Ah, I just saw your other posts with your mods so far, cool!
So for the most part, the older style extruder pcb is already well plotted out by a blogger going under the name "SteelCity" , and you can see the schematic he made here: https://steelcityelectronics.com/da-vin … ruder-pcb/
Here's a pinout I've made of the older style motherboard's "Fan" connector the extruder pcb connects to, for reference:
(I've quickly added a header for these images to make it clearer which board they belong to.)
The text in gray lists the peripherals and the pin number of the microcontroller for firmware changes etc; albeit there's some components in-between the IC pins and the connector obviously (resistors etc).
And for the 1.0A boards:
Yeah, the only real difference is the extra fan pin that was added.
It's for the unpopulated "fan b" port on the extruder PCB.
Looks like they were probably going to add in a layer cooling fan of sorts, but for whatever reason decided not to in the end. Oh well.
To help you match the pins to the new extruder, here's a quick copy paste of the pinout text applied directly to a picture of the 1.0A extruder PCB:
All you need to do is remove the pin and wire of "Fan B" from the replacement wiring connector on one end.
On the other end you'll need a 6 pin JST-PH connector housing. If you have one, you can rearrange the pins:
If you look closely at the wiring connectors you'll see tiny little plastic tabs you can slide a tweezer under -> gently lift up -> and pull out the pin/wire. (Don't do they too many times as they'll get weaker and eventually fail.)
Then you can insert the pin/wire into another slot.
Or just any way to connect the wiring to the board I guess.
Side note:
I'd really recommend getting a JST-PH assortment pack such as this: https://smile.amazon.com/Pieces-JST-PHR … YP4T9?th=1
and a crimping tool such as: https://smile.amazon.com/IWISS-IWS-3220 … B078WPT5M1
Especially if you're going to work with the board often, or even other electronics to be honest.
JST-PH connectors are literally almost everywhere.
Hope this helps!