5
TABLE OF CONTENTS
Introduction............................................................................................................................................................................ 7
Scope.................................................................................................................................................................................... 7
Calibration and Verification............................................................................................................................................. 7
Troubleshooting................................................................................................................................................................7
Principles of Operation.....................................................................................................................................................7
Replaceable Parts..............................................................................................................................................................7
Circuit Diagrams...............................................................................................................................................................7
Safety Considerations........................................................................................................................................................... 7
Manual Revisions................................................................................................................................................................. 8
Calibration and Verification..................................................................................................................................................9
Introduction...........................................................................................................................................................................9
Test Equipment Required..................................................................................................................................................... 9
Operation Verification Tests.................................................................................................................................................9
Calibration Procedure...........................................................................................................................................................9
Initial Setup.....................................................................................................................................................................11
Performance Tests.............................................................................................................................................................. 14
Measurement Techniques............................................................................................................................................... 14
Constant Voltage (CV) Tests..........................................................................................................................................15
Constant Current (CC) Tests...........................................................................................................................................21
Troubleshooting....................................................................................................................................................................23
Introduction.........................................................................................................................................................................23
Initial Troubleshooting Procedures.....................................................................................................................................23
Electrostatic Protection.......................................................................................................................................................25
Repair and Replacement.....................................................................................................................................................25
A2 Control Board Removal............................................................................................................................................26
A4 Power Mesh Board Removal.................................................................................................................................... 27
A3 Front-Panel Board Removal......................................................................................................................................27
A1 Main Board Removal................................................................................................................................................27
Overall Troubleshooting Procedure....................................................................................................................................27
Using the Tables............................................................................................................................................................. 28
Main Troubleshooting Setup.......................................................................................................................................... 29
Troubleshooting No-Output Failures..............................................................................................................................31
Front-Panel Troubleshooting..........................................................................................................................................31
Troubleshooting Bias Supplies.......................................................................................................................................33
Power Section Blocks.....................................................................................................................................................35
Troubleshooting AC-Turn-on Circuits............................................................................................................................35
Troubleshooting PWM & Clock.....................................................................................................................................36
Troubleshooting DC-To-DC Converter..........................................................................................................................37
Troubleshooting CV Circuit........................................................................................................................................... 38
Troubleshooting CC Circuit............................................................................................................................................38
Troubleshooting Down Programmer.............................................................................................................................. 39
Troubleshooting OVP Circuit.........................................................................................................................................39
Principles of Operation........................................................................................................................................................ 43
Autoranging Power.............................................................................................................................................................43
Block Diagram Overview...................................................................................................................................................43
Simplified Schematic......................................................................................................................................................45
DC-to-DC Converter.......................................................................................................................................................47
Down Programmer..........................................................................................................................................................47
Constant-Voltage (CV) Circuit.......................................................................................................................................48
Constant-Current (CC) Circuit........................................................................................................................................49