Diagnostics
3. Turn the system on and allow it to boot completely.
4. Connect channel 1 of a digital oscilloscope to ARCNET_HI, which is TP6 on the extender PCB.
5. Connect channel 2 of a digital oscilloscope to ARCNET_LO, which is TP7 on the extender PCB.
6. Configure the oscilloscope to sum the two components of the differential signal. This allows you to clearly observe the ones
and zeroes.
7. Verify that all four nodes are present on the displayed ARCNet signal, and that these nodes are in proper sequence. You can
identify them as follows:
Node 1: Fluoro Functions PCB, hex code 40
Node 2: X-Ray Controller PCB, hex code 20
Node 3: Service node, hex code 50
Node 4: Workstation mode, hex code F0
The following illustration shows all four ARCNet nodes active. Investigate all inactive nodes.
Subsequent illustrations show individual node details. Note that the scope sweeps right to left, displaying the most significant bit
in the binary node identifier first. Printed node identification data was added, and was not generated by the oscilloscope.
23
Service
Periodic Maintenance
Contents
Schematics
Illustrated Parts
Installation
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