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Trumpet does not make sound.

Make sure the order and direction of the piston valves, and the valve guides are correct.

Insert the piston valves into the valve casings and the piston valves should be numbered 1st, 2nd, and 3rd from the mouthpiece side.
If the valve guide is upside down or left and right incorrectly, the piston valve may rotate and the instrument does not make sound.

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