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
SOURCE: error message UO51
Are you using official Cannon cartridges or "ink refill" cartridges? Did you reset your ink levels in the software?
SOURCE: Printer won't recognise cartridges UO51
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
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