Ricoh Aficio 250 Reference Manual page 222

This section describes how to enter characters. When you enter a character,
it is shown at the position of the cursor. If there is a character at the cursor
position, the entered character is shown before the character.
Alphabets
ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
Symbols
Numerals
0123456789
Number keys
Enters numbers.
Quick Dial 01/29 to Quick Dial 28/56 (A to Z)
Press to enter upper and lower case letters.
[A ↔ ↔ ↔ ↔ ↔ a] key
Switches between upper and lower case.
Quick Dial 27/55
Space key.
Clear/Stop key
Deletes a character at the cursor position. You can delete a character at the
right end of a line even if the cursor is placed to the right of the character.
and
Press to move the cursor left and right.
Incert key
Press to incert the characters between the word.
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