Furuno ETR-30N - Manual (Page 33)

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2.4 Erasing Transducer Setting
When changing transducer(s), erase previous transducer setting(s) as shown below and
then enter new transducer settings as in paragraph 2.2. (The set cannot transmit unless
transducer settings are entered.)
To erase transducer settings, do the following:
1. Turn on the power while pressing and holding down switch S1 (TDCLR) on the CPU
board.
2. Release S1 when the TX/STBY LED flashes slowly.
S1
02P6307 CPU
Board
TX/STBY
LED lamp
ETR-30N, cover removed