| 摘要 |
PURPOSE:To prevent the component of a circuit damaged by prohibiting to turn on a main power source circuit again when the number of times of a protective operation to turn off the main power source circuit of a microcomputer arrives a prescribed number of times. CONSTITUTION:When the number of times of the protective operation to turn off the main power source circuit 14 of the microcomputer 40 arrives at the prescribed number of times, it is prohibited to turn on the main power source circuit 40 again until an AC plug 10 is extracted and is inserted again. In other words, an overvoltage/overload state can be prevented exceeding the prescribed number of times by comprising a circuit in such a way that the AC plug 10 is extracted and is inserted again when the number of time of a power source abnormality protective operation arrives at the prescribed number of times. In such a way, the secondary damage of the component due to the repeat of the overvoltage/overload state can be prevented from occurring, and danger to a user due to a fault can be reduced, and repair efficiency can be improved. |
