Lincoln Electric SP-100 Service Manual page 37

TABLE OF CONTENTS
- TROUBLESHOOTING SECTION -
Troubleshooting .............................................................................................Section F
Safety Precautions ................................................................................................F-1
How To Use Troubleshooting Guide .....................................................................F-1
PC Board Troubleshooting Procedures .................................................................F-2
Troubleshooting Guide...........................................................................................F-3
Output Problems .............................................................................................F-3
Feeding Problems ...........................................................................................F-6
Gas Flow Problems .........................................................................................F-7
Welding Problems ..........................................................................................F-7
PC Board Connector Locations .............................................................................F-8
Oscilloscope Waveforms
Normal Open Circuit Voltage Waveform .........................................................F-9
Typical Output Voltage Waveform - Machine Loaded .................................F-10
Abnormal Open Circuit Voltage Waveform ..................................................F-11
Replacement Procedures
Fan Blade and Motor Removal......................................................................F-12
Wire Drive Assembly Removal......................................................................F-13
Retest After Repair .............................................................................................F-14
Section F
SP-100