Print Quality Troubleshooting Tool for HP Color LaserJet 3800

1. Print a copy of this Web page and walk over to the printer you are troubleshooting.
2. Enter DIAGNOSTIC MODE.
   1. Press the Menu button to enter the MENU on the control panel of the printer.
   2. Press the Down arrow button to highlight DIAGNOSTICS and then press the Select button.
   3. Press the Down arrow button to highlight DISABLE CARTRIDGE CHECK and then press the Select button.

3. Open the printer and swap the black cartridge with the magenta cartridge.

   

   (CAUTION! Do not place the cartridges on the transfer belt.)

4. Close the printer.
5. Print another set of PQ troubleshooting pages. Show me how.
6. Look at the lower right corner of the test pages number 2 and 4.
   Confirm that the test page number 2 is now black and the test page number 4 is now magenta.
   If this is not true, then you may have swapped the wrong cartridges.
7. As illustrated below if the white vertical line(s) now appear(s) on the black test page, replace the black cartridge with a new black cartridge.

                   
   
   Otherwise, contact HP.

8. Return the black cartridge to the black cartridge slot and the magenta cartridge to the magenta cartridge slot.

   

9. To exit this diagnostic test, press and then select EXIT DIAGNOSTICS.
   (CAUTION! Failure to exit Diagnostic mode will cause paper jams and other problems when using the printer.)