Humminbird LCR 3004, Operation Manual

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Step 2:
Still moving at a slow speed, begin going toward deeper water. You will see that the LCR
will display changes as small as 3 inches on the 0-15 foot scale. Continue to move into deeper
water until the bottom return goes off the display. The LCR will automatically change to the next
deeper depth scale (indicated at bottom of the display). See Figure 15 for a display of a typical
range change from 0-30 foot scale to 0-60 foot scale, You will notice that now the bottom is about
half way up to the screen.
Step 3:
Press the depth set button once to change to the next lowest scale. If the bottom is
deeper than this scale, the computer will automatically change back to the proper scale. By
pressing the depth set button three or four times you will see that the depth scale will change
down to the 0 to 15 foot scale and then to the 0 to 120 foot scale.
Step 4:
Press the Auto Sensitivity On/Off button to change to the manual mode. Notice that the
word AUTO in the upper right hand corner of the display has gone off. Also, the area below the
bottom is no longer blacked out. You can now change the sensitivity setting by pressing the
in or decrease - buttons. Notice that the digital bottom reading goes off in the manual
mode. Note: In the manual mode the depth scales will not automatically change. The automatic
depth change works only in the automatic mode.
Push the Auto On/Off button to go back to the automatic mode.
Step 5:
Press the alarm on/off button to turn on the bottom alarm. Next press the range down (s)
button until the alarm setting is lower than the bottom reading. A continuous alarm will be heard
indicating that the bottom depth is equal to or less than the alarm setting. Press the alarm on/off
button to turn the alarm off.
Step 6:
Press the Fish Alarm on/off button. Notice the letter "F" in the upper left of the screen
indicating the Fish Alarm is on. Now if an object is detected between the surface and the bottom,
a short alarm sound will be heard. By pressing the Fish Alarm on/off button again the Fish Alarm
is turned off. The letter "F" will move left off the screen as the display moves left.
Step 7:
Steps 1 through 6 have verified that your LCR is working properly. You are now ready to
increase boat speed to test the transducer installation. As you increase boat speed the LCR
should give a continuous bottom return. With a proper transducer installation your LCR will
perform well at speeds over 75 mph.
TROUBLE SHOOTING: If at high speeds the bottom return is not continuous or there are
gaps in the bottom, then the transducer installation or location is such that air is going under the
transducer face. Remember that a transducer cannot work properly through air or through air
bubbles in the water. Refer back to the transducer mounting procedure for adjustments or for
other mounting options.
TROUBLE SHOOTING: If when making a hard turn, the bottom reading is lost, it is the
result of the tranducer coming out of the water during the turn.