Technical information

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Cyan/Magenta or Yellow/Balck PRINTHEAD assembly. You may need to re-seat both PRINTHEAD(S) -

click here for instructions: http://inkjet411.com/?page_id=1457

NOTE: HP’s PRINTHEAD removal/replacement instructions can be found here:

http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?prodSeriesId=3752454&objectID

=c01623635

8) Ensure the cartridge actually has enough ink inside (there is an ink empty sensor in the base of the ink

cartridge). While ink tracking is not available when using refilled ink cartridges, when the cartridge gets

down to less than ~5% ink remaining, an 'out of ink' error condition will be communicated. If necessary,

return to your refiller and have them weigh it to ensure it was properly refilled.

9) If none of the suggestions above remedy the issue, then it is possible that the smart chip(s) on the

refilled ink cartridge(s) got somehow electrically damaged, thus rendering them useless (i.e. what we

generally refer to as physical damage). It is suggested to replace suspect ink cartridges with brand new

HP Genuine 940/940XL ink cartridges (i.e. original) and retest.

10) For more severe cartridge error messages which prevent printing [i.e. “The Following Printhead

Appears to be Missing or Damaged' or 'The Following Printhead has a Problem'] are usually caused by

failed micro-electronics within either of the PRINTHEAD assemblies (…which has nothing to do with the

HP 940 refilled ink cartridges since these are just plastic tanks that hold ink). The printhead assembly is a

separate electronic unit in which the cartridges plug into and feed ink to. Review HP.com PRINTHEAD

removal/replacement procedures to see if this is causing the issue or refer to the bottom half of this

page - you may need to re-seat both PRINTHEAD(S) - click here for instructions:

http://inkjet411.com/?page_id=1457

How the Printhead Works: http://inkjet411.com/?page_id=2054

11) 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

12) If this does not remedy the problem, then you may have a defective PRINTHEAD in the printer (worst

case scenario), unrelated to the refilled cartridges. Refer to HP.com for troubleshooting support. It is

first suggested you remove either the Cyan/Magenta or Yellow/Black PRINTHEAD (depending on which

one may be causing the error condition) and thoroughly clean the electrical contacts. Reinstall and test.

In rare cases, re-priming or replacement of the PRINTHEAD will eventually be required.