TROUBLESHOOTING AND FAULT FINDING
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.
DO NOT REPAIR OR MODIFY MACHINE IF STILL UNDER WARRANTY
If the machine fails to work after maintenance and checks, please contact your local distributor or our
after-sale service center.
WARNING! Experimentation and careless maintenance may lead to more
problems to the machine. This will make formal diagnostic and repair more
difficult. When the machine is open there may be exposed connections
containing life-threatening voltages. Any direct or indirect touch will cause
electric shock, and severe electric shock will lead to death.
Power indicator is
not lit, fan does
not work and no
welding output
1. Make sure power switch is working.
2. Check connections from ON switch to power board are in good condition, check continuity of
ON OFF switch.
3. Check if the plug point you are using is working.
4. Check if supply voltage is correct
5. Control board might be faulty.
Power indicator is
lit, fan works, no
welding output
1. Check if all cables are connected properly.
2. Output connector is disconnected or damaged.
3. Control circuit might be faulty.
QC (Quality
Control) LED is
on, permanently
or when striking
an arc
1. Can be in overheat protection; wait for 15 minutes.
2. Maybe it is overcurrent protection, turn machine off for 30 seconds then switch on again. If
QC still on - not working there is a fault on the board.
3. IGBT on control board might be faulty.
4. Fast recovery diodes or transformer might be faulty.
Output Current is
not stabilized
1. Supply voltage is not stable.
2. There is harmful interference from supply voltage or other equipment.
3. Bad connections - Hot/bad connections or points on earth cable or electrode holder can
cause current to drop or be unstable.
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