商铺名称:厦门盈亦自动化科技有限公司
联系人:刘莉(小姐)
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企业邮箱:3001679289@qq.com
联系地址:厦门市集美区杏林禹州中央海岸一期5号楼923室
邮编:361022
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控制器CNX4-20K
用万能表检测电路板
1.离线检测
测出IC芯片各引脚对地之间的正,反电阻值.以此与好的IC芯片
进行比较,从而找到故障点.
2.在线检测
1)直流电阻的检测法
同离线检测.但要注意:
(a)要断开待测电路板上的电源;
(b)万能表内部电压不得大于6V;
(c)测量时,要注意外围的影响.如与IC芯片相连的电位器等.
2)直流工作电压的测量法
测得IC芯片各脚直流电压与正常值相比即可.但也要注意:
(a)万能表要有足够大的内阻,数字表为;
(b)各电位器旋到中间位置;
(c)表笔或探头要采取防滑措施,可用自行车气门芯套在笔头上,
并应长出笔尖约5mm;
(d)当测量值与正常值不相符时,应根据该引脚电压,对IC芯片正
常值有无影响以及其它引脚电压的相应变化进行分析;
(e)IC芯片引脚电压会受外围元器件的影响.当外围有漏电,短路,
开路或变质等;
(f)IC芯片部分引脚异常时,则从偏离大的入手.先查外围元器件,
若无故障,则IC芯片损坏;
(g)对工作时有动态信号的电路板,有无信号IC芯片引脚电压是不
同的.但若变化不正常则IC芯片可能已坏;
(h)对多种工作方式的设备,在不同工作方式时IC脚的电压是不同
的.
3)交流工作电压测试法
用带有dB档的万能表,对IC进行交流电压近似值的测量.若没有dB
档,则可在正表笔串入一只0.1-0.5μF隔离直流电容.该方法适用
于工作频率比较低的IC.但要注意这些信号将受固有频率,波形不
同而不同.所以所测数据为近似值,仅供参考.
4)总电流测量法
通过测IC电源的总电流,来判别IC的好坏.由于IC内部大多数为直
流耦合,IC损坏时(如PN结击穿或开路)会引起后级饱和与截止,使
总电流发生变化.所以测总电流可判断IC的好坏.在线测得回路电
阻上的电压,即可算出电流值来.
以上检测方法,各有利弊.在实际应用中将这些方法结合来运用.运用好了
就能维修好各种电路板。
控制器CNX4-20K
MX05Z0AH00A |
OPCNX4-RD |
OPCNX4-MD |
OPCNX4-HD |
OPCNX4-DVT |
OPCNX4-DVI |
OPCNX4-DVF |
OPCNX4-DVA |
OPCNX4-AC |
CNX4C-500 |
CNX4C-2K |
CNX4C-200 |
CNX4C-1K |
CNX4C-100 |
CNX4-50K |
CNX4-20K |
CNX4-1K |
CNX4-10K |
CNX4-100K |
CNX4-100 |
CONTROLST |
MEDIA-CONTROLST |
R2X2N1B1B2T0A |
R2X2N1A1A1T0A |
R2X2N1A0B1T0A |
R2X2N1A0A1T0A |
R2X1N1U1B1T0F |
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R2X4N1T1B2T0A |
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R2X4N1A1A2T0A |
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R2X4N1A0B2T0A |
R2X4N1A0A2T0A |
R2X2N1U1A1T0F |
MC-TAMT03 FTA, LLMUX TC, EC CC EA 51309223-175 |
MC-TAMT12 FTA, LLMUX TC W/RCJR, CE, CC EA 51309213-175 |
MC-TAOX02 FTA, A/O CCCE EA 51304476-175 |
MC-TAOX12 FTA, A/O RED CC EA 51304335-175 |
MC-TAOX52 A/O RED W/SCREW EA 51304335-275 |
MC-TAOY22 HD FTA, AO COMP W/STBY, CE, CC EA 51204172-175 |
MC-TAOY23 AO FTA RED EA 80366177-250 |
MC-TAOY52 HD FTA, AO SCREW W/STBY, CE, CC EA 51204174-175 |
MC-TAOY53 AO FTA RED EA 80364007-250 |
MC-TDIA12 FTA, D/I 120V CC EA 51304439-175 |
MC-TDIA22 FTA, D/I 240V CC EA 51304431-175 |
MC-TDIA52 FTA, D/I 120V CC EA 51304439-275 |
MC-TDIA72 FTA, 120VDI (CC) EA 51303930-150 |
MC-TDID12 FTA,D/I 24VDC CC EA 51304441-175 |
MC-TDID52 FTA,DIG INPUT 24VDC EA 51304441-275 |
MC-TDID72 FTA,D/O 24VDC CC EA 51303928-150 |
MC-TDIY22 FTA, DI 24VDC COMP, CE, CC EA 51204160-175 |
MC-TDIY62 FTA, DI 24VDC SCREW, CE, CC EA 51204154-175 |
MC-TDOA13 FTA, 120/240VAC SS D/O COMP, CE, CC EA 51304648-175 |
MC-TDOD13 FTA, 3/30VDC D/O COMP, CC EA 51304650-150 |
MC-TDOD23 FTA, 21/200VDC DO COMP, CE, CC EA 51309154-175 |
MC-TDOD53 FTA, 3/30VDC D/O SCREW, CC EA 51304650-250 |
MC-TDOD54 DO 3-30VDC SCRW T E C CC EA 51309153-275 |
MC-TDOR12 FTA, 120V RELAY DO COMP, CE, CC EA 51309148-175 |
MC-TDOR22 FTA, 240V RELAY CC EA 51309150-175 |
MC-TDOR52 FTA, 120V RELAY DO SCREW, CE, CC EA 51309148-275 |
MC-TDOY22 FTA, DO 24VDC COMP, CE, CC EA 51204162-175 |
MC-TDOY23 HD FTA, DO RELAY COMP, CE, CC EA 51204166-175 |