Maintenance, Troubleshooting; Maintenance; Cleaning The Display Unit; Transducer Maintenance - Furuno LS-4100 Operator's Manual

3. MAINTENANCE,

TROUBLESHOOTING
WARNING
ELECTRICAL SHOCK HAZARD
Do not open the equipment.
Only qualified personnel should work
inside the equipment.
3.1 Maintenance
Regular maintenance is essential for
good performance. Checking the items
listed in the table below monthly will
help keep your equipment in good
shape for years to come.
Checking
Item
Transducer Check cable for damage.
cable
Power cable, Check that they are tightly
transducer fastened. Refasten if
cable plug necessary.
Display unit Check for corrosion. Clean
ground if necessary.
Power supply Check voltage. If out of
voltage rating correct problem.
3.2 Cleaning the Display
Unit
Dust or dirt on the display unit can be
removed with a soft cloth. If desired, a
water-moistened cloth may be used.
Use special care when cleaning the
LCD since it scratches easily. Do not
use chemical cleaners to clean the
display unit - they can remove paint and
markings.
Action
21
3.3 Transducer
Maintenance
Marine life on the transducer face will
result in a gradual decrease in
sensitivity. Check the transducer face
for cleanliness each time the boat is
dry-docked. Carefully remove any
marine life with a piece of wood or
fine-grade sandpaper.

3.4 Replacing the Fuse

The fuse in the power cable protects the
system from reverse polarity of the
power supply and equipment fault. If the
fuse blows, find the cause before
replacing it. Use only a 1A fuse (FGMB
1A 125V, Code No. 000-114-805) or
equivalent. Using the wrong fuse will
damage the unit and void the warranty.
WARNING
Use the proper fuse.
Fuse rating is shown on the equipment.
Use of a wrong fuse can result in fire and
damage the equipment.

3.5 Battery Voltage Alert

A battery icon appears when the battery
voltage is too high or too low.
Battery icon and meaning
Icon
Voltage is lower than 10 VDC. If the
voltage goes below 9 V, the equipment
is automatically turned off.
Voltage is higher than 16.5 VDC. If the
voltage goes higher than 17.5 V, the
equipment is automatically turned off.
Meaning