Replacing The Fuse/Battery; Troubleshooting - Furuno FE-800 Operator's Manual

3. MAINTENANCE AND TROUBLESHOOTING
3.5

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 five 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 or after changing the battery. In this case, the battery does
not need replacement, however the clock must be set.
Item
Lithium Battery
Glass Tube Fuse (for AC input, 2 pcs)
3.6

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.
SYMPTOM
Low voltage
No picture, no
reading Fuse blown
measure
Power cable damaged
Transducer cable damaged
No echo
sounding
Transducer cable connection
picture
loosened
Low sensitivity
Irregular Low reflectivity from seabed.
display
Marine life on transducer
Out of range
Loss of seabed
Air bubbles caused by going
display
astern or running over other
ships' wake
Wrong installation at the
transducer
Heavy noise
Other echo sounders nearby
Aeration in near surface water
Surface noise
Rough weather
"Not Connected" Communication between the
appears on the Display Unit and Transceiver unit
screen is interrupted or lost
BR-1225-A/BK
FGMB 250V 2A PBF
PROBABLE CAUSE
Type
Check the supply voltage.
Refer to section 3.5.
Repair the cable.
Repair the cable.
Tighten the connections.
Increase the gain (refer to section 1.7).
Suspect muddy seabed.
Remove marine life from the transducer when
dry-docked.
Check the range scale setting.
This is normal. It is not a sign of equipment
trouble.
Find cause of noise. Relocate the transducer
if noise persists.
If more than one echo sounder is working on
the ship, there is no ideal measure to cure the
problem.
Not an equipment problem.
Not an equipment problem.
Connection(s) may be loose or disconnected.
Check the connections between the Display
Unit and Transceiver unit. Tighten loose con-
nectors and re-connected disconnected con-
nectors.
37
Code Number
000-178-989-10
000-157-497-10
REMEDY