HP LaserJet M9040/M9050 Service Manual - Page 364
ADF skew adjustment, Use a sheet of paper that allows you to measure at least 257 mm 10.1 inches.
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4. If the gap is not within specifications, loosen the fixing nut and turn the two ADF height adjust screws. Turn the screws clockwise (CW) to increase the gap, or counterclockwise (CCW) to decrease the gap. Figure 7-11 The height adjusting screws NOTE: Each rotation of the screw increases or decreases the gap by 0.7 mm (0.03 inch). NOTE: Be sure to loosen the fixing nut before making adjustments, and then tighten it. ADF skew adjustment If the ADF unit is not properly aligned on the flatbed, a scanned image skew might occur from the ADF front optics. If an image skew occurs, check the amount of ADF skew and adjust it within specifications. 1. Make a copy in the ADF simplex mode by loading a test page face down in the ADF input tray. TIP: Use a sheet of paper that allows you to measure at least 257 mm (10.1 inches). 2. Measure the L1 distance and the L2 distance with a ruler. If the difference between the two distances is equal to or less than 1.5 mm (0.06 inch), the skew is within the ADF skew adjustment specifications. Figure 7-12 The distance to measure Rear L2 Feed direction L1 Front I L1-L2 I 1.5mm 346 Chapter 7 Solve problems ENWW
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