SMC Networks HPAV-ETH Manual page 8

Only a qualified technician should service this product. Opening or removing
covers may result in exposure to dangerous voltage points or other risks.
Unplug the powerline adapter from the power outlet and refer the product to
qualified service personnel for the following conditions:
When the interconnect cords are damaged or frayed.
If liquid has been spilled into the product.
If the product has been exposed to rain or water.
If the product does not operate normally when the operating instructions are
followed.
If the product shows a distinct change in performance.
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