No Bottom Reading on the Display
If there is no bottom reading visible on the display, there are a number of possible
causes for this condition, including:
• if the loss of bottom information occurs only at high boat speeds, then a
transducer adjustment may be needed (refer to the Transducer Installation
section);
• check the transducer cable connection on the back of the HDR 650 and
make sure that the cable to the transducer has not been cut or pinched, as
even a small abrasion in the cable can affect performance significantly.
Correct any known problems, including adjusting the transducer, or actually
replacing the transducer cable if necessary.
No Continuous Depth Display in Very Shallow Water
Losing continuous depth when the boat is in very shallow water is normal,
because the automatic range control cannot lock onto the bottom in depths of
one foot or less.
Screen Fades, Images are not Sharp
If the screen begins to fade, and images are not as sharp as normal, check the
input voltage. The HDR 650 will not operate on input voltages below 10 VDC.
Bottom Reading Disappears During a Hard Turn
Losing the bottom reading temporarily when the boat is executing a hard turn is
normal, as the transducer emerges from the water during such a turn; this
condition should correct itself once the turn is completed.
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Troubleshooting
