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4. MAINTENANCE & TROUBLESHOOTING
4-3
4.3 Troubleshooting
Below are simple troubleshooting procedures which the user may follow to try to restore
normal operation. If normal operation cannot be restored, do not attempt to check inside
any unit. Any repair work is best left to a qualified technician.
Troubleshooting table
If…
Then…
nothing appears on the screen when the
power switch is pressed
• check that the power cable is firmly connected.
• The fuse may have blown. Request replacement of
the fuse.
• adjust brilliance.
ship’s track is not displayed • turn on SHIP TRACK in the DISP2 menu.
bottom echo is not shown on the echo
level display
• check if the setting of ECHO RANGE in the MENU 1
menu is too low.
• bottom is deeper than measuring range.
• check setting of GAIN in the MENU1 menu.
echo display is interrupted • suspect poor measuring conditions.
• bottom is covered with sludge or the like.
• marine life may be adhering to the transducer.
tide data is unstable • adjust tide average on the MENU 1 menu.
interference is present • check ground for corrosion.
• check if the cables of other equipment are near the
transducer cable.