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Danno Hi, I have the same version. The 2 pads labeled 'KEY' are in parallel with the push button switch. I assume that's so you can connect your own remote switch (maybe foot-operated) to use instead of the push button if you want. They provided 2 pads for an LED but didn't install it and didn't provide one in the kit. Watch the video on u tube ( watch?v=PB0znkuYR7Y&feature=emb_logo ) and you can see what the LED is used for. Since there's a piezoelectric speaker included, you don't have to have the LED since either one will indicate what mode the welder is in. Note that they incorrectly printed a symbol for a quartz crystal in the location where the electrolytic capacitor goes. Also note that they marked the positive pad for the capacitor. The capacitor positive lead is the longer one. The negative lead is shorter and is marked by a dashed stripe along the side of the capacitor.

2021-01-09 03:34:53 Helpful (0)
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cpassuel Thereis no firmware update for this, however there is a mod to change firmware but you need to replace the MCU. Search Reverse engineering FNIRSI-5012H on Google (cannot put links in answer)

2020-12-06 04:29:58 Helpful (0)
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Q: Can I change the shape of this foam with a heat gun? Like EVA foam?

Asked by Snowandcakes on 2018-08-02 04:18:35

cpassuel Ididn't try but I don't think so. You can cut it

2020-08-29 05:31:30 Helpful (0)
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cpassuel Probably the micro controler, you can replace it but you will have to upload the program into (not sure it's open source) with an arduino. The tester is cheap os it's easier to buy a new one

2020-07-14 12:10:34 Helpful (0)
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