HP LaserJet M9040/M9050 Service Manual - Page 354

ADF calibrations Left side front calibration NOTE: Before beginning the left side front calibration, perform the tray registration calibration on the print engine. Touch Administration, then touch Print Quality, then touch Set Registration, then touch Source, and then select a source. Touch Test Page, and then touch Print. Follow the instructions on the printed registration page to complete the registration setting. Repeat this procedure for all trays. 1. Download the calibration target and the calibration values chart. Calibration targets are available at the HP service information Web site. 2. On the product to be calibrated, print the calibration target on ledger or A3 paper. 3. Print two copies of the calibration values chart on ledger or A3 paper. 4. On the calibration target page, extend the wide line (callout 1) on the top, left corner and the wide line on the top, right corner (callout 2) to the edge of the paper. Figure 7-5 Extend the wide lines to the edges of the page, and add lines 1 mm to the inside of the right and left edges. 1 2 5. Using a straight edge, draw a line 1 mm (0.04 in) in from the top left edge of the page (callout 1) and from the top right edge of the page (callout 2). Make the lines approximately 30 mm (1.2 in) long. 6. Load the calibration target face down, and copy it using the ADF front-side optical unit. 7. Align the edge of the thick, black lines on the copy to the lines drawn 1 mm (0.04 in) from each edge on the original calibration target. NOTE: Be sure you can see white on both sides of the calibration target. If not, you cannot perform the necessary measurements. 336 Chapter 7 Solve problems ENWW