Sharp AL-2021 Operation Manual page 79

Problem
Unable to scan the
image.
Scanner transfer
speed is slow.
Cause and solution
If scanning is not possible, shut down your computer,
turn off the machine's power switch, and unplug the
machine's power cord. Next, start your computer,
restore power to the machine, and try scanning again.
If scanning is still not possible, check the following
items.
Your application is not TWAIN/WIA compliant.
→ If your application is not TWAIN/WIA compliant,
scanning will not be possible. Make sure your
application is TWAIN/WIA compliant.
You have not selected the scanner driver of the
machine in your application.
→ Make sure that the machine's scanner driver is
selected in your TWAIN/WIA-compliant application.
You have not specified all scanning preferences
appropriately.
→ Scanning a large area at high resolution results in a
large amount of data and extended scanning times.
The scanning preferences should be set appropriately
for type of original to be scanned, i.e., Text, Text/
Graphics, Photograph.
Your computer does not meet the system requirements
for the USB 2.0 interface (Hi-Speed mode).
→ See "HARDWARE AND SOFTWARE
REQUIREMENTS" to configure your system as
required for USB 2.0, and check if "Hi-Speed" is set.
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