HP Deskjet 3420 Color Inkjet Printer - Manual (Page 62)

automatically cleaning print cartridges
If your printed pages are missing lines or dots or if streaks appear, the print
cartridges need to be cleaned.
Print cartridges are cleaned automatically using the following procedure:
1. Open the HP Inkjet Utility .
2. Select the Clean panel.
3. Click the Clean button, then follow the onscreen instructions.
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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