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Purging The Nozzles - HP C Maintenance Manual

Disposable cartridge
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Figure 4: Direction of Wiping for the HP51640(A,C,M,Y)
In all three wiping configurations the printhead should be pointing down while it
is being wiped. This position will prevent the nozzles from pulling little bubbles
into the firing chambers.
Applying heavy pressure is not necessary to clean the particles off of the
printhead. A large pressure can actually cause particles to scratch the printhead.
Scratches can cause the nozzles to fire in improper directions adversely affecting
print quality. It is very important to always be gentle when cleaning the
printhead.
It is also important to keep the electrical interconnects of the printhead clean.
The interconnect pads can be cleaned with:
Moist cotton TexWipe
Moist Q-Tip
The interconnects should not be cleaned with:
Watch Out!
It is important to make sure that this section of the cartridge is dry before it is re-
inserted into the printer to eliminate the chance of an electrical short in the
cartridge or permanent printer damage.

3.3 Purging the Nozzles

If the printhead sits inactive for a period of time, ink may dry in the nozzles.
Printing may not remove these "ink plugs" from the nozzles. White streaks will
then show up in the printed text or graphic. In order to obtain better print quality,
this ink plug needs to be forced out or purged. The printhead should first be
wiped with a wet cloth. Some machines offer purging or servicing functions that
may remove these ink plugs if wiping alone does not cure the problem. If a
machine does not have this capability, most ink plugs can be removed by printing
a few lines of text or graphics in a high resolution. The higher resolutions (600
dots per inch, for example) exercise more nozzles and push more ink out. This
purging operation as well as wiping the printhead with a wet cloth should be done
after every extended period of down time in order to prevent unacceptable levels
of print quality.
An example start -up procedure might include:
Pencil eraser (A common misconception is that the interconnects can
be cleaned with the eraser of a pencil. The eraser actually damages the
interconnect and will decrease the life of the cartridge.)
Wipe the print cartridge with a moist cloth as described in the wiping
section of this document
Perform a purge algorithm or print a few lines of text in a higher
resolution (600x600dpi, for example)
Wipe the print cartridge with a moist cloth again as described in the
wiping section of this document
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