Its pins are simple: pin 1, pin 2 and pin 3 are operational amplifier channels, pin 1 is an output terminal, pin 2 is an inverting input terminal, and pin 3 is a non-inverting input terminal; Pins 5, 6 and 7 are another operational amplifier channel, pin 7 is the output terminal, pin 6 is the inverting input terminal, and pin 5 is the noninverting input terminal; Pin 8 is a positive power supply; The fourth pin is negative power supply (when dual power supply works) or ground (when single power supply works).
Failure analysis of high voltage capacitor pin fracture;
Environmental stress screening test is a necessary means to evaluate missile quality. The random vibration test in ESS test aims to check the defects of products in structure, assembly and stress. In the production process, the missile must pass the environmental stress test of components, cabin and whole missile.
In the 3-level vibration test, the fault phenomenon of transmitter detecting power jitter or low power appears many times. After investigation, it was found that the pin of high voltage capacitor on the rectifier circuit board of transmitter assembly was broken at the solder joint.
There are 10 ceramic high-voltage capacitors on the rectifier circuit board (which play the role of voltage doubling or filtering in the circuit). Silver-plated electrodes on both sides are welded with 1 1 mm silver-plated copper wire, then inserted on the printed board, and the bottom surface of capacitor ceramics is less than 0.5 mm away from the printed board, and then welded with an electric soldering iron. Finally, coat 1 coil silicone rubber GD4 14 on the bottom of the capacitor.