Jasic MIG 250C, Operator'S Manual

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42
TROUBLESHOOTING
The following operation requires sufficient professional knowledge on electric aspects and
comprehensive safety knowledge. Make sure the input cable of the machine is disconnected
from the electricity supply and wait for 5 minutes before removing the machine covers.
Before arc welding machines are dispatched from the factory, they have already been checked
thoroughly. The machine should not be tampered with or altered. Maintenance must be carried out
carefully. If any wire becomes loose or is misplaced, it maybe potentially dangerous to the user!
Only professional maintenance personnel should repair the machine!
Ensure the power is disconnected before working on the machine. Always wait 5 minutes after power
switch off before removing the panels.
Description of fault Possible cause
The power LED is OFF and the fan is not
functioning The primary supply voltage has not been switched ON
or input fuse has blown
The welding power source input switch is switched
OFF
Loose connections internally
The fault LED is ON and the fan is running The machine is under over - heating protection status
It can recover automatically after the welding
machine is cooled
Check incoming mains supply to ensure it is within
230V +/
- 15% or 400 +/ - 15% (depending on model)
Wire feed motor does not rotate when the Wire feed speed may be set to zero
MIG torch trigger switch is depressed Check supply to wire feed motor
Motor PCB may be faulty
Welding current reduces when welding Poor work lead connection to the work piece
TIG electrode melts when arc is struck TIG torch is connected to the (+) VE terminal
No gas flow when the MIG torch trigger
switch is depressed Empty gas cylinder
Gas regulator is turned off
Gas hose is blocked or cut
Torch trigger switch lead is disconnected or
switch/lead is faulty
Difficult to ignite the arc The welding voltage is too low or the wire feed speed
is set too high
The electrode holder becomes very hot The rated current of the electrode holder is smaller
than its actual working current, replace it with a
higher rated current capacity
Excessive spatter in MMA welding The output polarity connection is incorrect, exchange
the polarity
Other malfunction Contact your supplier
Overheat LED lights up Let the machine cool, it will automatically start again
Insufficient cooling air
Cooling fan is not running
Wire continues to feed through when the
MIG torch switch is released The trigger mode switch is set to 4T rather than 2T
Faulty MIG torch switch