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Abnormal indicator is lit but there is
no welding output.
1. Maybe it is overheated protection, please close machine first, then turn on the
machine again after abnormal indicator is out.
2. Maybe it is overheated protection, wait for 2-3 minutes (argon-arc welding does
not has overheated protection function.)
3. Maybe inverter circuit is in fault, please pull up the supply power plug of main
transformer which is on MOS board (VH-07 insert which is near the fan) then
open the machine again.
4. If abnormal indicator is still lit ,close machine and pull up supply power plug of HF
arc-striking power source (which is near the VN-07 insert of fan ),then open
machine:
5. If abnormal indicator is still lit, some of MOSFET of MOS board is damaged, find
out and replace it with same model.
6. If abnormal indicator is not lit, rise transformer of HF arc-striking circuit is
damaged, replace it.
7. If abnormal indicator is not lit.
8. Maybe transformer of middle board is damage, measure inductance value and Q
value of main transformer by inductance bridge (L=0.9-1.6mH Q>35). If value is
too low, please replace it.
9. Maybe secondary rectifier tube of transformer is damaged, find out faults and
replace rectifier tube with same model.
10. Maybe feedback circuit is broken.
Output current is not stabilizing or
out of potentiometer control and
sometime is high, sometime is low.
1. 1K potentiometer is damage, replace it.
2. All kinds of connectors are poor contact, specially inserts etc. please check it.
Sticking spatter is much and
caustic electrode of is difficult .
Electrode is connected wrong, exchange grounding cable and handle cable.
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