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Any opinions on the Aixun T420D?

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Tor Björn:

--- Quote from: Astray on April 27, 2024, 04:02:53 pm ---Do you have a photo or diagram of how the wire to the tall stand is connected to the main station?

--- End quote ---
Yes, you can see additionally installed pin #4 in plug of T115A handle on my photos in post #115. One end of extra wire is soldered to this pin, other end - connected to the "tall stand" (pre-disabled from "stanby" yellow pair internally in holder).

--- Quote from: Astray on April 27, 2024, 04:02:53 pm ---Is that standby pin just a ground pin or something different?
--- End quote ---
"Stanby" pin #4 and "extractor" pin #3 are internally pulled up (to 3.3V) different pins of microcontroller. When you insert a handle to cradle (connected to pin #4) or tip of cartridge to extractor (connected to pin #3) you push these pins to gnd, and can see a state "stanby" or "extract" on station's display. T245 handle have a gnd on metal ring, T115A have a gnd both on metal tip and on metal shank near rubber cable gland.

--- Quote from: Astray on April 27, 2024, 04:02:53 pm ---Wondering if might not be possible to internally connect the standby pins of both channels inside the main station so there's no need to run an extra wire.
--- End quote ---
No. "Stanby" pin #4, "extractor" pin #3 of channel #1, and "Stanby" pin #4 and "extractor" pin #3 of channel #2 are FOUR different pins of MC.


--- Quote from: Astray on April 27, 2024, 04:02:53 pm ---In hindsight, the cheapest maneuver was probably buying a T405 unit and hoping to get sent one with T420D firmware...
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All sellers warned me that T405 only works with T115 handle and T410 only works with T210 handle:

Maybe this words are "chinese half-truth" and these kits  have the same hosts with same transfos (less powerful than T420/420d) that can work with both T115 and T210 handles but not at same time.

Astray:

--- Quote from: Tor Björn on April 27, 2024, 06:58:11 pm ---Yes, you can see additionally installed pin #4 in plug of T115A handle on my photos in post #115. One end of extra wire is soldered to this pin, other end - connected to the "tall stand" (pre-disabled from "stanby" yellow pair internally in holder).

--- End quote ---
Okay, so I think a finally understand. You have 2 wires coming out of the socket that connects to one of the ports of the back and one of those wires is going to the tall stand with arm for the T115 handle. I think a photo of the back of your main unit with all the wires would be very helpful to others in the future if they want to do the same mod. I will be doing it myself once I get the T115 handle in the mail.


--- Quote from: Tor Björn on April 27, 2024, 06:58:11 pm ---"Stanby" pin #4 and "extractor" pin #3 are internally pulled up (to 3.3V) different pins of microcontroller. When you insert a handle to cradle (connected to pin #4) or tip of cartridge to extractor (connected to pin #3) you push these pins to gnd, and can see a state "stanby" or "extract" on station's display. T245 handle have a gnd on metal ring, T115A have a gnd both on metal tip and on metal shank near rubber cable gland.

No. "Stanby" pin #4, "extractor" pin #3 of channel #1, and "Stanby" pin #4 and "extractor" pin #3 of channel #2 are FOUR different pins of MC.

--- End quote ---
Oh, so if either the tip or the metal rings on the handle touch the stand then those pins will be grounded and tell the microcontroller to put the handles in sleep mode! This is very helpful.

Even if you connect those pins together with a resistor in the inside the unit it would cause both handles to be in sleep mode if either one of them was grounded so that would defeat the purpose.


--- Quote from: Tor Björn on April 27, 2024, 06:58:11 pm ---Maybe this words are "chinese half-truth" and these kits  have the same hosts with same transfos (less powerful than T420/420d) that can work with both T115 and T210 handles but not at same time.

--- End quote ---
I'm a bit doubtful they are different hardware, but very possibly have different firmware/software that would prevent using a dual station. It's already too late anyways, I have my unit even though I select the wrong handle and now have a T210 handle and 3 tips that I did not need or want haha. The seller is sending me the correct T245 handle but not the tips because I made a mistake while ordering. This mistake ended up costing me $30 extra unfortunately :'(

Tor Björn:

--- Quote from: Astray on April 27, 2024, 07:32:54 pm ---I think a photo of the back of your main unit with all the wires would be very helpful to others in the future if they want to do the same mod.

--- End quote ---
I agree with you, Astray. I specifically re-disassembled the holder and captured the necessary changes ;)









Astray:
Anyone embarking on the modification that Tor Björn did, the solder iron stand base has screws under the two front feet so you can get access to the grounding wire you need to disconnect.

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