Agilent Technologies AGILENT MODELS 6023A and 6028A service manual XA2P1, XA2P2, Mechanical Parts

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Table 5-3. A1 Main Board Parts List (continued)

Ref. Desig.	Agilent Model	Agilent Part Number	Description
R8	6028A	0699-0118	Resistor 20Ω 0.1% 0.1W
R9	6028A	7175-0057	Wire tinned copper AWG 22
R10	6028A	0698-6359	Resistor 80KΩ 0.1% 1/8W
R11	All	0698-6322	Resistor 4KΩ 0.1% 1/8W
R12	All	0698-8695	Resistor 36KΩ 0.1% 1/8W
R14	6023A	0698-3572	Resistor 60.4Ω 1% 1/8W
R15	6023A	8151-0013	Wire 22 AWG
R15	6028A	0757-0270	Resistor 249KΩ 1% 1/4W
R17,18	All	0683-1005	Resistor 10Ω 5% 1/4W
R19	All	0683-1055	Resistor 1MΩ 5% 1/4W
R20,21	All	0811-1867	Resistor 15KΩ 5% 5W
R22.23	All	0686-1065	Resistor 10MΩ 5% 1/2W
R24,25	All	0686-1035	Resistor 10KΩ 5% 1/2W
R26	All	0683-3315	Resistor 330Ω 5% 1/4W
R27A,28B	6028A	0811-3823	Resistor 0.1Ω 5% 20W
R29	6028A	0686-3335	Resistor 33KΩ 5% 1/2W
R30	6028A	0811-1865	Resistor 2KΩ 1% 5W
R31	6028A	0812-0098	Resistor 135Ω 5% 5W
R32	6028A	0683-1035	Resistor 10KΩ 5% 1/4W
R33	6028A	0683-4745	Resistor 470Ω 5% 1/4W
R34	6028A	0683-2035	Resistor 20KΩ 5% 1/4W
S1	6023A	3101-0402	Switch DPST rocker (mounted on front-
			panel)
S2	All	3101-1914	Switch 2-DPDT slide
S4	All	3101-2046	Switch DPDT slide
T1	6023A	5080-1978	Transformer, power
T1	6028A	06038-80090	Transformer, power
T2	All	9170-1264	Core magnetic (used with primary wire
			06023-80004)
T3	All	9100-4864	Transformer bias
T4	All	5080-1984	Choke line 2mH
TP1, 2	All	1251-5613	Connector single contact
U1	All	1906-0006	Rectifier bridge 400V 1A
VR1, 2	6028A	1902-1377	Diode zener 6.19V 2%
W1, 2	All	06023-80003	Jumper output 10 AWG
XA2P1	All	1251-8665	Connector, 30-contact
XA2P2	All	1251-8667	Connector, 20 contact
XA4P1, 2	All	1251-8806	Connector, DIN 32-contact
		MECHANICAL PARTS
	6028A	1480-0552	Pin, escutcheon (L1)
	6028A	0380-1489	Snap-in-spacer
	6028A	2110-0269	Fuseholder, clip type F2
	6028A	0360-2190	Jumper, locai sensing (2)
	6028A	0360-1833	Barrier block, 6-position
	6023A	0515-0964	screw
	6023A	2190-0586	washer, lock
	6023A	3050-0893	washer, flat

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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 IoutCR7 Performance TestsMeasurement Techniques 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 TroubleshootingBoard PWM-ON PWM-OFF Defective Check Functional CircuitsA2J7-26 A2J7-25 Troubleshooting Bias Supplies Symptoms Defective Circuit Check ComponentsSymptoms Defective Check Functional Circuits Board Node + Measurement SourceNode + N0DE Node +Measurement Source Power Section Blocks Troubleshooting AC-Turn-on CircuitsSetup Measurement Source Setup MeasurementPower Limit Troubleshooting PWM & ClockRelay Enable Troubleshooting DC-To-DC Converter + OUTPWM-ON PWM-OFFTroubleshooting CV Circuit Troubleshooting CC CircuitA4U4OUT Troubleshooting Down ProgrammerTroubleshooting OVP Circuit 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 CR3Mechanical Parts XA2P1XA2P2 Control Board Assembly CR3 Page Page Page VR5 VR3VR4 DS5 CR5DS1 VR2 IC A/D Cmos 3-1/2 DGTVR1 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 Option 002 Hardware SpecificationsGeneral Information 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 107 Model 6023AModel 6028A From 108