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Inspect your ATC board for LED lights that are illuminated. If you have no lights at all, move to the step.
If you have lights on your board but still no communication, ensure all wires are properly seated and secured in the terminals on the ATC board itself and try and reseat the connector
Check for 68 Vdc across wires 204 and 205 at the ATC control board.
If you do not have +68 Vdc across wires 204 and 205, move to the DC bus board in the electrical cabinet and check the F8 fuse for continuity. If you do not have continuity, replace the fuse.
Note: This value should be close to zero and absolutely no more than 5 ohms.
If you have +68 Vdc but no lights on your ATC board, please contact Tormach Tech Support.