| 摘要 |
<p>PURPOSE:To momently detect connector disconnection mainly caused by incomplete insertion or the like of connectors due to carelessness of a worker and to prevent connector disconnection by providing a discriminating circuit to electrically confirm the connection state of the connectors. CONSTITUTION:A discriminating circuit 2 provided on a printed circuit board 1 outputs a confirmation signal, which confirms connector disconnection, to a pattern wiring. This confirmation signal is returned again to the circuit 2 via a loop which passes through contacts 111 and 211 of each connector, a turning-back wiring 213, contacts 212 and 112, and a pattern wiring 4 to reach a pattern wiring 5. The circuit 2 discriminates the presence/absence of connector disconnection in accordance with the level of the returned confirmation signal. That is, the circuit 2 discriminates the absence of connector disconnection if the confirmation signal is returned with a prescribed level or more through the wiring 5, but the circuit 2 discriminates the presence of connector disconnection if the confirmation signal is not returned or the level is lower than a prescribed value though this signal is returned. Thus, connector disconnection is electrically detected, and connector disconnection mainly caused by incomplete insertion of connectors is momently detected and is prevented.</p> |
