(a) The provisions of Chapter 1137 shall apply to all existing signs rendered nonconforming by this section, provided, however, that no sign may be enlarged, reconstructed, altered to identify a different business or use, or structurally altered, unless conforming to the provisions of this section or any other applicable section herein. The replacement, installation, enlargement, reconstruction, or alteration of any sign shall not be permitted unless it conforms to the provision of this section.
(b) Minor repair, cleaning, or change of copy, for the same business or use shall be permitted regardless of the conforming or nonconforming status of the sign.