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Appendix J
Inspections
Carry out regular inspections to ensure the Ethernet Unit is functioning perfectly.
Items
Most of the parts that make up an Ethernet Unit are semiconductor components. None of the parts in the Unit will
wear out after a specific lifetime, but some parts may deteriorate due to extreme operating condition. Therefore, it
is important to inspect the Unit regularly.
Inspection Interval
Normally inspect once or twice per year. Choose the inspection period according to the severity of the operating
conditions. New installation should be inspected more frequently until they are judged to be stable.
Inspection Items
Correct any of the items in the table below not conforming to the specified standard.
Item Details Standard
Environment Temperature around Unit 0 to 55°C
Humidity around Unit 10% to 90% (with no condensation)
Accumulated dust No accumulated dust
Mounting Ethernet Unit firmly attached No looseness
Transceiver cable connector fully pushed in No looseness
Condition of transceiver cable No visible abnormality
Tools Required for Inspection
The following tools are needed to inspect the Ethernet Unit:
Standard Tools
• Flat-blade and Phillips screwdrivers
• Tester or digital voltmeter
• Industrial alcohol and a clean cloth
Tools Required Under Special Circumstances
• Synchroscope
• Pen oscilloscope
• Thermometer and hygrometer
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