https://community.usa.canon.com/t5/Desktop-Inkjet-Printers/Pixma-MP520/m-p/190179#M44945 I found answer in manual. Press &amp; hold Stop/Reset button for over 5 seconds. It worked. Fri, 28 Oct 2016 02:26:59 GMT wiz1 2016-10-28T02:26:59Z https://community.usa.canon.com/t5/Desktop-Inkjet-Printers/Pixma-MP520/m-p/190178#M44944 <P>Pixma MP520 how to print with black ink when color ink out</P> Fri, 28 Oct 2016 02:13:51 GMT https://community.usa.canon.com/t5/Desktop-Inkjet-Printers/Pixma-MP520/m-p/190178#M44944 wiz1 2016-10-28T02:13:51Z https://community.usa.canon.com/t5/Desktop-Inkjet-Printers/Pixma-MP520/m-p/190179#M44945 I found answer in manual. Press &amp; hold Stop/Reset button for over 5 seconds. It worked. Fri, 28 Oct 2016 02:26:59 GMT https://community.usa.canon.com/t5/Desktop-Inkjet-Printers/Pixma-MP520/m-p/190179#M44945 wiz1 2016-10-28T02:26:59Z