For the chip crystal oscillator, unlike the resistor capacitor chip, the quartz chip is sealed and protected internally, so it is more resistant to drop compared to the plug-in.

How to clean the crystal oscillator. The electronic market's requirements for quartz crystal oscillators are smaller and thinner, so it is conceivable that the internal chips will also be smaller and thinner. The frequency of the crystal oscillator product is similar to that of the ultrasonic cleaner, so it will resonate and cause damage to the small and thin quartz chip. Therefore, the use of ultrasonic cleaners to clean the crystal oscillator should be reduced as much as possible.

If you want an ultrasonic cleaner to clean the crystal oscillator, unless you can grasp that the two frequencies are different, don't let the two resonate and cause breakage. So we talked about what small links we need to pay attention to when welding quartz crystal resonators.

1. Some factories will weld the shell of the 32.768K crystal oscillator on the board to shield the interference caused by the signal. As a result, the soldering time of the crystal oscillator is too long, which melts the solder joints inside the crystal oscillator, and the internal structure chip tilts against the shell and short-circuits. The crystal oscillator chip is floating inside the quartz crystal oscillator. The best way is to have two pin holes on the PCB and use copper wires to bundle the crystal oscillator. Or use a rubber adhesive. The premise is that it does not affect the normal operation of other components on the circuit board.

2. Most of the 32.768K cylindrical crystals purchased by customers, or cylindrical crystals of other frequencies, want to be used as bent-leg crystals. Because the price of curved-leg cylindrical crystals on the market is too far from that of ordinary cylindrical crystals, people directly purchase cylindrical crystals and require workers to process them. Here, I need to remind that the best bend of a cylindrical crystal is to pinch the shell of the cylindrical crystal with your fingers, use tweezers to clamp the lead 3mm above the bottom of the crystal base, and use tweezers to clamp the bent lead to 90 degrees. Don't pull the lead forcefully. Pulling the lead wire forcefully may cause the glass at the root of the lead wire to break, resulting in air leakage and damage to electrical performance. If the air leaks, the quartz crystal oscillator will basically be scrapped and cannot be used.

Usually, we think that the reason why the crystal oscillator cannot vibrate may be that the welding method is incorrect, or the crystal oscillator has been dropped before it goes online. From a design perspective, if the Seiko crystal oscillator falls from a height of 75cm onto a hard wood board three times, it is not according to the design. What problems will arise? Well-known brands of Japanese products are the same. For example, Epson crystals, Citizen crystals, KDS crystals, and Murata crystals all have the same characteristics. But why do we need to prevent the crystal oscillator from falling from time to time. Because it varies according to different conditions and factors, as well as the material and chip selected by the manufacturer, the quartz chip inside the crystal oscillator may be damaged. Resulting in the inability to start vibrating normally.