Disassembly and Assembly Process of MOS Tube

1、 What should be paid attention to in the disassembly and assembly of MOS tube.? Adjust the temperature of the air gun to 320 ° C and the wind speed is grade 1. The MOS tube belongs to a small glass tube. Easy to crack, so be careful when removing. When prying, the force must be light. The surrounding components shall not be touched. If there is a chip with glue, it needs to be avoided. The stroke gun cannot stay too long during blowing

2、 Use a sharper blade when prying the MOS tube. Put the blade under the MOS tube. Use your fingers to push up a little. The wind gun kept blowing at me. When the tin just melts, the MOS tube will fall off naturally

3、 MOS tube belongs to chip with glue. When prying off, the mainboard needs to be degummed. Be careful not to use too much force when removing glue. Otherwise it will fall. Remove the glue and scrape it gently with the tip of tweezers. Or scrape the glue with a beveled knife. Clean all the glue on the main board pad.

4、 Put a small amount of welding oil and drag the pad evenly with a soldering iron. There should be no obvious ups and downs. Clean the pad with plate washing water

5、 Chip degumming. Just scrape the small chip with the tip of a soldering iron

6、 Tin planting is also required for MOS removal. Use a paper towel to suck up the excess solder paste on the tin scraper (dry it as much as possible), clean the tin planting net (there shall be no foreign matter in each small hole), lay the MOS tube on a paper towel and align it with the tin planting net

Apply solder paste on it, wipe it evenly, wipe it back and forth with a dust-free cloth, adjust the air gun to 280 °, turn off all the wind speed, and slowly move the mouth of the air gun on the tin planting net from far to in. Be careful when removing after planting tin. Use tweezers to gently push the tin bead from top to bottom. Put a small amount of welding oil when removing. Blow with a wind gun until all the tin beads return

7、 The MOS tube is installed with a pin. There is a small point on the back of the MOS tube, called the first pin. You need to look at the direction when removing it. If you forget what to do, find a board to compare. No board can find the direction in the drawing or tag number drawing,

8、 Put a small amount of welding oil on the bonding pad. Too much welding oil will shift. Clamp the MOS tube onto the main board to be welded with tweezers and set the direction. The temperature of the air gun is also 320 ° C and the wind speed is 1. Aim at the MOS tube and blow welding for 15 seconds. Gently touch it with tweezers after the tin bead melts. The MOS tube will automatically reset, indicating that it has been welded.

9、 After the main board is cold, clean the main board with plate washing water

Disassembly and Assembly Process of MOS Tube 1

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