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Ramps board - Smoke from Q3 (4 replies)

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Hi all,
I have problem I cant solve. Till tomorrow I printed fine, but today when I heated up the heatbed smoke showed from the place of Q3 position. Q3 was melted and broken so I bought the new one a replaced it. But when I turn heat on bed 120°C, the
Q3 is becomming from silver color to grey and start overheating.

Does anybody know what is the cause ?

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