可视对讲门铃没有声音视频上下滚动是什么原因

可视对讲门铃没有声音视频上下滚动是什么原因
2025-03-16 06:46:03
推荐回答(1个)
回答1:

没有声音和视频滚动应该是两个问题。首先排除是否楼下主机的故障,看看邻居家是不是正常。如果能确定是你家特有的故障,可从以下几方面查找原因:
1、听筒故障,如果听筒坏了,显然是没有声音的,确认听筒故障的方法,拿下听筒,用手反复按压挂听筒的叉簧开关,看听筒中是否有轻微的咔咔声,如果有声音则表示听筒正常。
2、叉簧故障,对于使用年限比较长的话机,叉簧故障比较常见,检查方法:拿起听筒,用手反复按压叉簧开关,感觉压下、松开时弹性是不是良好,有没有清脆的咔嗒声,如果感觉弹性不足,则可能是叉簧开关接触不良,确认的方法是用万用表测量触点之间的电阻。
3、主板损坏,比较少见,而且如果主板有故障一般会伴随着没有图像而不是图像滚动。
图像滚动的故障是典型的场同步不良,一般来说是由于线路上的信号损失、话机上的元件老化导致放大能力下降,造成图像信号变弱,这种情况可通过微调场同步电位器来解决。拆开话机找到显示模组电路板上的V.HOLD的电位器,左右轻轻转动,观察滚动速度,调至图像稳定即可。

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