| 摘要 |
When the contacts are electrically disconnected under a condition where a handset is set in a concave of a charging stand, the output of a connection condition detecting circuit is of low level. Then, an inverted output thereof, that is, a high-level output is provided through an inverter to one input terminal of an AND circuit, and a switch is closed by the weight of the handset, so that a high-level output is provided also to the other input terminal of the AND circuit. Then, a logical product output of the AND circuit is of high level. As a result, a warning buzzer generates a warning sound to attract the user's attention.
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