6.11.3 Removing and Welding Shielded Enclosures

6.11.3.1 Disassembly temperature: According to the Reference Standard for Welding Temperature of Various Types of Components, the temperature of the heat gun should be 340℃ ~ 380℃, and the temperature of the heating table should be 200℃ ~ 220℃

6.11.3.2 Requirements for removing a small shielded frame: Firstly, select the appropriate heat gun nozzle and removal method according to the size of the shielded frame to be removed. The small shielded frame can be removed as a whole. First, use a heating table to auxiliary heating the bottom, and then add a small amount of flux to each pin of the shielded frame. Heat the heat gun back and forth on the whole pins of the shielding frame at a vertical distance of 2 to 3cm. Remove the heat gun after the solder of all the pins of the shielding frame melts.

6.11.3.3 Requirements for Removing a Large Subrack: Because it is difficult to remove the large shielding frame as a whole, we can choose the method of local warping and disassembly. First of all, we choose the corresponding hot air gun nozzle according to the size of the shielding frame to be removed, use the heating table for auxiliary heating at the bottom, and then add a small amount of flux to each pin of the shielding frame. Heat the nozzle of the hot air gun at a vertical distance of 2 to 3cm to the shield frame pin. After the solder melts, use tweezers to lift the nozzle until the whole shield frame becomes warped.

6.11.3.4 Welding temperature: According to the Reference Standard for Welding Temperature of Various Types of Components, the temperature of the heat gun is 340℃ ~ 380℃, and the temperature of the heating table is 200℃ ~ 220℃

6.11.3.5 Welding Requirements for shielding frames; Check whether the shielding frame is deformed, choose the corresponding air gun nozzle according to the size of the shielding frame to be welded, use the heating table to auxiliary heating at the bottom, add a small amount of flux on the pad, if the solder on the pad is insufficient, use the electric soldering iron to add a little solder on the pad. Also can point a little tin paste. Align the shielding frame with the pad. Heat the hot air gun at a vertical distance of 2 to 3cm to heat the pins around the shielding frame back and forth. When heating, you can use tweezers to gently press the shielding frame, straight

Tin to the pin of the screen frame.

6.11.3.6 Precautions for disassembly and welding: Pay attention to the protection of surrounding components, especially plastic components, and do not blow out or deformation. After component maintenance, there can be no discoloration, burning and burning, to ensure the weldability of the maintenance yuan, the maintenance area and surrounding components can not have displacement, fake welding, even tin and other bad phenomena, the back can not have the existing wipe plate, missing parts, displacement and other phenomena.

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