Ricoh Aficio 650 Operating Instructions Manual page 185

B
Select the part to be erased.
Erase Centre
A Touch the [Erase Centre] key.
B Set the centre width with the [n] [o] keys. Then touch the [OK] key.
Note
To change the value entered, press the [n] [o] keys and set the new
value.
Erase Border (Setting with the same width)
A Touch the [Erase Border] key.
Erase Centre/Border—Erasing The Centre And The Border
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