I have error U071. I have been refilling the PGBK5 tank with black dye not pigment black for ages. I suspect that it may be because I have not been refilling it with pigment black. The LCD says that I have "more than one ink tank of the following color installed" The diagram indicates the large tank and calls it BK ( not PGBK).It appears that the only solution is to buy a new Canon tank. However, I am concerned that it still won't work. Does anyone have a genuine fix?
You will need to get a new(er) print cartridge and replace the old one to eliminate the problem.
I have experienced the same problem after refilling the ink cartridge for several applications. I suspect that if the printer can not properly ID the tank levels or read the "chip" connected to the cartridge...then it is time to change it out to a different or new cartridge. That is the remedy that has worked for me.
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The way the chips work is a light is emitted from the LED on the rear of the chip and it shines through the cartridge prism. When you start your printer the cartridges swing over the left and an optical sensor picks up the light from the cartridges. There are a number of things that can effect the sensor, such as having the lid open or a dirty sensor. Or in my case ink splattered on the prism.
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