100 | Agilent Technologies AGILENT MODELS 6023A and 6028A manual

Table A-3. Replacement Parts

REF. DESIG.	MODEL NO.	PART NO.	DESCRIPTION
R22	All	0686-1525	fxd. film 1.5K 5% 1/4W
R23	All	0683-1535	fxd. film 15K 5% 1/4W
R24	All	0683-4715	fxd. film 470 5% 1/4W
R25,26	All	0683-1235	fxd. film 12K 5% 1/4W
R27	All	0686-1525	fxd. film 1.5K 5% 1/4W
R28	All	0683-1535	fxd. film 15K 5% 1/4W
R29,30	All	0698-4479	fxd. film 14K 1% 1/8W
R31	All	0686-5125	fxd. comp. 5.lK 5% 1/2W
R32	All	0683-5125	fxd. film 5.1K 5% 1/4W
R33	All	0686-5125	fxd. comp. 5.1K 5% 1/4W
R34	All	0683-5125	fxd. film 5.1K 5% 1/4W
R35	All	0757-0986	fxd. film 12.1K 1% 1/2W
R36	All	0757-0269	fxd. film 270 1% 1/8W
R37	All	0683-4715	fxd. film 470 5% 1/4W
R38	All	0683-1035	fxd. film 10K 5% 1/4W
R39	All	0698-6631	fxd. film 2.5K .1% 1/8W
R40	All	0683-4715	fxd. film 470 5% 1/4W
R41	All	0813-0001	fxd. ww. 1K 5% 3W
R42	All	0683-4715	fxd. film 470 5% 1/4W
R43	All	0683-l035	fxd. film 10K 5% 1/4W
R44	All	0698-6631	fxd. film 2.5K .1% 1/8W
R45	All	0683-4715	fxd. film 470 5% 1/4W
R46	All	0813-0001	fxd. ww. 1K 5% 3W
R47	All	0683-1525	fxd. film 1.5K 5% 1/4W
R48	All	0683-3325	fxd. film 3.3K 5% 1/4W
R49	All	0683-2225	fxd. film 2.2K 5% 1/4W
R50,51	All	0683-3355	fxd. film 3.3M 5% 1/4W
R52,53	All	0683-1055	fxd. film 1M 5% 1/4W
R54	All	0757-0441	fxd. film 8.25K 1% 1/8W
R55	All	0757-0986	fxd. film 12.lK 1% 1/2W
R56	All	0757-0269	fxd. film 270 1% 1/8W
R57	All	0698-3226	fxd film 6.49K 1% 1/8W
S1	All	3101-2715	Switch-Slide 2-lA .1A 50V
U1-3	All	1990-0732	Opto-Isolator IF=20mA max.
U4	All	1820-1197	IC NAND gate TTL LS quad
U5	All	1820-1202	IC NAND gate TTL LS
U6	6023A	1826-0393	IC Voltage Reg.
U6	6028A	5060-2942	IC Voltage Reg. heatsink assy.
U7	6023A	1826-0551	IC Voltage Reg.
U7	6028A	5060-2945	IC Voltage Reg. heat sink assy.
U8-10	All	1990-0494	Opto-Isolator IF=20mA max.
U11	All	1820-1491	IC Buffer TTL LS, hex
U12	All	1820-1416	IC Schmitt-Trig. TTL LS, hex
U13	All	1820-l437	IC Multi. Vib. TTL LS
U14	All	1858-0023	Trans. Array 16-pin
U15	6023A	1826-0527	IC Voltage Reg.
U15	6028A	5060-2943	IC Voltage Reg. heatsink assy.
U16	6023A	1826-0277	IC Voltage Reg.
U16	6028A	5060-2950	IC Voltage Reg. heatsink assy.
U17,18	All	1826-0493	IC Op Amp Low-bias-High-Impd.

100

Image 100

Agilent Technologies AGILENT MODELS 6023A and 6028A service manual 100

Contents

Autoranging Certification Safety Summary Safety Symbol Definitions Printing History Table of Contents Replaceable Parts Troubleshooting Circuit DiagramsSafety Considerations Scope Manual Revisions Item Description Calibration Procedure IntroductionTest Equipment Required Operation Verification Tests Type Required Characteristics USE Recommended Model Test Equipment Required Initial Setup 1KVA Calibration Procedure MON Vout Iout Measurement Techniques Performance TestsCR7 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 Control Board Test Connector, A2J7 PIN no Signal NameVdc WAVEFORM/CONDITIONS Source Repair and Replacement Electrostatic Protection A2 Control Board Removal A4 Power Mesh Board Removal Overall Troubleshooting ProcedureA3 Front-Panel Board Removal A1 Main Board Removal Using the Tables SetupNode Measurement Main Troubleshooting Setup Main Troubleshooting Setup Modified Mains Cord Set For Troubleshooting Troubleshooting No-Output Failures Front-Panel Troubleshooting A2J7-26 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 Source Measurement Source Node +Node + N0DE Power Section Blocks Troubleshooting AC-Turn-on CircuitsSetup Measurement Source Setup Measurement Relay Enable Troubleshooting PWM & ClockPower Limit Troubleshooting DC-To-DC Converter + OUTPWM-ON PWM-OFF Troubleshooting CV Circuit Troubleshooting CC Circuit Troubleshooting OVP Circuit Troubleshooting Down ProgrammerA4U4OUT 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 Power-Limit Comparator Constant-Current CC CircuitOvervoltage Protection OVP Circuit Control-Voltage Comparator Initial-Ramp Circuit Pulse-Width Modulator PWMBias Voltage Detector AC-Surge Dropout Detector Second-Delay Circuit Display CircuitsPage Replaceable Parts Reference Designators Ordering Information Description Abbreviations Electrical Parts CR1CR2 CR3 XA2P2 XA2P1Mechanical Parts Control Board Assembly CR3 Page Page Page VR4 VR3VR5 DS1 CR5DS5 VR1 IC A/D Cmos 3-1/2 DGTVR2 NPN SI Pfet TS1 Chassis Electrical A1TB1 A2 Board Mechanical PartsA3 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 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 Indicators Remote Trip and Remote Reset Timing Power-on PresetMaximum Output Voltage logic high + On State logic low Table A-1. Specifications, Option Pulse Timing Bias Supplies DC Output Ratings 25C ±Short Circuit Output Current 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 Indicator and Qualifier Symbols OLD Symbol NEW SymbolLogic Symbols and Definitions 102 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 6028A Model 6023A107 From 108