HP 21 Black (C9351A)



COMPATIBLE WITH


  • DeskJet 3910
  • DeskJet 3915
  • DeskJet 3918
  • DeskJet 3920
  • DeskJet 3930
  • DeskJet 3938
  • DeskJet 3940
  • DeskJet D1311
  • DeskJet D1320
  • DeskJet D1330
  • DeskJet D1341
  • DeskJet D1360
  • DeskJet D1368
  • DeskJet D1420
  • DeskJet D1430
  • DeskJet D1445
  • DeskJet D1455
  • DeskJet D1460
  • DeskJet D1470
  • DeskJet D1530
  • DeskJet D1560
  • DeskJet D2320
  • DeskJet D2330
  • DeskJet D2345
  • DeskJet D2360
  • DeskJet D2368
  • DeskJet D2430
  • DeskJet D2460
  • DeskJet F2110
  • DeskJet F2120
  • DeskJet F2128
  • DeskJet F2180
  • DeskJet F2185
  • DeskJet F2187
  • DeskJet F2188
  • DeskJet F2280
  • DeskJet F2290
  • DeskJet F325
  • DeskJet F335
  • DeskJet F340
  • DeskJet F350
  • DeskJet F370
  • DeskJet F375
  • DeskJet F380
  • DeskJet F388
  • DeskJet F390
  • DeskJet F4135
  • DeskJet F4140
  • DeskJet F4150
  • DeskJet F4172
  • DeskJet F4180
  • DeskJet F4185
  • DeskJet F4190
  • Fax 1250
  • Fax 3180
  • OfficeJet 4311
  • OfficeJet 4312
  • OfficeJet 4314
  • OfficeJet 4315
  • OfficeJet 4317
  • OfficeJet 4319
  • OfficeJet 4352
  • OfficeJet 4355
  • OfficeJet 4357
  • OfficeJet 4359
  • OfficeJet J3608
  • OfficeJet J3640
  • OfficeJet J3650
  • OfficeJet J3680
  • PSC 1401
  • PSC 1402
  • PSC 1403
  • PSC 1406
  • PSC 1408
  • PSC 1410
  • PSC 1417

Troubleshooting - Click each question for details


Your cartridge is not actually empty. It has been remanufactured and the ink levels cannot be reset. Continue printing as normal until the print quality deteriorates.

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The working parts of the printer and cartridge are delicate and need to be in the correct condition to function correctly. Sometimes a little dirt or ink can prevent the cartridge from working. Remove the cartridge from the printer and gently clean the gold coloured electrical contacts on the cartridge and the contacts on your printer with some moist tissue. Reinstall the cartridge and attempt to print again.

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There may be air trapped in your cartridge’s printhead. Please run a cleaning cycle according to your printer’s instructions and try to print again.

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There may be a small blockage in your cartridge’s printhead. Remove the cartridge and try wiping the printhead from back to front a few times with a moist tissue. You should soon see a black line or a three colour line on the tissue. Reinstall the cartridge and attempt to print again.

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First check to make sure that you have removed the clip and/or tape from the cartridge before attempting installation. If you have, then make sure that your printer is listed in the ‘Compatible With’ section.

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In a effort to reduce the use of plastics, we have developed a new way of containing and protecting your cartridge that does not require a clip. Simply pull away the single piece of tape from the side and bottom of the cartridge and insert into your printer as normal.

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Printer manufacturers often use the roll out of their printer firmware updates to prevent you from choosing the origin and type of supplies you use in your printer. This has been done is ways such as blocking the use of remanufactured/recycled cartridges entirely, applying a 'cartridge lock' system that locks a cartridge's usage to a printer and introducing a new 'generation' of the same cartridge model to stop older, remanufactured cartridges being re-used.

Most printer manufacturers will prefer you to set your printer to automatically download and install their updates for this very reason. We suggest that you disable the automatic update option to allow you to continue to use remanufactured cartridges and also to recycle your cartridge after it has been used. By allowing your printer to update the firmware automatically you are risking being locked into only using the more expensive and less environmentally friendly original branded cartridges.

So we highly recommend switching off your printer's firmware automatic updates and dismissing future messages asking you to update your printer. These steps are a general guide to how to stop the updates, but please note that they will vary slightly depending on your exact printer model.

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This is true for both original and remanufactured HP cartridges. The page yield displayed by HP is based on a 5% page coverage life test. That is, if you only fill 5% of your page, your cartridge will print for the given number of pages. If you print photos, graphics or even a full page of text, you will be using more than a 5% page coverage. So with normal everyday printing, the page yield listed by HP is unlikely to be the same page yield that you will get out of your cartridge.

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