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- Print a copy of this Web page and walk over to the printer you are troubleshooting.
- Enter DIAGNOSTIC MODE.
- Press Menus to enter the MENUS on the control panel of the printer.
- Press
to highlight DIAGNOSTICS and press .
- Press
to highlight DISABLE CARTRIDGE CHECK and press .
- Open the printer and swap the magenta cartridge with the black cartridge.
(CAUTION! Do not place the cartridges on the transfer belt.)
- Close the printer.
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Print another set of PQ troubleshooting pages. Show me how.
- Look at the lower right corner of the test pages number 2 and 4.
Confirm that the test page number 4 is now magenta and the test number 2 page is now black.
If this is not true, then you may have swapped the wrong cartridges.
- As illustrated below if the white vertical line(s) now appear(s) on the magenta test page, replace the magenta cartridge with a new magenta cartridge.
![](/cpso-support-new/pq/4700/img/4700/swap_white_black_in_magenta.gif)
Otherwise, contact HP.
- Return the black cartridge to the black cartridge slot and the magenta cartridge to the magenta cartridge slot.
- 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.)
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