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I can not figure what the white colored component labeled "5W3K9J" is. The "3K" part seems to indicate a 3K resistor. Could some one please verify this?

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It's a wirewound resistor and the breakdown would be:

  • 5W is the power rating
  • 3K9 indicates a 3.9 kΩ resistance
  • J is the 5% tolerance code, see this Wikipedia table
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5W is the power rating - 5 watts

3K9 is the value - 3900 Ω

J is a tolerance indicator - ±5%

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