6
Secondary Interface Troubleshooting ................................................................................................................................. 41
Voltage and Current DAC............................................................................................................................................... 41
Readback DAC Circuits.................................................................................................................................................. 43
Readback Multiplexer (U20): ......................................................................................................................................... 43
Signature Analysis .............................................................................................................................................................. 45
Primary SA ..................................................................................................................................................................... 45
Front Panel SA................................................................................................................................................................ 45
Secondary SA ................................................................................................................................................................. 46
Power Section Troubleshooting.......................................................................................................................................... 51
Main Troubleshooting Setup........................................................................................................................................... 52
Troubleshooting No-Output Failures .............................................................................................................................. 53
Power Section Blocks ..................................................................................................................................................... 54
Troubleshooting AC-Turn-On Circuits........................................................................................................................... 57
Troubleshooting DC-To-DC Converter .......................................................................................................................... 57
Troubleshooting Bias Supplies ....................................................................................................................................... 58
Troubleshooting Down Programmer............................................................................................................................... 61
Troubleshooting CV Circuit ........................................................................................................................................... 61
Troubleshooting CC Circuit............................................................................................................................................ 62
Troubleshooting OVP Circuit......................................................................................................................................... 62
Troubleshooting PWM & Clock..................................................................................................................................... 63
Principles of Operation ........................................................................................................................................................ 65
Introduction......................................................................................................................................................................... 65
GPIB Board ........................................................................................................................................................................ 65
Primary Microprocessor ................................................................................................................................................. 65
Address Switches........................................................................................................................................................... 65
EEPROM ........................................................................................................................................................................ 67
Isolation .......................................................................................................................................................................... 67
Secondary Microprocessor ............................................................................................................................................. 67
Digital-to-Analog Converters.......................................................................................................................................... 67
Analog Multiplexer......................................................................................................................................................... 67
Status Inputs.................................................................................................................................................................... 67
Front Panel Board............................................................................................................................................................... 68
Address Latches and Decoders ....................................................................................................................................... 68
Volts and Amps Output Ports and Displays.................................................................................................................... 68
RPG and Latches ............................................................................................................................................................ 68
Front-Panel Switches and Input Port............................................................................................................................... 68
Mode Indicators.............................................................................................................................................................. 70
OVP Adjust Control........................................................................................................................................................ 70
Power Clear .................................................................................................................................................................... 70
Power Mesh and Control Board.......................................................................................................................................... 70
Overview......................................................................................................................................................................... 70
Power Mesh .................................................................................................................................................................... 71
Control Board ................................................................................................................................................................. 73
Replaceable Parts.................................................................................................................................................................. 79
Introduction......................................................................................................................................................................... 79
Ordering Information.......................................................................................................................................................... 80
Component Location and Circuit Diagrams .................................................................................................................... 101
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