| 摘要 |
In a TV tuner having AFC and having a switch effective when actuated to disable the AFC, a detent member rotatable with the channel selector shaft has raised portions and recesses and resilient means cooperates therewith to produce detent action by riding over the raised portions and into the recesses. There is also a fine tuning means which includes a fine tuning shaft. The AFC defeat switch is provided with an operating lever which is moved to switch-actuating position either by the resilient means as it rides over the raised portions of the detent member or by the fine tuning shaft when the latter is moved to enable the fine tuning means.
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