HP Photosmart C6340 All-in-One Printer - Manual (Page 284)

6. Clean the printhead.
There are three areas of the printhead that need to be cleaned: the plastic ramps
on both sides of the ink nozzles, the edge between the nozzles and the electrical
contacts, and the electrical contacts.
1 Plastic ramps on the sides of the nozzles
2 Edge between nozzles and contacts
3 Electrical contacts
CAUTION: Touch the nozzle and the electrical contact areas only with
cleaning materials and not with your finger.
To clean the printhead
a. Lightly dampen a clean, lint-free cloth and wipe the electrical contact area
from the bottom to the top. Do not go past the edge between the nozzles and
the electrical contacts. Clean until no new ink shows on the cloth.
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