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Agilent Technologies 66332A, 6634B, 6633B, 6632B Troubleshooting, 1Sheet 5. OV at Turn-Oncontinued

Models: 6632B 6633B 66332A 6634B

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Figure 3-1 Sheet 5. OV at Turn-On (continued)

Troubleshooting - 3

Continued from sheet 4

Connect a DC coupled scope across the output and press Protect Clear several times while observing the scope

Go to "Troubleshooting

Pulses high?

High Output Voltage"

Yes

(sheet 12)

No

A1U306B-2,

U306B-8 3.8V?

U306B-7 < pin 8?

Check U306B, A2

No

Yes

Yes

OV_Detect*, High?

No

No

				Check OV_Prog,
				Imon_Comp, C335,
	Yes			Imon_Comp, C335,
	Yes			R350, R354
				R350, R354

A1R438,					Check R441, Q318B,
A1R438,		No			Check R441, Q318B,
OV_SCR*, +0.6V?		No			A2, Interface Board
OV_SCR*, +0.6V?					A2, Interface Board

Yes

Check A1CR342,

Q318A, B & D and

associated

components

Check R349, R351,

R356

Note: OV_SCR* is normally a pulse that goes low for 5us to trip the OV SCR, CR342.

Figure 3-1 Sheet 5. OV at Turn-On (continued)

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Agilent Technologies 66332A, 6634B, 6633B, 6632B service manual Troubleshooting, 1Sheet 5. OV at Turn-Oncontinued

Contents

Agilent Model 66332A System DC Power SupplyDynamic Measurement DC Source and Agilent Model 6632B, 6633B, 6634BWARRANTY Warranty InformationLIMITATION OF WARRANTY CERTIFICATIONBEFORE APPLYING POWER Safety SummaryDO NOT SERVICE OR ADJUST ALONE SAFETY SYMBOLSDescription Safety Symbol DefinitionsSymbol Item Description Printing HistoryInstrument Identification TROUBLESHOOTING Table of ContentsINTRODUCTION VERIFICATION AND PERFORMANCE TESTSDIAGRAMS REPLACEABLE PARTS LISTPRINCIPLES OF OPERATION INDEXPage Introduction Safety ConsiderationsOrganization Related DocumentsElectrostatic Discharge RevisionsManual Revisions Firmware RevisionsTest Equipment Required Verification and Performance TestsIntroduction Measurement Techniques Test Setup2 - Verification and Performance Tests Figure 2-1.Test SetupPerformance Tests Operation Verification TestsElectronic Load Current-MonitoringResistorConstant Voltage CV Tests CV SetupVoltage Programming and Readback Accuracy CV Load EffectVerification and Performance Tests CV Source EffectCV Noise PARD CC Setup Transient Recovery TimeConstant Current CC Tests Current Programming and Readback AccuracyLow Range Current Readback Accuracy Current Sink -CCOperationCC Load and Line Regulation Verification and Performance Tests2 - Verification and Performance Tests CC Load EffectCC Source Effect Verification and Performance Tests Performance Test Equipment FormCC Noise PARD 2 - Verification and Performance Tests Performance Test Record FormsVerification and Performance Tests 2 - Verification and Performance Tests Introduction TroubleshootingFlow Charts Overall Troubleshooting3 - Troubleshooting Test Equipment RequiredFigure 3-1Sheet 1. Main Flowchart TroubleshootingFigure 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 - TroubleshootingPower-on Self-testFailures Specific Troubleshooting ProceduresTroubleshooting Table 3-2. Self-TestError Codes/MessagesBias and Rail Voltages CV/CC Status Annunciators Troubleshooting3 - Troubleshooting Table 3-3.Bias and Reference VoltagesTroubleshooting J307 Voltage Measurements3 - Troubleshooting Disabling Protection FeaturesManual Fan Speed Control Calibration Password Inhibit Calibration SwitchPost-repairCalibration TroubleshootingUpgrade Procedure ROM UpgradeInitialization Identifying the FirmwareList of Required Tools Disassembly ProceduresTroubleshooting Figure 3-2.Component LocationA2 Interface Board, Removal and Replacement Cover, Removal and ReplacementFront Panel Assembly, Removal and Replacement 3 - TroubleshootingA3 Front Panel Board, Removal and Replacement S1 Line Switch, Removal and ReplacementT1 Power Transformer, Removal and Replacement A1 Main Control Board3 - Troubleshooting Line Voltage WiringFigure 3-3.Transformer Wiring Principles of Operation I/O Interface SignalsTable 4-1.Power Supply Interface signals IntroductionA2 Interface Circuits A3 Front Panel CircuitsPrimary Interface Secondary InterfaceFigure 4-1.A2/A3 Block Diagram Principles of Operation4 - Principles of Operation Power CircuitsA1 Main Board Circuits Principles of Operation Figure 4-2.A1 Block Diagram4 - Principles of Operation Control CircuitsPrinciples of Operation Page Table 5-1.Chassis, Electrical Replaceable Parts ListIntroduction Table 5-2.Chassis, Mechanical 5 - Replaceable PartsFigure 5-1.Mechanical Parts ldentification Replaceable Parts5 - Replaceable Parts Table 5-3.A1 Control Board PC Board AssemblyReplaceable 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 5-4.Binding Post Option #020 5 - Replaceable PartsTable 5-5.A5 AC input/RFI Board Table 5-6.Relay Option #760General Schematic Notes DiagramsIntroduction Table 6-1. Model-dependentComponentsTable 6-1. Model-dependentComponents continued 6 - DiagramsDesignator 66332ATable 6-2.A1 Board Component Locations DiagramsTable 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 Page Manual Updates