HP Officejet Pro K850dn Printer - Manual (Page 91)

Check ink cartridges
Make sure ink cartridges have not been tampered with. Refilling processes and the use of
incompatible inks can disrupt the intricate printing system and result in reduced print quality and
damage to the printer. HP does not guarantee or support refilled ink cartridges. For ordering
information, see
HP supplies and accessories .
Colors do not line up properly
Check printheads
The printheads are not automatically aligned when a printhead is replaced. However, you might
notice improvement in the print quality by performing the alignment procedure yourself. See
Maintaining the printheads .
Check graphics placement
Use the zoom or print preview feature of your software to check for gaps in the placement of
graphics on the page.
Lines or dots are missing from text or graphics
The printheads or printhead contact pads might need cleaning. See Maintaining the printheads .
Resolving paper-feed problems
For information on resolving jams, see Clearing jams .
Media is not supported for the printer or tray
Use only media that is supported for the printer and the tray being used. See Understanding
specifications for supported media .
Media is not picked up from the tray
● Make sure the paper guides are set to the correct markings in the tray for the media size you are
loading. Also make sure the guides are snug, but not tight, against the stack.
● Make sure media in the tray is not curled. Uncurl paper by bending it in the opposite direction of
the curl. Also, check the ink saturation. To increase the ink drying time and reduce the ink
saturation, use an ink slider in conjunction with drying time under Advanced Printing Features
(Windows) or Ink Features (Mac OS) in the printer software. However, note that decreasing ink
saturation might give printouts a "washed-out" quality.
Media is not coming out correctly
● Make sure the output tray extension is extended, otherwise, printed pages might fall off the printer.
● Remove excess media from the output tray. There is a limit to the number of sheets the tray can
hold.
ENWW Troubleshooting 83