Question about Canon Pixma MP500 All-In-One InkJet Printer

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Canon MP500 error message

I keep getting this error message on my Canon MP500: "UO71 More than one ink tank of the following color is installed, BK".

There is not the same color installed and I have replaced the one blk cartride just in case with no results.

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If you're using Canon OEM (branded) cartridges you're going to need to ID the problem chip/cartridge so I'd try and get hold of some empty originals from somewhere (CartridgeWorld or similar perhaps?) and put those in as replacements for one cartridge at a time until you ID the problem cartridge/chip

If they're non-branded then chances are you do have more than one of the same chip but the solution is much the same...


If all else fails, take the printer to a friendly retailer who sell Canons and ask them to help you ID the problem cartridge.

Posted on Jan 23, 2009

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1 Answer

UO43 error there is no ink cartridge there, but when there is an ink catridge UO71 it says more than one ink cartridge


Hi there

For troubleshooting purposes,
Perform the following:

1. Open the printer and remove all ink tanks.

2. Insert a single ink tank in the printer then close the cover.

3. Confirm whether the printer recognizes the installed tank
properly. If it does, it will indicate it does not detect the other ink tanks, as
they are not currently installed in the printer.

4. Repeat steps 1-3 with another ink tank.

5. If the printer at any time indicates two of the same ink tanks are
installed, the cause will be the last tank installed. For example, if
you inserted an ink tank earlier, and you later inserted another ink
tank, and it said two of the same inks were installed, the cause of
the issue is the last ink tank.



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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I am also getting this error message. For a few days I could take out the offending cartridge and the printer would forget for one printing and then go back to telling me that two of the same cartridges were installed. HELP! I am about to chuck it out the window, though I believe CANON should send us all new ones.

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