HP Deskjet 5650 - Manual (Page 136)

automatically cleaning print cartridges
If your printed pages are missing lines or dots, or if they contain ink streaks, the print
cartridges may be low on ink or may need to be cleaned.
Click here to check the print cartridge ink levels.
If the print cartridges are not low on ink, follow these steps to clean the print cartridges
automatically:
1. Go to printer maintenance .
2. Click Clean Cartridges .
3. Click Clean , then follow the onscreen instructions.
If your printouts are still missing lines or dots after cleaning, replace the print cartridges.
Caution! Clean print cartridges only when it is necessary. Unnecessary
cleaning wastes ink and shortens the life of the cartridge.