Problem Solving; Common Problems And Their Solutions - Raymarine DSM25 Owner's Handbook Manual

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5.3 Problem Solving

All Raymarine products are, prior to packing and shipping, subjected to
comprehensive test and quality assurance programs. However, if this unit should
develop a fault, please refer to the following table to identify the most likely cause
and the corrective action required to restore normal operation.
If you still have a problem after referring to the table below, contact your local
dealer, national distributor or Raymarine Technical Services Department for
further advice. Always quote the product serial numbers. The serial number is
printed on the back of the unit.

Common Problems and Their Solutions

Problem
Display "freezes"
Fishfinder does not dis-
play fish
Fishfinder does not see
bottom or fish
Fishfinder displays a lot of
background noise
Fishfinder speed or log
readings are wrong
Fishfinder temperature
readings are wrong
Sonar display is unreli-
able at high boat speeds
Correction
1. Check that the scroll speed is not set to zero or PAUSE.
2. Check the transducer cable for damage. If damaged, the
cable and transducer must be replaced as a unit.
1. Fish are not displayed if the boat is stopped -
targets 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. Check that the GAIN is not set too low.
2. Check that the transducer is within 10° of vertical.
3. Check that the transducer face is not covered or fouled.
If necessary, clean the transducer.
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, adjust the SPEED CALIBRATE parameter.
1. If necessary, adjust the TEMP CALIBRATE parameter.
1. Turbulence around the transducer may be confusing the
unit.
DSM25 Owner's Handbook