觸摸屏MC10L19B8GZHF
工業(yè)電路板維修技巧
不能過(guò)分依賴在線測(cè)試儀
1.功能測(cè)試不能代替參數(shù)測(cè)試
2. 功能測(cè)試僅能測(cè)試到器件的截止區(qū),放大區(qū)和飽和區(qū),但無(wú)法了解此時(shí)的工作頻率的高低和速度的快慢。
3. 對(duì)數(shù)字芯片而言,僅知道有高低電平的輸出變化,但無(wú)法查出它的上升和下降沿的變化速度。
4. 對(duì)于模擬芯片,它處理的是模擬的變化量。其受電路的元器件的分布,解決信號(hào)方案的不同的影響,是錯(cuò)綜復(fù)雜的。就目前的在線測(cè)試技術(shù),要解決模擬芯片在線測(cè)試是不可能的。所以,這項(xiàng)功能測(cè)試的結(jié)果,僅能供參考。
5. 大多數(shù)的在線測(cè)試議,在對(duì)于電路板上的各類(lèi)芯片進(jìn)行功能測(cè)試后,均會(huì)給出“測(cè)試通過(guò)”或“測(cè)試不通過(guò)”。那么它為什么不給出被測(cè)器件是否有問(wèn)題呢?這就是這類(lèi)測(cè)試儀的缺撼。因?yàn)樵诰€測(cè)試時(shí),所受影響(干擾)的因素太多。要求在測(cè)試前采取不少的措施(如斷開(kāi)晶振,去掉CPU和帶程序的芯片,加隔離中斷信號(hào)等等),這樣做是否均有效,值得研究。至少,目前的測(cè)試結(jié)果有時(shí)不盡人意。
6. 了解在線測(cè)試儀的讀者,均知道有這么一句行話?!霸诰€測(cè)試時(shí)不通過(guò)的芯片不一定是損壞的;測(cè)試通過(guò)的芯片一定是沒(méi)有損壞的?!彼慕忉尀椋缙骷茉诰€影響或抗干擾時(shí),結(jié)果可能不通過(guò),對(duì)此不難理解。那么,是否損壞的芯片在進(jìn)行測(cè)試時(shí),均會(huì)得出“不通過(guò)”呢?回答確實(shí)不能肯定。筆者與同行均遇到過(guò),明明芯片已損壞了(確切地說(shuō)換上這個(gè)芯片板子就不工作了),但測(cè)試結(jié)果是通過(guò)的。權(quán)威解釋為這是測(cè)試儀自身工作原理(后驅(qū)動(dòng)技術(shù))所致。故此我們不能過(guò)分依賴在線測(cè)試儀(盡管各廠家宣傳的很玄)的作用,否則將使維修電路板的工作誤入歧途。
觸摸屏MC10L19B8GZHF
AES-2 |
CHANGE-MGMT |
BC6L18B7D0ZHA |
MC10L15ABZF |
MC10L19B8GZHF |
MC10L19BBSZHF |
MC10L19B8SZHF |
BC6L17A8A0ZHA |
BC6L17C7A0ZHF |
BC6L17A8A0ZHF |
BC6L17C7A0ZHA |
MC10L15DDZF |
BC6L18C9D0ZHA |
BC6L18A8D0ZHA |
BC6L18RFD0ZHA |
MC10L15CDZF |
BC6L18RED0ZHA |
BC6L18D9D0ZHA |
CBL-000-F6-002 |
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 |
R2X2N1U0B1T0F |
R2X2N1U0A1T0F |
R2X2N1U1B1T0F |
R2X2N1T1B1T0A |
R2X2N1T1A1T0A |
R2X2N1O1A1T0F |
R2X2N1O0A1T0F |
R2X2N1N1A1T0A |
R2X2N1T0B1T0A |
R2X2N1T0A1T0A |
R2X2N1P1A1T0F |
R2X2N1P0A1T0F |
R2X2N1N0A1T0A |
R2X2N1M1A1T0A |
R2X2N1M0A1T0A |
R2X2N1B1A1T0F |
MC-ZHPR13 N/RED PM/APRM TO REDHPM EA |
MC-ZHPS01 PM/APM TO HPM CONTAINS 2 7 SLOT FILES EA |
MC-ZHPS11 PM/APM TO HPM U/G EA |
MC-ZPSR04 HPM PWR UG (CC) EA |
MC-ZPSUG1 PM PWR SUP UPGRD EA |
MF-BIMS11 BUS INTERFACE MODULE, 1/1 VERSION EA |
MF-CAUX11 AUX/HART SIGNAL CABLE EA |
MF-CAXE11 AUX/HART SIGNAL CABLE EXTENTION EA |
MF-CFCP11 FCA/R POWER CABLE EA |
MF-CIOE11 IOLA & IOLA SIGNAL CABLE EXTENSION PAIR EA |
MF-CIOL11 IOLA & IOLB SIGNAL CABLE PAIR EA |
MF-FCAR11 ZONE 1 FIBRE/COPPER ADAPTER EA |
MF-PWRM2X Power Fail Module EA |
MNTW35WIKXN NT BOOKS W/SFTWR EA 51196708-190 |
MP-C8DD01-100 DOOR, DOUBLE, LCN RITTAL TS8 CABINET EA |
MP-C8SD01-100 DOOR, FULL-SIZE, LCN RITTAL TS8 CABINET EA |
MP-CARDR2-100 SINGLE ZIP DRIVE EA |
MP-DCDCK1 US CRTRGE CLEANING KIT EA 51196485-500 |
MP-DCDDC2-100 35MB CRTG 5 PAK EA MP-DCDDC3-100 |
MP-DCDDC3-100 150MB CRTG 5 PAK EA |
MP-DPRU02-112 RECORDER EA MP-DPRU04-200 |
MP-DPRU02-122 2 PEN FAN FOLD EA 51196211-122 |
MP-DPRU03-113 RECORDER EA MP-DPRU04-200 |
MP-DPRU03-123 3 PEN FAN FOLD EA 51196211-123 |
MP-DPRU04-200 3 PEN RECORDER EA |
MP-EZCLP1-100 Universal CRT Clamp Kit EA |
MP-EZEE01-100 AUX EQUIP ENCLOSURE EA |
MP-EZMP01-100 SNGL CRT MOUNT, EZ EA |
MP-EZMP02-100 EZ CNSL,DUAL CRT MOUNT EA |
MP-FHSP10-200 SUPPORT CRT MNTG KIT EA 51197035-400 |
MP-FLSP04-200 PRIM CRT MNTG KIT EA |
MP-FOMK02-100 UCNE MTG LCN CAB 120 EA |
MP-FOMK03-100 UCNE MTG LCN CAB 240 EA |
MP-FOMK04-100 UCNE MTG LCN CL 120 EA |