| 摘要 |
PURPOSE:To reduce the number of signal terminals and to interchangeability with a memory device or cassette, by driving an erase coil and operate a temperature detecting element through the inversion of the polarity of an applied voltage to a driving signal common terminal. CONSTITUTION:Changeover switches SW1-SW4 are selected to the (a) side, and a current flows to a coil EC in the path of power supply V-SW1-SW2- signal terminal 16-diode D-erase coil EC-signal terminal 17-SW4-erase coil drive circuit-SW3-power supply V to generate bubble erase magnetic field. Further, the SWs 1-4 are changed over and a current flows in the path of power supply V-SW1-SW4-terminal 17-coil EC-thermister TH-terminal 16-temperature detection circuit TD-power supply V, the magnitude of current is measured at the detection circuit TD to detect temperatures. |
