Canon MP600 error code U043

Make sure you've removed the protective tape from the cartridges that you inserted into the printer and that the cartridges were installed properly. Are you getting an error message or is the printer just not printing? If you get an error such as Error U041 or U043, the printer may just be low on ink or have a bad ink cartridge.

Possibly the chip!! Not working or does not at all register. Try another cartridge.....
Iceman.

The problem seems from your new cyan cartridge.
It doesnt print cyan ink.
Try to clean print head and test print for each color
from the utility menu

You can't turn it off...you may have a defective cartridge, a bent pin in the carriage assembly, or a generic cartridge that hasn't been reset properly.

Either it doesn't like the cartridges you are putting in, or another one is empty, whichever one has the led blinking or off is the one you need to replace

YOU CANT PRINT WITHOUT ANY ONE CATRIDGE.

YOUMAY TRY BY SETTING YOUR CATRIDGE TO MONOCHROME MODE IN PRINTER CATRIDGE SETTINGS

The U043 error code indicates that an ink tank is not installed. One or more ink tank icons on the LCD should also be lit up. The lit up icon indicates the applicable ink tank. Verify these tanks are indeed fully seated in the print head and that they are lit up red.

You can also press the OK button to clear this message and continue.

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.

Fiend your solution direct from Canon. Here is your solution...



http://www.canon.com/printer/prob676ijt65/solution
11111111

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.