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FREQ. ADJ
Adjusts transmitting frequency to suppress interference when it cannot be suppressed with
the interference rejector alone.
TARGET ECHO
Sets fishing objective. Choose NORMAL for general fishing; SURFACE for detecting
surface fish. Pulse repetition rate for “SURFACE” is higher than “NORMAL.”
Transducer frequency
The ETR-30N offers various transducer frequencies. Therefore, the descriptions “50 kHz”
and “200 kHz” should read as “LF (Low Frequency)” and “HF (High Frequency),”
respectively.
3.3 Replacing Fuses
The ETR-30N has two fuses to protect against overcurrent: a 5A fuse in the snap-in fuse
holder in the power cable and a 7A fuse inside the network sounder. If a fuse blows, find the
cause before replacing it. If it blows again after replacement, contact a FURUNO agent or
dealer for advice. If the LED lamp is off and the fuse in the power cable is normal, the fuse
inside the network sounder may have blown. If this occurs, contact a FURUNO agent or
dealer.
NOTICE
Use the correct fuse.
Use of a wrong fuse can cause serious
damage to the equipment.