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There are many methods to scan. Since you are using a Mac, you have to initiate the scanning process from your Mac.
You can use Image Capture application to scan. Go to Applications folder and open Image Capture application. Image Capture will recognize the scanner and show in left column. Select the scanner (printer) and click Scan.
Method 2 :
Go to Applications folder and open Preview application. In Preview application, click on File menu and select Import from Scanner.
Method 3 :
Go to System Preferences and select Print and Scan or Printers and Scanners. Select your printer in left, click on Scan top on right top and click Open Scanner.
Method 4 :
Go to Applications folder and you will see Canon IJ Scan or Canon Scan app there. Open it and use it to scan.
If you have any difficulty on following the steps above or if you get any errors while scanning, please let me know and I will continue to help you
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