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3. MAINTENANCE AND TROUBLESHOOTING
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3.4 Replacing the Fuse/Battery
If a fuse blows, find the cause before replacing it. Use only designated fuses. Using the wrong fuse
will damage the unit and void the warranty. Consult your dealer for replacement of the fuse.
A battery installed on a circuit board inside the transceiver unit preserves data when the power is
turned off. The life of the battery is about ten years. When the battery voltage is low, a warning
message "Displayed time may be incorrect. Please re-set the clock." appears after the self-test.
When this happens, contact your dealer to request a replacement of the battery. Press any key to
proceed to the main display screen.
Note: The message "Displayed time may be incorrect. Please re-set the clock." appears when the
FE-800 is turned on for the first time. In this case, the battery does not need replacement, however
the clock must be set.
3.5 Troubleshooting
The table below provides simple troubleshooting procedures which you may follow to restore
normal operation. If you cannot restore normal operation, contact your dealer.
3.6 Fan and LCD Backlight Life Expectancy
Item Type Code Number
Lithium Battery BR-1225-A/BK 000-178-989-10
Glass Tube Fuse (for AC input, 2 pcs) FGMB 250V 2A PBF 000-157-497-10
SYMPTOM PROBABLE CAUSE REMEDY
No picture, no
reading
measure
Low voltage Check the supply voltage.
Fuse blown Refer to section 3.4.
Power cable damaged Repair the cable.
No echo
sounding
picture
Transducer cable damaged Repair the cable.
Transducer cable connection
loosened
Tighten the connections.
Irregular
display
Low sensitivity Increase the gain (refer to section 1.7).
Low reflectivity from seabed. Suspect muddy seabed.
Marine life on transducer Remove marine life from the transducer when
dry-docked.
Loss of seabed
display
Out of range Check the range scale setting.
Air bubbles caused by going
astern or running over other ships’
wake
This is normal. It is not a sign of equipment
trouble.
Heavy noise
Wrong installation at the
transducer
Find cause of noise. Relocate the transducer
if noise persists.
Other echo sounders nearby If more than one echo sounder is working on
the ship, there is no ideal measure to cure the
problem.
Surface noise
Aeration in near surface water Not an equipment problem.
Rough weather Not an equipment problem.
Item Life Expectancy
Fan 60,000 hours at 60°C
LCD backlight 60,000 hours at 35°C