Canon mx860 - Manual (Page 26)

2.
Use the Numeric buttons to enter a character.
Press the button repeatedly until the character you want to enter appears.
To enter a character that is assigned to the same button as the
previous entry (ex., to enter "A" after "C"):
Press the (Right) button, and press the same Numeric button.
(1) Press the button three times.
(2) Press the (Right) button, and press the button again.
To enter a space:
Press the (Right) button twice. In number mode, press the (Right) button once.
To delete a character:
Press the (Left) button.
To delete an entire entry:
Press and hold the (Left) button.
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Page 26 of 997 pages Guidelines for Entering Numbers, Letters, and Symbols