HP LaserJet M9040/M9050 Service Manual - Page 358
Leading edge back calibration, ADF plain scaling calibration
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Leading edge back calibration NOTE: Before beginning the leading edge back calibration, you must 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. Perform this procedure for all trays. 1. Download the MFP calibration target and the MFP 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. Load the calibration target face up, and choose "two-sided original to a one-sided copy" to eliminate any print engine duplexing issues. 5. Copy the calibration target using the ADF backside optical unit. 6. Align the top edge of the copied calibration target to the top edge of the original calibration target. TIP: Align the paper edges and not the lines. 7. On the calibration target, compare the line at the top edge of the original to the line at top edge of the copy. 8. Determine whether the copied page should to be shifted up or down and by what distance in millimeters. 9. Using the two calibration values charts, determine the value for the leading edge back to enter into the Service menu. ADF plain scaling calibration NOTE: Before beginning the ADF plain scaling 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. Perform this procedure for all trays. 1. Download the MFP calibration target and the MFP 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. Load the calibration target face down, and copy it using the ADF front-side optical unit. 5. Align the top line of the copied calibration target to the top line of the original calibration target. TIP: Be sure to align the lines and not the edges. 6. On the calibration target, compare the line at the bottom edge of the original to the line at bottom edge of the copy. 340 Chapter 7 Solve problems ENWW