Problems
Ventilation fan running,abnormal indicator light is off,no high frequency discharge with “sha sha” noise,no arcing when struck.
Causes and Solutions
1.Use a multimeter.to check the voltage of the positive and negative poles on the VH-70 plug-in unit between the power panel and the MOS panel,it should be about DC310V.
2.If the green auxiliary power source indicator light on the MOS panel is off,it means the auxiliary power source is not working; check for fault or contact the dealer.
3.Check for any poor contact of the various wiring connections inside the machine.
4.Circuit control problems,check for causes or contact the dealer.
5.Control cable of welding torch severed.
Problems
Abnormal indicator light is off,high frequency discharge with “sha sha” noise,
No welding output current.
Causes and Solutions
1.Welding torch cable severed.
2.Grounding cable severed or not connected to welded object.
3.The output terminal of the positive pole or the output terminal of electro-gas of the welding torch that connects with the joint inside the machine loosened or disconnected.
Problems
Abnormal indicator light is off,no high frequency discharge with “sha sha” noise,
arc striking effective.
Causes and Solutions
1.Poor contact between the primary cable of arc strike transformer and the power panel,retighten.
2.Discharge nozzle oxidized or the gap too wide.Remove the oxide film or adjust the gap to 1mm.
3.Certain parts of the arc striking circuit damaged; check for them and replace them.
