Troubleshooting - Furuno CI-68 Operator's Manual

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.
If...
nothing appears on the screen when the
power switch is pressed
ship's track is not displayed
bottom echo is not shown on the echo
level display
echo display is interrupted
tide data is unstable
interference is present
4. MAINTENANCE & TROUBLESHOOTING
Troubleshooting table
check that the power cable is firmly connected.
The fuse may have blown. Request replacement of
the fuse.
adjust brilliance.
turn on SHIP TRACK in the DISP2 menu.
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.
suspect poor measuring conditions.
bottom is covered with sludge or the like.
marine life may be adhering to the transducer.
adjust tide average on the MENU 1 menu.
check ground for corrosion.
check if the cables of other equipment are near the
transducer cable.
Then...
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