The line sensor has problems detecting paper Troubleshooting 1. Check the type of paper that is being used since the Line sensor may have problems detecting transparent paper or some types of Non-HP paper. Try loading white HP paper in to the printer and check that the Line sensor detects it. 2. The Line Sensor is not calibrated correctly. Perform the Line Sensor Calibration. See Line Sensor Calibration on page 155 . 3. The Line Sensor is damaged or faulty. Replace the Line Sensor. See Line Sensor on page 296 .
Troubleshooting paper jams and printhead crashes The failure modes "paper jam" and "head crash" are grouped together because in many cases a paper jam causes the paper to lift up into the Carriage path and cause a Printhead crash, thus causing many paper jam failures to be reported as head crashes. 1. Did the paper jam occur when loading paper? ● If the client has had paper jams, it is common for pieces of paper to get stuck in the paper path. Clear the paper path. NOTE: When clearing a paper jam, sometimes paper is stuck in the paper path. To clear this, you must lift the Media Lever and insert thicker paper into the paper path to push out the paper that is still stuck there. 2.
Is the customer using non-HP paper? ● The use of non-HP paper can easily be the cause of paper jams and head crashes (especially head crashes because HP paper is specially formulated to avoid cockle, one of the primary causes of head crashes). If the paper is not HP approved, advise the customer to use HP paper and check to see whether the problem is now solved. Banding at variable extreme environmental conditions Since the Accuracy Calibration has been done at normal environmental conditions, printing in extreme environmental conditions will cause banding because the advance of the Media Advance Roller does not correspond to the same conditions that the calibration was done in.
To solve the problem, try the following: Perform the Accuracy Calibration in the new environmental conditions (Refer to the User’s Guide). Worm marks on HP Coated paper with light area fills Light bands (S-shaped) in Paper axis direction where light area fills are printed, causing unacceptable Image Quality defect. ● Print the Service Configuration Print and check whether the humidity level is very low (below 30%). Increasing humidity may help in reducing the severity of the problem. NOTE: The paper is causing the problem and not the printer. Do not attempt to try to replace printer parts to solve this problem. ENWW General troubleshooting 5