HT201475: Upgrade to OS X El Capitan
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Q: known issues with compatibility for Canon mx870
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Jul 24, 2016 11:39 AMby Esquared,Your printer should work. If it doesn't:
1. Go to Printers and Scanners in System Preferences.
2. The printer should appear in the list at the left.
3. Select it and delete it by clicking on the - sign.
4. Then add a new printer by clicking the + sign.
5. When the Mac finds the printer, add it.
6. Try printing.
