Agilent Technologies AGILENT MODELS 6023A and 6028A service manual IC A/D Cmos 3-1/2 DGT, VR1, VR2

Page 64

Table 5-5. A3 Front-Panel Board Parts List

Ref. Desig.

Agilent Model

Agilent Part Number

Description

R68

All

0698-6362

Resistor, fixed film 1KΩ 0.1% 1/8W

R69

All

0698-6343

Resistor, fixed film 9KΩ 0.1% 1/8W

R71

6023A

0698-6363

Resistor, fixed film 40KΩ 0.1% 1/8W

R71

6028A

0698-8861

Resistor, fixed film 6.66KΩ 0.1% 1/8W

R72

6023A

0698-7353

Resistor, fixed film 19KΩ 1% 1/8W

R72

6028A

0698-4493

Resistor, fixed film 34KΩ 1% 1/8W

R73

6023A

0757-0280

Resistor, fixed film 1KΩ 1% 1/8W

R73

6028A

0698-3476

Resistor, fixed film 6.00KΩ 1% 1/8W

R74

All

0683-1025

Resistor, fixed film 1KΩ 5% 1/4W

R75

All

0683-3025

Resistor, fixed composition 3KΩ 5% 1/4W

R77

All

0757-0458

Resistor, fixed film 51.1KΩ 1% 1/8W

R78

All

0698-3159

Resistor, fixed film 26.1KΩ 1% 1/8W

R79

All

0757-0441

Resistor, fixed film 8.25KΩ 1% 1/8W

R80

All

0757-0438

Resistor, fixed film 5.11KΩ +1% 1/8W

R81

All

0683-5135

Resistor, fixed composition 51KΩ ± % 1/4W

R82

All

0683-1025

Resistor, fixed composition 1KΩ 5% 1/4W

R83

All

0683-5125

Resistor, fixed composition 5.1KΩ ~5% 1/4W

R84

All

0683-1025

Resistor, fixed composition 1KΩ 5% 1/4W

R85

All

0757-0280

Resistor, fixed film 1KΩ 1% 1/8W

R86

All

0698-5808

Resistor, fixed film 4KΩ 1% 1/8W

R87

6023A

0698-3201

Resistor, fixed film 80KΩ 1% 1/8W

R87

6028A

0757-0449

Resistor, fixed film 20KΩ 1% 1/8W

R88

6023A

0757-0449

Resistor, fixed film 20KΩ 1% 1/8W

R88

6028A

0757-0453

Resistor, fixed film 30.1KΩ 1% 1/8W

R89

All

0683-5135

Resistor, fixed composition 51KΩ 5% 1/4W

R90

All

0757-0199

Resistor, fixed film 21.5KΩ + 1% 1/4W

R91

All

0683-5235

Resistor, fixed composition 51KΩ 5% 1/4W

R92,93

All

0757-0452

Resistor, fixed film 27.4KΩ 1% 1/8W

S1,2

All

5060-9436

Switch lighted pusbutton

U1

All

1826-0502

IC switch analog quad

U2

All

1826-0493

IC op amp lo-bias hi-impedance

U3

All

1826-0346

IC op amp dual general purpose

U4,5

All

1826-0876

IC A/D CMOS 3-1/2 DGT

U6

All

1820-1144

IC gate TTL LS NOR quad

U7

All

1826-0502

IC switch analog quad

U9

All

1826-0138

IC comparator GP quad

VR1

All

1902-3092

Diode zener 4.99V 2%

VR2

All

1902-0064

Diode zener 7.5V 5%

W4

All

7175-0057

Wire 22 AWG

W7

6028A

7175-0057

Wire 22 AWG

W8

6023A

7175-0057

Wire 22 AWG

W11

All

7175-0057

Wire 22 AWG

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Contents Autoranging Certification Safety Summary Safety Symbol Definitions Printing HistoryTable 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 RequiredInitial Setup 1KVACalibration Procedure MONVout IoutMeasurement Techniques Performance TestsCR7 Current-Monitoring Resistor Setup Constant Voltage CV TestsBasic Test Setup RMS Measurement Test Setup, CV Pard Test Peak-To-Peak Measurement Test Setup, CV Pard Test 6023A 6028A KHz Noise, CV Peak-to-Peak PardLoad Transient Recovery Waveform Constant Current CC Tests CC Pard Test Setup Troubleshooting Initial Troubleshooting ProceduresControl Board Test Connector, A2J7 PIN no Signal NameVdc WAVEFORM/CONDITIONS SourceRepair and Replacement Electrostatic ProtectionA2 Control Board Removal A4 Power Mesh Board Removal Overall Troubleshooting ProcedureA3 Front-Panel Board Removal A1 Main Board RemovalUsing the Tables SetupNode MeasurementMain Troubleshooting Setup Main Troubleshooting SetupModified Mains Cord Set For Troubleshooting Troubleshooting No-Output Failures Front-Panel TroubleshootingA2J7-26 A2J7-25 PWM-ON PWM-OFF Defective Check Functional CircuitsBoard Troubleshooting Bias Supplies Symptoms Defective Circuit Check ComponentsSymptoms Defective Check Functional Circuits Board Node + Measurement SourceMeasurement Source Node +Node + N0DE Power Section Blocks Troubleshooting AC-Turn-on CircuitsSetup Measurement Source Setup MeasurementRelay Enable Troubleshooting PWM & ClockPower Limit Troubleshooting DC-To-DC Converter + OUTPWM-ON PWM-OFFTroubleshooting CV Circuit Troubleshooting CC CircuitTroubleshooting OVP Circuit Troubleshooting Down ProgrammerA4U4OUT Waveforms SET Voltage Vdc Node + Page Autoranging Power Block Diagram OverviewBlock Diagram Simplified Schematic Simplified Schematic DC-to-DC Converter Down ProgrammerPfet Control Signals Timing Diagram Constant-Voltage CV CircuitPower-Limit Comparator Constant-Current CC CircuitOvervoltage Protection OVP Circuit Control-Voltage ComparatorInitial-Ramp Circuit Pulse-Width Modulator PWMBias Voltage Detector AC-Surge Dropout DetectorSecond-Delay Circuit Display CircuitsPage Replaceable Parts Reference DesignatorsOrdering Information Description AbbreviationsElectrical Parts CR1CR2 CR3XA2P2 XA2P1Mechanical Parts Control Board Assembly CR3 Page Page Page VR4 VR3VR5 DS1 CR5DS5 VR1 IC A/D Cmos 3-1/2 DGTVR2 NPN SI PfetTS1 Chassis ElectricalA1TB1 A2 Board Mechanical PartsA3 Board Mechanical Parts A4 Board Mechanical PartsOption 220 220V Operation Option 240 240V OperationComponent Location and Circuit Diagrams Schematic Diagram Notes Pin locations for other semi-conductors are shown below Top View, Top Covers Removed Main Board A1 Component Location Control Board A2 Component Location Front-Panel Board A3 Component Location Power Mesh Board A4 Component Location Page Page General Information SpecificationsOption 002 Hardware Table A-1. Specifications, Option Remote Programming Input Compliance Voltage ± Current Programming EnableOutput Impedance 10.2 k ohm ± 5% Temperature Coefficient Status IndicatorsRemote 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 Status Indicators Remote ControlRemote Reset OvervoltagePower-On Preset Figure A-8. Remote ControlAC Dropout Buffer Circuit Multiple Supply System ShutdownMaintenance Bias SuppliesTroubleshooting Resistance and Voltage Programming Troubleshooting Current ProgrammingFigure A-11. Troubleshooting Current Programming of CV Mode Figure A-13. Troubleshooting Status Indicators Page Table A-3. Replacement Parts REF. Desig Model no Description100 VR9 101Indicator and Qualifier Symbols OLD Symbol NEW SymbolLogic Symbols and Definitions 102 DefinitionsSchematic Notes Schematic Diagram Notes 103Schematic Notes Figure A-15. Option 002 Board, Component Location 104Figure A-16. Option 002 Board, Schematic Diagram 105 Page Model 6028A Model 6023A107 From 108
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