Canon 1692B002 Service Manual - Page 66
Paper path system, 5.5 Humidity sensor
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Chapter 2 Multi sensor The photoreflector-based multi sensor consists of four LEDs (red, blue, green, infrared) and two light-receiving sensors to detect the leading edges and width of paper and skews in it, and to adjust its registration, head height and calibration. At head height adjustment, the two light-receiving sensors detect infrared light reflected upon the paper to work out the head height from differences in its measurement. LED(red) LED(green) LED(blue) Infrared sensor Infrared LED Media F-2-31 Platen 2.5.4 Paper path system 0014-8916 Feed roller HP sensor Feed roller encoder Media sensor F-2-32 Media sensor The photoreflector-based media sensor detects the presence or absence of paper on the platen. The sensor detects the presence of paper when it receives sensor light reflected upon the paper. Feed roller HP sensor The feed roller HP sensor detects transitions from white (transmitted), or a reference, to black (shielded) when the printer is switched on, thereby setting the home position of feed roller eccentricity correction. Feed roller encoder The feed roller encoder is driven to detect the length of paper feeding for each rotation of the feed roller from encoder slits. 2.5.5 Humidity sensor 0013-8116 Humidity sensor 2-24 F-2-33