Sharp FO-IS115N Operation Manual page 117

If [MEMORY FULL] appears...
If you place many originals in the feeder, the memory may become full before
all pages can be scanned (the display will show [MEMORY FULL]). If this
happens, only the pages that were scanned will be copied and the remaining
pages will automatically feed out. Repeat the copy procedure for the
remaining pages, including the page that was being scanned when the
memory became full.
Note: It may not be possible to make a copy of an original if a high resolution
setting is used and/or the original contains so much detailed content that the
memory becomes full before scanning finishes.
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