Harris DX 25U - Table of Contents

TABLE OF CONTENTS
Section I
Introduction/Specifications
Introduction......................................1-1
ScopeandPurpose..............................1-1
EquipmentDescription.............................1-1
BlockDiagram ...................................1-1
Specifications ....................................1-1
Section II
Installation/Initial Turn On
Introduction......................................2-1
DeliveryAndStorage..............................2-1
ReturnsAndExchanges............................ 2-1
Unpacking.......................................2-1
FactoryTestData.................................2-2
Transmitter Placement .............................2-2
RemovingtheCombinerCrossoverBar .............2-2
CabinetPositioning..............................2-2
CabinetBolts...................................2-3
CabinetGroundStrap............................2-3
CabinetGroundingPlate..........................2-3
AirSystemAndCooling ...........................2-3
ElectricalInstallation ..............................2-3
StepStartPanel.................................2-3
ACPower..................................... 2-3
InterconnectionWiring...........................2-4
Transformer Tap Settings .........................2-4
Component Installation.............................2-4
PACombinerOutputBar.........................2-4
Transmitter Grounding ............................. 2-4
RFOutputConnection.............................2-5
DummyAntennaInformation......................2-5
Customer Interface Connections......................2-5
AudioInput....................................2-5
Modulation Monitor Connection ...................2-6
FrequencyMonitorConnection.....................2-6
ExternalRFInput...............................2-6
ExternalInterlock(Failsafe).......................2-6
Pre-TurnOnChecks(Mechanical)....................2-7
Pre-TurnOnChecks(Electrical).....................2-7
InitialTurnOnProcedure...........................2-7
Power Supply Test ..............................2-7
UnderdriveOverloadTest ........................2-8
PAPowerSupplyCheck .........................2-8
FanRotationCheck .............................2-8
DriverOperationCheck..........................2-9
Raise/LowerFunctionCheck......................2-9
PowerAmplifierstageTurnOnCheck..............2-9
Setting Modulation Monitor Sample Levels .........2-10
Modulation Check..............................2-12
Setting Audio Input Level .......................2-12
AudioInputPhasingCheck(Optional)..............2-12
ControllerBatteryBackup.......................2-12
RecordingNormalMeterReadings................2-13
AMStereoInstallationandTuningHints.............2-13
InterfacingForStereo...........................2-13
BandpassTuning2C1...........................2-13
RemoteControlConnections.......................2-13
ControlInputs ................................ 2-13
AnalogMonitoringOutputs ..................... 2-13
StatusMonitoringOutputs....................... 2-13
Section III
Operators Guide
Introduction ..................................... 3-1
OperatingProcedures.............................. 3-1
Daily Preoperational Checkout ...................... 3-1
Transmitter Turn-On Procedure ..................... 3-1
Transmitter Turn-Off Procedure ..................... 3-1
Transmitter Operations ............................ 3-2
RoutineMeterReadings......................... 3-2
Fault Conditions................................ 3-2
Section IIIA
Controls and Indicators
Section IV
Overall System Theory
Introduction ..................................... 4-1
BlockDiagramDescription......................... 4-1
RFSection.................................... 4-1
AudioandModulationSection.................... 4-2
ControllerSection.............................. 4-2
PowerSupplies ................................ 4-2
LowVoltagePowerSupply:CircuitDescription........ 4-2
PowerDistributionBoard,A39.................... 4-4
PAPowerSupply:CircuitDescription................ 4-4
StepStartPanel................................ 4-4
PA Supply Discharge Circuit (Crowbar) ............ 4-4
PowerSupplyShortingSwitches.................. 4-4
PA Power Supply Transformer T1 ................. 4-4
InterphaseTransformerT3 ....................... 4-4
+230 VDC Supply.............................. 4-4
+115 VDC and +60 VDC Supplies ................ 4-4
SupplyCurrentMeter,M2 ....................... 4-5
Secondary Winding Fuses........................ 4-5
SupplyFuses.................................. 4-5
FanMotorFuses............................... 4-5
A24andA25FuseBoardSampleCircuits........... 4-5
ACPowerProtectionCircuits..................... 4-5
OvervoltageandUndervoltageProtection........... 4-5
LossofPhaseand“Brown-Out”Protection.......... 4-5
AirSystemandSensingCircuits .................... 4-5
Fans ......................................... 4-6
AirFlowandTemperatureSensing ................ 4-6
Interlocks....................................... 4-6
DoorInterlockCircuit........................... 4-6
ExternalInterlockCircuit ........................ 4-6
RFCircuits...................................... 4-6
RF Drive Splitter, A15 .......................... 4-6
RFDriveCables ............................... 4-6
PowerAmplifierDescription...................... 4-7
CombinerDescription........................... 4-7
RFSamplesfromtheOutputCombiner............. 4-8
OutputNetworkDescription........................ 4-8
Bandpass Filter................................. 4-8
PIMatchingNetwork ........................... 4-8
iv 888-2297-002 8/9/2000
WARNING: Disconnect primary power prior to servicing.