The county board of any county that establishes a code hearing unit pursuant to this Division 5-41 may, by ordinance, establish a fine schedule for code violations. The fine schedule must include (i) a determinate fine for each code violation that may be voluntarily paid by a respondent prior to his or her hearing date and (ii) the fine that may otherwise be imposed for each code violation. The amount of each fine must be based upon the nature of the offense and the number of previous code violations a respondent was convicted of committing for the same or a related offense.