21
S/N
Troubles
Reasons
Solution
The fan motor damaged
Change fan
3
Turn on the power source, and
the power light is not on and fan
doesn’t work.
No power supply input
Test the power supply input
The power supply resistance is broken
Change the resistance (4
Ω)
4
No no-load voltage output
(MMA)
The machine is damaged
Check the main circuit and the PCBs
5
Arc can not be
ignited (TIG)
There is spark
on the HF
igniting board.
The welding cable is not connected with the
two output of the welder.
Connect the welding cable to the
welder’s output.
The welding cable damaged.
Repair or change it.
The earth cable connected unstably.
Check the earth cable.
The welding cable is too long.
Use an appropriate welding cable.
There is oil or dust on the workpiece.
Check and remove it.
The distance between tungsten electrode and
workpiece is too long.
Reduce the distance (about 3mm).
The distance between the discharger is too
short.
Adjust this distance (about 0.7mm).
The malfunction of the welding gun switch.
Check the welding gun switch, control
cable and aero socket.
6
HF striking arc can not be
stopped
Check the main PCB and control PCB
Repair or change it.
7
No gas flow (TIG)
Gas cylinder is close or gas pressure is low
Open or change the gas cylinder
Something in the valve
Remove it
Electromagnetic valve is damaged
Change it
8
When welding, it is hard to
strike arc or easy to
stick.(MMA)
Connector is loose or connection is not good.
Check and screw it.
There is oil or dirty on the workpiece.
Check and clear it.
9
The welding current can not be
adjusted
The welding current potentiometer on the
front panel connection is not good or
damaged
Repair or change the potentiometer
Not short the 2pin and 3pin of J-MB on the
front panel
Short it
10
The penetration of molten pool
is not enough.
The welding current is adjusted too low
Increase the welding current
The arc is too long in the welding process
Use the short-arc operation
11
Arc deflection.
Air interference
Keep out air
Electrode deflection
Change new electrode.
Adjust another angle to weld
Magnetic field
Use the short-arc operation
Change the position of earth cable
Change welding direction
12
The alarm light on the front
panel is on
Over heat protection
Two much welding
current
Reduce the welding current output
Working time too
long
Reduce the duty cycle (work intervally)
Over-voltage
protection
Power supply
fluctuates
Using the stable power supply
Low-voltage
protection
Power supply
fluctuates
Using the stable power supply
Too many machines
using power supply
in the same time
Reduce the machines using power
supply in the same time
Over-current
protection
Unusual current in
the main circuit
Check and repair the main circuit and
control PCB
