Epson Stylus Pro 7600 - UltraChrome Ink Service Manual - Page 111
Simplified Detection Sequence for Left and Right Edges
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EPSON Stylus Pro 7600/9600 Simplified detection sequence for left and right edges (skew check) When the paper width detection function is turned off, left and right edge detection (skew check) is not carried out. Error display: 1: Set the paper correctly 2: PAPER NOT STRAIGHT CHECK P O IN T Transition to this sequence is allowed only at inter-page skew checking (at cut/eject, etc.) At paper initial, transition to "Paper size detection sequence (left and right edges)" (p.109) takes place. Right edge detection position Solid Line: Paper Broken Line: Printable Area Left edge detection position Previously determined paper width X mm Revision A Left and right edge detection start a Note "*1": Paper presence position = 215.4 mm Paper absence position = 132.9 mm LED turns off upon completion of skew check. "*2": Printing area MIN position =142.9 mm -4.0 mm (Reserved width) A4 size (210.0 mm) - 20.0 mm = 190.0 mm CR moves to the paper presence position (100CPS). Flashing during acceleration on Fl_Box Moving to paper absence position. Threshold value is calculated during moving to paper presence position. After determination of threshold value, edge sensor LED is kept on. *1 CR moves to the position "printing area MIN position + A4 size - 20 mm = 328.9 mm" (350CPS) *2 While monitoring the edge sensor output, CR moves toward the home to the printing area MIN position (350CPS). Paper absence detected No ? Yes From the position where the sensor output has changed, CR moves by 2 mm outward (240CPS). While monitoring the edge sensor output, CR moves toward the home at 5 cps. The position where paper absence is detected is judged to be the left edge position of the paper. The paper width determined by the previously executed left and right edge detection (at paper initial or skew check) is added to the left edge position. The resultant position is regarded as the paper right edge position. Edge sensor LED is turned off. Error 1 Paper right edge position deflected by 3 mm from previously determined position? No Paper left edge position deflected by 3 mm from previously determined position? No Edge sensor LED is turned off. Return Yes Yes Edge sensor LED is turned off. Error 2 Figure 2-9. Simplified Detection Sequence for Left and Right Edges (Skew Check) Operating Principles Print Mechanism Components 111