OfficeJet 6500: Print head cleaning Cycle - why not choose a color?

I'm having a problem with a single color (magenta) print does not correctly. I've had problems before with black. Why the prinhead cleaning cycle does not allow the selection of a single color for cleaning? Why should I lose the other colors of ink when there is only one that needs to be cleaned? I know that HP wants to sell ink, but be reasonable! That I had problems that appear only after you HAVE installed a new ink tank. And it has not shown using a cartridge to power after best-use-by-date. My guess is that if the ink cartridges are not stored properly the use-by-date means nothing.

There are a few components of the automatic cleaning cycles.  There are a set of wiper rubber that moved across the printhead to wipe or scrape debris from the print head.  All wiping little ink is spit of each nozzle to lubricate the wiper and help clear the clogged nozzles. The wiper is built on a unique sled with a motor that moves the wipers back and forth.  Allowing single color cleaning would require a much more complicated mechanical system, with four distinct and motors wipers to control.  (The wipers should be dedicated for each color.  She would cause the nozzle clogging if the black ink is allowed to mix with the color and would cause if different colors used the same color mixing wiper.)

Similarly, for your Officejet 6500, there is a pump system for a more energetic cleaning or for initial priming of printhead.  If it was designed for a single use of color, then a more complicated system, with four independent pumps and controls.

A Mater of reliability and economics, it is not practical to have separated in level printers cleaning cycles.

Tags: HP Printers

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