Welding sequence

Assembly welding sequence
When welding and inserting the components, the identification of the components should be guaranteed to be easy to identify, and the mounting parties of the components on the printed circuit board should be ensured.
The components with polarity shall be installed in the direction required by the drawings in the direction which shall conform to the printed circuit board.
Unless otherwise required, the order of assembly and welding of components is from left to right, from top to bottom, first inside, first outside, then small
Large, low, high, light, heavy, heat-resistant and non-heat-resistant components, followed by special components, complete with the same specification
After the installation of another specification, and after the installation of a previous process can not affect the installation of the next process. Like sequence of assembly and welding
The order is resistance, capacitance, diode,
The transistor integrated circuit, high power transistor and so on, if have the special request, should according to the corresponding
The rules are enforced. India village electric appliance after welding
The components on the road board shall be evenly distributed and arranged neatly and aesthetically.
The space arrangement is limited, does not allow the oblique row, the three-dimensional crossover and the heavy body arrangement, the same US component height Lin Benjing
Attention should be paid to the character marker side when inserting
Read out from left to right as far as possible. This welding device
The model, size, etc., are easier to read.
Zhouxin requests that the resistor be given a position, and the color ring of the electric victory should be in one direction in order to make it convenient to catch the human color ring.
Read. Arrangement of resistive Coal in Colour Ring
Direction as shown in Fig. 2.6.2: colour ring resistance when horizontal insertion is used. Resistance is required.
The root ring is located on the right side of the printed circuit board or below: if vertical insertion is used, the post-resistance ring should be printed near the house
The circuit board. Then there is the welding resistance, which will be exposed to printed electricity when the resistance is as high and low as possible.
Polar components such as electrolytic capacitors, diodes, transistors and integrated circuits must be inserted in strict accordance with the
Require the loader to specify the position, and pay attention to the positive and negative electrode of the unipole and electrolytic capacitor, the E.B.C tripole of the Triode can not be connected
Wrong, the type, direction, nominal value of polar components after welding must be clearly visible.
The power resistance height should maintain the 24mm distance interpolation with the board. Varistor to distance from board to 25mm left
Right, and maintain horizontal or vertical state of interpolation. The resistance above 31W shall be suspended and inserted into the lead of the suspended part.
To secure the lead. The pin and power modules should be pressed flat with the board and not tilted. The welding height of the straight insertion Triode is
The 10mm left and right patch transistor pin should be located in the center of the pad and should be flat and straight. Triode and above 1500 V
When the electrolytic capacitance is inserted, the insulation pad should be cushioned at the bottom of the capacitor.
Do not touch the lead wire of the device or the copper box on the printed circuit board by hand when inserting to avoid corrosion on the hand
Lead wire and copper case. After manual welding intercalation, the gloved hand can be used to wire the welding face