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.....................................................................................................................................................................12
Performance Tests.............................................................................................................................................................. 16
Measurement Techniques............................................................................................................................................... 16
Constant Voltage (CV) Tests..........................................................................................................................................18
Constant Current (CC) Tests...........................................................................................................................................24
Troubleshooting.................................................................................................................................................................... 27
Introduction.........................................................................................................................................................................27
Initial Troubleshooting Procedures.....................................................................................................................................27
Electrostatic Protection....................................................................................................................................................... 29
Repair and Replacement..................................................................................................................................................... 29
A2 Control Board Removal............................................................................................................................................ 30
A4 FET Board Removal................................................................................................................................................. 30
A5 Diode Board Removal...............................................................................................................................................31
A3 Front Panel Board Removal......................................................................................................................................31
A1 Main Board Removal................................................................................................................................................31
Overall Troubleshooting Procedure....................................................................................................................................32
Using the Tables............................................................................................................................................................. 33
Main Troubleshooting Setup.......................................................................................................................................... 33
Troubleshooting No-Output Failures..............................................................................................................................36
Front Panel Troubleshooting...........................................................................................................................................36
Troubleshooting Bias Supplies....................................................................................................................................... 38
Power Section Blocks..................................................................................................................................................... 40
Troubleshooting AC-Turn-on Circuits............................................................................................................................40
Troubleshooting PWM & Clock.....................................................................................................................................41
Troubleshooting DC-To-DC Converter..........................................................................................................................42
Troubleshooting Down Programmer.............................................................................................................................. 42
Troubleshooting CV Circuit........................................................................................................................................... 44
Troubleshooting CC Circuit............................................................................................................................................44
Troubleshooting OVP Circuit.........................................................................................................................................45
Principles of Operation........................................................................................................................................................ 47
Autoranging Power.............................................................................................................................................................47
Overview.............................................................................................................................................................................47
System Description.............................................................................................................................................................47
Regulation & Control Subsystem....................................................................................................................................... 48
Protection Subsystem..........................................................................................................................................................53
Input Power Subsystem...................................................................................................................................................... 53