Furuno FR-1710 - Manual (Page 59)

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3.6 Advanced-level Troubleshooting
This paragraph describes how to cure hardware and software troubles which should be car-
ried out by qualified service personnel.
Note: This radar equipment contains complex modules in which fault diagnosis and repair
down to component level are not practicable by users.
Serviceman qualification
All adjustments of radio transmitter during or coinciding with the installation, servicing, or
maintenance which may affect the proper operation must be performed by or under the imme-
diate supervision and responsibility of a person holding an operator certificate containing a
ship radar endorsement.
This is what the U.S. Codes of Federal Regulations part 80.169 implies (not exact extract).
As such, every administration sets forth its own rule; service personnel must be aware of this
kind of competency requirements.
Service call
When making a service call to your service agent, check S/N and symptom beforehand.