D-5
MAINTENANCE AND TROUBLESHOOTING
D-5
TROUBLESHOOTING
Item
PROBLEMS(SYMPTOMS)
POSSIBLE CAUSE
RECOMMENDED COURSE OF
ACTION
1
Turn on the power source, and
the power light is not on, and fan
doesn
’t work
No input voltage.
Check whether there is input
voltage.
The line switch is damaged.
Check and replace line switch.
2
Turn on the power source, and
fan works, but the power light is
not on.
The power light damaged or
connection is faulty.
Test and repair the circuit on front
PCB.
Precharge circuit or auxiliary switch
power source circuit are faulty.
Check relevant components around
it on main PCB board.
3
Turn on the power source, and
the power light is on, but fan
doesn
’t work
Fan blocked.
Remove blockage.
The power connector of fan motor is
loose or damaged.
Check, fix or replace the power
connectors of fan motor.
The fan motor damaged.
Change fan motor.
4
No no-load voltage output
There is trouble inside the machine.
Check the main circuit inside
machine.
5
No welding output
Welding cable is not connected to the
output terminals.
Connect the welding cable to the
output terminals.
Welding cable is broken.
Repair or replace the welding cable
Work cable is not connected or loose.
Check connection of the work
clamp.
The isolated circuit for TIG trigger is
faulty.
Check relevant components around
it on main PCB board.
The main loop circuit is faulty.
Check input rectifier, IGBT
transistors, output diodes and drive
circuits.
6
Not easy to start arc welding, or
easy to cause sticking
The plug loose or poor connect
Check and tighten the plug.
Contamination on the workpiece
Check and clean joint.
SMAW/GTAW welding selection is
wrong
Select the correct welding modes.
7
Arc break during welding
The welding current adjusted too low
during DC welding.
Increase the welding current.
