Section 320.3. Notice of rights

At the time the respondent first appears
  before the court, the respondent and his parent or other person  legally
  responsible  for  his care shall be advised of the respondent's right to
  remain silent and of his right to be represented by  counsel  chosen  by
  him  or by a law guardian assigned by the court. Provided, however, that
  in the event of the failure of the respondent's parent or  other  person
  legally  responsible  for  his  care  to  appear,  after  reasonable and
  substantial effort has been made to notify such  parent  or  responsible
  person   of   the  commencement  of  the  proceeding  and  such  initial
  appearance, the court shall appoint a law guardian.