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TROUBLESHOOTING & REPAIR | ||
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| TABLE OF CONTENTS |
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| TROUBLESHOOTING AND REPAIR SECTION | Section F |
| How to Use Troubleshooting Guide | |
| Safety Precautions | |
| PC Board Troubleshooting Procedures | |
| Troubleshooting Guide | |
| Output Problems | |
| Function Problems | |
| Welding Problems | |
| Test Procedures |
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| Control Transformer (T2) Voltage Test | |
| Main Transformer (T1) Voltage Test | |
| Firing Board Test | |
| Control Board Test | |
| Static SCR Test | |
| Active SCR Test | |
| Oscilloscope Waveforms |
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| Normal Open Circuit Voltage Waveform Constant Current Mode | |
| No Load |
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| Normal Open Circuit Voltage Waveform Constant Voltage | |
| Innershield - Maximum Output Setting - No Load |
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| Normal Open Circuit Voltage Waveform Constant Voltage | |
| Innershield - Minimum Output Setting - No Load |
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| Typical Output Voltage Waveform - Machine Loaded Constant Voltage | |
| Innershield Mode |
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| Typical Output Voltage Waveform - Machine Loaded | |
| 500 Amp Output Terminal Constant Voltage Innershield Mode |
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| Typical SCR Gate Voltage Waveform Constant Voltage | |
| Innershield Maximum Output Setting - No Load |
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| Abnormal Open Circuit Voltage Waveform Constant Voltage | |
| Innershield One Output SCR Not Functioning Maximum Output Setting |
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| Replacement Procedures |
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| Input Contactor Cleaning and or Replacement | |
| SCR Output Bridge Replacement | |
| SCR Output Bridge Removal | |
| Removal of Individual SCR Heat Sink Assemblies | |
| SCR Heat Sink Installation | |
| SCR Output Bridge Installation | |
| Removal and Reassembly of Lift Bail | |
| Removal of Lift Bail | |
| Reassembly of Lift Bail | |
| Main Transformer Removal and Installation | |
| Main Transformer Disassembly and Assembly | |
| Main Transformer Disassembly | |
| Coil Removal and Replacement | |
| Transformer Reassembly | |
| Retest After Repair |