Manuals / Agilent Technologies / Home Audio / Stereo System

Agilent Technologies 6633B, 6634B, 66332A Troubleshooting, 1Sheet 6. FS Indicated but Fuse OK

Models: 6632B 6633B 66332A 6634B

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Figure 3-1 Sheet 6. FS Indicated but Fuse OK

3 - Troubleshooting

Program output on, voltage and current full scale then check output voltage

FS Prot off and Output OK?

		Calibrate unit
Yes		Calibrate unit

Disable the protection feature by simultaneously pressing the 0 and 9 keys, press the ^ key until the display reads "No Protect Off", press the Up Arrow to display "No Protect On" then press enter

Output V >			Go to "Troubleshooting
programmed		Yes	High Output Voltage"
programmed		Yes	High Output Voltage"
value?			(sheet 12)



	No

Check FUSE signal U305B-7 (approx.

+2.8V with 20V output)

		Troubleshoot Fuse
FUSE signal OK?		divider and amplifier
	No	divider and amplifier
		circuit (R393/394,

		U305)

Yes

Problem may be defective A2 or one of the voltages to A2 (Vmon, Imon_H, Imon_L, Imon_P) > its' bias voltage +5Vs

Figure 3-1 Sheet 6. FS Indicated but Fuse OK

Page 30

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Agilent Technologies 6633B, 6634B, 66332A, 6632B service manual Troubleshooting, 1Sheet 6. FS Indicated but Fuse OK

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 SYMBOLSSafety Symbol Definitions SymbolDescription Printing History Instrument IdentificationItem Description INTRODUCTION Table of ContentsTROUBLESHOOTING VERIFICATION AND PERFORMANCE TESTSPRINCIPLES OF OPERATION REPLACEABLE PARTS LISTDIAGRAMS INDEXPage Organization Safety ConsiderationsIntroduction Related DocumentsManual Revisions RevisionsElectrostatic Discharge Firmware RevisionsVerification and Performance Tests IntroductionTest Equipment Required 2 - Verification and Performance Tests Test SetupMeasurement Techniques Figure 2-1.Test SetupElectronic Load Operation Verification TestsPerformance Tests Current-MonitoringResistorVoltage Programming and Readback Accuracy CV SetupConstant Voltage CV Tests CV Load EffectCV Source Effect CV Noise PARDVerification 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 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 Introduction3 - Troubleshooting Overall TroubleshootingFlow Charts 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 VoltageTroubleshooting Specific Troubleshooting ProceduresPower-on Self-testFailures Table 3-2. Self-TestError Codes/Messages3 - Troubleshooting CV/CC Status Annunciators TroubleshootingBias and Rail Voltages Table 3-3.Bias and Reference VoltagesJ307 Voltage Measurements TroubleshootingDisabling Protection Features Manual Fan Speed Control3 - Troubleshooting Post-repairCalibration Inhibit Calibration SwitchCalibration Password TroubleshootingInitialization ROM UpgradeUpgrade Procedure Identifying the FirmwareTroubleshooting Disassembly ProceduresList of Required Tools Figure 3-2.Component LocationFront 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 BoardLine Voltage Wiring Figure 3-3.Transformer Wiring3 - Troubleshooting Table 4-1.Power Supply Interface signals I/O Interface SignalsPrinciples of Operation IntroductionPrimary Interface A3 Front Panel CircuitsA2 Interface Circuits 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 Table 5-5.A5 AC input/RFI Board 5 - Replaceable PartsTable 5-4.Binding Post Option #020 Table 5-6.Relay Option #760Introduction DiagramsGeneral Schematic Notes Table 6-1. Model-dependentComponentsDesignator 6 - DiagramsTable 6-1. Model-dependentComponents continued 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