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TABLE OF CONTENTS
SECTION 6:
TROUBLESHOOTING................................................................................. 6-1
6.01
6.02
6.03
6.04
6.05
6.06
6.07
6.08
6.09
6.10
6.11
6.12
6.13
6.14
6.15
6.16
Power Source Status Messages....................................................................... 6-1
Error Messages................................................................................................ 6-2
Test Equipment and Tools................................................................................ 6-5
Visually Inspect................................................................................................ 6-6
Temperature Monitoring.................................................................................. 6-7
Monitoring Bus Voltage................................................................................... 6-8
Monitoring Output Voltage............................................................................. 6-10
Supply Voltages............................................................................................. 6-11
Monitoring Welding Current.......................................................................... 6-12
Open Circuit Voltage Generator & VRD.......................................................... 6-13
Fan Control.................................................................................................... 6-13
Monitoring Mains Input................................................................................. 6-14
Machine Configuration................................................................................... 6-14
Monitoring Primary Input Current................................................................. 6-16
PCB Connectors............................................................................................. 6-17
Circuit Diagram.............................................................................................. 6-27
SECTION 7:
REPLACEMENT PARTS............................................................................... 7-1
7.01
401MST Power Source Spare Parts................................................................. 7-1
TWECO - LIMITED WARRANTY TERMS................................................ Inside Rear Cover