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Z axis moves down by clicking the icon with red background,
and moves up by clicking the icon with green background. The
LCD will project a black and white grid after clicking Show
Blank Screen and it needs turn on the LED firstly by Check
function through the touch screen, this can be used to check
whether the function of LCD projection is well (make sure
there is no rein in the vat or building platform during check
function of LED and LCD, otherwise the resin will be cured).