Agilent Technologies 6622A Service Manual page 7

Figure
2-1 Agilent 6621A-6624 and 6627A Multiple Output Power Supplies, Block Diagram ......................................................2-2
2-2 Output Operating Ranges for Agilent Models 6621A-6624A and 6627A ...................................................................2-3
2-3 GPIB Board, Block Diagram .........................................................................................................................2-6
2-4 Outpot Board, Secondary Interface Circuits, Block Diagram...................................................................................2-9
2-5 Outpot Board, Power Mesh and Control Circuits, Block ......................................................................................2-12
2-6 Voltage and Current Control Circuits, Simplified Schematic ..............................................................................2-13
2-7 Typical Output Range Characteristics .............................................................................................................2-15
2-8 Typical Downprogramming Characteristics Below 2.0 V ....................................................................................2-16
2-9 Overvoltage Protection Circuits, Block Diagram ................................................................................................2-18
3-1 Operating Ranges Available in Models 6621A-6624A and 6627A ............................................................................3-3
3-2 Current Monitoring Resistor Setup ...................................................................................................................3-4
3-3 Basic Test Setup............................................................................................................................................3-5
3-4 Down Programming Speed Test Setup ..............................................................................................................3-7
3-5 CV Down Programming Speed Test Waveforms .................................................................................................3-7
3-6 CV UP Programming Speed Test Setup .............................................................................................................3-7
3-7 CV Up Programming Speed Test Waveforms......................................................................................................3-8
3-8 Transient Recovery Time Test Setup .................................................................................................................3-9
3-9 Transient Response Waveform ........................................................................................................................3-9
3-10 Fixed OV Protection Tea Setup ........................................................................................................................3-9
3-11 OV External Trip Test Connections..................................................................................................................3-10
3-12 Negative Current Limit (-CC) Readback Accuracy .............................................................................................3-12
4-1 Agilent 6621A-6624A and 6627A Multiple Output Supplies, Assembly Locations ......................................................4-3
4-2 GPIB Board, Fuse and Test Point Locations .......................................................................................................4-7
4-3 40WLV Output Board, Fuse and Test Point Locations ........................................................................................4-8
4-4 40WHV Output Board, Fuse end Test Point Locations.........................................................................................4-10
4-5 80WLV/80WHV Output Boards, Fuse and Test Point Locations .........................................................................4-11
4-6 Initial Troubleshooting and Board Isolation......................................................................................................4-15
4-7 GPIB Board and Front Panel Troubleshooting ..................................................................................................4-17
4-8 Signature Analysis Test Setup ........................................................................................................................4-19
4-9 Output Board Troubleshooting ......................................................................................................................4-31
4-10 Low Voltage Output Board Waveforms During Self Exercise Routine.....................................................................4-37
4-11 High Voltage Output Board Waveforms During Self Exercise Routine....................................................................4-39
4-12 DAC Amplifier Circuit Troubleshooting ..........................................................................................................4-41
4-13 Overvoltage Troubleshooting ........................................................................................................................4-42
4-14 Output Held Low Troubleshooting..................................................................................................................4-44
4-15 Output Held High Troubleshooting ................................................................................................................4-47
4-16 OV Circuit Will Not Trip Troubleshooting ........................................................................................................4-48
4-17 Signal Processor U327, Overvoltage Circuit, Schematic Simplified .........................................................................4-53
4-18 Signal Processor U327, Power-On/Start-Up Circuit, Schematic Simplified ...............................................................4-53
4-19 Signal Processor U327, Status Monitor Circuit, Simplified Schematic .....................................................................4-57
4-20 Status Problems Troubleshooting ...................................................................................................................4-58
6-1 Power Distribution Schematic .........................................................................................................................6-5
6-2 GPIB Board, Component Location .....................................................................................................................6-7
6-2 GPIB Board, Schematic Diagram .......................................................................................................................6-8
6-3 Output 1 & 2 Board, Component Location ..........................................................................................................6-9
6-3 Output 1 & 2 Board, Schematic Diagram .........................................................................................................6-10
6-4 Output 3 & 4 Board, Component Location ........................................................................................................6-15
6-4 Output 3 & 4 Board, Schematic Diagram ........................................................................................................6-16
6-5 Output 1 & 2 80W Board, Component Location .................................................................................................6-25
6-5 Output 1 & 2 80W Board, Schematic Diagram ....................................................................................................6-26
LIST OF FIGURES
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