➢ Cable of torch is broken.
➢ Grounding cable is broken or not connected to work piece.
➢ There is relaxation between output terminal of positive electrode, gas-
electricity system output terminal and inner machine.
➢ Primary cable of arc-striking transformer is poor contact with power
board, tighten it again.
➢ Arc-striking tip is oxidized or distance is too far, get rid of film oxide of
burner or adjust the distance between burners to be 1mm.
➢ Switch (sticking/argon-arc welding) is damaged, replace it.
➢ Some of HF arc-striking circuit components is damage, find out and
replace it.
➢ Overload current protection may start, please turn off machine first, then
restart it after abnormal indicator is off.
➢ Overheat protection may start. It will become normal in 2-3 min.
➢ Inverter circuit may go wrong, please disconnect the power supply plug
of the main transformer on MOS board (close to insert of fan VH-07)
then restart the machine.
(1) If abnormal indicator is still on, turn off machine and disconnect
power supply plug of HF arc-striking power source (close to insert of
fan VH-07), then restart machine:
a) If abnormal indicator is still on, some fieldistors on MOS board
are damaged, find out and replace them with same model.
b) If abnormal indicator is off, up-slope transformer of HF arc-
striking circuit is damaged, replace it.
(2) If abnormal indicator is off:
a) Maybe transformer on middle board is damage, measure
primary inductance volume and Q value of main transformer by
inductance bridge (L=0.9-1.6mH Q>35). If value is too low,
please replace it.
b) Maybe secondary rectifier tube of transformer is damaged, find
out faults and replace rectifier tube with same model.
➢ Maybe feedback circuit is open.
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