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It's a common mode choke. It might also work as a transformer but that isn't what it's designed for. You will find it is wired between the AC fuse and the rectifiers, it's purpose is to pass the differential AC power through but by virtue of the winding direction, it cancels common mode signals. It is part of the interference supression circuit and you will almost certainly find an X2 rated capacitor across both sides of it.
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