Brother FAX 1920CN User Manual page 39

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The automatic document feeder (ADF) can hold up to 20 pages,
feeding each one individually through the machine. Use standard
(20 lb) paper when using the ADF.
Fan the paper, and then stagger the pages in the ADF as shown:
DO NOT use curled, wrinkled, folded, or ripped paper, or paper
with staples, paper clips, paste or tape attached. DO NOT use
cardboard, newspaper or fabric.
Make sure originals written with ink are completely dry.
DO NOT pull on the original while it is in progress.
2 - 2 LOADING ORIGINALS AND PAPER
Approx. 1/2 inch