Furuno CH-37 - Manual (Page 84)

7-10
Check Symptom
Color partially irregular Magnet is near the screen.
This symptom occurs if equipment
which contains a magnet (loudes-
peaker, etc.) is placed near the
screen. Check to see if the degaus-
sing circuit is turned off on the SYS-
TEM SETTING menu. See page 6-
2.
Note: If not cleared, consult with
electronics technician.
Picture distorted Equipment generating strong mag-
netic field is near display unit.
Locate magnetic field generating
equipment (rectifier, etc.) well away
from the display unit.
Picture contains noise Equipment not grounded properly.
Carefully check the ground.
Power cable is run alongside the
signal cable.
Signal cable may pick up noise emit-
ted from power cable of other equip-
ment; therefore, separate them from
each other.
Debris may be on sea surface.
Reject unwanted echoes with the
interference rejector on the SONAR
menu, TVG control or NL control.
Display Unit Transceiver
Unit
Copper
plate
Signal cable
Power cable
of other set
Separate
physically