HP C7769B Service Manual - Page 109

NOTE Service Calibrations Factory Advance Calibration The purpose of this Service Calibration is to calibrate the nominal advance of the media. This calibration is necessary to control the exact movement of the media in order to avoid print quality problems like banding. The values from the Calibration will then be stored in the EEROM and the user can restore the Printer to these values by selecting "Restore factory" in the Advance Calibration menu. Perform the Factory Advance Calibration whenever: n Banding is detected in prints for all HP Media standard paper types and Printheads Diagnostic is OK. n Drive Roller is disassembled or replaced. n Paper-Axis Motor Assembly is disassembled or replaced. n Electronics Module AND the Ink Supply Station are replaced. Perform the Factory Advance Calibration as follows: Make sure you load HP High Gloss Photo Paper or HP Bright White Inkjet Paper in to the Printer before performing this calibration. Do NOT use any other type of media apart from HP High Gloss Photo Paper or HP Bright White Inkjet Paper otherwise the Printer will display "Calibration Error" on the Front Panel and the calibration will be cancelled. 1 In the Service Calibrations submenu, scroll to "Factory advance cal." and press Enter. Service calibrations Align printheads Color calibration Advance calibration Factory advance cal. Menu Back Enter 2 When the following message appears on the front panel, select "Create pattern" and press Enter. Factory advance cal. Menu Create pattern Measure pattern Back Enter HP DesignJets 500 and 800 Series Printers Service Manual 5-11