Lincoln Electric SVM120-A manual

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Section F-1

TROUBLESHOOTING & REPAIR SECTION

Troubleshooting & Repair Section	Section F
How to Use Troubleshooting Guide	F-2
PC Board Troubleshooting Procedures	F-3
Troubleshooting Guide	F4 - F-20
Test Procedures
Rotor Voltage Test	F-21
Rotor Resistance Test	F-23
Auxiliary and Field Winding Test	F-25
Output Rectifier Bridge Test	F-29
Charging Circuit Test	F-31
Protection Relay (CR1) Test	F-33
Engine Throttle Adjustment Test	F-35
Oscilloscope Waveforms	F-39
Normal Open Circuit Voltage Waveform (115 VAC Supply)	F-39
Typical DC Weld Output Waveform (CV Mode) – Machine Loaded	F-40
Typical DC Weld Output Waveform – Machine Loaded	F-41
Typical AC Weld Output Waveform – Machine Loaded	F-42
Abnormal Open Circuit Weld Voltage Waveform (one diode open)	F-43
Abnormal Open Circuit DC Weld Voltage Waveform
(High CV Mode) – Output Capacitor Bank not Functioning	F-44
Normal Open Circuit Weld Voltage Waveform (High CV Mode)	F-45
Normal Open Circuit DC Weld Voltage Waveform	F-46
Normal Open Circuit AC Weld Voltage Waveform	F-47
Replacement Procedures	F-48
Brush Removal and Replacement	F-48
Field Capacitor and Rectifier Bridge Removal and Replacement	F-51
Control Board Removal and Replacement	F-54
Output Rectifier Bridge Removal and Replacement	F-57
Output Capacitor Removal and Replacement	F-60
Output Contactor Removal and Replacement	F-62
Stator and/or Rotor Removal and Replacement (Kit S20788)	F-65
Retest After Repair	F-70

RANGER 10-LX