| 摘要 |
PURPOSE:To attain to enhance maintenance and the reliability of the system, by a method wherein the detachment and the erroneous insertion of a cable connector used in internal connection is detected by an electronic circuit package and displayed by LED to enable simple judgement. CONSTITUTION:Earthing circuit supplied from an electronic circuit package 1 is supplied to an electronic circuit package 2 opposed to said package 1 through a connecting pin 6 in a usual connecting state. Because the earth in the package 2 is passed through an inverter 9 to be brought to a signal level 1, LED7 comes to an OFF state and normal connection is shown. At the time of detachment and error insertion, because the earth is not supplied to the electronic circuit packages, a power source 8 (signal level 1) is inverted by the inverter 9 and the signal level 1 comes to zero. Therefore, LED comes to an ON state and detachment and erroneous insertion can be judged and the enhancement in maintenance and the reliability of the system can be attained. |
