控制器CNX4-20K
用萬(wàn)能表檢測(cè)電路板
1.離線檢測(cè)
測(cè)出IC芯片各引腳對(duì)地之間的正,反電阻值.以此與好的IC芯片
進(jìn)行比較,從而找到故障點(diǎn).
2.在線檢測(cè)
1)直流電阻的檢測(cè)法
同離線檢測(cè).但要注意:
(a)要斷開待測(cè)電路板上的電源;
(b)萬(wàn)能表內(nèi)部電壓不得大于6V;
(c)測(cè)量時(shí),要注意外圍的影響.如與IC芯片相連的電位器等.
2)直流工作電壓的測(cè)量法
測(cè)得IC芯片各腳直流電壓與正常值相比即可.但也要注意：
(a)萬(wàn)能表要有足夠大的內(nèi)阻,數(shù)字表為;
(b)各電位器旋到中間位置;
(c)表筆或探頭要采取防滑措施,可用自行車氣門芯套在筆頭上,
并應(yīng)長(zhǎng)出筆尖約5mm;
(d)當(dāng)測(cè)量值與正常值不相符時(shí),應(yīng)根據(jù)該引腳電壓,對(duì)IC芯片正
常值有無(wú)影響以及其它引腳電壓的相應(yīng)變化進(jìn)行分析;
(e)IC芯片引腳電壓會(huì)受外圍元器件的影響.當(dāng)外圍有漏電,短路,
開路或變質(zhì)等;
(f)IC芯片部分引腳異常時(shí),則從偏離大的入手.先查外圍元器件,
若無(wú)故障,則IC芯片損壞;
(g)對(duì)工作時(shí)有動(dòng)態(tài)信號(hào)的電路板,有無(wú)信號(hào)IC芯片引腳電壓是不
同的.但若變化不正常則IC芯片可能已壞;
(h)對(duì)多種工作方式的設(shè)備,在不同工作方式時(shí)IC腳的電壓是不同
的.
3)交流工作電壓測(cè)試法
用帶有dB檔的萬(wàn)能表,對(duì)IC進(jìn)行交流電壓近似值的測(cè)量.若沒有dB
檔,則可在正表筆串入一只0.1-0.5μF隔離直流電容.該方法適用
于工作頻率比較低的IC.但要注意這些信號(hào)將受固有頻率,波形不
同而不同.所以所測(cè)數(shù)據(jù)為近似值,僅供參考.
4)總電流測(cè)量法
通過測(cè)IC電源的總電流,來(lái)判別IC的好壞.由于IC內(nèi)部大多數(shù)為直
流耦合,IC損壞時(shí)(如PN結(jié)擊穿或開路)會(huì)引起后級(jí)飽和與截止,使
總電流發(fā)生變化.所以測(cè)總電流可判斷IC的好壞.在線測(cè)得回路電
阻上的電壓,即可算出電流值來(lái).
以上檢測(cè)方法,各有利弊.在實(shí)際應(yīng)用中將這些方法結(jié)合來(lái)運(yùn)用.運(yùn)用好了
就能維修好各種電路板。
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 |
| R2X1N1U1A1T0F |
| R2X1N1U0B1T0F |
| R2X1N1U0A1T0F |
| R2X1N1T1B1T0A |
| R2X1N1T1A1T0A |
| R2X1N1T0B1T0A |
| R2X1N1T0A1T0A |
| R2X1N1P0A1T0F |
| R2X1N1O1A1T0F |
| R2X1N1O0A1T0F |
| R2X1N1P1A1T0F |
| R2X1N1N1A1T0A |
| R2X1N1N0A1T0A |
| R2X1N1M1A1T0A |
| R2X1N1C1B2T0A |
| R2X1N1B1B1T0F |
| R2X1N1B1A1T0F |
| R2X1N1M0A1T0A |
| R2X1N1B0A1T0F |
| R2X1N1A1B1T0A |
| R2X1N1A1A1T0A |
| R2X1N1A0B1T0A |
| R2X1N1A0A1T0A |
| R2X1N1B0B1T0F |
| R2X0N1U1B1T0F |
| R2X0N1U1A1T0F |
| R2X0N1U0B1T0F |
| R2X0N1U0A1T0F |
| R2X0N1T1B1T0A |
| R2X0N1T0B1T0A |
| R2X0N1T0A1T0A |
| R2X0N1P1A1T0F |
| R2X0N1T1A1T0A |
| R2X0N1P0A1T0F |
| R2X0N1O1A1T0F |
| R2X0N1O0A1T0F |
| R2X0N1N1A1T0A |
| R2X0N1N0A1T0A |
| R2X0N1M1A1T0A |
| R2X0N1M0A1T0A |
| R2X0N1C1B2T0A |
| R2X4N1T1B2T0A |
| R2X4N1T1A2T0A |
| R2X4N1T0A2T0A |
| R2X4N1A1B2T0A |
| R2X4N1A1A2T0A |
| R2X4N1T0B2T0A |
| 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 |
