Program transmition error TDK Radial machine VC-7C

We have a TDK radial machine VC-7C, The "DNC CUT" button doesn't change state, the machine shows alarm "904 ALM CRD RX RECEIVE 800", We already check button and relay and working OK, Also check the cables and also OK. We have no idea where else to look at, We cant transmit programs from computer to machine. If someone can share electric diagram and manual will be very helpful. Does anyone have an idea where can I get support for this machine? We are in the north east side of Mexico right at the border with US, If someone have a contact for support or service for this machine will be great.

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