All of a sudden my canon pixma 500 displayed a message that the pink "ink tank can not be recognized". I tried to change out the tank but the message is still there. Both tanks were full. What can I do? Thanks
Carefully remove the tanks from the print head cartridge. use a q-tip lightly soaked in isopropyl alcohol, or use a q-tip paired with an alcohol prep pad from a first aid kit.
gently rub the rubber seating areas for each tank, removing the dried ink from the rubber seat. swab the soaked q-tip, or use the q-tip to gently press the alcohol prep pad into the rubber stopper. use a different spot on the q-tip or pad for each one.
check the print head for ink stains on the black plastic, clean those as well.
Use canned air to dry the stoppers, replace the tanks, and check status. Print a test page and check results.
If you do not print many items, you can avoid the situation by printing a test page every once in a while to keep the contacts clear. Also, run the program to clean the print heads occasionally, and always turn the printer power off at the printer (that seats the tanks down on the stopper, helping to prevent the contact getting plugged by dry ink.
I had the same problem with my black tank on an MP500. I changed the tank and the problem went away. In my situation the problem showed up after using half of the ink. I will send this tank back to Canon since it does not appear to be a printer problem. The instructions say to be careful not to touch the electrical contacts on the small circuit board when opening the tank packaging. There appears to be a chip on the back side of the circuit board, maybe touching the contacts can kill the chip?
Canon online help says to remove the tank and make sure the orange tape has been properly removed, leaving an "L" shape and a notch just above the number 8 on the edge of the tank. Check yours, but mine was fine and is still not recognized. My model is IP4200.
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Hello, this is what your error means: Ink tank not recognized 
A non-supported ink tank is installed (the ink tank LED is turned off). Install the supported ink tanks, check that the chips on the cartridges are clean.
Ok my printer is giving me the U140 message saying that ink tank cannot be recognized. The new ink tank is Cannon (not a off brand or refill). i think it is a problem with the chip reader port inside the printer not the ink tank chip. I feel this way because if you switch around the yellow and black 8 tanks, the printer accepts them without error.. soo if it was the ink cartridge i could be able to swap the black with the magenta and it should read it.
I had the same problem. My mp630 is also only 4 months old. I replaced all colour ink cartrdiges(inc black), but was only able to release the function for detecting the ink levels for magenta and cyan. Yellow and black then started giving error message U043, with them alternating between working, but never working at the same time. Getting them all clicked in with the lights glowing red does not solve the problem, as once the printer cover is closed, the same error message turns up. The only thing that worked for me is moving the chip slightly out of alignment, by pushing the sliding chip holder, and I only had to do this twice before they all started working and the printer was unlocked.
Try to open and close the main cover a bit, ... ink recognition will start and may solve the probleme ...
... otherwise remove the cartridge and clean the chip contacts e.g. with spirit
Maybe also pressing the stop/reset-button for >10s will also help to continue printing, but in this case the fill level of the cartridge will no longer be shown
Same problem - two solutions I found helped me work out mine. One said contacts needed to be cleaned and it worked to use a Q-tip and alcohol or just click it in position several times until it recognizes the cartridge - this may work. Another said that they got it to work by installing a brand new cartridge - cool, but I have one full of ink it won't recognize. So I pulled the little circuit board off a used cartridge (like you need to do with some refills) and put it on the cartridge that it wouldn't recogrnize - works great. Still haven't figured out how to get it to acknowledge ink levels though. Canon really should be more consumer friendly since these problems seem to be intended to compel the use of proprietary cartridges.
I have a canon mp510 pixma same message U043 and a u150 fault. I cant see any chip to replace and have replaced my original cartridges with a non branded cheaper type, this might be why. Does this make a difference or is this the same problem occurring with replacement canon cartridges as well.
Dont want to buy genuine ones if its not going to make any difference.