Agilent Technologies
AGILENT MODELS 6023A and 6028A
service manual
Troubleshooting
Specification
Install
Block Diagram Overview
PIN no Signal Name
Second-Delay Circuit
Safety Symbol Definitions
Status Indicators
Maintenance
Power-on Preset
Page 78
Page 77
Page 79
Image 78
Page 77
Page 79
Contents
Autoranging
Certification
Safety Summary
Safety Symbol Definitions
Printing History
Table of Contents
Replaceable Parts
Safety Considerations
Troubleshooting
Circuit Diagrams
Scope
Manual Revisions
Item Description
Test Equipment Required
Calibration Procedure
Introduction
Operation Verification Tests
Type Required Characteristics USE Recommended Model
Test Equipment Required
Initial Setup
1KVA
Calibration Procedure
MON
Vout
Iout
Performance Tests
Measurement Techniques
CR7
Current-Monitoring Resistor Setup
Constant Voltage CV Tests
Basic 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 Pard
Load Transient Recovery Waveform
Constant Current CC Tests
CC Pard Test Setup
Troubleshooting
Initial Troubleshooting Procedures
Vdc
Control Board Test Connector, A2J7
PIN no Signal Name
WAVEFORM/CONDITIONS Source
Repair and Replacement
Electrostatic Protection
A2 Control Board Removal
A3 Front-Panel Board Removal
A4 Power Mesh Board Removal
Overall Troubleshooting Procedure
A1 Main Board Removal
Node
Using the Tables
Setup
Measurement
Main Troubleshooting Setup
Main Troubleshooting Setup
Modified Mains Cord Set For Troubleshooting
Troubleshooting No-Output Failures
Front-Panel Troubleshooting
PWM-ON PWM-OFF Defective Check Functional Circuits
A2J7-26 A2J7-25
Board
Symptoms Defective Check Functional Circuits Board
Troubleshooting Bias Supplies
Symptoms Defective Circuit Check Components
Node + Measurement Source
Node +
Measurement Source
Node + N0DE
Setup Measurement Source
Power Section Blocks
Troubleshooting AC-Turn-on Circuits
Setup Measurement
Troubleshooting PWM & Clock
Relay Enable
Power Limit
PWM-ON
Troubleshooting DC-To-DC Converter
+ OUT
PWM-OFF
Troubleshooting CV Circuit
Troubleshooting CC Circuit
Troubleshooting Down Programmer
Troubleshooting OVP Circuit
A4U4OUT
Waveforms
SET Voltage Vdc Node +
Page
Autoranging Power
Block Diagram Overview
Block Diagram
Simplified Schematic
Simplified Schematic
DC-to-DC Converter
Down Programmer
Pfet Control Signals Timing Diagram
Constant-Voltage CV Circuit
Overvoltage Protection OVP Circuit
Power-Limit Comparator
Constant-Current CC Circuit
Control-Voltage Comparator
Bias Voltage Detector
Initial-Ramp Circuit
Pulse-Width Modulator PWM
AC-Surge Dropout Detector
Second-Delay Circuit
Display Circuits
Page
Replaceable Parts
Reference Designators
Ordering Information
Description Abbreviations
CR2
Electrical Parts
CR1
CR3
XA2P1
XA2P2
Mechanical Parts
Control Board Assembly
CR3
Page
Page
Page
VR3
VR4
VR5
CR5
DS1
DS5
IC A/D Cmos 3-1/2 DGT
VR1
VR2
NPN SI
Pfet
TS1
Chassis Electrical
A3 Board Mechanical Parts
A1TB1
A2 Board Mechanical Parts
A4 Board Mechanical Parts
Option 220 220V Operation
Option 240 240V 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
Specifications
General Information
Option 002 Hardware
Output Impedance 10.2 k ohm ± 5% Temperature Coefficient
Table A-1. Specifications, Option Remote Programming
Input Compliance Voltage ± Current Programming Enable
Status Indicators
Maximum Output Voltage logic high +
Remote Trip and Remote Reset Timing
Power-on Preset
On State logic low
Short Circuit Output Current
Table A-1. Specifications, Option Pulse Timing
Bias Supplies DC Output Ratings 25C ±
Pard Typical
Installation
Connector Assembly Procedure
Figure A-1. Mating Connector Assembly
Operation
Local/Remote Programming
Resistance Voltage or Current
Remote Resistance Programming
Figure A-4. Calculating Value of Series Dropping Resistor
Figure A-5. Remote Resistance Programming
Remote Monitoring
Status Indicators
Remote Control
Remote Reset
Overvoltage
Power-On Preset
Figure A-8. Remote Control
AC Dropout Buffer Circuit
Multiple Supply System Shutdown
Maintenance
Bias Supplies
Troubleshooting Resistance and Voltage Programming
Troubleshooting Current Programming
Figure A-11. Troubleshooting Current Programming of CV Mode
Figure A-13. Troubleshooting Status Indicators
Page
Table A-3. Replacement Parts
REF. Desig Model no Description
100
VR9
101
Logic Symbols and Definitions 102
Indicator and Qualifier Symbols
OLD Symbol NEW Symbol
Definitions
Schematic Notes
Schematic Diagram Notes 103
Schematic Notes
Figure A-15. Option 002 Board, Component Location 104
Figure A-16. Option 002 Board, Schematic Diagram 105
Page
Model 6023A
Model 6028A
107
From
108
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