| 摘要 |
<p>PURPOSE:To stop the supply of power to a microprocessor (MP) and its reset circuit when one of the 1st and 2nd detecting means detects a fault by providing the titled device with the 1st and 2nd detecting means for detecting the voltage of a power supply means. CONSTITUTION:If it is supposed that the power supply of +5V is dropped less than a fixed level, a transistor (TR)4 is turned off and then a TR5 is turned on in a +5V power supply voltage level detecting circuit 2. In a +24V power supply voltage level detecting circuit 3, a TR1 is off and a TR2 is off. Since a TR5 is on, the base potential of a TR 3 in a +10V power supply circuit 4 approaches the earth potential of the base potential of a +10V power supply circuit 4 and the TR3 is turned off. Consequently, the +10V voltage of the +10V power supply circuit 4 is not supplied and the microprocessor MP5 and a level converting part 6 are not actuated. Namely, these parts are reset to prevent the parts from malfunction.</p> |
