Agilent Technologies AGILENT MODELS 6023A and 6028A instruction

SERVICE MANUAL

AUTORANGING

DC POWER SUPPLY AGILENT MODELS 6023A and 6028A

Agilent Part No. 5964-8283

FOR INSTRUMENTS WITH SERIAL NUMBERS

Agilent Model 6023A; Serials	US36490101 and above
Agilent Model 6028A; Serials	US36520101 and above

For instruments with higher serial numbers, a change page may be included.

Microfiche Part No. 5964-8284

Printed in USA: July 2001

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Agilent Technologies AGILENT MODELS 6023A and 6028A service manual Autoranging

Contents

Autoranging Certification Safety Summary Printing History Safety Symbol Definitions Table of Contents Replaceable Parts Circuit Diagrams TroubleshootingSafety Considerations Scope Item Description Manual Revisions Introduction Calibration ProcedureTest Equipment Required Operation Verification Tests Test Equipment Required Type Required Characteristics USE Recommended Model 1KVA Initial Setup MON Calibration Procedure Iout Vout Measurement Techniques Performance TestsCR7 Constant Voltage CV Tests Current-Monitoring Resistor Setup Basic Test Setup RMS Measurement Test Setup, CV Pard Test Peak-To-Peak Measurement Test Setup, CV Pard Test KHz Noise, CV Peak-to-Peak Pard 6023A 6028A Load Transient Recovery Waveform Constant Current CC Tests CC Pard Test Setup Initial Troubleshooting Procedures Troubleshooting PIN no Signal Name Control Board Test Connector, A2J7Vdc WAVEFORM/CONDITIONS Source Electrostatic Protection Repair and Replacement A2 Control Board Removal Overall Troubleshooting Procedure A4 Power Mesh Board RemovalA3 Front-Panel Board Removal A1 Main Board Removal Setup Using the TablesNode Measurement Main Troubleshooting Setup Main Troubleshooting Setup Modified Mains Cord Set For Troubleshooting Front-Panel Troubleshooting Troubleshooting No-Output Failures A2J7-26 A2J7-25 PWM-ON PWM-OFF Defective Check Functional CircuitsBoard Symptoms Defective Circuit Check Components Troubleshooting Bias SuppliesSymptoms Defective Check Functional Circuits Board Node + Measurement Source Measurement Source Node +Node + N0DE Troubleshooting AC-Turn-on Circuits Power Section BlocksSetup Measurement Source Setup Measurement Relay Enable Troubleshooting PWM & ClockPower Limit + OUT Troubleshooting DC-To-DC ConverterPWM-ON PWM-OFF Troubleshooting CC Circuit Troubleshooting CV Circuit Troubleshooting OVP Circuit Troubleshooting Down ProgrammerA4U4OUT Waveforms SET Voltage Vdc Node + Page Block Diagram Overview Autoranging Power Block Diagram Simplified Schematic Simplified Schematic Down Programmer DC-to-DC Converter Constant-Voltage CV Circuit Pfet Control Signals Timing Diagram Constant-Current CC Circuit Power-Limit ComparatorOvervoltage Protection OVP Circuit Control-Voltage Comparator Pulse-Width Modulator PWM Initial-Ramp CircuitBias Voltage Detector AC-Surge Dropout Detector Display Circuits Second-Delay CircuitPage Reference Designators Replaceable Parts Description Abbreviations Ordering Information CR1 Electrical PartsCR2 CR3 XA2P2 XA2P1Mechanical Parts Control Board Assembly CR3 Page Page Page VR4 VR3VR5 DS1 CR5DS5 VR1 IC A/D Cmos 3-1/2 DGTVR2 Pfet NPN SI Chassis Electrical TS1 A2 Board Mechanical Parts A1TB1A3 Board Mechanical Parts A4 Board Mechanical Parts Option 240 240V Operation Option 220 220V Operation Component 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 Input Compliance Voltage ± Current Programming Enable Table A-1. Specifications, Option Remote ProgrammingOutput Impedance 10.2 k ohm ± 5% Temperature Coefficient Status Indicators Power-on Preset Remote Trip and Remote Reset TimingMaximum Output Voltage logic high + On State logic low Bias Supplies DC Output Ratings 25C ± Table A-1. Specifications, Option Pulse TimingShort Circuit Output Current Pard Typical Connector Assembly Procedure Installation Operation Figure A-1. Mating Connector Assembly Local/Remote Programming Resistance Voltage or Current Figure A-4. Calculating Value of Series Dropping Resistor Remote Resistance Programming Figure A-5. Remote Resistance Programming Remote Monitoring Remote Control Status Indicators Overvoltage Remote Reset Figure A-8. Remote Control Power-On Preset Multiple Supply System Shutdown AC Dropout Buffer Circuit Bias Supplies Maintenance Troubleshooting Current Programming Troubleshooting Resistance and Voltage Programming Figure A-11. Troubleshooting Current Programming of CV Mode Figure A-13. Troubleshooting Status Indicators Page REF. Desig Model no Description Table A-3. Replacement Parts 100 101 VR9 OLD Symbol NEW Symbol Indicator and Qualifier SymbolsLogic Symbols and Definitions 102 Definitions Schematic Diagram Notes 103 Schematic Notes Figure A-15. Option 002 Board, Component Location 104 Schematic Notes Figure A-16. Option 002 Board, Schematic Diagram 105 Page Model 6028A Model 6023A107 108 From