Black ink cartridge is full, when printing no black showing

It seems print head clogged,this issue not related with cartridge, perform clean print heads 3-4 times & chk, if no result replace the print head (CN642A).. I won't suggest for manual cleaning for this print head unit.. Thanks for listening me..

Simple problem that print head cleaning will typically not fix. The black ink is pigment based so it tends to form more stubborn clogs. Just remove the print head and if you have a steamer hit the black printhead nozzles with some pressured steam. If not available, soak the surface of the printhead in shallow hot water (try not to get the contact wet or be sure to dry them if you do). You can tell if the printhead nozzles are open by folding a section of wet paper towel like 5-10 layers and then soak it, press the printhead surface up and down lightly on the wet paper towel and if the nozzles are open you will see some ink pulse in the black port screen (the colors will also pulse from the pressure of the liquid under the printhead). It's easier than it sounds so give it a try. I've saved 100s of Canon printheads this way.

Note: if you have a really dried out head, you sometimes have to soak from the top inlet ports and the bottom nozzle surface to clear, but unlikely in you case since you had a black cartridge installed with ink in it (this keeps the top port from drying).

Have you taken the protective film/sticker off the cartridge? - so the ink can get out...

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..

Canon PIXMA MX850 Multi Function Printer Printer Canon MX850 will not print from... Answer Canon MX850 will not print from small Black Ink Cartridge - 8BK. It only uses the large black ink... (More) Canon MX850 will not print from small Black Ink Cartridge - 8BK. It only uses the large black ink cartridge and I have a drawer full of small 8BK cartridges. How can I get it to use the small black cartridge and not the large black cartridge? Thanks

Perhaps the printer does not recognize that a mono/black cartridge is installed. Remove the mono cartridge and check to see that tape is removed then re-seat firmly. Unplug the printer from wall power to reset. Then try again.

Dear it is problem black nozel is dry ink jum please wash it then solve your problem

Did you try to wipe the cartridge.Maybe there's a clogs. inside.

It is a little known fact that ink cartridges do have an expiry date, and it is sometimes possible that even if a printer reads full, that it has dried out and will not print. When you recieve a warning that your ink is too low you will simply be unable to print black ink after a certain point. Generaly if you want to print in only black you will have to do that when you print a document. For instance in IE when you go to file and then print you can select prefrences and select print in greyscale or black. hope this helps!

I have an Epson stylus 6000 series, second hand but was working just fine. I changed the ink cartridges and now the color won't print. Utilities shows all cartridges full, but only black and pale green-blue print. While it was printing color it was drinking the ink, but that's another story.

Yvonne