Fan is working ,indicator is not lit
and sound of HF arc-striking can not
be heard ,wiping welding can not
strike arc.
Positive and negative electrodes of VH-07 insert component voltage
should be about DC310V from power panel to MOS board .
(1) If circuit is broken and silicon bridge is poor contact .
(2) If some of four high electrolytic(about 470UF/450V) of power panel
capacitor is leaking .
There is a green indicator in auxiliary power of MOS board ,if it is not on
,auxiliary power is out of work .Check fault spot and connect with seller .
Check if connectors is poor contact .
Check control circuit and find out reasons or connect with seller.
Check if control cable of torch is broken.
1
2
3
4
5
3
Abnormal indicator is not on ,sound
of HF arc-striking can be heard ,but
there is no welding output .
Check if torch cable is broken .
Check if grounding cable is broken or not connected to welding piece .
Output terminal of positive electrode or torch electrify is loosed from
inter-machine .
1
2
3
4
Abnormal indicator is not lit ,sound of
HF arc-striking can not be heard
,wiping welding can strike arc .
Primary cable of arc-striking transformer is not connected to power panel
firmly ,tighten it again.
Arc-striking tip is oxidized or too far ,give a good polish to it or change it is
about 1 mm between arc-striking tip .
Switch(sticking/argon-arc welding) is damaged ,replace it .
Some of HF arc-striking circuit components is damage ,find out and
replace it .
1
2
3
4
5
Abnormal indicator is lit but there is
no welding output .
Maybe it is overheated protection ,please close machine first ,then open
the machine again after abnormal indicator is out .
Maybe it is overheated protection ,wait for 2-3 minutes (argon-arc welding
does not has overheated protection function .)
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.
1
2
3
4
6
(1)
(2)
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 :
a. If abnormal indicator is still lit ,some of fieldistor of MOS board is
damaged ,find out and replace it with same model .
b. If abnormal indicator is not lit , rise transformer of HF arc-striking
circuit is damaged ,replace it .
If abnormal indicator is not lit ,
a. Maybe transformer of middle board is damage ,measure inductance
volume and Q volume of main transformer by inductance
bridge(L=0.9-1.6mH Q>35) .If volume 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 broken .
When welding aluminum, can not
break oxidized film
Wrong welding value
Pulse duty too low
Twice inverter MOSFET broken
1
2
3
7
Stick is burnt out
Pulse duty is too high, reduce it.
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