Canon maxify Mb5440.

B504 error. 

Some replacement ink tanks sold for the Canon MAXIFY series printers which are not manufactured by Canon may cause a B504 error to be displayed, causing the printer to shut down. In such cases, even though the printer's ink supply system is working properly, the design of the non-genuine ink tank is obstructing fluid ink supply to the print head, causing the B504 error. 

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