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Question
Embedded access control all-in-one CHD803M in the north winter swipe card close?
As the temperature of embedded all-in-one machine decreases, the inductance suddenly changes significantly at about negative 20 degrees, resulting in a close swiping distance.
The Solution: Remove the original capacitor of CF3 and replace it with a 2200PF capacitor. At the same time, remove the capacitor of CF1.
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