HP 3500cp Service Manual - Page 22
The Mark Encoder, on the Drive Roller, is dirty. Clean the Mark Encoder - heads
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What can I do if the Cover Sensors aren't Working? 1 Check if the faulty sensor is installed correctly. 2 Check if the cable for the faulty sensor is connected correctly. 3 Replace the faulty Sensor. What can I do if the Switch Power Off / Check Printhead Path" message appears when the Printer is about to cut or is cutting? 1 Check the media path and clear it if necessary. 2 Perform the Cutter Test ' page 4Ć22. 3 Replace the Cutter Assembly ' page 8Ć48. What can I do if the Bail Assembly does not lower all the way? 1 Check that there are no obstructions in the way of the Bail Assembly. 2 Perform the Bail Test ' page 4Ć23. What can I do if the Lens Maintenance" message appears on the FrontĆPanel? 1 The Mark Encoder, on the Drive Roller, is dirty. Clean the Mark Encoder first before trying anything else. 2 The lens cover, which is installed on the line sensor, is dirty. Replace the lens cover ' Users Guide, Chapter 10 (Lens Maintenance). Troubleshooting Media Jams/Printhead Crashes The failure modes media jam" and head crash" are grouped together because in many cases a media jam causes the media to lift up into the carriage path and cause a head crash, thus causing many media jam failures to be reported as head crashes. 1 Did the media jam occur when loading media? D If the client has had media jams, it is common for pieces of media to get stuck in the media path. Clear the media path. 2 Is the customer using nonĆHP media? D The use of nonĆHP media can easily be the cause of media jams and head crashes (especially head crashes because HP media is specially formulated to avoid cockle, one of the primary causes of head crashes). If the media is not HP approved, advise the customer to use HP media and check to see if the problem now solved. 1-10 HP DesignJet CP Series Printers Troubleshooting