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Watch size: dial diameter * thickness * total length (CM) 4.6 * 1.68 * 24.5cm (centimeters) [Product Introduction] Working principle of electronic watch: Power supply - Crystal oscillation generates 32768Hz frequency - Frequency division - Rectification - Filtering - Analog to digital conversion - Output Electronic components Non directional components (passive components): Resistance: Unit: Ohm Capacitor: Unit: Farad Inductance: Unit: Hen Directional devices (active devices): electrolytic capacitors, diodes, transistors, buzzers Movement structure: power (battery) part, PCB, components, rubber cover, hardware Testing requirements: Testing environment, equipment, and methods. Accuracy, working current, static current, and functionality. (Service life) Production process: PCB ->COB ->Soldering ->Testing ->EL sheet ->LCD ->Cover ->Upper board (upper hardware sheet) ->Testing ->Upper battery ->Functional testing ->Applying battery stickers. Common troubleshooting: Whiteboard: 1. Check if the battery is charged. If it is not, replace the battery; If there is power, short circuit the AC point of the movement. 2. If the battery is charged and short circuited, repair the PCB. Broken characters (missing strokes): 1. It may be due to loose screws, just tighten the screws; 2. There is dirt on the barge, just reinstall and remove the dirt; 3. LCD or PCB is damaged, replace the above components. Press the flashing light or no text: 1. The battery is dead, replace the battery; 2. The battery voltage is normal, flashing according to the light symbol indicates light interference, increasing the interference capacitance;