OSP (Organic Solderability Preservative) is a special chemical coating applied to the surface of copper on a PCB (Printed Circuit Board). This coating forms a thin protective film that keeps the bare copper from rusting or corroding when it’s stored. During PCB assembly, the coating can be ...
Maybe a dry, cracked, or cold solder joint somewhere on the motherboard. Be careful around eyelet joints because of the multi-layers. - 711924
The value of such a capacitor, essentially it’s “spring constant” for the mechanically–minded, is approximated by the formula in Figure 1 when the separation distance between the plates is small relative to their area. It should be noted however, that mechanical spring constants and capacitor...
Shunt Type Ohmmeter, used for measuring small values of current resistance. When the A and B terminals are closed, the needle reads zero because the current flows only through the resistor RX. When these two terminals are opened, there is no current flowing through the RX resistor, thus the ...
1. If a thicker coating is desired, it is best achieved by applying two thinner coats - and the second layer must be allowed to be applied after the first layer is completely dry. 2. When coating the PCB, generally connectors, software sockets, switches, radiators, heat dissipation areas,...
burn a ball before pressing the first point, and the other processes are similar. Pressure welding is a key link in LED packaging technology. The main processes to be monitored are pressure welding gold wire (aluminum wire), arch wire shape, solder joint shape and tensile force. The in-dept...
Base laminate materials, copper foils, solder masks, and component reels are sourced from qualified suppliers to meet specifications. Film patterning A photosensitive dry film is laminated onto copper clad laminate boards and then selectively exposed to UV through custom phototools. This forms a protect...
The pins are placed in a grid pattern (hence the name Ball Grid Array) on the bottom of the integrated circuits. Not only the pins could help connect, pads with balls of solder are also featured with the function of connection. There is a set of cooper pads fitted on the BGA printed ...
Q1. Is it possible to use both wave and reflow soldering on a single PCB assembly? Yes, it is common to use both methods in a mixed technology assembly. First the surface mount devices are soldered using reflow soldering. Then the through hole components are soldered by passing the board...
A rough guess; an estimate or swag. Take a swipe at the answer, even if you're not sure. Wipe To make (a joint, as between pieces of lead pipe), by surrounding the junction with a mass of solder, applied in a plastic condition by means of a rag with which the solder is shaped...