Furuno ETR-30N - Manual (Page 37)

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3.4 All Clear
When the sounder picture appears to be abnormal, execute the “all clear” function from the
ETR-30N to try to restore normal operation. All clear erases all transducer settings, so
reenter them referring to paragraph 2.2.
1. Turn off the ETR-30N.
2. Remove the cover.
3. Short between #5 and #6 of J9 on the CPU Board and then turn on the power.
02P6307
CPU Board
1 3 5
2 4 6
J9
ETR-30N, cover removed
4. After the TX/STBY LED flashes, turn off the power.