A new maintenance cartridge is incorrectly detected as ‘used’ This can occur if the printer has detected the previous Maintenance Cartridge was nearly full, and when a new Maintenance Cartridge is installed the front panel displays an error that the cartridge is ‘used’. To resolve the problem, manually reset the counter of the Maintenance Cartridge Reset Life Counters on page 116 . Cover sensors are not working To resolve cover sensor problems, do the following: 1. Check whether the sensor cable is damaged or not connected correctly. 2. Replace the faulty sensor. The Line Sensor has problems detecting paper To resolve Line Sensor paper detection problems, do the following: 1.
Check the type of paper that is being used: the Line sensor may have problems detecting transparent paper or some types of Non-HP paper. Try loading white HP paper into the printer and check whether the Line Sensor detects it. 2. Excessive ink deposits on the Platen surface can fool the sensor by reflecting the light. Clean the Print Platen. 3. Clean the Encoder Strip See Clean the Encoder Strip on page 450 . 4. The Line Sensor is not calibrated correctly. Perform the Line Sensor Calibration See Line Sensor calibration on page 139 . 5. The Line Sensor is damaged or faulty. Replace the Line Sensor See Line Sensor Assembly on page 379 . Troubleshooting paper jams and printhead crashes NOTE:
If you were using HP Coated Paper when the problem occurred, see also Printhead crashes/smears on high-density prints using coated paper on page 13 . Paper jams and printhead crashes 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, which means that many paper jams are reported as printhead crashes. 10 Chapter 1 Troubleshooting ENWW