一只(zhi)μVisiON（優威信）ZL600立(li)體聲藍牙耳(er)機(ji)，故障(zhang)為不能開機(ji)，充不進電。

　　用(yong)小(xiao)一字儀表(biao)改錐沿外殼面板接縫細心撬開正面蓋(gai)板，再小(xiao)心取出電路板和內部電池(chi)。

　　注意：電(dian)路板與外殼問有兩處用(yong)膠粘接，要用(yong)小(xiao)―字改(gai)錐細心撥開；麥(mai)克風(feng)、發(fa)聲單元(yuan)都用(yong)膠固定在外殼上了(le)，輕拉出電(dian)路板到―定位置就行了(le)，注意別拽斷引線。

　　故障分析：這款藍牙(ya)耳機使用(yong)了容量為l00mAh的(de)(de)鋰(li)聚(ju)合物電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)，鋰(li)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)帶(dai)有(you)充(chong)放(fang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)保(bao)護(hu)板(ban)(ban)。測量鋰(li)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)輸出電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)為0．4V左(zuo)右，用(yong)5V電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)充(chong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)，測得充(chong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流為零。剝(bo)開包在(zai)鋰(li)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)保(bao)護(hu)板(ban)(ban)外層的(de)(de)絕緣膠皮，測得鋰(li)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)心(xin)的(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)為1.05V，說明鋰(li)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)太低(di)(di)，已經低(di)(di)于保(bao)護(hu)板(ban)(ban)的(de)(de)充(chong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)開啟電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)，保(bao)護(hu)板(ban)(ban)起保(bao)護(hu)作(zuo)用(yong)，斷開了充(chong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)回路。

　　于是用外接(jie)(jie)5V電(dian)(dian)(dian)源串(chuan)聯33Ω電(dian)(dian)(dian)阻直接(jie)(jie)對鋰電(dian)(dian)(dian)心(xin)充(chong)(chong)電(dian)(dian)(dian)，測得充(chong)(chong)電(dian)(dian)(dian)電(dian)(dian)(dian)流(liu)從(cong)100mA逐漸下降(jiang)，鋰電(dian)(dian)(dian)心(xin)的(de)端電(dian)(dian)(dian)壓逐漸上升，當上升到(dao)3V左右時(shi)停止外接(jie)(jie)充(chong)(chong)電(dian)(dian)(dian)，使用原機配(pei)的(de)充(chong)(chong)電(dian)(dian)(dian)線插人藍牙耳(er)機的(de)充(chong)(chong)電(dian)(dian)(dian)插口，這時(shi)可(ke)以正(zheng)(zheng)常充(chong)(chong)電(dian)(dian)(dian)了(le)！將鋰電(dian)(dian)(dian)心(xin)和保(bao)護板(ban)用絕(jue)緣(yuan)膠皮包好(hao)，裝(zhuang)回耳(er)機內部，按原樣恢(hui)復藍牙耳(er)機，正(zheng)(zheng)常充(chong)(chong)電(dian)(dian)(dian)，雨(yu)個多(duo)小時(shi)后充(chong)(chong)滿電(dian)(dian)(dian)，可(ke)以正(zheng)(zheng)常使用了(le)。

　　本以為這個(ge)藍牙耳機修復成功了(le)，于(yu)是(shi)用(yong)其(qi)聽歌試(shi)用(yong)，2個(ge)多(duo)小時后(hou)電量耗盡自動關機，再測試(shi)又回到(dao)了(le)原來的故(gu)障(zhang)狀(zhuang)態：既不能開機也充不進電，又處于(yu)保(bao)護(hu)狀(zhuang)杰(jie)。

　　綜合分析(xi)：鋰電(dian)(dian)池(chi)保(bao)(bao)護(hu)(hu)板(ban)的(de)(de)放電(dian)(dian)保(bao)(bao)護(hu)(hu)功(gong)能失效(xiao)，放電(dian)(dian)終止電(dian)(dian)壓(ya)低于充電(dian)(dian)開(kai)啟(qi)電(dian)(dian)壓(ya)。可以(yi)選擇(ze)的(de)(de)修(xiu)復方(fang)案有：（1）更換新的(de)(de)帶保(bao)(bao)護(hu)(hu)板(ban)的(de)(de)鋰電(dian)(dian)池(chi)。但一時很難(nan)買到容量(liang)相近、尺寸相符的(de)(de)鋰電(dian)(dian)池(chi)；（2）保(bao)(bao)留鋰電(dian)(dian)心，更換鋰電(dian)(dian)保(bao)(bao)護(hu)(hu)板(ban)。可從淘汰(tai)的(de)(de)或損(sun)壞的(de)(de)舊(jiu)MP3內部的(de)(de)鋰電(dian)(dian)池(chi)上拆下大小合適的(de)(de)鋰電(dian)(dian)保(bao)(bao)護(hu)(hu)板(ban)換上，但這條途徑也(ye)有困難(nan)。在上述兩種方(fang)法都難(nan)以(yi)實(shi)現(xian)的(de)(de)情況下，我采用了如圖(tu)所示的(de)(de)應(ying)急方(fang)法進(jin)行(xing)維(wei)修(xiu)。

　　修理方法：圖中(zhong)虛線(xian)方框中(zhong)為鋰(li)(li)電(dian)(dian)(dian)保(bao)(bao)(bao)(bao)護(hu)(hu)板(ban)內部示意圖，經檢查(cha)，這(zhe)個(ge)(ge)藍牙耳機的鋰(li)(li)電(dian)(dian)(dian)保(bao)(bao)(bao)(bao)護(hu)(hu)板(ban)在鋰(li)(li)電(dian)(dian)(dian)池(chi)負(fu)極(ji)充電(dian)(dian)(dian)電(dian)(dian)(dian)路中(zhong)有一個(ge)(ge)無(wu)(wu)觸點(dian)開關(guan)，鋰(li)(li)電(dian)(dian)(dian)保(bao)(bao)(bao)(bao)護(hu)(hu)板(ban)通過這(zhe)個(ge)(ge)無(wu)(wu)觸點(dian)開關(guan)的通、斷來對鋰(li)(li)電(dian)(dian)(dian)池(chi)起充、放(fang)電(dian)(dian)(dian)保(bao)(bao)(bao)(bao)護(hu)(hu)作用(yong)。現在鋰(li)(li)電(dian)(dian)(dian)池(chi)保(bao)(bao)(bao)(bao)護(hu)(hu)板(ban)的放(fang)電(dian)(dian)(dian)倮(luo)護(hu)(hu)功能失效，放(fang)電(dian)(dian)(dian)終止電(dian)(dian)(dian)壓低于充電(dian)(dian)(dian)開啟(qi)電(dian)(dian)(dian)壓，導致無(wu)(wu)法充電(dian)(dian)(dian)，為此，用(yong)電(dian)(dian)(dian)阻R和發(fa)光二極(ji)管(guan)D串聯后再(zai)并接(jie)到這(zhe)個(ge)(ge)無(wu)(wu)觸點(dian)開關(guan)的兩側（即鋰(li)(li)電(dian)(dian)(dian)池(chi)保(bao)(bao)(bao)(bao)護(hu)(hu)板(ban)的負(fu)極(ji)引出線(xian)與鋰(li)(li)電(dian)(dian)(dian)池(chi)負(fu)極(ji)之間），為鋰(li)(li)電(dian)(dian)(dian)池(chi)搭建(jian)負(fu)極(ji)輔助充電(dian)(dian)(dian)電(dian)(dian)(dian)路。發(fa)光二極(ji)管(guan)D選用(yong)導通電(dian)(dian)(dian)壓1．5V～2．0V的紅色(se)或綠色(se)貼片(pian)LED，電(dian)(dian)(dian)阻R起限流作用(yong)，可選用(yong)100Ω左右的貼片(pian)電(dian)(dian)(dian)阻。

       充電過程：剛充電時鋰電池電壓低于鋰電保護板的充電開啟電壓，鋰電保護板內部的無觸點開關斷開，但充電電流由電源正極流經鋰電池后，從鋰電池的負極經電阻R和發光二極管D流到電源負極，給鋰電池充電(dian)(dian)(dian)(dian)(dian)(dian)：隨著充電(dian)(dian)(dian)(dian)(dian)(dian)的(de)(de)進行，鋰電(dian)(dian)(dian)(dian)(dian)(dian)池電(dian)(dian)(dian)(dian)(dian)(dian)壓逐(zhu)漸上升達(da)到鋰電(dian)(dian)(dian)(dian)(dian)(dian)保(bao)護(hu)(hu)板的(de)(de)充電(dian)(dian)(dian)(dian)(dian)(dian)開(kai)啟(qi)電(dian)(dian)(dian)(dian)(dian)(dian)壓時(shi)，鋰電(dian)(dian)(dian)(dian)(dian)(dian)保(bao)護(hu)(hu)板內部的(de)(de)無(wu)觸點開(kai)關導通，鋰電(dian)(dian)(dian)(dian)(dian)(dian)池進人正常充電(dian)(dian)(dian)(dian)(dian)(dian)狀態；當鋰電(dian)(dian)(dian)(dian)(dian)(dian)池充電(dian)(dian)(dian)(dian)(dian)(dian)到約3．7V（實測）時(shi)，發光(guang)二極管(guan)D截止，電(dian)(dian)(dian)(dian)(dian)(dian)阻R和發光(guang)二極管(guan)D串聯(lian)構成的(de)(de)負極輔助充電(dian)(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)(dian)路(lu)斷(duan)開(kai)，但這時(shi)鋰電(dian)(dian)(dian)(dian)(dian)(dian)保(bao)護(hu)(hu)板維持對鋰電(dian)(dian)(dian)(dian)(dian)(dian)池充電(dian)(dian)(dian)(dian)(dian)(dian)；當鋰電(dian)(dian)(dian)(dian)(dian)(dian)池充滿時(shi)（約4．2V），鋰電(dian)(dian)(dian)(dian)(dian)(dian)保(bao)護(hu)(hu)板內部的(de)(de)無(wu)觸點開(kai)關斷(duan)開(kai)，起到充滿保(bao)護(hu)(hu)作用。

　　由于電(dian)阻R和發(fa)光二極管D這兩個貼片元件體(ti)積很(hen)小(xiao)，將它們串聯焊在一起，并聯到鋰(li)電(dian)池保護(hu)板上(shang)后(hou)可以直接放(fang)在保護(hu)板邊上(shang)，也可以用細導(dao)線引出來用雙(shuang)面不干膠(jiao)粘貼在藍牙耳機內部(bu)合適(shi)的位(wei)置。

　　注意事項：由于是靠發光二極管D的截止電壓來斷開輔助充電電路，輔助充電電路沒有穩定的關斷電壓，因此輸人的充電電源電壓應以⒋5V～5．0V為宜，盡可能接近5V，最高不能超過5．2V。日前市場上銷售的有些充電器實際輸出電壓與標稱值相差很大(da)，一定要實測輸出電壓是否在(zai)上述(shu)范圍之內(nei)。

　　由于這(zhe)(zhe)樣(yang)修理后鋰電池并沒有恢(hui)復放電保護功能(neng)，使用(yong)中(zhong)可能(neng)會因過放電影(ying)響鋰電池的(de)壽命，因此使用(yong)中(zhong)要(yao)(yao)注意電池放完電后應及(ji)時(shi)充電，不要(yao)(yao)在低(di)電壓下長時(shi)間擱置，最好不要(yao)(yao)等電量耗(hao)盡再充電，當工作(zuo)中(zhong)藍牙耳(er)機發出(chu)“嘀(di)嘀(di)”提示音時(shi)就(jiu)要(yao)(yao)及(ji)時(shi)充電。當然，這(zhe)(zhe)是(shi)應急使用(yong)的(de)方法(fa)，能(neng)買到相近規格(ge)的(de)鋰電池直接代換(huan)最好。