[ Date Time : 2015-4-24 ] [ Comments : 0
When a piece of circuit board layout, and check the connectivity and spacing are without error, is a piece of circuit board is completed?Of course, the answer is no.
Many beginners also includes some experienced engineers, due to time tight or impatient or too confident, hurry, often ignore the later check.Results there have been some very basic bugs, such as line width is not enough, component label printing pressure in a hole, socket too close, signals in the loop, and so on.Leading to electrical problems or technical problems, serious to re plate, resulting in a waste of. So, when a piece of circuit board to complete the layout, a very important step is later checked.
Circuit board inspection of many details, STG PCB processing plant lists some think the most basic and the most error prone factors, as a late check.
1, packaging components
(1) welding plate spacing.If it is a new device, painting protel to yourself and ensure spacing, appropriate welding plate spacing directly affect the components of welding.
(2) the size of the hole (if any). The plug-in device, hole size should retain sufficient margin, generally not less than 0.2mm is suitable to retain.
(3) the profile screen printing.Device screen printing the most like the outline of the actual size is larger, the device can be installed smoothly.
2, the layout
(1) IC should not be close to the edge.
(2) should be put close to the same module circuit device.The power of the decoupling capacitors should be close to the IC feet, for example, of the same function of the circuit device priority placed on an area, distinct, guarantee the realization of the function.