Quick turn PCB assembly (I)

According to the maintenance and analysis experience of China quick turn PCB assembly, we divide quick turn PCB assembly into several categories, specifically as follows:

1. Visual method of quick turn PCB assembly

Visual is the basis of all maintenance, a bad PCBA hand, will carry out a quick turn PCB assembly appearance inspection, to see whether there is broken line, open, short, cold welding, missing parts, multiple pieces, wrong parts, kneeling feet, parts displacement, anti-white, deformation or burned and other factors.

2. Quick turn PCB assembly comparison method

The comparison method of quick turn PCB assembly is also a means of maintenance commonly used in china quick turn pcb assembly factories.

3. Quick turn PCB assembly touch method

The quick turn PCB assembly touch method is also called the temperature sensing method, that is, to directly feel the temperature of the chip set or additional components on the PCBA board, and intuitively judge whether the PCBA board of china quick turn pcb assembly suppliers works correctly.

There are various maintenance and analysis methods for PCBA boards. China quick turn pcb assembly factories can not only master the various maintenance and analysis methods, but also flexibly learn and apply them.

Quick turn PCB assembly mode (II)

In the last article, we have temporarily learned several ways for China quick turn pcb assembly suppliers, and the relevant ways will be introduced in the following.

1.  China quick turn pcb assembly suppliers hand pressure method

When quick turn pcb assembly suppliers fix some broken PCBA boards, there may be some problems that cannot be measured when measuring the signal. At this point, we can manually press some chips onto the PCBA board, mainly BGA closed components, and observe what happens. quick turn pcb assembly suppliers manual pressing method mainly applies to cold welding or tin cracks and other undesirable phenomena.

2. China quick turn pcb assembly suppliers open circuit law

The open-circuit method of pcb assembly suppliers in quick turn is a common method to measure the resistance value of PCBA board components. The open-circuit method refers to disconnecting the line and inspecting it separately. It is normally used to judge cold welding, open circuit, short circuit of some parts or too large or too tiny resistance value of a point.

3. China quick turn PCB assembly suppliers decontamination method

Quick turn PCB assembly suppliers of decontamination method is to point to get rid of the dirt, PCBA board can be visual, look have other sundry wuxi slag, avoid post-production create problems.

4. Replacement method of China quick turn pcb assembly factories

The replacement method of quick turn pcb assembly factories refers to the maintenance method adopted when the resistance, voltage and waveform measurements are invalid, because not every defective pcba board can be visually detected with a detection tool.

Quick turn pcb assembly design tips

1. 1. Choose the right quick turn pcb assembly board.

2. 2. Reasonably avoid high-frequency interference from quick turn pcb assembly.

3. 3. Solve the problem of signal integrity in the design of high-speed quick turn pcb assembly.

4. 4. Quick turn pcb assembly differential signal line can not add ground wire in the middle.

5. 5. In quick turn pcb assembly, add the ground wire on both sides of the clockwise according to the situation.

6. 6. Quick turn pcb assembly allegro wiring appeared a section of line segment according to the command can be completed.

7. 7. Try to meet EMC requirements in quick turn pcb assembly.

8. 8. Design quick turn pcb assembly with high frequency above 2G and extract transmission line parameters with the help of 3D field analysis tools.

9. 9. Quick turn pcb assembly AC coupling installation specific analysis.
   
   

Switching power supply quick turn pcb assembly wiring points

At present, the speed of electronic products upgrading is very rapid. quick turn pcb assembly product design engineers are more inclined to choose AC/DC adapter which is easily purchased in the market, and install multiple sets of DC power directly on the circuit board of the system.  Let us take a look at the wiring points of the quick turn pcb assembly of the switching power supply.

1. Quick turn pcb assembly bypass capacitor capacitance can not be too large, and its parasitic series induction as tiny as possible, multiple capacitors in parallel can improve the impedance characteristics of the capacitor.

2. In quick turn pcb assembly, the parasitic parallel capacitance of inductor should be as tiny as possible, and the distance between the welding pad of inductor pin should be as long as possible.

3. Avoid placing any power or signal wiring on the formation.

4. The area of the high-frequency loop should be reduced as much as possible.

5. Over hole placement should not destroy the path of elevated frequency current on the formation.

6. A short circuit on the system board of the quick turn pcb assembly needs a different connection stratum, and the connection stratum of the tiny connection circuit is connected with the power supply connection stratum through a single point.

7. Quick turn pcb assembly control chip to the upper and lower end of the field effect tube drive circuit loop should be as short as possible.

8. switching power supply quick turn pcb assembly power circuit and control signal circuit components need to be connected to the minor ground layer, The two layers are typically connected through a single point.

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