A switch-mode modulator operating at a two-level voltage and including an alternating output stage, an optional output filter and a feedback including a function block with a transfer function. This slide mechanism includes a rail part which is mounted on the surface of the second housing in a manner of extending in the vertical direction and is configured such that when the first housing has slidingly moved by means of the slide mechanism to the upper end side of the second housing, the operating part of the second housing will appear. During start up of the LLC converter, first and second signals having a fixed period and a variable duty cycle are applied to the first and second switches respectively. A locating slot is defined at a rear end of the tray, and an opening is defined between a rear edge of the tray and the locating slot. Moreover, the fluid section includes a piston slidingly disposed in the throughbore of the liner. The image processing apparatus includes: a first USB connector; and a command transmitter that transmits a file manipulation command.