Japan Radio Co. JLN-740A, Инструкция по эксплуатации

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In case water or a metal object gets inside the equipment, turn off the power
and the breaker immediately, unplug the power supply cable from an electric
outlet, and contact the store, nearest JRC agent, JRC marine service
department, sales department, regional office, branch or sales office.
Keeping the equipment in operation under such condition may cause a fire,
an electric shock or a malfunction.
Always turn off the power and breaker before inserting/removing this
equipment or the connector of the connection cable with the external
equipment.
Failure to comply may result in fire or an equipment fault.
Do not touch the power supply cable or circuit cable during severe thunder.
Failure to comply may result in an electric shock.
When the power cable is damaged (exposed cable conductor, broken cable,
or torn capsule), request replacement to the store, nearest JRC agent, JRC
marine service department, sales department, regional office, branch or
sales office.
Using the cable as it is may result in fire or an electric shock.
Do not apply strong shock to the power supply cable or the LAN cable by
striking it or hammering it.
Otherwise, an open circuit failure may result.
Make sure using the specified fuses.
Otherwise, fire or an equipment fault may occur.
Before exchanging fuses of this equipment, the equipment must be switch off
and the AC/DC input must be cut off
When installing the cable that comes with the transducer mounting, make
sure that the cable is not tightly bent, or twisted, and that no pressure is
applied to the cable.
Otherwise, the cable may crack or the inside of the covering may be
damaged, causing a fire or an electric shock.
Do not perform installation or maintenance to the transducer mounting on the
water.
Otherwise, water may get into the transducer mounting.