Sharp UX-310 Operation Manual page 56

Receiving Documents
2
Press 1 to turn automatic reduction on, or 2 to turn it off.
If you selected AUTO, go to Step 3. If you selected 100%, go to
Step 4.
3
If you selected AUTO, select the reception ratio to be used in the
event that the memory becomes full (automatic reduction is not
possible when the memory is full). Press 1 for 93% or 2 for 100%.
4
Press the STOP key.
54
AUTO 100%
1 2
or
93% 100%
1 or 2
STOP