Canon imageCLASS MF6540 Basic Operation Manual page 122

6
Press [ ] or [
dialing code you want to delete from the group.
7
Press [Clear].
8
Repeat steps 6 and 7 if you want to delete another one-touch speed dialing key
or coded speed dialing code.
9
Press [Stop] to return to the standby mode.
] to display the one-touch speed dialing key or coded speed
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