Avision DS320F (DF-0707S) - Manual (Page 11)

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2.3 Installing the Paper Stopper
Note: This section applies only to the product with an automatic document
feeder.
Attach the Paper Stopper to the slot of the document cover as illustrated below.
- If you are using A4 or letter size paper, pull the lever up to avoid document
falling from the device to the floor.
- If you are using legal size paper, press down the lever.
Paper Stopper
Lever
Document
Cover