Double-layer pcb board is a special circuit board. Generally speaking, the more layers of printed circuit, the more difficult it is to manufacture the PCB. The requirements for its physical properties, precision and technical parameters will increase. Double-layer PCBs are often used in automotive collision avoidance systems, satellite systems, radio systems and other fields. So, do you know what problems you should pay attention to when soldering double-layer PCBs? Next, FS Tech will answer your questions.
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Precautions when soldering double layer pcb
1. SMD ceramic capacitors and Zener diodes in the voltage regulator circuit do not have positive and negative electrodes, while LEDs, tantalum capacitors and electrolytic capacitors need to distinguish between positive and negative electrodes. For capacitor and diode components, generally the clearly marked end should be negative. When FS Technology encapsulates SMD LEDs, it will be positive and negative along the direction of the lamp. For packaged components silk-screened into diode circuit diagrams, the cathode of the diode should be placed at one end of the vertical line.
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For crystal oscillators, passive crystal oscillators generally only have two pins, with no positive and negative poles. Active crystal oscillators generally have four pins. Pay attention to the definition of each pin to avoid soldering mistakes.
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For the soldering of plug-in components, such as power module related components, FSPCBA recommends that you can modify the device pins before soldering. After the components are placed and fixed, the solder is usually melted on the back with a soldering iron, and then the pads are integrated into the front. You don’t have to put too much solder, but the components should be stabilized first.
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PCB design problems found in the welding process, such as installation interference, incorrect pad size design, component packaging errors, etc., should be recorded in time for subsequent improvement.
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After soldering, inspect the solder joints with a magnifying glass to check for virtual soldering and short circuits.
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After the circuit board is soldered, FSPCB will use alcohol and other cleaning agents to clean the surface of the circuit board to prevent the iron filings attached to the surface of the circuit board from short-circuiting the circuit, and at the same time, it can also make the circuit board more clean and beautiful.
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If you have unique insights into soldering double-layer circuit boards, you are welcome to contact FS Tech PCB blog at any time.
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