Check cartridge uo51 keeps coming up and wont let me print

This is usually an error indicating that one or both of the cartridges are not being recognised and is usually accompanied by a message on the computer screen saying which one. Try cleaning the copper strip on the front of the cartridge (in front of the label on the side) and if that doesnt work it needs to be replaced

Try to resetting the ink cartridges and then removing power from the product for about a minute then plugging it back in. Once this is done check the ink levels...................

If you need any kind of technical assistance you can contact support cell at http://www.vtechsquad.com

Your pen nib is faulty, but you are filling the ink, it wont work right?.. Similarly print cartridge(s) are faulty, no use to refill it. Do this exercise:Remove both cartridges from the printer, switch on the printer see the cartridge missing status on panel, insert mono(Black) cartridge close the door see the panel massage, if it's detected no issue with mono cartridge,if not mono cartridge faulty. insert colour cartridge & see..find out replace it...

Try to reset the printer using this procedure.. might help. turn off the printer..press/hold the stop/reset button..press/hold power button..while holding power button, release the stop/reset button.. then press the stop/reset button twice..release power button..wait until the power button lights a steady/still green and says "idle"... open the cover...take out both catridges.. then turn off the printer. put back the cover then turn on...now put the catridges back.. and wait for 10 seconds then try to print... try this one.

Try to press and hold "resume" button for 5 seconds.If this not help the color cartridge may defective.

Remove the cartridge and put it in again.
If it has a reset button, push that.
If you have "refilled" your cartridge the answers will be different. Did you?

Hi there
You can try to reset the cartages this may do it Please call back let us know if it worked for you, PLEASE.


Power off printer
Hold down STOP/RESET button then Press and Hold down Power button
Keep Power button down and Release STOP/RESET button
Release power button
Push STOP/RESET button twice
Wait 20-30 seconds - our LED showed Idle
Push STOP/RESET button four times
Push Power button twice
Power off
Next time the printer is started the waste count will have been reset.

Please come back and just gave a vote, it will gave me some satisfaction to know am helping some one so I will keep on helping.
All The Best: Pineworks

check this out: http://www.fixya.com/support/t257090-refilled_cartridge_not_recognised

This has been just happening with me aswell - I just changed the colour cartridge with the black cartridge ran out but i kept it in as it told me to place one in. Trying to print out but black ink wont come - just blank pages - surely the colour cartridge can make black? However, if you have the colour cartridge and are on microsoft word or similar, change the colour of the writing to dark navy and it will print out documents.

Are you using official Cannon cartridges or "ink refill" cartridges? Did you reset your ink levels in the software?