Network Board Blocks Card Reader Communications to FEC - Some failure modes may prevent the card reader (if connected) to communicate with the FEC. If this is the case, the NWB itself may or may not be able to communicate with the FEC.
To eliminate the possibility of a bad reader, it is helpful to temporarily eliminate the NWB from the circuit. Unplug the harness from the NWB to the card reader, and also unplug the harness from the NWB to the FEC. Next, connect the harness which is used to connect a card reader directly to the FEC.
NOTE: This harness is not included in machines containing a NWB, the individual performing the service to the machine will have to have this harness.
Once the card reader is linked directly to the FEC, wait 15 seconds, and insert any card into the reader. The FEC display should change to reflect the card insertion. If the FEC does not indicate that a card was inserted, the NWB may not be the problem. In this case, see the section on Card Readers.
If the card reader does communicate the card insertion to the FEC, remove the temporary harness and put the original harnesses back in place, so that the NWB is once again in the circuit.
Next, swap the harness from the NWB to the card reader with a known good harness. If the reader is now able to communicate a card insertion, the harness is at fault, and must be changed. If not, put the original harness back, and continue.
Check that there is 5 VDC across pins 1 & 2 of H1 on the NWB. If this voltage is not there, communication between the FEC and the card reader or NWB will not occur.
If there is 5VDC across pins 1 & 2 of H1 and the card reader cannot communicate with the FEC, swap the harness between the FEC and NWB with an known good harness. If this fixes the problem, the harness is at fault.
If the harness is not at fault, the NWB should be swapped with a known good board. If this fixes the problem, the NWB needs to be replaced. If after changing out the NWB and the harness with known- good samples the card reader cannot communicate with the FEC, the FEC must be at fault.
Troubleshooting
Network Board to PC
Communication Problems
Communication between the NWB and the PC may be interrupted via several cases:
•NWB not operating correctly (not executing program)
•NWB cannot communicate with FEC (NWB cannot get its correct node number)
•Problems on network external to the NWB under test
-Wires flipped at one or more points on the Network
-Short on the Network
-Noise on the Network (another node jabbering, reflections, etc.)
NWB Not Operating Correctly - If the NWB is not executing the code in the processor correctly, there is no way it can communicate with the FEC. Use the network board operating LED test and the network board communicating LED test to verify operation.
NWB Cannot Get Node Number From PC - If this is the case, the PC should be able to communicate with the NWB by attempting to communicate with node
250.Note that since 250 is the default node in the NWB, if it cannot retrieve another node number from the FEC, it will default to 250. When running this test, remember that there may be other nodes on the network, due to other failures, that may result in more than one node 250 on the network. If this is the case, the PC may not be able to get through to any node numbered 250. Because of this, it is desirable, if possible, to perform this test on a
If the PC can communicate with the NWB as node 250, then either the FEC has node number 250 programmed into it (test via the Microwand), or the NWB is not communicating with the FEC. Use the network board communicating LED test to verify operation.
Problems Related to Network - If possible, it may be beneficial to isolate the NWB in question from the rest of the network, creating a
With the NWB alone connected to the PC, attempt to communicate with the board. If no communication occurs at any node number, the NWB or the harness from the NWB to the connector at the rear of the machine is bad. Try swapping the NW cable from the rear connector to the NWB and test again. If communication is successful, the harness needs to be replaced.
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