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Agilent Technologies 6634B, 66332A, 6633B, 6632B Troubleshooting, 1Sheet 12. High Output Voltage

Models: 6632B 6633B 66332A 6634B

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Figure 3-1 Sheet 12. High Output Voltage

3 - Troubleshooting

Disable the OV capability by

shorting R351. After the

protection is disabled, program

the output voltage to zero,

current to full scale and Output ON. If the unit is in "Protect" mode, Press Protect Clear. The output should now go high and not trip the OV.

*V_mon should be approximately 6632B or 66332A Vout/4.25

6633B Vout/10.52

6634B Vout/21

Is the CV

annunciator on

Yes

Measure voltage at the base of Q303 with respect to its' emitter

Voltage <0.6V

Yes

	Vmon,		Check Voltage Monitor
No	U315B-7,	No	Amplifier, U315B
No	U315B-7,	No	Amplifier, U315B
	OK ?*		circuit

Yes

CV_Prog,

R401 No A2 Interface Board

~0V

Yes

Check Voltage Control

U315A, circuit

	No	Troubleshoot Voltage
	No	Gain Stage
		Gain Stage

Troubleshoot Output

Stage

Figure 3-1 Sheet 12. High Output Voltage

Page 36

Image 36

Agilent Technologies 6634B, 66332A, 6633B, 6632B service manual Troubleshooting, 1Sheet 12. High Output Voltage

Contents

System DC Power Supply Agilent Model 66332ADynamic Measurement DC Source and Agilent Model 6632B, 6633B, 6634BWarranty Information WARRANTYLIMITATION OF WARRANTY CERTIFICATIONSafety Summary BEFORE APPLYING POWERDO NOT SERVICE OR ADJUST ALONE SAFETY SYMBOLSSafety Symbol Definitions SymbolDescription Printing History Instrument IdentificationItem Description Table of Contents TROUBLESHOOTINGINTRODUCTION VERIFICATION AND PERFORMANCE TESTSREPLACEABLE PARTS LIST DIAGRAMSPRINCIPLES OF OPERATION INDEXPage Safety Considerations IntroductionOrganization Related DocumentsRevisions Electrostatic DischargeManual Revisions Firmware RevisionsVerification and Performance Tests IntroductionTest Equipment Required Test Setup Measurement Techniques2 - Verification and Performance Tests Figure 2-1.Test SetupOperation Verification Tests Performance TestsElectronic Load Current-MonitoringResistorCV Setup Constant Voltage CV TestsVoltage Programming and Readback Accuracy CV Load EffectCV Source Effect CV Noise PARDVerification and Performance Tests Transient Recovery Time CC SetupConstant Current CC Tests Current Programming and Readback AccuracyCurrent Sink -CCOperation Low Range Current Readback AccuracyCC Load and Line Regulation Verification and Performance TestsCC Load Effect CC Source Effect2 - Verification and Performance Tests Performance Test Equipment Form CC Noise PARDVerification and Performance Tests Performance Test Record Forms 2 - Verification and Performance TestsVerification and Performance Tests 2 - Verification and Performance Tests Troubleshooting IntroductionOverall Troubleshooting Flow Charts3 - Troubleshooting Test Equipment RequiredTroubleshooting Figure 3-1Sheet 1. Main Flowchart3 - Troubleshooting Figure 3-1Sheet 2. Main Flowchart continuedTroubleshooting Figure 3-1Sheet 3. Main Flowchart continued3 - Troubleshooting Figure 3-1Sheet 4. OV at Turn-OnTroubleshooting Figure 3-1Sheet 5. OV at Turn-Oncontinued3 - Troubleshooting Figure 3-1Sheet 6. FS Indicated but Fuse OKTroubleshooting Figure 3-1Sheet 7. No Output Voltage3 - Troubleshooting Figure 3-1Sheet 8. No Output Voltage continuedTroubleshooting Figure 3-1Sheet 9 No Output Voltage continued3 - Troubleshooting Figure 3-1Sheet 10. No Current LimitTroubleshooting Figure 3-1Sheet 11. Unit Does Not OV3 - Troubleshooting Figure 3-1Sheet 12. High Output VoltageSpecific Troubleshooting Procedures Power-on Self-testFailuresTroubleshooting Table 3-2. Self-TestError Codes/MessagesCV/CC Status Annunciators Troubleshooting Bias and Rail Voltages3 - Troubleshooting Table 3-3.Bias and Reference VoltagesJ307 Voltage Measurements TroubleshootingDisabling Protection Features Manual Fan Speed Control3 - Troubleshooting Inhibit Calibration Switch Calibration PasswordPost-repairCalibration TroubleshootingROM Upgrade Upgrade ProcedureInitialization Identifying the FirmwareDisassembly Procedures List of Required ToolsTroubleshooting Figure 3-2.Component LocationCover, Removal and Replacement A2 Interface Board, Removal and ReplacementFront Panel Assembly, Removal and Replacement 3 - TroubleshootingS1 Line Switch, Removal and Replacement A3 Front Panel Board, Removal and ReplacementT1 Power Transformer, Removal and Replacement A1 Main Control BoardLine Voltage Wiring Figure 3-3.Transformer Wiring3 - Troubleshooting I/O Interface Signals Principles of OperationTable 4-1.Power Supply Interface signals IntroductionA3 Front Panel Circuits A2 Interface CircuitsPrimary Interface Secondary InterfacePrinciples of Operation Figure 4-1.A2/A3 Block DiagramPower Circuits A1 Main Board Circuits4 - Principles of Operation Figure 4-2.A1 Block Diagram Principles of OperationControl Circuits 4 - Principles of OperationPrinciples of Operation Page Replaceable Parts List IntroductionTable 5-1.Chassis, Electrical 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 5 - Replaceable Parts Table 5-4.Binding Post Option #020Table 5-5.A5 AC input/RFI Board Table 5-6.Relay Option #760Diagrams General Schematic NotesIntroduction Table 6-1. Model-dependentComponents6 - Diagrams Table 6-1. Model-dependentComponents continuedDesignator 66332ADiagrams Table 6-2.A1 Board Component Locations6 - Diagrams Table 6-2continuedFigure 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 Page Manual Updates