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              深圳市金維通訊技術有限公司
              電話交換機程控電話交換機威譜電話交換機國威電話交換機...網點分布:深圳 廣州 中山 佛山 珠海 惠州

              電話機出現雜音的原因分析


              國威電話交換機雜音問題很常見,在出現雜音的時候,相信多數人和我的想法是一樣的,都覺得是信號的問題,或者是線沒有插好的原因,當然不只有這兩種原因,當電話出現雜音時有可能是其他原因造成的,下面就是故障產生原因的分析判斷:

              1、本機故障造成的雜音

              首先是回路電阻增大會導致電話機出現雜音。程控交換機要求回路電阻不大于2000Ω(包括電話機電阻,并保證饋電電流不小于18mA)。常見故障:一是叉簧開關接觸不良,二是水晶頭插座接觸不良,三是電話接線盒接觸不良。
              送話電路不良時,也會使送話信號中疊加雜波成份,這種雜波成份,回授到受話電路中,經放大后就會在受話器上產生較大的雜音。
              駐極體送話器是當前應用最多的一種,它的輸入輸出阻抗都很高,所以對工作環境要求較高,在潮濕的環境下,其絕緣特性、阻抗特性會發生變化,最容易出現因漏電造成雜音。
              判斷是否為送話器不良造成的故障,其方法是:把送話器取下,將兩個引線短路,然后聽受話器中是否還有雜音。若無雜音則故障為送話器不良,更換送話器即可;若受話器中仍有較大的雜音,則為受話電路及其它電路故障。常見故障原因有:手柄連線不良;受話放大電路的去耦電容損壞;受話放大電路的負反饋元件損壞;增益控制元件損壞;其他電路的去耦電容損壞;通話集成電路損壞等。
              具有免提功能的電話機,雜音故障的判斷方法更為簡單。若用手柄話機通話時雜音大,而在免提狀態下正常,一般是手柄話機的送話器不良、手柄連線接觸不良或受話放大電路有故障。假若用手柄通話正常,而免提有較大雜音,表明免提狀態下的送話電路有故障,常常是免提送話器受潮后漏電或損壞。
              另外,收鈴電路出現故障同樣造成雜音,如:鈴流耦合電容漏電后會使饋電電流變的不穩定,使通話電路產生雜音。只是這種故障極少出現,一旦出現可采用斷開收鈴電路的方法進行判斷。

              2、線路接觸不良造成雜音

              國威電話交換機線路中的接頭出現嚴重氧化后,形成了一個較大的接觸電阻,導致電路中電流減小并且不穩定,從而使話機中產生較大的雜音。常見故障原因有:“用戶接線盒”接線螺絲接觸面氧化,用戶分線筒接線螺絲接觸面氧化,線路接頭接觸不良。只要將線頭刮凈,重新可靠連接,雜音即能消除。

              3、線路接地造成的雜音

              當線路出現單線接地后,國威電話交換機通話時受話器中將出現較大的雜音(通常又稱為“地氣聲”)。這是因為電話機的正常工作電流一般在20-50mA之間,線路接地后,就會產生分流,使一部分電流通過接地點流入大地,這不僅使電話機中的電流減小,同時還使流過電話機的電流不穩定,導致受話器出現雜音。
              另外“保安器”不良也會造成電路雜音。“保安器”在交換局方的配線架(柜)上,這是線路入局的第一級保安裝置,當線路受雷擊或高電壓大電流沖擊時,該裝置進行放電保護。但是當保安器出現接地時,同樣造成上述故障。

              4、其他用戶話機及線路不良造成的雜音

              假如本電話機(主叫用戶)呼出本局內某一電話用戶時,電路接通后受話器中出現較大的雜音,若通話雙方都聽到有較大的雜音,那么這種故障屬對方電話機及線路故障,假若只有我方聽到有較大雜音,而對方基本正常,那么這種故障屬對方電話機送話電路故障。常見故障是對方送話器不良。

              深圳市金維通訊技術有限公司主要從事:電話交換機,國威電話交換機,松下電話交換機,西門子電話交換機,數字電話交換機,威譜智能電話交換機,程控交換機報價,是一家專業的深圳電話交換機公司.

              本文由“集團電話”收集撰寫,轉載請注明出自:深圳市金維通訊技術有限公司

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