PCB board detection is the perfect time to take note of some details, to be able to superior get ready to be certain the standard of your products, within the detection of PCB board, we should focus on the following nine strategies.
1. Inside the absence of isolation transformer, it can be strictly prohibited to utilize grounded examination tools to speak to Tv set, audio, video as well as other tools with are living base plate to detect PCB board
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It is strictly prohibited to straight check the Tv set, audio, video clip and other products without the need of ability source isolation transformer with grounded machines. Though typically the recorder has power transformer, when subjected to a unique particularly or larger output electricity on the mother nature on the electrical power supply usually do not know a great deal about Tv or stereo machines, very first clarify the machine chassis is billed, or else incredibly quick and flooring dwell Tv set, audio along with other tools electricity provide circuit, spread into the built-in circuit, additional breakdowns.
2. Be aware of the insulation general performance of electrical soldering iron when screening PCB board
It is not allowed to utilize the soldering iron, to make guaranteed which the soldering iron isn't billed, it really is improved to floor the soldering iron shell, be much more careful to MOS circuit, can use 6~8V low-voltage circuit iron is more risk-free.
three. Recognize the operating theory of integrated circuit and linked circuits prior to detecting PCB board
Right before inspecting and restoring an IC, it is actually essential to generally be familiar along with the perform of your IC used, inner circuit, principal electrical parameters, purpose of each pin, normal voltage in the pin, waveform and dealing theory of the circuit composed of peripheral components. Should you have these circumstances, then the evaluation and inspection are going to be much much easier.
4. Test the PCB board to avoid short circuit concerning pins
When measuring voltage or measuring waveform with oscilloscope probe, the stylus or probe mustn't result in limited circuit between IC pins thanks to sliding. It is better to measure about the peripheral printed circuit instantly related while using the pins. Any momentary shorter circuit can easily hurt the IC, specially when screening flat encapsulated CMOS IC.
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five. The inner resistance of PCB board test instrument should be significant
Dc voltage measurement IC pin, really should choose header |? resistance is greater than 20 k/V multimeter, or for a few pin voltage can have much larger error of measurement.
6. Heat dissipation of ability integrated circuit need to be paid attention to when detecting PCB board
The power built-in circuit must have very good warmth dissipation, and it's not permitted to do the job inside the state of higher power with no heat sink.
seven. PCB board direct detection need to be acceptable
If it is important to add peripheral components to exchange the damaged aspect inside the IC, small components should be picked, along with the wiring needs to be fair to prevent unnecessary parasitic coupling, primarily to manage the ground end in between the AUDIO amplifier IC as well as preamplifier circuit.
8. Test PCB board to ensure welding top quality
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When welding is really robust, the accumulation of solder, pores simple to trigger virtual welding. Welding time usually doesn't exceed three seconds, the ability of your soldering iron really should be about 25W. The integrated circuit has been welded to meticulously check out, had improved use ohmmeter measurement between the pin brief circuit, ensure no solder adhesion phenomenon prior to switching over the electric power.
nine, test PCB board do not quickly choose the problems of built-in circuit
Tend not to choose very easily the integrated circuit is damaged. As the overwhelming majority of integrated circuits are right coupled, when a circuit will not be normal, it might cause a number of voltage variations, and these alterations are not necessarily triggered by destruction towards the Integrated circuit. In addition, in some situations, in the event the measured voltage of each pin is in keeping with or near to the normal value, it could not usually reveal that the built-in circuit is nice. Some smooth faults usually do not induce a transform in dc voltage.
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