def METHOD_NAME(self):
    """
    Open all switches.
    For each device, iterate all x-y combinations and
    open all the switches at once.
    """
    ldsw = self._ldsw
    for x in range(self._xmax):
        for y in range(8):
            self._ldsw = False
            if (y == 7) and (x % 12 == 11):
                self._ldsw = True
            self[x][y] = False
    self._ldsw = ldsw