Got a 6-stop TAC50-04 throwing a 1084 Fault SPI Loop Error. Have verified all SPI loop cables, Jumpers, voltages and swapped the CN board. Have also done TECC. S24-1 boards are powered on and CN board LED is blinking rapidly, indicating SPI Loop Error.
What all is in the loop? If it’s all S24-1 boards, get one and replace each, one at a time. Also, how did you verify the cables are good? Most plug in testers will only catch a bad cable that’s actually open. Replacing them is the best way to be sure. I made a little tester with 2 breakout boards that jumps the pairs together on one end so you can check resistance of each loop from the other. Those kind of bad cables usually show up as one loop measures 1 or 2 tenths of an ohm more than the other 3. And you did the TECC after replacing the CN right? It doesn’t know how many ports to look for until you do.