焊機維修前應先做以下檢查：

Before welding machine maintenance should do the following check:

1. 焊機前面板各開關位置是否正確。

1. The welder front panel switch position is correct.

2. 三相電源的線電壓是否在340V~420V范圍內；是否有缺相。

2. Three phase power line voltage is 340 v to 420 v range; If there is a lack of phase.

3. 焊機電源輸入電纜是否正確可靠。

3. The welding machine power input cable is correct and reliable.

4. 焊機接地線是否可靠正確

4. The welder reliable grounding line is correct

5. 焊機電纜接線是否正確，接觸是否良好。

5. Cable wiring is correct, contact are in good condition.

6. 氣路是否良好，CO2氣體調節器是否正常。

6. Gas circuit are in good condition, CO2 gas regulator is normal.

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