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| HAKKO FR-301 desoldering tool |
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| yamhill:
I just ordered a 301 from Japan and plan to use a transformer to adjust the voltage for use in the USA. I'm curious, for those that can better discern the workings of the FR301 control board, from the picture -- with the pen marks for the voltage -- I'm wondering how many thing change on the board or in the whole unit with the "pen mark". |
| rsjsouza:
I suspect that R16/R17 should be changed to something slightly higher to avoid stressing C2 with overvoltage - maybe a pair of 20 or 22kΩ. Also, as someone else hinted here, R20 might require a 20% increase. I can't tell what the box capacitor C15 is doing, but if it is stepping down voltage, it might also require change to increase its reactance. Naturally, that assumes the pump connected to CN7/CN8 is actually after a voltage limiting device. Otherwise, it will be subjected to overvoltage. One thing I know is the pump works with the heater unpowered. |
| Logg:
--- Quote from: rsjsouza on April 12, 2024, 10:08:41 am ---I suspect that R16/R17 should be changed to something slightly higher to avoid stressing C2 with overvoltage - maybe a pair of 20 or 22kΩ. Also, as someone else hinted here, R20 might require a 20% increase. I can't tell what the box capacitor C15 is doing, but if it is stepping down voltage, it might also require change to increase its reactance. Naturally, that assumes the pump connected to CN7/CN8 is actually after a voltage limiting device. Otherwise, it will be subjected to overvoltage. One thing I know is the pump works with the heater unpowered. --- End quote --- I did a lot of research, bought both the Japanese & North American circuit boards to compare them, and wrote up a tutorial on how to convert the Japanese FR301-82 for North America 120VAC here. It turns out that Hakko didn't design any difference on the board to additionally limit current to the heater in North America. They have a different part number for the Heater Element, but they have identical resistance and most likely are extremely similar or the same. By the way, as far as I can tell, C15 in combination with R12 forms an RC filter whose purpose is to smooth out voltage spikes & transient disturbances, providing cleaner power to the tool. It doesn't do any voltage transformation. |
| rsjsouza:
This is great info! Thanks for goong through the exercise of the conversion |
| def45:
has anyone measured the tip temperature on the Japanese and U.S. irons on full power running on 120volts without any transformers or adjustments? |
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