Chapter 55-13F-5-255.3.5 Dirt Sensor Control5.3.5.1 Dust Detection in Stream Reading Mode0008-7512The machine uses the dust detection control mechanism to check for dust on the platen glass and the ADF platen roller, thus preventing reproduction ofdust, if any, in output images.Timing of Control1. at the end of a job2. between sheets (for every sheet)F-5-26*Executed only if dust has been detected at all points (A, B, C, D, E) during the previous job. In such a case, the machine will use the point subjected toleast dust, and executes correction before starting a read operation.Particulars of Control- At the End of a Job (changing the stream reading dust read position)The machine measures the light reflected by the surface of the platen roller, and detects the presence/absence of dust with reference to its intensity. Ifthe presence of dust is detected, the machine moves to the next point (5 points max.; A -> B -> C -> D -> E).The machine uses the first point at which the absence of dust is detected as the read point for the next job.1A B 2A B 3A B 4A B 1A B 2A B 3A BOriginalsizeA3B4A4RA4B5B5RA5B6noneOriginalsensor 1CCD pointof detectionAB-ConfigurationOriginalsize11"x17"LGLLTRRLTRSTMTRSTMTabsentCCD pointof detectionInch-configurationchange absent :change presentOriginalsensor 3Dust detection control* Dust detectioncontrolDust detection controlStart keyON1stSCAN2ndSCAN
