Ricoh Aficio MP C3500 - Manual (Page 90)

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To enter the ratio with the number keys
Select a ratio using the number keys.
A
Press [Reduce / Enlarge].
B
Press [Number keys].
C
Enter the desired ratio with the number keys, and then press the {q} key.
D
Press [OK] twice.
E
Place your originals, and then press the {Start} key.