| 摘要 |
PURPOSE:To check operation by a device with a small-sized and unexpensive construction, by changing frequency to sound an acoustic device in accordance with a defective point. CONSTITUTION:When there is no trouble in all operation checking parts A, B, C, AND circuits 3-1, 4-1 in a trouble detecting part 9-1 are on and the frequency of an oscillator 5 through the AND circuit 4-1 is outputted as it is through a transisor (TR) Tr1 to sound a speaker 8. If there is a trouble in the part A, a trouble detecting part 9-2 is actuated and the frequency of the oscillator 5 is divided into a half by a 1/2 frequency dividers 2-1 to sound the speaker 8 by the divided output. When there is a trouble in the part B, the frequency is divided into 1/4 by the 1/2 frequency dividers 2-1, 2-2, and at the detection of a trouble in the part C, the frequency is divided into 1/8 by the frequency dividers 2-1, 2-2, 2-3 in the same manner and the speaker 8 is sounded through trouble detecting parts 9-3, 9-4 respectively. However when twice or more troubles are detected, the skeaper 8 is not sounded. |
