Humminbird LCR 40-ID, Operation Manual

USING THE LCR

LEARNING TO USE YOUR LCR 

LEARNING TO USE YOUR LCR

 
After installing the unit, transducer, and power cable as instructed, the LCR is ready for 
use. By following the steps below you will be able to quickly learn how to use the LCR. 
Also, trouble shooting suggestions are listed in these steps. Note: Perform steps 1 
through 7 at idle or slow speed. These steps will insure that your LCR is working 
properly. 
 

Step 1 

 
Turn your LCR on by pushing the “On” button. The LCR'S computer will automatically 
adjust the sensitivity and depth scale so that in about one second you will see images 
appear on the right side of the display and moving to the left. The small gap in the zero 
line allows you to see movement on the display even when the bottom is not changing. 
 

TROUBLE SHOOTING:

 If nothing happens when the “On” button is pushed, check your 

electrical connections and fuse. Also check that the red wire on the power cable is 
connected to the positive battery terminal and that the black wire is connected to the 
negative battery terminal. If these wires are reversed it will not damage the LCR. 
 
It is normal if when reversing the boat, the bottom return is lost, since air from the prop 
is being forced under the transducer- remember the transducer cannot transmit through 
air. 
 

TROUBLE SHOOTING:

 If the display comes on when the "On" button is pushed but no 

bottom information is seen, check that the transducer connector is securely locked to 
the rear of the LCR. Also insure that the transducer is completely submerged. A 
transducer cannot work properly in air or through air bubbles in the water. 
 

TROUBLE SHOOTING:

 In very shallow water, the bottom reading might have gaps or 

the scale might change to a deeper scale This is normal in one or two feet of water. The 
automatic mode cannot “lock” onto the bottom in very shallow water. 

 
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. Continue to move into deeper water until 
the bottom return moves off the display. The LCR will automatically change to the next 
deeper depth scale (indicated at bottom of the display). Notice that the entire screen is 
changed to the new depth scale. This is the Total Screen Update feature.