Have had a MP810 about 3 months. Recently I've been getting a U150
error message. My C tank is not lighting up and being recognised. When
I open up and replace the tank the light comes on. Initially this
allowed me to carry on printing but now I have a constant error message
even after replacing the tank. Is there a permanent solution to this annoying problem? I would be grateful for any assistance.
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I have just read it on the other forum..try this one Error Code 5020: Scanner lock switch locked.  Release the scanner lock switch and turn the power off and back on. Turn the machine off, unlock the scanner lock switch, then turn the machine on again. Hope it helps.
I just replaced my MP810 printer head. Procedure: open printer - remove ink cartridges - Pick up arm located on right side of cartridge holder- remove printer head by picking up by the cartridge slots. Place new printer head in holder - replace printer cartridges - press arm down and your done....However, the error message stays on and reset procedure doesn't remove it. Canon tech support said their solution (because of distance from canon support) is to replace MP810 with comparable printer, which came to $299 with 15% discount and free shipping. My solution, I’m checking out other printers.
Got this same U150 error code( Ink Cartridge not recognized) tried reinstalling... no luck... got a new one... no luck.... now collecting dust after I completely disassembled my MP830, checked all connections and reassembled it... stil the same U150 error code....and a new HP 7280 is on its way.... if a fix comes up for this.... I will have it fixed.. GREAT all-in-one! This is the only problem I have ever had with it...
There was plenty of ink left in my Cyan tank but just replacing it with a new Canon CLI-8C one, as suggested by techguru005, did the job. I suppose that the chip must have been faulty? Let's see how long this one lasts! Thanks, techguru005, it's fixed for now.