Missing Or Inappropriate Termination - EKE-Electronics CVB1621A Technical Manual

Troubleshooting
The following figure shows a waveform that indicates an entirely missing signal.
Figure 4.8: Missing signal
If the other half of the differential signal is missing, the cause can be a short circuit in
the bus, or a broken conductor in the bus cables, or faulty termination. Locate the short
circuit or broken conductor and solve the problem.
If the entire signal is missing, the cause can be a short circuit in the bus or in bus
connectors. Locate the short circuit and solve the problem.
One possible cause for a low signal level can be bus overload. The bus is designed for
connecting CAN Bus devices, not any other kinds of devices. If inappropriate devices
are connected to the bus, it becomes overloaded and cannot function.
To find out whether the problem is caused by bus overload, check all connections to
make sure that there are no inappropriate devices connected to the CAN Bus. If you
find any inappropriate devices, disconnect them.

4.5.7 Missing or inappropriate termination

A transmission error can be caused by missing or incorrect termination in one end of
the bus.
The following pictures present waveforms indicating missing, defective or inappropriate
termination. If your transmission error results from any of the above, you can measure
the terminator with a multimeter. Remove and replace any defective component.
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