Agilent Technologies 6010a, 6011A Troubleshooting No-Output Failures, Front Panel Troubleshooting

Page 36

d.Place the front panel power-on switch in the off position. Remove the ac input cover from the rear panel and connect the "L" and "N" screws on the barrier block to the output of the external DC supply. If a line cord is already connected to these terminals, construct an adapter as shown in Figure 3-2 (a), which allows you to connect the cord to the DC supply. In either case ignore polarity as the unit's rectifying diodes steer the dc power to the correct nodes.

e.Complete the setup of Figure 3-1 by attaching an ac mains cord to test points J8 (L, black wire) and J7 (N, white wire) and connect the green ground wire to the unit's case ground terminal or a suitably grounded cabinet screw. See Figure 3-2 (b). Plus the mains cord into an isolation transformer.

Troubleshooting No-Output Failures

Note

The main troubleshooting setup is not used for the No Output Failures and Front Panel troubleshooting

 

tests.

No-output failures often include failure of the A4Q1 through A4Q4 PFETs and their fuses, A4F1 and A4F2. When either the off-pulses or the power-limit comparator fails, the PFETs can fail from excessive power dissipation. The strategy for localizing no-output failures is to check the voltages and waveforms at the control board test connector to predict if that circuit failure would cause the PFETs to fail. This makes it possible to develop your troubleshooting approach without an extensive equipment setup. Proceed as follows:

a.With the mains cord unplugged remove the A4 FET Driver board as described on page 30. Plug in the mains cord and switch on power.

b.Using Table 3-1 check the bias voltages, the PWM-OFF, PWM-ON and Ip MONITOR Control signals and other signals of interest at the A2 control board test fingers, A2J7.

c.Check for the presence of program voltages, VP and IP, at the rear panel.

d.Check for presence of the 320Vdc rail voltage between the rear facing end of AlR3 and the rear facing end of AlR1. If there is no rail voltage, check diode Assembly A1U1.

A1R1, A1R3, and AlU1 connect to the ac mains voltage. Use a voltmeter with both input terminals floating to measure the rail voltage.

e.Select the functional circuit for troubleshooting based on your measurements and Table 3-2, which provides direction based on the status of the PWM OFF and PWM ON signals .

Front Panel Troubleshooting

Troubleshoot the A3 front panel board by first doing the following setup:

a.Remove the top plastic insert from the front frame by prying up with a flat-blade screwdriver.

b.Remove the 4 front panel assembly mounting screws (Phillips 6-32), two on top and two on the bottom.

c.Detach the A3 board from the front panel assembly by removing the 6 mounting screws (Pozidriv, M4x7).

d.Place the A3 board vertically against the supply with a piece of insulating material between. The test connector can then be attached to the A3 board. The rest of the front panel assembly can stand vertically so that the pots and the switches can be accessed while troubleshooting.

e.Plug in the mains cord and switch on power.

The ac mains voltage connects directly to the LINE switch and to components and traces at the front of the A1 main board. Be extremely careful to avoid touching the ac mains voltage.

Start troubleshooting by performing the tests given in Table 3-3. This table provides the measurements for the test points on the test connector as well as the source components for that measurement. Table 3-4 gives front panel symptoms as well as the circuits or components that may cause the supply to exhibit those symptoms. Both Tables 3-3 and 3-4 should be used to check out and troubleshoot the front panel.

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Contents Autoranging DC Power Supply Agilent Models 6010A, 6011A Certification Safety Summary Safety Symbol Definitions Table of Contents Replaceable Parts Troubleshooting Circuit DiagramsSafety Considerations ScopeManual Revisions Item DescriptionCalibration Procedure IntroductionTest Equipment Required Operation Verification TestsType Required Characteristics USE Recommended Model Test Equipment Required4KVA Initial Setup Calibration ProcedureMON Display Settings VoutIout Common Mode Setup Performance Tests Measurement TechniquesCR4 Current-Monitoring Resistor Setup Basic Test Setup Constant Voltage CV TestsPage RMS Measurement Test Setup, CV Pard Test Peak-To-Peak Measurement Test Setup, CV Pard Test 6010A 6011A Not Applicable6012B 6015A Load Transient Recovery Waveform 6010A 6011A 6012B 6015AConstant Current CC Tests Page CC Pard Test Setup Troubleshooting Initial Troubleshooting ProceduresControl Board Test Connector, A2J7 VdcRepair and Replacement Electrostatic ProtectionA2 Control Board Removal A4 FET Board RemovalA5 Diode Board Removal A3 Front Panel Board RemovalA1 Main Board Removal Overall Troubleshooting Procedure A1 Designator Wire color A3S1 Position Rear ViewA3 Front Panel Assembly Rear View Using the Tables Main Troubleshooting SetupMain Troubleshooting Setup Modified Mains Cord Set For Troubleshooting Troubleshooting No-Output Failures Front Panel TroubleshootingA2J7-26 A2J7-25 Troubleshooting Bias Supplies A3 Front Panel Board Failure SymptomsPerformance Failure Symptoms Node + Node + N0DEPower Section Blocks Troubleshooting AC-Turn-on CircuitsTroubleshooting PWM & Clock AC FaultRelay Enable + OUTTroubleshooting DC-To-DC Converter Troubleshooting Down ProgrammerPWM-ON PWM-OFFWaveforms Troubleshooting CV Circuit Troubleshooting CC CircuitON/OFF OFFTroubleshooting OVP Circuit SET Voltage Setup MeasurementPage Autoranging Power OverviewSystem Description Regulation & Control Subsystem A and 6015A Simplified Schematic A and 6012B Simplified Schematic Quick Reference Guide to Major Circuits Major Function OperationInput from Output to PWM DP DP PWMInput Power Subsystem Protection SubsystemDC Power Conversion Subsystem Output SubsystemFront Panel Board Page Simplified Front Panel Schematic Replaceable Parts Reference DesignatorsOrdering Information Description AbbreviationsMain Board Assembly CB1 CR1CR2 CR5VR1 A1 Mechanical6010A C37 6010A, 6011A, 6015A Not Used Not Used Not Used Page Not Used VR2 VR5VR6 TB1 TB2Not Used VR1 VR2 Agilent ModelTS1 Drvr TTL NOR DualCR3 CR6FET N-CHAN A5 Mechanical A6 Mechanical Chassis Electrical Not Used Component Location and Circuit Diagrams Schematic Diagram NotesIndicate number of paths represented by the line Top View, Top Covers Removed Main Board A1 and Filter Board A6 Component Location Control Board A2 Component Location Front Panel Board A3 Component Location FET Board A4 Component Location Diode Board A5 Component Location Page Page Page Page Specifications General InformationOption 002 Hardware Table A-1. Specifications, Option Remote Programming Input Compliance Voltage ± Current Programming EnableStatus Indicators AccuracyRemote Trip and Remote Reset Timing Power-on PresetMaximum Output Voltage logic high + On State logic lowTable A-1. Specifications, Option Pulse Timing Bias Supplies DC Output Ratings 25C ±Short Circuit Output Current Pard TypicalInstallation Connector Assembly ProcedureFigure A-1. Mating Connector Assembly OperationLocal/Remote Programming Resistance Voltage or Current Remote Resistance Programming Figure A-4. Calculating Value of Series Dropping ResistorFigure A-5. Remote Resistance Programming Remote Monitoring 101Status Indicators Remote Control102 Remote Reset Overvoltage103 Power-On Preset 104AC Dropout Buffer Circuit Multiple Supply System Shutdown105 Maintenance Bias Supplies106 Troubleshooting Resistance and Voltage Programming Troubleshooting Current Programming107 Figure A-11. Troubleshooting Current Programming of CV Mode 108Figure A-13. Troubleshooting Status Indicators 109110 Table A-3. Replacement Parts 111112 VR9 113Logic Symbols and Definitions Indicator and Qualifier Symbols114 Schematic Diagram Notes 115Schematic Notes Figure A-15. Option 002 Board, Component Location 116Figure A-16. Option 002 Board, Schematic Diagram 117 Page Model 6010A Change Model 6011A Change119 Model 6012B Change Model 6015A Change120 Delete 121122 123 124 DS5 125126
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6015A, 6012B, 6011A, 6010a specifications

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