3/29/2024 0 Comments Icom 756 pro ii cable![]() ![]() Really had me scratching my head.I pulled the rig apart 4 times while testing voltages and ruling out problems, bit by bit. I verified the rig address (50H), and everything was OK. Once I got the CI-V port transmitting data (nice TTL level data seen on a scope), I tried every possible combination of baud rate setting on the USB port, the rig, and the software.but nothing worked. I tested all of the smd resistors in the circuit and found them to all be OK. Super nice guy, really knows these rigs, I'd recommend him for service if you need to send your rig somewhere for repairs. He was a tremendous source of help, and sent me a couple of pics of the main poard with the parts I was looking for, circled for my ease of location. All of the pdf's I found online are far too blurry to see the part. My problem was, I couldn't physically find them on the main unit board. I found them on the schematic and ordered those in. This is a buffer circuit on the CI-V port input on the rig, prior to the processor. I've read where folks have found the problem to be the transistor pair q801 & q802. My Icom 756 (not pro model) lost it's CI-V port from energy induced into the CI-V cable during a near lightning strike. ![]() I made these repairs in September of 2013, but a post this morning from another ham with the same problem prompted me to dig up the info and post to hopefully help others with the same problem. ![]()
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