HP 8550 Service Manual - Page 143

Mechanical adjustments To adjust the ADF height The height of the ADF is adjusted by lengthening or shortening the left and right adjusting bolts (callout 1) so that the distance between the two rubber feet (callout 2) at the rear and the horizontal size plate (callout 3) on the copyboard glass (callout 4) is 0.2±0.1 mm (the thickness of two sheets of 64 g/m2 copy paper) when the ADF (callout 5) is closed, and the feet (callout 6) at the front are in contact with the copyboard glass. To adjust the ADF height, follow these steps: 1 Turn the copier off. 2 Remove the ADF to expose the adjusting bolts. (See "Removing the ADF" on page 378.) 2 25 26 27 23 24 21 Figure 32. Note Adjusting the ADF height 3 Loosen the lock nuts (callout 7) and turn the bolts of the left and right supports to raise and lower the ADF. After adjustment, tighten the nuts (callout 7) to lock them. 4 Replace the ADF and recheck the height. Repeat steps 2 and 3 as necessary. 5 After adjustment, check to make sure that both the left and right rubber feet at the front of the ADF are in contact with the copyboard glass. If not, adjust the height of the magnet at the front of the ADF. EN ADF adjustments 141