Komatsu PC118MR-8 Operation And Maintenance Manual page 138

INSTRUMENTS AND CONTROLS
In the screen for parameters 1) and 2), the following operations
are possible using function keys F2 and F6.
q F2: Resets all settings to default values
q F3: The cursor for the parameter selected moves by one
segment to the left.
q F4: The cursor for the parameter selected moves by one
segment to the right.
q F5: Return to user menu.
q F6: Confirm modification and set next parameter.
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