I have a cartridge error on my HP 6450. It says cartridge on left must be replaced. The ink level indicator still showed about half full.

Dear Jeannine,

Greeting!

Check estimated ink or toner levels for your printer to determine if you need to replace any cartridges.

NOTE: Ink level warnings and indicators provide estimates for planning purposes only. When an indicator shows low ink levels, consider having a replacement ink cartridge available to avoid possible printing delays. You do not need to replace ink cartridges until you are prompted to.

Many HP printers display ink and toner cartridge levels on the control panel. Look for an ink drop or cartridge icon or an Ink Levels menu to check the status of each cartridge.
Figure : Examples of ink and toner level icons and menu selections on various HP printer control panels

If your printer does not have an ink level icon or menu, continue with these steps to check ink or toner levels from your computer or mobile device.HP Customer Support - Software and Driver Downloads, enter your printer model, and then clickDownload next to the full feature driver or HP Easy Start to download and install the driver.

For the HP 940c, there is only one light to indicate a possible low ink cartridge. The LED above the cartridge symbol (the only one without a button) will flash. (Note: this LED is the second from the left.) When you see the error code, open the printer's top cover. If the error is a low ink issue, the LED will stop blinking.

With the cover open, the cartridge carrier will move until the yellow arrow lines up with an icon on the printer itself. These five icons are in order from left to right (as you look at the cartridges) : tri-color ink cartridge problem, black ink cartridge problem, tri-color ink low, black ink low and cartridges OK. If both cartridges are low, replace the one indicated by the arrow. Then the cartridge carrier will move to indicate the other cartridge is low. (If only one has a problem, after you replace it, the carrier will move to the cartridge OK symbol.)

If HP offers the full-feature software for your OS, then install the software. Use the HP Deskjet Toolbox to get exactly which cartridge needs to be replaced without needing to be ready to replace both (or to monitor your ink level (approximate ink level)).

The manual for the Deskjet 940c is available as a PDF from HP: http://h20000.www2.hp.com/bizsupport/TechSupport/DocumentIndex.jsp?contentType=SupportManual&lang=en&cc=us&docIndexId=64179&taskId=125&prodTypeId=18972&prodSeriesId=35985 .

I hope this helps.

Cindy Wells

AFTER REFILL PRINTER STAY IN ERROR CARTRIDGE BLINKING

There is a chip on your cartridge that communicates with the printer to estimate how much ink is left in the cartridge. When the chip thinks the cartridge is empty it will refuse to print any more pages no matter how much ink is left in the cartridge. These cartridges are only estimated to print "up to 840 4" x 6" photos, or 80 13" x 19" photos." If it showed half full yesterday and then you put through a large print job it is very likely the cartridge is empty. In any case once the chip thinks it's empty the cartridge needs to be replaced.

slowly off and on the printer for five times without cartridge, printer saves data of cart of last 5 only so next time it reads full ink..

keep the cartidge in Hot Water for 30 minutes. maybe it works.

Deskjet 5100 series

1. Click Start or , click All Programs , click Hewlett-Packard , and then click Printer Assistant .
2. Click Utilities .
3. Click View ink levels .
   • If a cartridge is low on ink, discontinue these steps, replace the cartridge, and then try printing again.
   • If the cartridges contain a sufficient amount of ink, continue to the next step.
4. Click Printer Maintenance .
5. Click Clean Cartridges .
6. Follow the on-screen instructions.

ISSUE: After installing a new HP Inkjet print cartridge, the ink level indicator remains at the previous level. SOLUTION: Continue to print and ignore the ink level indicator. The print cartridge is full of ink, it just is not being measured accurately.

Hello,

View the user manual here. http://bizsupport2.austin.hp.com/bc/docs/support/SupportManual/c00449611/c00449611.pdf

go to page 60 and follow the instructions for replacing the ink cartridge, remember to have the printer on when you do.

Then go to page 62 and allign the print head automaticly following the instructions it gives.

This will re-callibrate the ink level on the printer and should read correctly for you.

Thanks
CompuFirm

slowly off and on the printer for five times without cartridge, printer saves data of cart of last 5 only so next time it reads full ink..

The ink level indicator is only an estimate to give you an idea when it's time to buy a new cartridge. You cannot reset the ink level indicator so simply ignore it if you refill your cartridges. See pg 72 of the user manual which you can get here: http://h10032.www1.hp.com/ctg/Manual/c01374711.pdf