Repair Lonsdor K518ise smoke problem when we turn on it

Recently Lonsdor K518ise user feedback:There will be smoke problem when I turn on it , returned to repair and in the same situation.
The reason: because customers use their own power supply, not the power from us.
Lonsdor K518ise board comes with a capacitor inside is to prevent customers from using other power supply, if you use another power supply will burn out the capacitor, causing the machine to smoke.
The solution is to remove this capacitor (if you use your own power supply)

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