Raymarine REALVISION 3D RV-3 Series Installation Instructions Manual page 44

No depth reading / lost bottom lock
Possible causes
Transducer location
Transducer angle
Transducer kicked-up
Power source insufficient
Damaged or fouled
transducer
Damaged cables
Vessel speed too high
Bottom too shallow or too
deep
Poor / problematic image
Possible causes
Targets will appear differently
if your vessel is stationary (e.g.:
fish will appear on the display as
straight lines).
Scrolling paused or speed set too
low
Sensitivity settings may be
inappropriate for present
conditions.
44
Possible solutions
Check that the transducer has been installed in accordance with
the instructions provided with the transducer.
If the transducer angle is too great the beam can miss the bottom,
adjust transducer angle and recheck.
If the transducer has a kick-up mechanism, check that it has not
kicked up due to hitting an object.
With the product under load, using a multi-meter, check the
power supply voltage as close to the unit as possible to establish
actual voltage when the current is flowing. (Check your product's
Technical specification for power supply requirements.)
Check transducer condition, ensuring it is not damaged and is free
from debris/fouling. If necessary, clean or replace your transducer.
After cleaning or replacement coat the transducer using a
water-based anti-fouling paint.
1. Check the unit's connector for broken or bent pins.
2. Check that the cable connector is fully inserted into the unit
and that the locking collar is in the locked position.
3. Check the cable and connectors for signs of damage or
corrosion, replace if necessary.
4. With the unit turned on, try flexing the power cable near to the
display connector to see if this causes the unit to re-boot/loose
power, replace if necessary.
5. Check the vessel's battery voltage, the condition of the battery
terminals and power supply cables, ensuring connections are
secure, clean and free from corrosion, replace if necessary.
6. With the product under load, using a multi-meter, check for high
voltage drop across all connectors/fuses etc (this can cause the
Fishfinder applications to stop scrolling or the unit to reset/turn
off), replace if necessary.
Slow vessel speed and recheck.
The bottom depth may be outside of the transducers depth range,
move vessel to shallower or deeper waters as relevant and recheck.
Possible solutions
Increase vessel speed.
Unpause or increase sonar scrolling speed.
Check and adjust sensitivity settings or perform a Sonar reset.