Avision AM7100NF User Manual - Manual (Page 71)

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To place your original into the ADF input tray,
1. Insert a stack of document into the ADF input tray with the Long Edge of
your document pointing to the ADF input tray.
2. Make sure the text FACE UP and the first page on top of the stack.
3. Ensure that the edge of your document touch the paper guides at both
sides.
Note:
If there is no paper in the ADF input tray, the product considers the scan
source is flatbed glass. If there is paper in the ADF input tray, the product
considers the scan source is ADF input tray.