Question about HP Deskjet 6940 InkJet Printer

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Install cartridge missing on Deskjet 6940

Installed ink cartridge saying missing or not detected HP Photosmart c4250 all in one replaced the colour cartridge on an HP deskject 6940 (twice because I thought one was faulty). The black one works fine but I can not get the printer to find the colour cartridge (yes, I removed the plastic). After reading a similar issue, I used alcohol to clean the contact points but still no luck. Hate to throw out the machine but I can not put more time or money into it. Dave

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Please remove the cartridges from the printer. Take a dry lint free paper towel and gently wipe the contacts on the back of the cartridge (not the bottom from where ink is present). Wipe the contacts inside the printer (on cartridge carrier). Please snap the cartridges back into the cartridge carrier and please try to print a printer self test.

Posted on May 27, 2009

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Directions for inserting ink cartridges


Replacing the Ink Cartridges for Deskjet 6940 and 6980 ...

support.hp.com/us-en/document/c00569593
Selecting the correct print cartridge, and removing and installing print cartridges. ... Damage may occur to the HP Deskjet printer if the print cartridges are not docked ...print cartridges, or continue to the sections below for detailed instructions.

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Jan 16, 2016 | HP Office Equipment & Supplies

1 Answer

I have installed colour cartridge 351XL and black 350 cartridge but my printer still says Print cartridges missing or not detected


Have you removed the shipping tape from the print cartridge? It covers the print head on the cartridge to protect them so they won't leak ink.

Nov 01, 2010 | HP Photosmart C4280 Aio Printer

2 Answers

I have an HP Photosmart C5180.ink appears to be missing or damage


Hi there
Most times it just need a good clean ,take out and clean the brass conextions.
All the best Pineworks

Apr 27, 2010 | HP Photosmart C5180 All-In-One InkJet...

1 Answer

HPPhotosmart C4250 mgs "Printer Cartridge missing or not detected


There may be debris that is blocking the communication between the cartridge and the printer, especially if you are using a remanufactured cartridge. Remove the cartridge and unplug the printer from the power supply. Take a little bit of rubbing alcohol on a cotton swab and wipe off the contacts on the cartridge as well as the contacts inside of the printer. Allow both to dry for a few minutes before plugging the printer back in and re-installing the cartridge. This should clear up any miscommunication between the two.

Mar 15, 2010 | HP Photosmart C4280 Aio Printer

1 Answer

Photosmart C5280. Instructions on photo cartridge 348 say remove both black and colour cartridges, then install photo cartridge in right hand cartridge holder. Printer screen then tells me to install...


Your printer uses the following cartridges:

HP 74 - Black ink
HP 75 - Cyan, Magenta, and Yellow ink
HP 99 - Photo Black, Light Cyan, and Light Magenta

You need Photo Black, Cyan, Magenta, Yellow, Light Cyan, and Light Magenta to print photos. To accomplish this you install the HP 99 photo cartridge where your HP 74 black cartridge usually goes and you keep the HP 75 color cartridge where it's at. I don't know why your printer told you to remove both cartridges, then reinstall the HP 75 color cartridge.

Oct 10, 2009 | HP Photosmart C5280 InkJet Printer

1 Answer

The black ink cartridge has failed


It happens when that spring comes loose from the right side. When you get that hole, traces or wires in the ribbon cable are broken and you have to replace the entire carriage. Around $89.00

Aug 10, 2009 | HP Deskjet 6940 InkJet Printer

1 Answer

The black is printing dark redish brown


Dear friend, your Black Ink Cartridge is Empty thats why your printer is using the Colour Cartridge to produce the Black Colour. This is the reason you are having Dark Reddish Brown colour instead of Black.

Apr 08, 2009 | HP Deskjet 6940 InkJet Printer

1 Answer

I have a Deskjet 6940 printer and ive bought a HP348 photo colour ink cartridge. it wont fit in the slot!? Does it go in the colour slot?


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 .

Mar 28, 2009 | HP Deskjet 6940 InkJet Printer

1 Answer

HP Deskjet 6940 not printing after replacing ink cartridge


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

Sep 29, 2008 | HP Deskjet 6940 InkJet Printer

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