Common Problems And Their Solutions; Troubleshooting - Raymarine DSM250 Owner's Handbook Manual

Chapter 7: Maintenance and Problem Solving

Common Problems and Their Solutions

Table 7-2: Common Sounder Problems
Problem
Display does not function
Display "freezes"
Sounder does not display
fish
Sounder does not see
bottom or fish
Sonar display is unreli-
able at high boat speeds
Sounder displays a lot of
background noise
Sounder speed or log
readings are wrong
Sounder temperature
readings are wrong
Correction
1. Make sure that the power supply cable is sound
and that all connections are tight and free from
corrosion.
2. Check the system fuse.
1. Check the scroll speed is not set to zero.
2. Check the transducer cable for damage.
If damaged, the cable and transducer must be
replaced as a unit.
1. Fish arches are not displayed if the boat is stopped -
fish appear on the display as straight line.
2. Ensure the transducer is within 10 ° of vertical.
3. Check that the gain is not set too low.
1. If you have a transom-mount transducer, check
that the transducer hasn't kicked-up on hitting an
object.
2. Check that the gain is not set too low.
3. Check that the transducer is within 10° of vertical.
4. Check that the transducer face is not covered or
fouled. If necessary clean the transducer.
5. Check the voltage from the power source; if this is
too low it can affect the transmitting power of the
sounder.
1. Turbulence around the transducer may be confus-
ing the unit.
1. Check that the gain is not set too high.
2. Check that the transducer is mounted correctly and
is clean.
1. Check that the transducer paddle wheel is clean.
2. If necessary add a speed offset.
3. If receiving SeaTalk speed, unplug the SeaTalk con-
nector.
1. If necessary, adjust the TEMP CALIBRATE parame-
ter.
2. If receiving SeaTalk temperature, unplug the
SeaTalk connector.
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