12-02-2020 03:10 PM
Is the PGI-220BK ink tank new? Or is it refilled? Refilled ink tanks will cause this issue.
It is recommended that a new, genuine Canon PGI-220BK ink tank is used in your PIXMA MP640 to resolve this issue.
12-18-2020 04:04 PM
Please make sure that all of the tape/cellophane is removed from the ink tank.
Look in the printer where the ink tank is seated to make sure there isn't something in that slot that would cause the printer to not recognize the ink tank.
Also, you may try using a different PGI-220 ink tank.
If your PIXMA MP640 does not recognize multiple black ink tanks, it would appear that your PIXMA MP640 would require service. You are eligible for Canon's Upgrade Program. This is for out of warranty units which have been diagnosed to require service, or for some reason are incompatible with a new or upgraded system. This option allows you a one-time opportunity to purchase a replacement product, discounted from the list price.
To help you get up and running quickly, we also offer free standard shipping (if the order is completed by 12:30PM ET). If you would like to take part in this option, please call our Sales Department at (866) 443-8002 seven days a week, 8am to Midnight. Let them know you have been working with technical support and the Canon Upgrade Program was offered.