Canon CanoScan FB620U - Manual (Page 23)

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• The maximum allowable size for scanning is 8.5 x 11.69 inches (216 x 297 mm), up to A4
or letter size.
• This scanner is equipped with an ultra-sensitive scanning unit. Opening the document
cover during scanning or improperly closing it may not produce proper results. When the
document cover cannot be closed because you are scanning thick documents, such as
books, cover the document glass with a dark cloth to prevent ambient light from
affecting the scan.