Technical information

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B. Check the 'WARRANTY ENDS' date on the PRINTHEADS*. If either are expired then they may

need to be replaced: For more information on this please visit:

http://h30434.www3.hp.com/t5/Ink-Toner-Cartridge-Printhead-Issues/Significance-of-quot-

Warranty-ends-quot-date-on-Officejet/td-p/1081607

C. If the above resolutions do not correct the issue, then replacement of the PRINTHEAD will likely

be required. As the refilled ink cartridge has nothing to do with the failure of the electronic

PRINTHEAD assembly, printhead replacement is not covered. All printheads will eventually fail

depending on printed content, usage and time via natural electronics degradation. The

Inkjet411 test labs have never observed a correlation between a refilled HP940 cartridge and

the failure of the HP940 PRINTHEAD assembly. We trust you clearly understand our position

with respect to this type of micro-electronics failure of a PRINTHEAD.*

D. We suggest you discuss the possibility of a refund with your local Costco (for the refilled

cartridge purchase).

NOTE: If you DO NOT observe a PRINTHEAD alert or error message, but instead observe substandard

print quality (or completely missing colors) and suspect the PRINTHEAD may be clogged, then you

may want to consider flushing the PRINTHEAD using an advanced 3

party procedure:

http://www.youtube.com/watch?v=y6YjL7mff5c&list=TLzK8FY3Lh_iA

*The HP940 ink-series printer models have two removable/replaceable electronic PRINTHEADS (each of

these electronic devices are responsible for pulling ink from the ink cartridges and then firing the ink

droplets onto the paper) – both PRINTHEADS will eventually fail in time depending on printed content,

printer duty cycle (i.e. typically rated for ~20,000+ printed pages depending on image content &

frequency of printing). While some printheads may last 15,000+ pages others may only last 1000 pages,

actual results will vary.

The printhead will eventually fail in time due to an internal micro-electronics failure, due to the

following leading factors: natural electronic components degradation from liquids corrosion over time ,

printer duty cycle (i.e. # pages printed per month), printing frequency (i.e. time between each print job),

print mode (i.e. draft vs. normal) and content printed (i.e. photos vs plain pages) and color mode (black

and white only vs. color/greyscale printing). Paper types used (i.e. plain paper, photo papers &

matte/heavy bond papers) and paper edge curl (due to age in printer or low relative humidity) can also

quickly lead to premature printhead failures due to physical ‘head strikes’ of the paper edges making

repeated contact with the printhead nozzle plate.

The average inkjet printer can typically be refilled with ~8 to 20 complete sets of ink cartridges over the

life of the printhead, after which, either the Yellow/Black and/or Cyan/Magenta printhead will

eventually need to be replaced (available at HP.com). Based on HP.com’s customer support forum, some