Section 7.6.  Assessor.
   (a)   The assessor shall possess all the power vested in and shall be charged with the duties imposed upon the assessing officer by law.  He shall make and prepare all regular and special assessment rolls in the manner prescribed by law or ordinances of the city.
   (b)   He shall perform such other duties as may be prescribed by law or the ordinances of the city, or by the city manager.