PCBA processing using expired PCB board three hazards: 1, PCBA processing using expired PCB may cause oxidation of PCB surface welding pad, 2, PCBA processing using expired PCB may cause moisture absorption and burst board, 3, PCBA processing using expire
The importance of PCBA processing plant to select the SMT placing machine is as follows: first, the type of components that can be affixed, second, the adjustment of the placing machine
SMT surface mount technology has the following 5 steps: 1. PCB production - this is the actual production stage of PCB with solder points; 2. Deposit solder on the pad to fix the assembly to the plate; 3. With the help of the machine, the components are p
The reasons for the formation of tin beads in PCBA processing: 1. When the PCB board leaves the liquid solder, it is very easy to form tin beads, 2. The second reason for the formation of tin beads is the release of volatile substances in PCB board and so
Shielding method in high frequency PCB design: the twisted pair in data twisted pair can resist external interference and cross-talk between pairs through its own twisting at low frequency, but at high frequency, only twisting and merging can not achieve
Circuit board components testing skills: 1. Measure the polarity of each foot of the rectifier bridge, 2. Judge the quality of crystal vibration, 3. Unidirectional thyristor detection, 4. Polarity recognition of bidirectional thyristors, 5. Check the qual
Take a look at the PCBA OEM classification: 1. Technology-oriented, 2. Processing-oriented
What is the cause of PCB board broken line: 1, film process: 2, exposure process: 3, development process: 4, etching process: 5, electroplating problem: 6, improper operation
PCB board temperature resistance test method: In order to ensure the quality of PCB board, it is necessary to carry out temperature resistance test, usually the highest temperature resistance of PCB board is 300 degrees, 5-10 seconds; Over lead-free wave
PCB surface treatment process is identified by color: 1, gold, 2, silver, 3, light red
he system speed can be greatly reduced because of the increase of delay time caused by the delay of 2ns per 30cm line length of the common interconnect on the baseboard. Image shift register synchronization counter.
PCBA processing common adverse phenomena: 1, warping, 2, short circuit, 3, offset, 4, missing parts, 5, air welding
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