The error code U075 will often occur when you are working on your Canon printer. Whether we talk about the Canon printers or any other printer, error codes are bound to occur.
Source :- https://sofiejohn.blogspot.com/2021/09/resolved-canon-printer-error-code-u075.html
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Step 1: open the printer’s lid
The first step is to open the lid of the printer and wait for sometimes for the cradle to move on its own towards the cartridge replacement position.
Now, carefully remove both of the cartridges from the printer.
Step 2: Examine all label if the printer
Users are advised to examine the labels to make sure that one is in black color (PG-37/PG-40/PG-50/PG-510/PG-512/PG-540/PG-540XL) and the other one is colored (CL-38/CL-41/CL-51/CL-511/CL-513/CL-541/CL-541XL).
Step 3: Locate the printer
Locate carefully your printer slot for the black cartridge as well as the colored one by using indicators on the printer or the cartridge cradle.
Finally, both cartridges need to be re-installed in the correct slot.
You will now see that the “U075” message will disappear automatically by allowing you to continue printing. However, if the message still remains, there is every possibility that one or more of the cartridges will be mislabeled.