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What causes the 'Remove and check color cartridge' message?

What conditions give rise to the message "Remove and check color cartridge" on the screen of my HP T45 OfficeJet Printer/Scanner/FAX machine?  I.e., what sensors are being monitored by the printer's software?
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nobus
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it should be the ink level sensor in the cartridge
Remember to check the contacts, both on the printer side and on the cartridge. Broken, missing or dirty contacts will results in all sorts of different error messages, as the software will not be able to query the cartridge status correctly.

Edan
Try cleaning the contacts on both the cartidge and the carriage. Use warm distilled water and cotton swab. Distilled water gets rid of the pesky minierals that don't need to be on your contacts.

Are these new cartridges of refilled/refurbished?  There are also sensors internal to the cartridge to determine fluid level, for obvious reasons can't be checked. These may stop functioning properly after sitting for a time as the ink dries and does not dissolve. giving the indication ink at the top and bottom of the cartidge and nothing in the middle. Shake the cartidge vigorously  to over come the baffles. This may help clear the "clog" at the sensors.
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Watzman

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freedml

I have done all you suggested and and put a new HP cartridge in and I still get the message every couple of days on my HP 5510xi.  Opening and closing the door clears the message and it prints normally for another day or two.  Any other suggestions other than replacing the unit?
If you have not done so, I'd call HP.  It sounds like dirty contacts, but you have cleaned them.  The contact block could be defective.
Eureka!!!!  I have stumbled onto the answer.

After a number of weeks of this happening and several troubleshooting sessions with HP techs, one additional solution for 'Remove and check the color cartridge' is .....  drumroll .... change the BLACK cartridge.  Silly me, I changed the color cartridge and got upset when it didn't make any difference.  Then, the black cartridge totally ran out of ink, so I changed it, and the problem is gone.