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

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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.

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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