The black is printing dark redish brown

Hello,

1. Check if the printer has colored ink.
2. Check the settings. Make sure that the colored ink is activated.
3. Update the driver for your printer. Scan your computer with RadarSync.

Let me know if you have any questions.

David

Ink cartridge has a plastic seal protector that has to be removes prior to installation in compartment. Ascertain that the seals are removed from color ink cartridge. Also, ensure that the device is firmly straped in place to achieve print.

The single red ink drop is blinking and printer is not printing.
Do I have to replace both cartridges, earlier, only replaced the b/w.
Did not notice print getting dim before this happened.

you may have a bad print cartridge or it has gone bad...

I’m happy to assist further over the phone at https://www.6ya.com/expert/norman_d2fa496dce30c65d

On Windows XP I could see the ink levels however now on Windows 7 there is no way to see ink levels or to clean the print heads. I have to use my iMac to see ink levels and clean the print heads.

Your printer doesnt support HP348 cartridge.
HP 99 Photo is the cartridge meant for 6940 which wud go in the slot for black cartridge. and you can print approx 130 photos .

defective carriage. machine is brokeded (pronounced BROKE-DEAD). part unavailable, cannot be fixed, if machine is still under warranty then either take it back where you bought it or contact HP for replacement.

My HP Deskjet 6940 is not printing. The color (left) low ink light is dark and the black (right) low ink light is flashing. I replaced the black ink cartridge with a new one but the low ink light continues to flash. No tears/rips in the circuit strip and all the copper leads appear to be connected

I have the same issue, but with a HP DJ 3550, I´ve heard about the data execution protection (DEP) migth help when changing the options, but still have to try it

The Deskjet 6940 will only show ink level for original HP cartrdgies. Refilled or reman cartridges will show as empty or unknown in the toolbox. This is not an issue with the driver, the cartrdige itself has information that it has been previously used and this is not resettable. You can continue to print with a cartrdige that has unknown ink levels, you will just not get low ink warnings.

Regards,
Bob Headrick, Micosoft MVP Printing/Imaging