The thermal management and method for large scale processing of CIS andor CIGS based thin film overlaying glass substrates. The second convey roller rotates in a reverse direction by a first rotation amount corresponding to a first linear distance to convey the sheet in a direction opposite to the sheet conveying direction, such that the leading edge of the sheet is released from the nip of the second convey roller. Methods and apparatus for their implementation are described for detecting the pulse width of a PWM signal in the PWM circuit. The central body has an aperture dimensioned to receive and mechanically engage the insertion end of the first spray head. This problem is solved by providing a reception unit for receiving images generated from a plurality of communication terminals, an output unit for outputting the images received by the reception unit in order to dipslay the images on a display unit as multiple images, and a notification unit for grasping and notifying a state of reception of the images by the reception unit.