An image reproducing apparatus includes a selector which selects output of the MPEG decoder in a reproducing mode. The device includes an adjustment mechanism for storing desired characteristics for the beam, determining values of adjustment parameters of the apparatus according to its characteristics, storing these values, and giving these stored values to the adjustment parameters of the apparatus. The first operation includes one of a programming or erasing operation. The connector includes co-acting male and female components extending circumferentially about the axis and at least one of the male and female components is spaced longitudinally along the axis for connecting the plates at any one of the various distances in response to relative rotation between the male and female components about the axis. A plurality of discharge passages are each branched from an end portion of the introduction passage on a side opposite to the introduction port and extend to corresponding one of the discharge ports in a direction tilted from the longitudinal direction.