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Agilent Technologies 6634B, 66332A, 6633B Manual Fan Speed Control, Disabling Protection Features

Models: 6632B 6633B 66332A 6634B

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3 - Troubleshooting

Manual Fan Speed Control

Under some circumstances such as testing acoustical devices where the fan noise would interfere with the test, it would be advantageous to reduce the fan speed. If the test requires a very light load, the ambient temperature is low and the duration of the test is short, the fan speed may be temporarily reduced. The turn-on default is "Automatic" so this procedure must be performed, as needed, every time the line voltage is turned on. To manually control the fan speed:

a.Simultaneously depress the "0" and "9” keys. EEINIT <model> will be displayed.

b.Using the Up/Down annunciator keys select FAN:MODE<AUTO.>.

c.Using the Up/Down arrows select FAN:MODE <MAN>

d.Press "Enter"

e.Simultaneously depress the "0" and "9" keys. EEINIT <model> will be displayed.

f.Using the Up/Down annunciator keys select FAN:SPEED <data>

g.Press "Enter Number".

h.Enter the desired speed (numeric entry range is 0 to 100%)

i.Press "Enter"

Disabling Protection Features

Except for overvoltage protection, the power supply's protection features may be disabled. This is not recommended as a normal operating condition but is helpful under some circumstances such as troubleshooting. The turn-on default is "NO-PROTECT OFF" (protection enabled) so this procedure must be performed, as needed, every time the line voltage is turned on. To disable the protection:

a.Simultaneously depress the "0" and "9" keys. EEINIT <model> will be displayed.

b.Using the Up/Down annunciator keys select NO-PROTECT <OFF>.

c.Using the Up/Down arrows select NO-PROTECT <ON>.

d.Press "Enter"

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Agilent Technologies 6634B, 66332A, 6633B, 6632B Manual Fan Speed Control, Disabling Protection Features, Troubleshooting

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 SYMBOLSSymbol Safety Symbol DefinitionsDescription Instrument Identification Printing HistoryItem Description Table of Contents TROUBLESHOOTINGINTRODUCTION VERIFICATION AND PERFORMANCE TESTSREPLACEABLE PARTS LIST DIAGRAMSPRINCIPLES OF OPERATION INDEXPage Safety Considerations IntroductionOrganization Related DocumentsRevisions Electrostatic DischargeManual Revisions Firmware RevisionsIntroduction Verification and Performance TestsTest 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 Noise PARD CV Source EffectVerification 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 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 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 TroubleshootingManual Fan Speed Control Disabling Protection Features3 - 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 BoardFigure 3-3.Transformer Wiring Line Voltage 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 DiagramA1 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 Introduction Replaceable Parts ListTable 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