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8. MAINTENANCE, TROUBLESHOOTING
8-5
8.6 Troubleshooting
The table below provides common symptoms of equipment troubles and the
means to rectify them.
Symptom Check, Remedy
Cannot turn on the
power
•
Check power cable.
•
Check ship’s mains.
•
First check the fuse in the processor unit. If it is OK, have a
qualified technician check the fuse in the transceiver unit.
Bottom echo
becomes irregular
•
Rough seas. Distance to the bottom changes due to rolling and
pitching.
•
Long range selected. Transmission period is longer so ship’s
pitching and rolling are apt to affect detection of echo.
Weak echo
•
Output power set to minimum. Set TX OUTPUT (SONAR menu) to
maximum.
•
Excessive TVG. Readjust TVG NEAR and FAR on the SONAR
menu.
Somewhat strange
color
•
Brilliance too low. Adjust display brilliance.
Picture contains
noise
•
Equipment not grounded properly. Check equipment ground.
•
Power cable is too close to the signal cable. Relocate power cable
or signal cable.
•
Debris may be on sea surface. Reject unwanted noise with the
interference rejector on the SONAR menu.
Picture does not
change when tilt
angle is changed
•
Problem in tilt mechanism or control line. Contact a FURUNO agent
or dealer for advice.