#3483 Arrow X on ULTRA

The X arrow is a phenomenon that distorts the flatness of the board. The X axis is not an element that will influence the X arrow.
After removing the glass-ceramic or magnetic tray, you must check the tightness of the central screw. Because there must be half a millimeter between the aluminum plate and the ceramic glass plate (see photo). Otherwise, it will be convex when heating and produce this kind of problem.

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