Plasma diagnosis
LGK-100 Plasma Cutter No-Arc Routing
A step-by-step route for separating air, torch, pilot-arc, work-clamp and main-output faults on LGK-100 class plasma cutters.
Symptom route
| Observed symptom | First evidence | Repair note |
|---|---|---|
| Machine powers on but no arc | Check input power, fan, protection lamp and air pressure. | Do not replace the board before verifying external conditions. |
| Air present but no pilot arc | Check torch switch, pilot lead, consumables and HF/pilot section. | Worn electrode or incorrect nozzle order can stop pilot ignition. |
| Pilot arc but no cutting arc | Check work clamp, torch distance, transfer path and main output. | Poor work connection can block arc transfer. |
| Weak cut or unstable arc | Check air pressure, wet air, current setting, nozzle damage and output current. | A machine can have pilot activity but still fail under load. |
| Protection lamp on | Resolve thermal, input or control protection before output testing. | Protection state invalidates most output measurements. |
