
20 OVER VOLTAGE, overload in-
dicator
Bicolor LED indicator. GREEN indicates normal status; RED indicates main power supply
voltage has exceeded 260 Volts DC.
21 RESET pushbutton
Resets the overload indicators; when depressed, overload indicators will change from RED
to GREEN if the cause of the overload has been cleared. Depressing the RESET button
will also reset the Bandpass and Antenna VSWR fault indicators.
22 DOOR INTERLOCKS, status
indicator
Bicolor LED indicator. GREEN indicates all doors are closed; RED indicates that a door is
open, or not fully closed.
23 AIR INTERLOCKS, status in-
dicator
Bicolor LED indicator. GREEN indicates proper air flow, RED indicates “air flow fault.”
24 EXT. INTERLOCKS, status in-
dicator
Bicolor LED indicator. Indicates status of external interlocks. GREEN indicates a com-
pleted circuit; RED indicates an open circuit.
25 MODULATION ENCODER,
CABLE INTERLOCK, status
indicator
Bicolor LED indicator. Indicates status of cables between the MODULATION ENCODER
board and the Combiner/Motherboards. It also indicates when any RF Amplifier module is
not properly inserted into the motherboard. GREEN indicates all cables and modules are
properly installed; RED indicates that a cable or module is not installed or connected.
Table 3A-3. Status Panel, Controls and Indicators (Cont.)
DX-25U
3A-4
888-2297-002
Rev AA: 8/9/2000
WARNING: Disconnect primary power prior to servicing.
