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[Help]familiar with SMD rework station?

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3ddown

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Good day!I need help why i cannot adjust the heater part of the hotair.adjusting the potentiometer to its minimum will not give any heat.any point above minimum setting will turn the hotair to maximum heat and the LED flashes very fast.ive removed ang tested the potentiometer and it gives me a varrying resistance.how does this system works?TIA
 

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