HP Deskjet 3420 Color Inkjet Printer - Manual (Page 45)

automatically cleaning print cartridges
If your printed pages are missing lines or dots, or if they contain ink streaks, the print
cartridges need to be cleaned.
Follow the steps below to clean the print cartridges automatically:
1. Go to printer maintenance .
2. Click the clean cartridges button.
3. Click clean , then follow the onscreen directions.
If your printouts are still missing lines or dots after cleaning, one of the print
cartridges may be low on ink.
If ink streaks still appear on your printouts after cleaning, the print cartridges and
cradle may need to be cleaned manually.
Caution! Clean print cartridges only when it is necessary. Unnecessary cleaning wastes
ink and shortens the life of the cartridge.
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