Harris Gates Two 994 9203 002 - Page 12

Symptom:ImbalanceInOutputPulseWidths ........F-2
AudioImbalance............................F-2
TriangleWaveImbalance.....................F-2
Symptom: Output(s) At J2 Always In A High State,
Causing One or More Pdm Amplifiers to Conduct
FullTime.....................................F-2
Symptom:OnlyOneOutputHigh..................F-3
Symptom:TwoOutputsAreHigh..................F-3
Symptom:AllFourOutputsAreHigh ..............F-3
SECTION G
PDM AMPLIFIER/PULL-UP (A6-A9)
PrinciplesofOperation............................ G-1
PDMAmplifier................................ G-1
PDMPull-UpBoard............................ G-1
Maintenance .................................... G-1
PDMAmplifiers............................... G-1
GateDriveChecks............................. G-1
In-Circuit Ohmmetering the PDM Amp Module (A6
thruA9)MOSFET’s........................... G-2
CheckingGateDrive........................ G-4
HandlingMOSFET’s............................. G-4
TestingMOSFET’s............................... G-4
SECTION H
PDM FILTER (A10 and A11)
PrinciplesofOperation............................ H-1
SECTION J
CONTROLLER BOARD (A12)
PrinciplesofOperation............................. J-1
CoarsePowerLevelControl ...................... J-1
ContactorControl............................... J-1
FinePowerControl.............................. J-1
Metering ...................................... J-1
OverloadCircuitry .............................. J-1
OtherFaultDetection............................ J-2
ControllerSupplyVoltages........................J-2
Replacement/AlignmentProcedures...................J-2
PAVoltageElectricalZero........................J-2
PAVoltMeterCalibration ........................J-2
Power Supply Current Calibration ..................J-2
PowerOutputCalibration.........................J-3
OverloadAdjustmentProcedures.....................J-3
Power Supply Current Overload ....................J-3
UnderdriveFault ................................J-3
VSWRDetector.................................J-3
Troubleshooting the Controller .......................J-3
Symptom: Will Not Respond To An On Command ....J-3
Controller Supply Failure......................J-3
Failedflipflopcircuitry.......................J-3
Symptom: PDM Power Level Signal Cannot Be Con-
trolled ........................................J-3
Symptom:MultimeterIsPinnedFarLeftorRight.....J-3
Symptom: Some Remote Control Functions Do Not
Work.........................................J-3
SECTION K
INTERFACE BOARD (A24)
PrinciplesofOperation............................ K-1
Replacement/Alignment............................ K-1
Troubleshooting ..................................K-1
Symptom: Green Power Level Status LED’s Light On
Controller,ButTheContactorsDoNotEnergize..... K-1
OpenInterlock............................. K-1
24VACMissing............................ K-1
ONCommandMissing ......................K-1
BadTriacorOpticalIsolator.................. K-1
APPENDIX L
TEST EQUIPMENT
Introduction..................................... L-1
x 888-2314-001 Rev. X
WARNING: Disconnect primary power prior to servicing.