(2) A defendant may plead guilty or no contest on the day of arraignment or any time thereafter except that a defendant without counsel shall not be allowed to plead guilty or no contest to a felony on the day of arraignment.
(3) Upon completion of the arraignment, unless the defendant enters a plea in the manner provided in ORS 135.305 to 135.325, 135.335, 135.355, 135.360 and 135.375, the defendant shall be considered to have entered a plea of not guilty. [1973 c.836 §166; 2001 c.635 §13]