Welcome to visit our website, Safe De Technology !

15 years on precision PCB One of leading manufacturers for PCB in China

About Safe-de
                                                     


Shenzhen Safe De Technology Co., Ltd. is the representative of technological innovation for PCB factory. The products are widely used in communication, power supply, security, optoelectronics, industrial control, medical, automotive and consumer electronics. The Jiangxi base is mainly engaged in the production of IC carrier boards, multi-layer multi-level HDI, any interconnected HDI, multi-layer through-hole.. ... More

》》Application range

》》Application range

Mobile phone, communication, POS Tablet, car, medical, aviation Office equipment, industrial control, etc.

》》Technical Skills

》》Technical Skills

Minimum PCB thickness (12-layer HDI): 0.7mm; Minimum hole ring: 0.06mm; Welding tolerance: +-0.02; Base copper 1/4 oz: 0.03/0.03mm

产品中心 Product Center


Wechat Scan

Tel:86-755-23290283

Fax:86-755-23290282

E-mail:tomgao@safe-de.com


More+

New products

  Trusted by hundreds of companies 

    Custom PCB consistently choose us


FAQ

Flexible printed circuit board defect detection method guide
cause of issue
The printed board is faulty.
 
Troubleshooting
1, connect the diagnostic instrument VAS6160A, read the fault code:
 
P150A00 ignition switch off duration signal, not credible;
 
Valve 1 in P173E00 sub-transmission 1 Electrical fault;
 
The VAG02616 fuel tank cap is unlocked;
 
VAG02615 fuel tank cap is locked;
 
U111300 has limited functionality due to the receipt of incorrect values;
 
VAG02856 Control unit 2 sensor range is blocked.
 
2. According to the fault code and fault phenomenon analysis: the valve 1 gas fault of P173E00 sub-transmission 1 is the main problem of the car, and the remaining fault codes are ignored. Let us first look at the installation position and basic working principle of the sub-transmission valve 1.


Reaction principle of making printed circuit boards by etching
The reaction principle can be expressed by the equation of reaction of FeCl3 solution with metallic Cu: 2FeCl3 + Cu == 2FeCl2 + CuCl2;
Although iron is more active than copper, it can replace metallic copper from copper sulfate solution, and it produces ferrous sulfate itself. However, ferric iron has stronger oxidation than divalent copper, so metallic copper can react with ferric iron. The printed circuit board is provided with a thin layer of copper plate on one side of the composite material board. When the circuit is printed, the circuit part is printed on the side of the copper plate with anti-corrosion paint, and is placed in the ferric chloride solution without copper printed on the coating. It is eroded and only the circuit part is left.


There is a problem with the printed circuit board. How do you diagnose it?
Printed circuit, the board is abbreviated as PCB, also known as printed circuit board. It is an important electronic component, a support for electronic components, and a carrier for electrical connection of electronic components. Because it is made by electronic printing, it is called a "printing" circuit board.
 
The application of printed circuit boards began in 1936 and was first applied to radio installations, which began to be used on a large scale in the 1950s. After more than 80 years of development, PCB products have been widely used in various terminal fields of the electronics industry, such as consumer electronics, automotive electronics, communication terminals, medical equipment, industrial equipment, aerospace, military and other fields.
 
The soldering operation of printed circuit boards always has the problem of bad solder joints, and this kind of problem has been endless. It seems that there will always be new problems.


20 common problems in PCB circuit board printing
In the screen printing process of the board, it can be divided into 9 parts and 56 variables, which requires everyone to have the correct operating procedures or the following phenomenon.
 
No matter how the screen is pulled, it can't be evenly stretched, or it often bursts.
 
The mesh and the frame are not firmly adhered, dry or slow.
 
On the screen, the 110 mesh cloth is easy to fall off, or it will burst automatically, and it will burst or fall off during drying.
 
There are many meshes or translucent meshes on the template.
 
There are jagged edges on the image on the template.
 
When the template image is flushed, part of it cannot be washed out, or it is completely washed away.
 
The substrate is not aligned with the original film, large or small, up, down, left, and right, with only one side aligned.
 
It is easy to stick to the board during printing, or the image is ambiguous.
 
The image of the line on the template is as if it is not curved.
 
When printing a multilayer PCB board, the number of prints is low and the photoresist is partially peeled off.
 
When printing a multi-layer PCB board, the number of prints is low, the mesh is gradually increased, the glue is lost, the ink is printed, the paste is not printed, and the most serious is the screen burst.
 
The solder mask is peeled off.
 
The solder mask coverage pressure is overdeveloped.
 
The solder mask has air bubbles or wrinkles.
 
The surface of the solder mask is atomized, dark and dull.
 
The text ink is easy to fall off.
 
The text is ambiguous and there are missing prints.
 
The edges of the lines are largely jagged.