Anyone now how to figure out the coil wiring for detectorpro headhunter underwater model?

[PSS]

Hello, I picked up a detectorpro headhunter pro underwater model detector that someone botched a coil change on and burnt 2 pads and pulled the traces. I have the board repaired but not sure about the wiring. It uses 4 wires 2 white and two blue. It had 2 coils with it. The 12 inch NEL and the 8 inch it is a 2.4 Khz machine. I believe the person removed the 12 inch and was attempting to install the 8 inch. I am planning on putting the 12 inch back on. The board is labeled 1, 2, 3, 4 but none of the wires are labeled in any way. I believe 1 is a blue 2 white 3 blue and 4 white. At least that is how the person had attempted to solder it when they had tried to put the 8 inch on.

this is a guess on my part that

1 is RX A
2 is RX B
3 is TX A
4 is TX B

Like an Excalibur, but that is a guess and I am still looking at 4 unmarked wires other than 2 being blue and 2 being white. I don't want to get it wrong a couple times and then botch my repair up in the process. This is probably not that hard to figure out so thank you for humoring me.

[PSS]

I reached out to Detectorpro, they for whatever reason passed on helping and deflected me to NEL. They did this knowing that NEL is located in the Ukraine and would be unable to help. That response sort of bugs me since they take them in on repairs and would know how to wire the coils they use and be able to figure out the RX and TX off the wires with a voltmeter. I am emailing NEL in support and do not expect support from them.

To NEL and all other Ukrainians, stay strong.

[Skippy]

A pretty reasonable guide is this: Receive coils have higher resistance ( because of greater turns ) than Transmit coils. So TX may be 2 Ohms, RX is 25 Ohms, for example. That would hopefully narrow it down to just four possibilies. All 4 would work ... the two incorrect choices would give a distinctive 'double-blip' on targets. That narrows it down to two likely candidates : there may be distinctions related to ground/shielding, so they both airtest fine, but one option will be noisy over real ground, for example. Only by swapping both TX wires AND both RX wires would you be able to compare.

[Carl-NC]

Do you know which pads on the board are for TX and which are for RX? If so, then you also need to know which is TX+, TX-, RX+, and RX-. If you don't know this it's usually pretty easy to figure out by tracing out a few components.

Next, as Skippy said, figure out which wires are TX & RX by measuring resistance. Then, again, you need to figure out which are + and -. That may not be so easy and it may require trial&error connecting to the board.

[surfdetector]

Hello, I picked up a detectorpro headhunter pro underwater model detector that someone botched a coil change on and burnt 2 pads and pulled the traces. I have the board repaired but not sure about the wiring. It uses 4 wires 2 white and two blue. It had 2 coils with it. The 12 inch NEL and the 8 inch it is a 2.4 Khz machine. I believe the person removed the 12 inch and was attempting to install the 8 inch. I am planning on putting the 12 inch back on. The board is labeled 1, 2, 3, 4 but none of the wires are labeled in any way. I believe 1 is a blue 2 white 3 blue and 4 white. At least that is how the person had attempted to solder it when they had tried to put the 8 inch on.

this is a guess on my part that

1 is RX A
2 is RX B
3 is TX A
4 is TX B

Like an Excalibur, but that is a guess and I am still looking at 4 unmarked wires other than 2 being blue and 2 being white. I don't want to get it wrong a couple times and then botch my repair up in the process. This is probably not that hard to figure out so thank you for humoring me.

It would be great to see a couple of high resolution pictures of the board. That might be helpful.
Cheers