HP Officejet 6500 - Manual (Page 237)

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.
b. Use a fresh, lightly dampened, lint-free cloth to wipe any accumulated ink and
debris from the edge between the nozzles and the contacts.
c. Use a fresh, lightly dampened, lint-free cloth to wipe the plastic ramps on both
sides of the nozzles. Wipe away from the nozzles.
Errors 233