General Troubleshooting 3 The Line Sensor is not calibrated correctly. Perform the Line Sensor Calibration ⇒ Page 4-15 . 4 The Line Sensor is damaged or faulty. Replace the Line Sensor ⇒ Page 6- 128 . Problems with Color Accuracy 1 The Color Sensor ESP (spectrophotometer) is a powerful tool unique to the Z series printers to maintain color accuracy. If you notice any problems with colors, perform the Color Sensor ESP (spectrophotometer) calibration. Refer to Page 4-18 .
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 Printhead crash, thus causing many media jam failures to be reported as head crashes. 1 Did the media jam occur when loading media? „ 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. When clearing a media jam, sometimes media is stuck in the paper path. To clear this, you must lift the Media Lever and insert thicker media into the paper path to push out the media that is still stuck there.
2 Is the customer using non-HP media? „ The use of non-HP 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 is now solved. 3 Has media been loaded without skew check? „ Loading media without skew check can cause printhead crashes both during loading and while printing. Whenever automatic skew check is available for a media type, it should be used.
If automatic skew check is not allowed for the media type, manually check that the media is correctly positioned. „ Standard/Normal Cut Sheets, depending on the degree of skew, cause printhead crashes when the corners are not evenly controlled (they are not pinched at the same time). This makes it more likely that the paper will be bent or damaged. Frequently, the paper curls upward when the paper expands due to ink absorption. „ Commercial FA Arts Sheets have the same problem as the Standard/ Normal Cut Sheets described above. The difference is that the Commercial FA Arts Sheets have a weak, irregular edge that often makes the problem worse.
„ Hand-cut Rollsheets or Leftovers are not supported by the printers because errors are frequently made by the operator that cause printhead crashes. Designjet Z Series — Service Manual 1-7