HP 8550 Service Manual - Page 150

4 Open the ADF slowly, and measure the stop position l4; then, close the ADF. The distance l4 should be 11.0 ± 1 mm, and the left edge of the page should align with the indicator arrow on the horizontal size plate. Figure 43. Note Measuring the copy paper stop position 5 To adjust the original-leading-edge stop position, use switches SW1 and SW2 on the DADF controller PCB. • Pressing switch SW1 shifts the original stop position to the right by 0.34 mm. • Pressing switch SW2 shifts the original stop position to the left by 0.34 mm. Holding down the push switch causes only a single shift. 6 Press switch SW3 one time to move the sheet off the glass back to the document tray and store the new setting. 7 Press switch SW3 again to place the sheet back on the copyboard glass. 8 Open the ADF slowly, and measure the copy paper stop position l4; then, close the ADF. The distance l4 should be 11.0 ± 1 mm, and the left edge of the page should align with the indicator arrow on the horizontal size plate. If necessary, adjust as described in step 5. 9 When no more adjustment is required, press switch SW3 to discharge the page and save the final stop position setting. 10 Return the DIP switches to the OFF position. 148 Chapter 4 - Adjustments and maintenance EN