Troubleshooting method of short circuit in PCBA processing
Nowadays, more and more intelligent electronic products, PCBA control board plays an important role in it, and there will be all kinds of problems in PCBA processing, let kinhford Electronic Technology Co., Ltd. to introduce PCBA processing short-circuit troubleshooting method:
First, use short-circuit positioning analyzer to detect faults.https://www.kingfordpcb.com/yuan.php
Second, open the PCB design drawing on the computer, and then light the short-circuit network to see which position is the closest, need to pay special attention to the IC internal short circuit.
Three, if the short circuit is found, it is recommended to take a board secant line, after the secant line, each part of the function block is energized, step by step investigation.
Four, if manual welding, before welding need to visually detect the PCB board, and use a multimeter to check whether the key line short-circuit phenomenon, each time after welding a chip with a multimeter to detect whether the power supply and ground short circuit, and remember not to toss the iron.
Five, for small size of the sticker capacitor must be carefully welded, power filter capacitor is very easy to cause short circuit, it is best to check whether the capacitor is good before welding.
Dual in-line integrated circuit, can use two electric soldering iron, at the same time adding tin to the two rows of pins for simultaneous heating disassembly.
2. Butt welding the next plug-in integrated circuit, the circuit board must be left with solder, resulting in the welding hole is blocked, we generally use a suction gun to clean up the residual welding hole.
3. For the damaged integrated circuit, you can use a sharp tool to cut off the pin of the integrated circuit, and then clean the remaining pin on the circuit board with a soldering iron.
4, in the process of disassembling integrated circuit, need to prepare tweezers, magnifying glass and other tools.
5, the hot air gun can make each welding spot evenly heated, very conducive to the welding and disassembly of integrated circuit.
Two, integrated circuit board production process
1. Print the drawn circuit board with transfer paper, print two circuit boards on a piece of paper, and choose the best printed circuit board.
2, cutting copper clad plate with sensitive plate to make circuit board diagram, copper clad plate, that is, both sides are covered with copper film circuit board, copper clad plate cut into the size of the circuit board, not too large, in order to save materials.
3. Polish off the oxide layer on the surface of the copper coated plate with fine sandpaper to ensure that the carbon powder on the heat transfer paper can be firmly printed on the copper coated plate when transferring the circuit board.
4. Cut the printed circuit board to the appropriate size, paste the printed circuit board on the copper plate, and put the copper plate into the heat transfer machine after alignment, and ensure that the transfer paper is not misplaced.
The above is about the "PCBA processing short circuit troubleshooting method" introduction, hope to have some help to you, more PCBA information please pay attention to the content of the site update! kinhford Electronic Technology Co., Ltd. is a professional PCBA processing enterprise, with fully automatic SMT production line and wave soldering, for you to open the whole production and quality testing process, find us, you belong to have your own electronic processing plant!