| 摘要 |
PROBLEM TO BE SOLVED: To provide a magnetic disk reproduction circuit, wherein when the abnormal fluctuation in power supply voltage including power ON/OFF occurs, an MR head bias is prevented from exceeding a prescribed value, and the center potential of the MR head is controlled to a ground. SOLUTION: The reproduction circuit for the magnetic disk device is provided with an MR head, a bias circuit for applying a prescribed bias voltage to the MR head, an amplifier circuit for amplifying the output signal of the MR head, a power supply voltage monitoring circuit for monitoring power supply voltage fluctuation, and a control circuit controlled by the power supply voltage monitoring circuit. When the abnormal fluctuation in power supply voltage including power ON/OFF occurs, the MR head bias voltage is prevented from exceeding a prescribed value by the control circuit, and the center potential of the MR head is controlled to protect the MR head. COPYRIGHT: (C)2008,JPO&INPIT
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