HP Photosmart D5400 series - Manual (Page 182)

To clean the print head
a. Lightly dampen a cotton swab and wipe the electrical contact area from the
bottom to the top.
In order to avoid transferring ink and debris from the contact area to the
nozzles, do not go past the edge of the print head. Use an many fresh swabs
as necessary. Clean until no ink shows on the swab.
b. Lightly dampen a fresh swab and wipe the nozzle area.
Wipe in one direction only (do not wipe back and forth). In order to avoid
transferring ink and debris from the nozzle area to the contacts, do not go past
the edge of the print head.
NOTE: Use separate swabs for cleaning the different nozzles.
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