If the power supply is normal, which is usually programmed to synchronize micro motor damage caused. Demolition of the cover, press the power button, the block with a multimeter to measure AC voltage between 10 feet and 16 feet controller resistance is ∞, good synchronization micro motor resistance value is about 9.5kΩ, conclude synchronous micro motor windings open. Should normally be replaced, but the original micro-motors are expensive and hard to find, I tried to pry open its cover and winding protection home and found a

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