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This document describes how to investigate the cable and belonging connector(s) are broken/defect.

Sometimes, we can get unstable connection to a sensor. This will be seen as gaps in echograms in inspector and grafana.

This is because the communication between CPU and sensor is unstable. This must be one of the following reasons:
1) Bad inner cabinet (and/or CPU)
2) Bad cable (between CPU and sensor)
3) Sensor

Step 1: Eliminating CPU

Almost for all cases, we only have bad connection with only one of the two sensors.


For example:
Lets say that the communication is bad with the top sensor.

  • Top sensor is now connected in Port A

  • Bottom sensor is connected to port B.

By switching the top- and bottom sensor (now top sensor is in Port B, and bottom sensor is in Port A), we will get two scenarios:

  1. The top sensor starts working

    1. We know that the sensor and cable is good → The error must come from the inner cabinet towards port A

  2. The top sensor still doesnt work, but bottom sensor works

    1. We know that the inner cabinet is good

    2. We know the issue must be in 2) or 3) - Bad cable/connector or the top sensor itself


Step 2: Decide if the root cause is cable or sensor

We now need to figure out if the communication error is caused by

  • Cable OR

  • Top sensor

Inspecting Connectors

Our Binder-connector consist of three parts:

  1. Contacts – The part with conductive components (The part that is at the very end of the connector)

  2. Housing – The outer shell that holds the components together. (The middle piece of the connector)

  3. Strain Relief – A section that prevents stress on the wires. (The inner piece that is closest to the cable)

These parts must always be assembled so that they do not rotate relative to each other without significant force.

  1. If there is rotation:

    • Inspect both the inside and outside of the connector to see if there is humidity/water or corrosion

    • Assemble the connector so it becomes firm

  2. If firmly mounted and no rotation or looseness:

    • Inspect the outside of the connector for corrotion or any other visible damage

After making sure that the connector is firmly attached with no visible damaga or looseness, connect it back to the inner cabinets Port. Inspect the LED activity

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