Introduction: The circuit that designs newly to board, debug a contact to go to can encounter a few difficulty, become especially board bigger, component compares a long time, often do not know how to start. But if had mastered,debug a method reasonably, debug rise will get twice the result with half the effort. The circuit that designs newly to board, debug a contact to go to can encounter a few difficulty, become especially board bigger, component compares a long time, often do not know how to start. But if had mastered,debug a method reasonably, debug rise will get twice the result with half the effort. The new PCB that comes to firm recapture board, we should observe probably above all, board go up to whether be put in the problem, whether to have apparent crack for example, have wait for a phenomenon without short circuit, open a way. If be necessary, can check power source to follow the resistance between ground wire enough big. Install component namely next. The module of mutual independence, when it is normal to if you were not sure to assure them,work, had better not all mount, however one part the mount of one part (small to comparing circuit, can all mount) , define breakdown scope so easily, when the problem is being encountered when lest arrives, do not know how to start. Generally speaking, can have held power source share first, detect with respect to electrify next voltage of power source output is normal. If when electrify you do not have too big assurance (although have very big assurance, also suggest you add a fuse, be ready for any eventuality) , can consider to use those who take current limliting function is adjustable regulated power supply. Set feel well to shed protective electric current beforehand first, be worth the voltage of power supply of stabilized voltage electricity next slowly upgrade attune, monitor voltage of input electric current, input and output voltage. If the process of upgrade attune is medium, had not appeared to sort the problem such as protection, and it is normal that output voltage also was achieved, show OK of power source part. Conversely, should disconnect power source, seek trouble site, repeat afore-mentioned measure, until till power supply is normal. Install other module gradually next, every had installed a module, check with respect to electrify, also be when electrify according to the measure above, in order to because design,avoid mistake or / had brought about with installation mistake flow and burned-out component. The way that seeks breakdown has commonly below a few kinds: ① measures voltage way. What should affirm above all is each chip power source the tension that cites a base is normal, it is normal to check all sorts of referenced voltages next, whether working voltage of each bits still waits normally additionally. For example, general silicon dynatron guides when connecting, BE knot voltage is in 0. 7V left and right sides, and CE knot voltage is in 0.
3V left and right sides is smaller perhaps. If the BE of a dynatron writtens guarantee,voltage is more than 0.
Except of 7V(special dynatron, amount to the) such as Lin Du canal for example, the likelihood is BE knot with respect to open circuit. Law of ② signal infuse. Add signal source to input end, next the weaveform that ordinal in the future measures each to nod, it is normal to look, in order to find breakdown place. Sometimes we also can use simpler method, grasp a forceps with the hand for example, go touching hit various input end, see output carry whether respond, this is used in the enlarge circuit middling such as frequency, video (but want to notice, the circuit of hot motherboard or the circuit with tall voltage, cannot use this method, may bring about) getting an electric shock otherwise. If touch before one class to did not react, and respond of the one class after touching, explain the problem goes advanced one class, answer to be checked mainly. ③ of course, still have the seeks trouble site method of a lot of other, look for example, listen, hear, feel etc. "Look " see component have namely damage without apparent machinery, for example burst, burn black, be out of shape wait for; " listen " it is normal to hear working voice namely, the exemple is some more consistent the thing that ought not to ring is in noisy, this noisy place does not ring or sound is abnormal wait for; " hear " check namely whether to have peculiar smell, the flavour that scorchs for example, flavour of capacitance electrolyte, for the electronic maintenance technician that has experience to, it is very sensitive; to these odour " feel " explore namely with the hand the temperature of parts of an apparatus is normal, for example too hot, too cool perhaps. Parts of an apparatus of a few power, the meeting when the job rises is calorific, if be felt,be cool, basically can judge it to rise without the job. But if ought not to be heated up the place heated up the place that perhaps should heat up too hot, that also is no good. Chip of general power dynatron, stabilized voltage, the job is no problem completely 70 degrees below. A what kind of concept are 70 degrees probably? If you go up hand pressing, can hold to above 3 seconds, with respect to the specification temperature is in 70 degrees probably the following (notice to want foretaste explore sex go feeling, must not handle scald) . Good, about debugged problem, we tell so much temporarily today, if want to understand more debugging method and experience, the book that can go looking for a few electric home appliancesCNC Milling
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