At least 90 days before the hearing on the petition under this chapter, notice of the time and place of the hearing and a copy of the petition shall be served on the person named in the petition and, if the petitioner is not the conservator of the person, on the conservator, if any. Service shall be made in the manner provided in Section 415.10 or Section 415.30 of the Code of Civil Procedure or in such manner as may be authorized by the court.