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Trying to make the OPC-1211 firmware upgrade cable

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Flameout00

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I have been trying, unsuccessfully, to find the pinout information for of the Icom OPC-1211 cable, which is needed to update the firmware of the FR3000/FR4000 repeater. One end is USB and the other is JST ZH 1.5mm 6 pin that plugs into J12 on the logic board. (I do have the EX-2717 firmware software)

I have the service manual, but J12 isn't even shown on the schematics! I can search things like J8, J10, J11, etc and the search function of the pdf file goes right to the proper spot on the schematic. Nothing for J12, which seems weird. I am by no means an electronics wizard, so I'm sure I'm missing something. I tried attaching the Service Manual PDF, but it's 8mb, so too large for here. I did attach a photo of J12 on the logic board though. I'm assuming only 4 of the 6 pins are used, since the USB is only 4 wire??
(This is the service manual for the FR4000 repeater - https://www.lyonscomputer.com.au/Ra...4000-UHF/docs/ICOM-FR-4000-Service-Manual.pdf )
 

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Flameout00

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I was looking at at my current Icom OPC-i592 FTDI USB programming cable, and it only has two wires going to the RJ-45 mic plug. A white wire to pin 2 and black wire to pin 7.
Pin 2 of the IC-FR4000 is I/O Port for PC Programming and Pin 7 is Speaker Ground and as far as I can tell, that J12 on the Logic Board shows Pin 1 as a Ground, pin 2, 3, 5 and 6 all show a positive voltage of just under 5 volts and I have no idea what Pin 4 would be. Could that possibly be the pin that would be used to program the firmware?
 
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