PCB board selection of lead-free spray tin and lead spray tin difference: 1, lead-free spray tin belongs to environmental protection process, does not contain harmful substances "lead", the melting point is about 218 degrees; 2, lead spray tin d...
Before SMT proofing, PCB should test: 1. PCB light plate deformation, surface smooth; 2. 2. Whether there is oxidation on the circuit board welding plate; 3. Whether the copper coating on the circuit board is exposed; 4. Whether the PCB has been baked for
In order to ensure the smooth completion of the special process and facilitate the PCBA welding process, PCB board must meet the manufacturability requirements in dimensions, pad distance and other aspects
PCBA circuit board debugging steps and methods: 1. Board surface observation and resistance inspection, 2. Install components, 3. Detect the output voltage of the power supply, 4. Preset overcurrent protection current, 5. Install other modules and power t
PCBA machining functional test process: 1. Functional test plan, 2. Test points, 3. System programming, 4. Test fixture
Accurate and reliable rework is more difficult in lead-free environments because the PCBA and the component closest to the component to be serviced must withstand multiple high temperature cycles. To protect the stability of the board, the preheating temp
What is the warm-up to PCBA welding: When technicians and practitioners hear the words "temperature curve" or "temperature curve", they think of smt reflow soldering. Along the vast length of the weld zone, it is easy to see the four m...
Factors that determine perfect wave soldering in PCBA processing include: 1. Stable complete contact; 2. heat
To ensure service quality, we will check all SMT processing and DIP welding processes :1. PCB factory inspection,2. High temperature baking before production,3. 3D AOI solder paste printing inspection,4. Optimal cost accounting,5. Technical feasibility st
Test methods that can be used to identify counterfeit electronic parts in routine operations: first, visual inspection, second, electrical testing, third, X-ray inspection, fourth, XRF technology
When PCBA is processed in the furnace: Because the pin of the plug-in element is scour by tin flow, some plug-in elements will be tilted after welding in the furnace, resulting in the element body beyond the screen frame, so it is required to repair weldi
General items to be checked after PCB wiring include: General PCB design drawing check items, PCB physical characteristics, PCB installation requirements, PCB electrical characteristics, PCB mechanical design factors, PCB removal requirements, PCB electri
