Agilent Technologies 6633B CV/CC Status Annunciators Troubleshooting, Bias and Rail Voltages

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3 - Troubleshooting

CV/CC Status Annunciators Troubleshooting

The CV/CC annunciators are particularly helpful when troubleshooting a unit with no output. If the unit has no output voltage or current and one of the annunciators is on then the problem is in the control circuit associated with that annunciator. An example of how this might be useful would be in a case where the voltage and current are programmed to some positive value, there is no output voltage and the CV annunciator is on. This indicates that the problem is probably in the Voltage Amplifier circuit. If the CC annunciator were on then the problem would likely be in the Current Amplifier. If UNR is indicated then neither the voltage nor the current circuits are in control and the problem would be in circuits after the gating diodes such as the driver or output regulator stages.

When troubleshooting the CV/CC status annunciators or the status readback circuits, first measure the voltage drop across the gating diodes; A1 D328 (CV) and D325 (CC). A conducting diode indicates an active (ON) control circuit. This forward drop is applied to the input of the associated status comparator (U306A and D respectively) and drives the output (CV_DETECT* or CC_DETECT*) low. The low signal indicates an active status which is sent to the A2 board microprocessor. The front panel CV annunciator indicates when the CV mode is active (CV_DETECT* is low). The front panel CC annunciator indicates when the CC mode is active (CC_DETECT* is low). The UNREGULATED (UNR) annunciator comes on when neither the CV nor CC is active.

Bias and Rail Voltages

Before troubleshooting any circuit check the bias and/or rail voltages to make sure that they are not the cause. Table 3-3 lists the bias and rail voltage test points for the A1 Main Control , A2 Interface, and the A3 Front Panel/Display boards. Unless otherwise noted, all voltages are measured with respect to secondary common (R473-3) with no load on the supply.

Table 3-3. Bias and Reference Voltages

Bias

Test Point

Common

Measurement

 

(See Figure 6-1)

 

 

 

+Rail1 (Agilent

A1 TP 310

- Output

+38V

10% (800mV P/P)

6632B/66332B)

 

 

 

 

+Rail1 (Agilent 6633B)

A1 TP 310

- Output

+73V

10% (2.5V P/P)

+Rail1 (Agilent 6634B)

A1 TP 310

- Output

+130V 10% (2.2V P/P)

-Rail1(Agilent

A1 TP 311

- Output

-9.8V 10% (400mV P/P)

6632B/66332B)

 

 

 

 

-Rail1(Agilent 6633B)

A1 TP 311

- Output

-10.2V 10% (300mV P/P)

-Rail1(Agilent 6634B)

A1 TP 311

- Output

-10.5V 10% (300mV P/P)

+5V secondary

A1 R317

Secondary Common

+5V 4%

+12V secondary

A1 D470 cathode

Secondary Common

+12V

5%

+15V secondary

A1 R318

Secondary Common

+15V

4%

-12V secondary

A1 D471 anode

Secondary Common

-12V 5%

-15V secondary

A1 R315

Secondary Common

-15V 4%

V_Ref

A1 R475

Secondary Common

+2.5V 6%

+5V Interface2

E306 (red wire)

E 306 (black wire)

+5V 3%

1Measured with respect to - Output at nominal ac input line voltage

2Measured with reference to Interface Ground (E306 black wire)

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Contents Agilent Part No Microfiche No October Warranty Information CertificationSafety Summary Before Applying PowerSafety Symbol Definitions Symbol DescriptionItem Description Printing HistoryInstrument Identification Table of Contents Introduction General Schematic Notes Backdating Initialization ROM UpgradeDisassembly Procedures Post-repair CalibrationPage Related Documents Safety ConsiderationsOrganization ChapterManual Revisions RevisionsElectrostatic Discharge Firmware RevisionsTest Equipment Required Type Specifications Recommended ModelIntroduction Built-in Self TestsTest Setup Measurement TechniquesElectronic Load Operation Verification TestsPerformance Tests Current-Monitoring ResistorVoltage Programming and Readback Accuracy CV SetupConstant Voltage CV Tests CV Load EffectCV Source Effect CV Noise PardConstant Current CC Tests Transient Recovery TimeCC Setup Current Programming and Readback AccuracyCC Load and Line Regulation Current Sink -CC OperationLow Range Current Readback Accuracy CC Load Effect CC Source EffectPerformance Test Equipment Form CC Noise PardPerformance Test Record Forms − 4 mV + 4 mV Vout − 42 mV Model Agilent 6634B Report No Date Test Description MinimumVout − 12 mV Iout + 0.29 mATroubleshooting Test Equipment Required for Troubleshooting Overall TroubleshootingFlow Charts Type Purpose Recommended ModelSheet 1. Main Flowchart Sheet 2. Main Flowchart Sheet 3. Main Flowchart Sheet 4. OV at Turn-On Sheet 5. OV at Turn-On Sheet 6. FS Indicated but Fuse OK Sheet 7. No Output Voltage Sheet 8. No Output Voltage Sheet 9 No Output Voltage Sheet 10. No Current Limit Sheet 11. Unit Does Not OV Sheet 12. High Output Voltage Self-Test Error Codes/Messages Specific Troubleshooting ProceduresPower-on Self-test Failures Error Code Description Probable CauseBias and Reference Voltages CV/CC Status Annunciators TroubleshootingBias and Rail Voltages Bias Test Point Common MeasurementJ307 Voltage Measurements Voltage Measurements at J307 A2 Interface to A1 Main boardDisabling Protection Features Manual Fan Speed ControlPost-repair Calibration Inhibit Calibration SwitchCalibration Password Initialization ROM UpgradeUpgrade Procedure Identifying the FirmwareList of Required Tools Disassembly ProceduresRemote sense leads before attempting disassembly Front Panel Assembly, Removal and Replacement Cover, Removal and ReplacementA2 Interface Board, Removal and Replacement T1 Power Transformer, Removal and Replacement S1 Line Switch, Removal and ReplacementA3 Front Panel Board, Removal and Replacement A1 Main Control BoardLine Voltage Wiring Transformer WiringConnector Signal Description Interface SignalsPower Supply Interface signals Primary Interface A3 Front Panel CircuitsA2 Interface Circuits Secondary InterfaceA2/A3 Block Diagram Power Circuits A1 Main Board CircuitsA1 Block Diagram Control Circuits Principles of Operation Page Chassis, Electrical Designator Model PartNumber Qty DescriptionChassis, Mechanical Designator Model Part Number Qty DescriptionMechanical Parts ldentification A1 Control Board PC Board Assembly Replaceable Parts Replaceable Parts Replaceable Parts Replaceable Parts Replaceable Parts Replaceable Parts Replaceable Parts Replaceable Parts Replaceable Parts Replaceable Parts Replaceable Parts Relay Option #760 Binding Post Option #020A5 AC input/RFI Board General Schematic Notes Model-dependent ComponentsDiagrams A1 Board Component Locations R434 825 R500 175 325 R435 R505 A1 Board Component Locations A4 and A6 Board Component Locations A1 Board schematic sheet A1 Board schematic sheet A1 Board schematic sheet A6 Relay Option Board schematic Index Index Manual Updates
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Manual 82 pages 25.5 Kb Manual 103 pages 34 Kb

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