Every time circuit board cannot move according to normal circumstance, be no problem again through checking circuit, have electronic element very likely at that time broken, if want repair to must find problem cell, change again, but searching problem cell is a technical work, also have certain skill, teach everybody how to detect with avometer today a few commonly used electron component. Avometer resistor detects detect resistance is the most immediate the method undertakes metrical with avometer resistor archives namely, tag resistor size in the metropolis on resistor commonly, choose appropriate resistor archives, receive pen of red black list in two end, if reading is adjacent normal, otherwise broken, want to notice not to use both hands to feel pen of red black list when measuring great resistance, not be to be able to have risk giving a point, ensure however the accuracy that measures resistance, it is possible that the feeling that use a hand expresses a pen among them. Potentiometer detects normally the potentiometer below the circumstance has 3 to cite a base, check potentiometer with archives of avometer choice resistor first 3 whether are there two to bring the block between the foot to the value is or be close to potentiometer place to tag block value in citing a base, if differ,potentiometer of a lot of specifications already damaged, if normal avometer continues to measure these two to cite a base, next potentiometer anticlockwise rotate to be close to the position that close, right now block value is Yue Xiaoyue good, arrange hour hand to rotate again next, if resistor increases gradually, rotate to be close to place to tag block value to last block value, criterion potentiometer is normal. Potentiometer secures capacitor to detect besides with avometer choice capacitance blocks appropriate span to gauge electric capacity resistor file still can be used besides the value will measure, appropriate resistor archives should choose when measuring, with two watches the pen receives capacitor respectively two cite a base, block value should be infinity, if appear,block value is 0, criterion capacitor attaint. Fixed capacitor electroanalysises capacitor detects electroanalysis capacitor and fixed capacitor measurement technique are a bit different, of course you can choose to be blocked with capacitance will detect, this everybody is met, say to hold back the method that will measure with report, choose appropriate resistor archives above all, what red watch pen and black list pen contact capacitor respectively is polar, show value general at this moment from 0 begin increase, till show,spill over symbol 1, if show from beginning to end 0, show capacitor interior short circuit, if show 1 shows capacitor from beginning to end extremely open circuit, archives of resistor of possible also alternative is improper, here must notice, because electroanalysis,when measure capacitor has the cent of negative pole, so here is not received certainly instead, normally red watch pen receives capacitor positive pole below the circumstance (of length of foot that) , black list pen receives capacitor cathode (the foot is short that) , avometer of pressing with a finger is apropos and contrary. Electroanalysis capacitor inductance detects the resistor archives that chooses avometer likewise, receive watch pen in inductance two end, if be measured so that resistance is short circuit of 0 inductance interior, be measured below normal circumstance size of inductor dc resistor and circle make inductor coil place use enamel-insulated wire means, the line circles a number to have immediate concern, want to be able to measure a resistance only, can think inductance is normal. Inductance diode detects move avometer detect diode archives, with red watch the pen receives the positive pole of diode, black list pen receives the cathode of diode, be like what diode shows on indication screen to press fall (normally silicon is in charge of 0. 5, germanium is in charge of 0.
2) explain diode is normal, exchange expresses a pen, it is normal to be like indication screen to show 1, otherwise by puncture, if twice the test all is as a result 0 or diode of a specification already damaged. Diode glow diode detects move digital avometer likewise detect diode is blocked, with red watch the pen contacts glow diode positive pole, cathode of diode of glow of the black contact that express a pen (and above diode is same) , if see it is normal that it gives off light to explain, already damaged otherwise. CNC Milling
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