Canon 4204B019AA User Manual page 361

When the document has been loaded in the ADF:
The machine starts scanning the next sheet of document automatically after one sheet of
document finishes being scanned.
Note
If Memory is full appears on the LCD when scanning, set the print quality to Standard or reduce the
number of sheets of documents, then try copying again. If the problem is not resolved, set the print
quality to Fast and try copying again.
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