Installing Canon MX420 Drivers for Mac OS X 10.x
The BSD Tutorial Shows You Step-by-Step How-to Download and Install the Canon MX420 Series All-in-One Scanner Driver on Mac OS X 10.10 Yosemite Unix/BSD Desktop.
If the Canon Printer Drivers for Mac OS X Yosemite are not available then you can still Use the Existing Ones for the latest version of mac os x 10.8+…
Included in the Canon MX420 Installation Tutorial for Mac OS X You will find also Link to Guide for Getting-Started with Canon MX420 Scanner on Mac OS X.
Canon MX420 Printers Series Include the following Models: PIXMA MX420, PIXMA MX421, PIXMA MX422, PIXMA MX423, PIXMA MX424, PIXMA MX425, PIXMA MX426, PIXMA MX427, PIXMA MX428.

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Download Canon MX420 Series Scanner Mac OS X Driver:
Get the MX420 Series Printers ScanGear Scanner Driver.
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Double-Click on .dmg/.pkg Canon Archive/Package
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Continue
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Confirm for Installation
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For Further Instructions See the Canon MX420 Online Mac Manual: