how to replace waste tank for canon printer s520
The waste tank for Canon printers absorbs excess ink arising from the printer head cleaning process and natural printing wastage.  However, contrary to its name, the waste tank is actually a small absorbent sponge, rather than a tank.  Ensure the power is off on your printer.  Carefully locate and remove the waste tank and insert a replacement, specific to your model, before returning to printing. Replacing the waste tank is best done when replacing the logic board based on their proximity.  Additionally, you may have to reset the printer to escape the error which can lock the printer and prevent further usage. 

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