DC power supply production
2, DC power supply welding
According to the map to check, correct and then welding. In order to ensure reliable and does not damage the printed board, pay special attention to control the welding time to control the temperature of the soldering iron, to prevent Weld and copper foil stripping.
(3) lead wire shaping of electronic components
When the electronic components are mounted on the circuit board, the pins of the components must be shaped in advance to accommodate the needs of the circuit installation. The lead forming of electronic components is mainly to make the installation of components to meet the size of the components on the printed circuit board mounting hole size requirements.
(4) electronic components of the plug method
① the order of the pack: the first low after the high, the first small after the big first heavy light.
② identification of components: electronic components of the mark and color code should be up, in order to identify; horizontal plug-in numerical reading should be from left to right, and vertical plug-in numerical reading should be from the bottom up.
③ the spacing of components
The distance between the components on the printed circuit board can not be less than 1mm; lead spacing is greater than 2mm. General components should be installed closely, so that components attached to the printed circuit board.
Components meet the following circumstances should not be closely mounted, and need to float:
A, axial lead need to be vertically inserted: the general components from the printed circuit board 3 ~ 7mm;
B, large heat of the components (high power resistors, high power tube, etc.);
C, heat after the performance of vulnerable devices (such as manifold blocks, etc.);
④ pay attention to the polarity of the diode, integrated circuit, electrolytic capacitor
The circuit board due to fewer components, components of the installation order: diodes, resistors, potentiometers, electrolytic capacitors, electrolytic capacitors, integrated circuits in the order of installation.
Before installation, pay attention to whether the component pin oxidation, the oxidation of serious components to be processed and tin.
1, DC power supply installation
(1) preparation before installation
① check the quality of the printed circuit board;
② all components must be tested before installation;
③ handle the soldering iron to do the preparation of welding.
(2) the detection of components
First control the principle of circuit diagram, read the printed circuit diagram. The components of the circuit diagram and physical components for comparison, understanding of physical components. And then the components to detect.
① control the principle of the circuit, list the components list. Draw a list of components.
② check the test resistance, capacitance parameters. Test the Capacitance of Small Capacitors with a Digital Multimeter. There are no special requirements for resistors and capacitors in this circuit.
③ check the potentiometer is intact.
