The supersonic cleaning of a magnetic head apparatus is executed while the
control conductive pattern and the conductive leaf spring are
electrically connected by means of soldering, and the conductive leaf
spring is grounded. This makes it possible to prevent the accumulation of
electrostatic charges in the piezoelectric elements on the magnetic head
apparatus, thereby preventing the development of surge current or
reducing the intensity thereof, and reducing the damage to the
reproducing elements and the recording element mounted on the slider of
the magnetic head apparatus.