Yamaha AR-80 - Manual (Page 72)

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Clear
The Clear function lets you erase one or all instrument/key assignments.
To erase a single instrument assignment:
Simultaneously hold down the Data Control button corresponding to
CLEAR and press the key or pedal corresponding to the instrument you
wish to erase.
A short click sound indicates that the instrument has been erased.
To erase all instrument assignments:
1.
Press the Data Control button corresponding to CLEAR in the display (see
step #3 above).
2.
At the prompt, select “OK” (with the appropriate Data Control buttons) to
erase all assignments, or “Cancel” to abort the operation.
DATA CONTROL