开(kai)机(ji)“三无(wu)”、屡烧(shao)(shao)开(kai)关电(dian)(dian)(dian)(dian)源厚(hou)膜(mo)(mo)块(kuai)STR6020的(de)常见故障(zhang)原因和故障(zhang)排除(chu)方法日(ri)立NP82C机(ji)心彩电(dian)(dian)(dian)(dian)采用厚(hou)膜(mo)(mo)电(dian)(dian)(dian)(dian)路IC901(STR6020)与相关元(yuan)件组合一(yi)起构成(cheng)自(zi)激同步式串联(lian)型开(kai)关稳(wen)压(ya)电(dian)(dian)(dian)(dian)源。STR6020时有损(sun)坏(huai)，即①和④脚击(ji)穿(chuan)(chuan)而引起+B电(dian)(dian)(dian)(dian)压(ya)异常，保(bao)护电(dian)(dian)(dian)(dian)路动作(zuo)，烧(shao)(shao)坏(huai)交流(liu)保(bao)险(xian)，*终导致开(kai)机(ji)“三无(wu)”。该膜(mo)(mo)块(kuai)损(sun)坏(huai)的(de)原因及其修(xiu)(xiu)复代换(huan)(huan)方法是(shi)(shi)：(1)每次(ci)都是(shi)(shi)开(kai)机(ji)瞬间(jian)烧(shao)(shao)STR6020和行(xing)输出管、交流(liu)保(bao)险(xian)丝。故障(zhang)率较高的(de)元(yuan)件是(shi)(shi)：+300V大(da)滤波电(dian)(dian)(dian)(dian)解电(dian)(dian)(dian)(dian)容(rong)C906(180uF/450V)容(rong)量减小、漏(lou)电(dian)(dian)(dian)(dian)、起凸爆(bao)裂、失效，电(dian)(dian)(dian)(dian)源纹波系数增(zeng)大(da)，浪(lang)涌电(dian)(dian)(dian)(dian)流(liu)很大(da)而使厚(hou)膜(mo)(mo)块(kuai)损(sun)坏(huai)。这个电(dian)(dian)(dian)(dian)容(rong)内部电(dian)(dian)(dian)(dian)解液干(gan)涸，但看上(shang)去表面完好(hao)，*好(hao)是(shi)(shi)用180～220uF/400V代换(huan)(huan)。(2)行(xing)输出负载有严(yan)重短路，特别是(shi)(shi)“行(xing)管”击(ji)穿(chuan)(chuan)，“彩行(xing)”内部匝(za)间(jian)短路，偏转线圈损(sun)坏(huai)，行(xing)逆程电(dian)(dian)(dian)(dian)容(rong)击(ji)穿(chuan)(chuan)。应当(dang)查(cha)出负载短路的(de)原因，更换(huan)(huan)损(sun)坏(huai)的(de)元(yuan)件方可(ke)更换(huan)(huan)厚(hou)膜(mo)(mo)块(kuai)。西门(men)子(zi)驱动器6SE7023-8TP60-Z 电(dian)(dian)(dian)(dian)源模(mo)块(kuai)维修(xiu)(xiu)。淮安西门(men)子(zi)电(dian)(dian)(dian)(dian)源模(mo)块(kuai)维修(xiu)(xiu)保(bao)养

可(ke)能是IX0689CE(STK7358)引脚(jiao)虚(xu)(xu)焊、散热片虚(xu)(xu)焊、厚(hou)(hou)膜块(kuai)周围的元件(jian)虚(xu)(xu)焊、铜箔断裂，或(huo)者开关(guan)变压(ya)器(qi)的初(chu)、次级引脚(jiao)虚(xu)(xu)焊(有裂纹(wen)点)，致(zhi)使IX0689CE以(yi)及D708(RU2M)烧坏(huai)击穿。可(ke)查找出(chu)具体(ti)故障点，重(zhong)焊之(zhi)，或(huo)焊接开裂、断路之(zhi)处(chu)。例：熊(xiong)猫3636彩电(dian)，搬家时用手扶拖拉机(ji)拖运后，造成厚(hou)(hou)膜块(kuai)周围的电(dian)路板断裂、脱焊，致(zhi)使IX0689CE以(yi)及D708(RU2M)烧坏(huai)击穿。(2)若每(mei)次都是在(zai)开机(ji)瞬问烧IX0689CE和交流保险管(guan)，主要是烧内部的开关(guan)管(guan)。其原因可(ke)能是开关(guan)电(dian)源(yuan)电(dian)路某(mou)电(dian)容的正(zheng)负极反(fan)接。如：C735(4.7uF/250V)、C711(100uF/50V)软启动电(dian)容不能接反(fan)，不能失容。*好是将C735、C706、IX0689CE一(yi)并换掉淮安西(xi)门(men)子(zi)(zi)电(dian)源(yuan)模(mo)块(kuai)维(wei)修保养电(dian)源(yuan)模(mo)块(kuai)西(xi)门(men)子(zi)(zi)CU320报F30003维(wei)修。

故障(zhang)概述和(he)故障(zhang)原(yuan)因分(fen)析(xi)彩电(dian)(dian)(dian)无(wu)(wu)光、无(wu)(wu)图、无(wu)(wu)声(三无(wu)(wu))，测(ce)量电(dian)(dian)(dian)源(yuan)厚(hou)(hou)膜块(kuai)、保(bao)险管均已损(sun)坏，连(lian)换(huan)(huan)连(lian)烧(shao)。有时还(hai)连(lian)带损(sun)坏开关(guan)(guan)电(dian)(dian)(dian)源(yuan)电(dian)(dian)(dian)路中(zhong)的诸多元件，连(lian)带损(sun)坏电(dian)(dian)(dian)阻、三极(ji)管、“行(xing)管”、场输出(chu)块(kuai)和(he)微处理器。总(zong)之，这是一种综(zong)合性的故障(zhang)，称为“屡换(huan)(huan)屡烧(shao)电(dian)(dian)(dian)源(yuan)厚(hou)(hou)膜块(kuai)”。1．应用于彩电(dian)(dian)(dian)开关(guan)(guan)电(dian)(dian)(dian)源(yuan)中(zhong)的电(dian)(dian)(dian)源(yuan)厚(hou)(hou)膜块(kuai)型(xing)号(1)早期型(xing)号：STR440、STR450、STR45l、STR45lA、STR456、STR5004l、STR51041、STR52041、STR53041、STR59041、STRll006、STR50103、STR40090、STR3100、STR6533、STR6303、STR6208、STR6020、STR5041、STR50115、STR5412、。HG5412、IX0689XEZZ、JU0114、JU0130、JU0086、HMOll4、STR6307、STR-S6309、STR-S6308、STR-S6709、STR-D5095等。

直流(liu)-直流(liu)(DC/DC)变换器(qi)(qi)DC/DC变换器(qi)(qi)将一(yi)个固(gu)定的(de)直流(liu)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)压(ya)变换为(wei)可变的(de)直流(liu)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)压(ya),这(zhei)种技(ji)(ji)术被*应用(yong)于(yu)无(wu)轨电(dian)(dian)(dian)(dian)(dian)(dian)(dian)车、地(di)铁列车、电(dian)(dian)(dian)(dian)(dian)(dian)(dian)动车的(de)无(wu)级(ji)变速(su)和(he)控制(zhi),同(tong)(tong)时使上述控制(zhi)获得(de)加(jia)速(su)平稳、快速(su)响应的(de)性能(neng),并同(tong)(tong)时收到节约电(dian)(dian)(dian)(dian)(dian)(dian)(dian)能(neng)的(de)效果。用(yong)直流(liu)斩波器(qi)(qi)代替变阻器(qi)(qi)可节约电(dian)(dian)(dian)(dian)(dian)(dian)(dian)能(neng)(20~30)%。直流(liu)斩波器(qi)(qi)不(bu)*能(neng)起调压(ya)的(de)作(zuo)(zuo)用(yong)(开(kai)关电(dian)(dian)(dian)(dian)(dian)(dian)(dian)源), 同(tong)(tong)时还能(neng)起到有效地(di)抑制(zhi)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)网侧谐波电(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)噪声的(de)作(zuo)(zuo)用(yong)。通信(xin)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)源的(de)二次电(dian)(dian)(dian)(dian)(dian)(dian)(dian)源DC/DC变换器(qi)(qi)已商品化,模(mo)块采用(yong)高(gao)频PWM技(ji)(ji)术,开(kai)关频率(lv)(lv)在500kHz左(zuo)右,功(gong)率(lv)(lv)密(mi)度(du)(du)为(wei)5W~20W/in3。随(sui)着(zhe)大(da)(da)规模(mo)集(ji)成电(dian)(dian)(dian)(dian)(dian)(dian)(dian)路的(de)发展,要求电(dian)(dian)(dian)(dian)(dian)(dian)(dian)源模(mo)块实现小型化,因(yin)此就要不(bu)断提(ti)高(gao)开(kai)关频率(lv)(lv)和(he)采用(yong)新(xin)的(de)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)路拓扑结(jie)构,目前已有一(yi)些公司研制(zhi)生产了(le)采用(yong)零(ling)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)开(kai)关和(he)零(ling)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)压(ya)开(kai)关技(ji)(ji)术的(de)二次电(dian)(dian)(dian)(dian)(dian)(dian)(dian)源模(mo)块,功(gong)率(lv)(lv)密(mi)度(du)(du)有较大(da)(da)幅度(du)(du)的(de)提(ti)高(gao)。大(da)(da)隈(wei)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)源模(mo)块07报警维修 立(li)等可取(qu)。

走线(xian)阻(zu)(zu)(zu)抗大电(dian)(dian)(dian)源(yuan)(yuan)模块(kuai)(kuai)输出与负载连接(jie)(jie)(jie)必然(ran)要(yao)有(you)一段PCB走线(xian)，走线(xian)越(yue)长(zhang)、走线(xian)越(yue)窄则它的(de)(de)等效电(dian)(dian)(dian)阻(zu)(zu)(zu)越(yue)大。等效电(dian)(dian)(dian)阻(zu)(zu)(zu)可以认为是(shi)串(chuan)联在(zai)负载的(de)(de)工作(zuo)(zuo)回(hui)路中，将起(qi)(qi)到分(fen)(fen)(fen)压(ya)作(zuo)(zuo)用，因此导(dao)致(zhi)负载两端(duan)的(de)(de)电(dian)(dian)(dian)压(ya)小(xiao)(xiao)于(yu)模块(kuai)(kuai)的(de)(de)输出电(dian)(dian)(dian)压(ya)。此外，除了走线(xian)问题还有(you)很(hen)多(duo)情(qing)况(kuang)(kuang)起(qi)(qi)到类似的(de)(de)作(zuo)(zuo)用，比(bi)如焊点接(jie)(jie)(jie)触不(bu)良导(dao)致(zhi)等效电(dian)(dian)(dian)阻(zu)(zu)(zu)增加，线(xian)路氧(yang)化或(huo)腐蚀导(dao)致(zhi)等效电(dian)(dian)(dian)阻(zu)(zu)(zu)增加。图3 等效电(dian)(dian)(dian)阻(zu)(zu)(zu)导(dao)致(zhi)压(ya)降(jiang)4. 防反(fan)接(jie)(jie)(jie)二(er)极管(guan)很(hen)多(duo)产(chan)品(pin)的(de)(de)AC和(he)DC部分(fen)(fen)(fen)是(shi)不(bu)在(zai)一块(kuai)(kuai)板上的(de)(de)，在(zai)生产(chan)或(huo)终端(duan)客户使用中不(bu)可避免(mian)涉(she)及(ji)到插拔电(dian)(dian)(dian)源(yuan)(yuan)连接(jie)(jie)(jie)器(qi)的(de)(de)情(qing)况(kuang)(kuang)。为防止此过程(cheng)中的(de)(de)反(fan)接(jie)(jie)(jie)导(dao)致(zhi)的(de)(de)硬件(jian)损坏，常串(chuan)入(ru)一只二(er)极管(guan)解决(jue)。以压(ya)降(jiang)0.7V的(de)(de)二(er)极管(guan)为例，b1 b2间的(de)(de)电(dian)(dian)(dian)压(ya)将比(bi)a1 a2间电(dian)(dian)(dian)压(ya)小(xiao)(xiao)0.7V，这也就是(shi)上面所讨论的(de)(de)输入(ru)电(dian)(dian)(dian)压(ya)偏低的(de)(de)情(qing)况(kuang)(kuang)，可以通过选择压(ya)降(jiang)低的(de)(de)管(guan)子或(huo)者直接(jie)(jie)(jie)提高a1 a1间电(dian)(dian)(dian)压(ya)的(de)(de)方法(fa)解决(jue)。西门(men)子611电(dian)(dian)(dian)源(yuan)(yuan)模块(kuai)(kuai)上电(dian)(dian)(dian)跳(tiao)闸(zha)无(wu)显示(shi)维修。宁波发那科电(dian)(dian)(dian)源(yuan)(yuan)模块(kuai)(kuai)维修案例分(fen)(fen)(fen)享

西门子(zi)电源(yuan)(yuan)模块(kuai)维(wei)修6SN1145-1BA01-0BA1 **检测(ce)。淮安西门子(zi)电源(yuan)(yuan)模块(kuai)维(wei)修保养

检查稳(wen)压(ya)(ya)控制(zhi)环路(lu)元件(jian)(jian)。如：光(guang)电(dian)耦(ou)合(he)器损坏(huai)，造成稳(wen)压(ya)(ya)电(dian)路(lu)失控，+B电(dian)压(ya)(ya)异常升(sheng)高(gao)，厚(hou)膜(mo)(mo)块(kuai)呈(cheng)过流(liu)性(xing)损坏(huai)。这是一种常见病。例：创维CTV-8298A屡烧STR-S6309及R605，更换“光(guang)耦(ou)”IC603(TLP621)及6309、R605后(hou)，故障(zhang)排除。(2)开(kai)关(guan)厚(hou)膜(mo)(mo)块(kuai)内(nei)部开(kai)关(guan)和起保护(hu)作(zuo)用(yong)的(de)(de)尖峰(feng)电(dian)压(ya)(ya)吸收(shou)回路(lu)元件(jian)(jian)异常，失去保护(hu)作(zuo)用(yong)，导致屡烧电(dian)源厚(hou)膜(mo)(mo)块(kuai)。如开(kai)关(guan)管集电(dian)极(ji)尖峰(feng)电(dian)压(ya)(ya)吸收(shou)回路(lu)元件(jian)(jian)损坏(huai)。(3)换上新厚(hou)膜(mo)(mo)块(kuai)后(hou)，电(dian)视机(ji)能正常工作(zuo)，只是过十多天或半年(nian)后(hou)，又遭损坏(huai)，这是由于厚(hou)膜(mo)(mo)块(kuai)温升(sheng)过高(gao)引起的(de)(de)厚(hou)膜(mo)(mo)块(kuai)与“行管”共用(yong)一块(kuai)散热(re)片(pian)，使夏(xia)天高(gao)温时(shi)易损坏(huai)，有条件(jian)(jian)者，可设法增大其(qi)散热(re)片(pian)的(de)(de)面积(ji)，厚(hou)膜(mo)(mo)块(kuai)与散热(re)片(pian)接触不良，螺钉没有旋紧，导致厚(hou)膜(mo)(mo)块(kuai)温升(sheng)过高(gao)，功耗增大而损坏(huai)，检修时(shi)拧(ning)紧一点即可。淮安西门子电(dian)源模块(kuai)维修保养

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