Troubleshooting; Common Problems And Their Solutions - Raymarine DSM400 Installation Manual

3.4 Troubleshooting

All Raymarine products are, prior to packing and shipping,
subject to comprehensive test and quality assurance programs.
However, if the unit develops a fault please refer to the following

Common problems and their solutions

Problem
Display freezes
Sounder does not display fish
Sounder does not see bottom or fish
Sounder displays a lot of background noise
Sounder temperature readings are wrong
Sonar display is unreliable at high boat speeds
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1. Check that 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 has stopped - fish will appear on the display as a straight line.
2. Ensure the transducer is within 10 degrees of vertical.
3. Check that the gain is not set too low.
1. Check that the gain is not set too low.
2. Ensure the transducer is within 10 degrees of vertical.
3. Check that the transducer face is not covered or fouled - If necessary clean the transducer.
4. Check the voltage from the power source. If it is too low it can affect the transmitting power of the
sounder.
1. Check that the gain is not set too high.
2. Check that the transducer is mounted correctly and is clean.
If necessary, adjust the TEMP CALIBRATE parameter.
Turbulence around the transducer may be confusing the unit. Check the transducer location.
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table to identify the most likely cause and the corrective action
required to restore normal operation.
If there is still a problem after referring to the table, contact your
local Raymarine dealer, national service agent or Raymarine
Technical Services for further advice. Always quote the product
serial number which can be found on the back of the unit.
Solution
Raymarine DSM400 Digital Sounder Module