-14-
11, Remove the batteries from the fish finder to prevent
battery leakage and corrosion.
12, As the depth range is from 0.6m-30.4m, the fish finder
would not work properly if the water is too deep or shallow.
Note: Changes maybe made to the information in this
operation guide without obligation to notify any person of
such revisions or changes.
13,The too much weed in the water may cause the incorrect
reflect.
6,Make sure the transducer was dipped into the water
before operating.
9, Never use a blunt to strike the sonar sensor as this may
cause damage to the sensitive internal electronics.
10, Never use the same two FD39 in the same area as this
may cause the product can not work properly due to the
ultrasonic and radio frequency interference.
7,Make sure all plugs was connected tightly before using.
8,Continuous backlight operation significantly decreases
battery life.
4. So if the fish finder can fid and display the ultrasonic
reflection based pointed results on the LCD display of
fishfinder then it is targeted results.
5. but of course, if it can not detect out any fish under
water, but if there are fishes under water, then it is not
qualified unit.
