HP 3500cp Service Manual - Page 108

D12. Image Quality The purpose of this test is to verify the image quality attributes of the printer. Perform the Image Quality test as follows: Load media before performing this Test. 1 In the Diagnostics submenu, scroll to D12 Image Quality" and press Enter. Diagnostics D12 Image Quality 2 If media is not loaded the test will stop and the message Load Media to align Printheads" will be displayed on the frontĆpanel. Load media in order to continue the test. 3 The printer will print two printhead alignment patterns. During the printing, the message Aligning Printheads" will be displayed on the frontĆpanel. 4 If after aligning the Printheads the message Bad Printhead Alignment" is displayed on the frontĆpanel then try the following to solve the problem: 1 Try recovering the printheads using the frontĆpanel menu and try the test again. 2 If the test fails again, check the alignment pattern to check if any of the colors are printed badly. If a color is printing badly then replace the complete Ink Delivery System of the color that is bad. 3 The Line Sensor is not calibrated correctly. Perform the Line Sensor calibration ' page 5Ć9. 4 The lens cover, which is installed on the line sensor, is dirty. Replace the lens cover ' Users Guide, Chapter 10 (Lens Maintenance). 5 Check if the Line Sensor is installed and connected correctly. 6 Perform the Line Sensor Test ' page 4Ć9. 7 Perform the Electronics Test ' page 4Ć6. The test is continued on the next page. 4-24 HP DesignJet CP Series Printers Service Tests