TROUBLESHOOTING AND FAULT FINDING
DO NOT ATTEMPT TO REPAIR MACHINE IF STILL UNDER WARRANTY
Notes: only attempt to repair this machine if you have knowledge and understanding of
electronic components and the dangers of electricity and components holding a charge of high
voltage electricity. Before maintenance contact us for authorization is suggested.
Power indicator
is not lit, fan
does not work
and no welding
output
1. Make sure power switch is working.
2. Check if the plug point you are using is working.
3. Some of heat-variable resistors of power board are damaged, when that
happen, general DC24V relay is open or connectors have poor contact.
4. Power board is damaged, DC310V voltage cannot be sent to the control
board.
4.1 Silicon Bridge is broken or connector of Silicon Bridge has poor
contact.
4.2 Power board has been burnt.
4.3 Check connections from on switch to power board are in good
condition, check continuity in on off switch.
4.4 Check cable from power board to MOS board (top board) are
connected properly.
5. Auxiliary power of control board is faulty.
Power indicator
is lit, fan works,
no welding
output
1. Check if all cables are connected properly.
2. Output connector is cut off or damaged.
3. Control cable or switch of torch is broken.
4. Control circuit is damaged.
Power indicator
is lit, fan works,
and abnormal
indicator is lit.
1. Can be in overheat protection; wait for 2-3 minutes.
2. Maybe it is overcurrent protection, turn machine off for 30 seconds then
switch on again. If still not working there is a fault on the MOS board.
3. Maybe inverter circuit is in fault, please unplug the supply power plug
of main transformer which is on MOS board (VH-07 insert which is
near the fan) then switch the machine on again.：
3.1-If abnormal indicator is still lit,:
Field mosfets of MOS board is damaged.
3.2-If abnormal indicator is not lit,:
Transformer of middle board is damaged. or
Secondary rectifier of transformer board is damaged.
If the machine fails to work after maintenance and checks, please contact your local
distributor or our after-sale service center.
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