Manuals / Agilent Technologies / Home Audio / Stereo System

Agilent Technologies 6633B, 6634B, 66332A, 6632B 1Sheet 10. No Current Limit, Troubleshooting

Models: 6632B 6633B 66332A 6634B

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Figure 3-1 Sheet 10. No Current Limit

3 - Troubleshooting

Continued from sheet 2

CC_Prog, R360,

Check A2 Interface

No

Board

-4.8V

?

Yes

Imon_H, U309A-6

Drop across R473

Check R473

No

No

~+3.5V

~0.25V

?

?

Yes

Yes

Check Positive Current

Control Circuit

Check High Range

Current Monitor

Amplifier

Figure 3-1 Sheet 10. No Current Limit

34

Image 34

Agilent Technologies 6633B, 6634B, 66332A, 6632B service manual 1Sheet 10. No Current Limit, Troubleshooting

Contents

Dynamic Measurement DC Source System DC Power SupplyAgilent Model 66332A and Agilent Model 6632B, 6633B, 6634BLIMITATION OF WARRANTY Warranty InformationWARRANTY CERTIFICATIONDO NOT SERVICE OR ADJUST ALONE Safety SummaryBEFORE APPLYING POWER SAFETY SYMBOLSSymbol Safety Symbol DefinitionsDescription Printing History Instrument IdentificationINTRODUCTION Table of ContentsTROUBLESHOOTING VERIFICATION AND PERFORMANCE TESTSPRINCIPLES OF OPERATION REPLACEABLE PARTS LISTDIAGRAMS INDEXPage Organization Safety ConsiderationsIntroduction Related DocumentsManual Revisions RevisionsElectrostatic Discharge Firmware RevisionsIntroduction Verification and Performance TestsTest Equipment Required Measurement Techniques Test SetupFigure 2-1.Test Setup 2 - Verification and Performance TestsElectronic Load Operation Verification TestsPerformance Tests Current-MonitoringResistorVoltage Programming and Readback Accuracy CV SetupConstant Voltage CV Tests CV Load EffectCV Noise PARD CV Source EffectVerification and Performance Tests Constant Current CC Tests Transient Recovery TimeCC Setup Current Programming and Readback AccuracyCC Load and Line Regulation Current Sink -CCOperationLow Range Current Readback Accuracy Verification and Performance TestsCC Source Effect CC Load Effect2 - Verification and Performance Tests CC Noise PARD Performance Test Equipment FormVerification and Performance Tests Performance Test Record Forms 2 - Verification and Performance TestsVerification and Performance Tests 2 - Verification and Performance Tests Troubleshooting Introduction3 - Troubleshooting Overall TroubleshootingFlow Charts Test Equipment RequiredTroubleshooting Figure 3-1Sheet 1. Main FlowchartFigure 3-1Sheet 2. Main Flowchart continued 3 - TroubleshootingFigure 3-1Sheet 3. Main Flowchart continued TroubleshootingFigure 3-1Sheet 4. OV at Turn-On 3 - TroubleshootingFigure 3-1Sheet 5. OV at Turn-Oncontinued TroubleshootingFigure 3-1Sheet 6. FS Indicated but Fuse OK 3 - TroubleshootingFigure 3-1Sheet 7. No Output Voltage TroubleshootingFigure 3-1Sheet 8. No Output Voltage continued 3 - TroubleshootingFigure 3-1Sheet 9 No Output Voltage continued TroubleshootingFigure 3-1Sheet 10. No Current Limit 3 - TroubleshootingFigure 3-1Sheet 11. Unit Does Not OV TroubleshootingFigure 3-1Sheet 12. High Output Voltage 3 - TroubleshootingTable 3-2. Self-TestError Codes/Messages Specific Troubleshooting ProceduresPower-on Self-testFailures TroubleshootingTable 3-3.Bias and Reference Voltages CV/CC Status Annunciators TroubleshootingBias and Rail Voltages 3 - TroubleshootingJ307 Voltage Measurements TroubleshootingManual Fan Speed Control Disabling Protection Features3 - Troubleshooting Post-repairCalibration Inhibit Calibration SwitchCalibration Password TroubleshootingInitialization ROM UpgradeUpgrade Procedure Identifying the FirmwareFigure 3-2.Component Location Disassembly ProceduresList of Required Tools TroubleshootingFront Panel Assembly, Removal and Replacement Cover, Removal and ReplacementA2 Interface Board, Removal and Replacement 3 - TroubleshootingT1 Power Transformer, Removal and Replacement S1 Line Switch, Removal and ReplacementA3 Front Panel Board, Removal and Replacement A1 Main Control BoardFigure 3-3.Transformer Wiring Line Voltage Wiring3 - Troubleshooting Principles of Operation I/O Interface SignalsTable 4-1.Power Supply Interface signals IntroductionPrimary Interface A3 Front Panel CircuitsA2 Interface Circuits Secondary InterfaceFigure 4-1.A2/A3 Block Diagram Principles of OperationA1 Main Board Circuits Power Circuits4 - Principles of Operation Figure 4-2.A1 Block Diagram Principles of OperationControl Circuits 4 - Principles of OperationPrinciples of Operation Page Table 5-1.Chassis, Electrical Replaceable Parts ListIntroduction 5 - Replaceable Parts Table 5-2.Chassis, MechanicalReplaceable Parts Figure 5-1.Mechanical Parts ldentificationTable 5-3.A1 Control Board PC Board Assembly 5 - Replaceable PartsReplaceable Parts - 5 - Replaceable Parts Replaceable Parts 5 - Replaceable Parts Replaceable Parts 5 - Replaceable Parts Replaceable Parts 5 - Replaceable Parts Replaceable Parts 5 - Replaceable Parts Replaceable Parts Table 5-6.Relay Option #760 Table 5-4.Binding Post Option #020Table 5-5.A5 AC input/RFI Board 5 - Replaceable PartsTable 6-1. Model-dependentComponents DiagramsGeneral Schematic Notes Introduction6 - Diagrams Table 6-1. Model-dependentComponents continuedDiagrams Table 6-2.A1 Board Component LocationsTable 6-2continued 6 - DiagramsFigure 6-1.A1 Board Component Locations Figure 6-2.A4 and A6 Board Component Locations Figure 6-3.A1 Board schematic sheet A1 Board schematic sheet A1 Board schematic sheet Figure 6-4.A6 Relay Option Board schematic Index