NOTE: Remember that certain Calibrations are required even if an Assembly has been disassembled to gain access to another Assembly or Component. Solving scan/print-quality problems Refer to the Image Quality Troubleshooting Guide (in the EWS-Support Tab or in the CD). The Touch Control Panel is blank See What to do if the Touch Control Panel is blank on page 36 . The product does not power on See What to do if the Touch Control Panel is blank on page 36 . The product continuously rejects printheads ▲ Clean the flex contacts on the Printhead and in the Carriage Assembly using the Carriage Interconnect Wiper and try again. Cover sensors are not working 1. Perform the Sensors Test.
See Sensors Test on page 100 . 2. Check that the cable for the faulty sensor is not damaged and is connected correctly. 3. Replace the faulty Sensor. The line sensor has problems detecting paper 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 product 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 168 . 3. The Line Sensor is damaged or faulty. Replace the Line Sensor. See Line Sensor on page 329 .
Troubleshooting Printer 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. 10 Chapter 1 Troubleshooting ENWW