Technical information

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10. If problem persists after following all suggestions outlined above, then we suggest you discuss the
possibility of a refund with your local Costco (for the refilled cartridge purchase). We apologize for the
inconvenience this may have caused you.
* The HP 940 ink-series printer models have two 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 depending on printed content, printer duty cycle (i.e.
typically rated for ~15,000 printed pages depending on image content & frequency of printing, although
some printheads have reportedly reached end-of-life around 2,000 pages. Actual results will vary.). The
average inkjet printer can typically be refilled with ~8+ complete sets of ink cartridges over the life of the
printhead, after which, either the Yellow/Black and/or Cyan/Magenta printhead may need to be
replaced (available at HP.com). Refer to video on how the HP PRINTHEAD functions:
http://inkjet411.com/?page_id=2054
Please let us know if the problem persists and/or if you have any further questions on the technical
information provided.
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ADDITIONAL PRINTHEAD TECHNICAL NOTES:
When the PRINTHEAD electronically fails typically the printer will provide an alert message when this
happens, but if a printhead has suffered a deprime (i.e. loss of ink/pressure which results in no printing
of color), it is possible to recover the ink system using a 3rd party PRINTHEAD priming tool, such as this
one: http://www.inkowl.com/?p=product&product=5035
A PRINTHEAD "missing" / "damaged" / "problem" error has nothing to do with the HP940 refilled ink
cartridges since these are just plastic tanks which hold ink - all ink formulations have been fully tested
for compatibility with all HP printer systems. The timing of a printer/printhead failure is merely
coincidental with respect to the use of refilled ink cartridges. Each PRINTHEAD is a complex electronic
ink-firing assembly which sits directly behind the ink cartridges during the printer idle state; the
cartridges plug into and feed ink to both the Yellow/Black PRINTHEAD and Cyan/Magenta PRINTHEAD.
As the refilled ink cartridge has nothing to do with the failure of the electronic PRINTHEAD assembly,
printhead replacement cost 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 printer
PRINTHEAD assembly. We trust you clearly understand our position with respect to this type of micro -
electronics failure of a PRINTHEAD, should this turn out to be the root cause of failure.
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Please let us know if you have any further questions on the technical information provided. For any
additional questions please contact us directly: [e-mail]
-Thank you