Basic Troubleshooting - Nielsen CT4973 Original Instruction

4.3 BASIC TROUBLESHOOTING

TROUBLE
1.Machine does not work.
2. The welding machine is
operated, LED1 is off, no
output, the fan is not
running.
3.Wire feeder works but
wire is not fed.
4．Trouble in welding
operation.
5. While this welding
machine is operated, the
LED2 is on, no current
output.
6．Welding current or
voltage cannot be adjusted.
7．Welding current or
voltage isn't stabilized.
MAINTENANCE AND TROUBLESHOOTING
REASON
Power source switch is out of order.
Fuse is blown out.
Electronic Card is out of order.
Possible function failure of power switch.
Possible short circuit of input cable.
Fan motor is out of order.
The drive roll is not appropriate for the
wire diameter.
Pressure in the pressure roll is not
enough.
Contact tip size is wrong or bad.
Pressure in the pressure roll is not
enough.
CO heater fuse is blown out.
2
Protective gas pressure is not
appropriate.
It is possible of over-heating protection status.
It is possible of over-current protection status.
The secondary rectifier of transformer is possibly
damaged.
The feed back circuit is possibly damaged.
Possible unavailability of the connection of switch. Check and Reconnect it.
The main control PCB is out of order.
Pressure in the pressure roll is not
enough.
Gas flow rate is not enough.
Circuits are possibly damaged.
Possible capacitors are possibly damaged.
Possible unavailability of connection inside this
welding machine.
Possible disconnection of earth cable, or
unavailability of connection of the earth cable and
work-piece.
Change the switch.
Change the fuse.
Contact your authorized technical service.
Compensate it if necessary.
Compensate it if necessary.
Change the Fan motor.
Select the appropriate drive roll.
Adjust the pressure.
Change the contact tip.
Adjust the pressure roll.
Check and Replace it if necessary.
Check the gas and adjustment.
Wait till the LED2 is off, and the welding
operation will be available.
Wait till the LED2 is off, or switch off the
power supply, restart ON/OFF Switch of the
welding machine.
Check and Replace it if necessary.
Check and Replace it if necessary.
Change the control PCB
Adjust the pressure roll.
Adjust the gas flow rate
Check and replace them if necessary.
Replace them if necessary.
Check and reconnect if necessary.
Check and reconnect if necessary.
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REMEDY