
SG-1501B介紹(shao):
SG-1501B是(shi)韓國金進生(sheng)產的(de)壹款(kuan)AM/FM音頻信(xin)號發(fa)生器(qi),頻率範圍(wei)100K-150M,電(dian)平輸(shu)出:-133dBm ~ +13dBdBm. 選配GPIB控(kong)制接口(kou)
東莞某客(ke)戶(hu)寄(ji)修韓(han)國金進AM/FM音頻信(xin)號發(fa)生器(qi),根(gen)據客(ke)戶(hu)描(miao)述故(gu)障(zhang)為開(kai)機按鍵(jian)無作用(yong),面(mian)板LED數碼管(guan)全(quan)亮(liang),按鍵(jian)全亮(liang)。拿到(dao)儀(yi)器(qi)上(shang)電(dian)試機,故(gu)障(zhang)表(biao)現(xian)如客(ke)戶(hu)所說;
故(gu)障(zhang):
按鍵(jian)無作用(yong),面(mian)板LED數碼管(guan)全(quan)亮(liang),按鍵(jian)全亮(liang)。
檢(jian)修:
根(gen)據LED數碼管(guan)全(quan)亮(liang),判斷其前(qian)面(mian)板故(gu)障(zhang);
LED數碼管(guan)點亮(liang)由74HC595鎖(suo)存(cun)器(qi)控(kong)制,故(gu)判斷是位選IC故(gu)障(zhang),造(zao)成LED全亮(liang);
更換(huan)位選IC後,故(gu)障(zhang)有所好轉,按鍵(jian)起作(zuo)用,但是故(gu)障(zhang)依舊(jiu)沒(mei)*消(xiao)除(chu);
後差主(zhu)控(kong)板,發(fa)現(xian)LED數據編碼(ma)異(yi)常(chang),萬用(yong)表(biao)確定故(gu)障(zhang)點為編譯芯(xin)片;
更換(huan)編譯芯(xin)片後,故(gu)障(zhang)消(xiao)除(chu)
分(fen)析(xi)原因(yin):
根(gen)據故(gu)障(zhang)分(fen)析(xi),可(ke)能(neng)是由於客(ke)戶(hu)使(shi)用(yong)GPIB使(shi)用(yong)不(bu)當(dang)造(zao)成。



