HP (Hewlett-Packard) C4591A Printer User Manual


 
H P D e s k J e t 6 9 0 C S e r i e s P r i n t e r s C l e a r i n g C l o g g e d N o z z l e s
Clearing Clogged Nozzles
If rows of dots are missing, the print cartridge contains ink, and print
cartridge cleaning procedure did not solve the problem, the print cartridge
may have clogged nozzles. Replace the print cartridge.