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To prepare the heated bed you should "tin" the 10 pads on the bottom of the heated bed. For the smaller pads on the bed, you should be careful not to heat the pads too hot for too long as this can cause the pad/trace to lift from the board.
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Solder the resistor to the heated bed.
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Solder the LED to the heated bed. NOTE the polarity of the LED in the picture. The short leg is the - and the long is the +
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You can cut the excess resistor and LED leads after you have soldered it to the bed.
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Separate the legs of the thermistor as shown and insert the glass bead of the thermistor into the hole in the center of the heated bed. Solder them to the top two pads on the heated bed.
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You can cut the excess leads after you have soldered it to the bed.
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