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Note

As shown in Figure 12, the DIP switch S4-4 has to be closed if using only 12V single power supply through 12V power jack J25, otherwise the 5V voltage level will not be enabled to generate the 3V3SB voltage to power up the SC CPLD U39 and starting the power-on sequence.
By using the an ATX-24 power connector on J20, there is usually also a 5V supply voltage provided, hence the DIP switch S4-4 is not relevant in this case of power supply.

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