Canon NP6012 Service Manual

Also see for NP6012: Service manual

OPERATIONS AND TIMING Ba2. Relationship between the Scanner Sensor and SignalsReference used to determine the forwardScanner home travel distance.Position sensor(PS1) The scanner stops traveling in reverse in0.1 sec.Table 3-2013. Basic Sequence of Scanner OperationsPower switch Copy Start keyON QNL_INTR [ SCEW |SCRV]“SCEWTSCAV[CSTR]Registration sensor (Q751)}+-————______,CO a aom on ZA omPema | | | |_| |LLSTR [STBYSScanner home positionsensor (PS1)ScannerScanner lamp (FL1)YZ: reverse@® : detects scanner home position@ : detects lens home positionFigure 3-205The microprocessor on the DC controller PCB controls the forward travel distance of thescanner with reference to the rising edge of the scanner home position signal. The forward trav-el distance varies depending on the length of copy paper” and the selected reproduction ratio inENLARGE: if the ratio is less than 130%, the scanner is moved forward for A4 (297 mm); if theratio is 130% or more, the scanner is moved for LTR (279 mm).“For a discussion of how the length of copy paper is checked, see p. 3-49.COPYRIGHT © 1995 CANORINC. CANON NP6O12/NPGO12F /NP6212 REV.1 SEPT. 1995 PRINTEDINJAPAN (IMPRIME AU JAPON} 3-15