21
MAINTENANCE & TROUBLESHOOTING
Do not open the cover.
There are no user-serviceable parts inside.
Refer any repair work to a qualified
technician.
WARNING
WARNING

4.1 Checking

Regular maintenance is essential for good per-
formance. Checking the items listed in the
table below on a regular basis will keep the
equipment in good shape for years to come.
Table 4-1 Checking
metInoitcA
nurelbaCerasrotcudnocfI ecalper,desopxe .elbac
,elbacrewoP gulpelbacrecudsnart ,denesoolfI .nethgit
dnuorgtinuyalpsiD.naelc,dedorrocfI
niams'pihSs
egatlov ,gnitarfotuofI melborptcerroc.

4.2 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. Do not use chemical clean-
ers to clean the display unit; they can remove
paint and markings.
For screen, wipe the LCD carefully to pre-
vent scratching, using tissue paper and an
LCD cleaner. To remove dirt or salt deposits,
use an LCD cleaner, wiping slowly with tis-
sue paper so as to dissolve the dirt or salt.
Change paper frequently so the salt or dirt will
not scratch the LCD. Do not use solvents such
as thinner, acetone or benzene for cleaning.

4.3 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.

4.4 Replacing the Fuse

The fuse on the power cable protects the sys-
tem from reverse polarity of the ship’s mains
and equipment fault. If the fuse blows, find
the cause before replacing it. Use only a 3A
fuse. Using the wrong fuse will damage the
unit and void the warranty.
Use only a 3A fuse.
Use of a wrong fuse can result in equipment
damage and void the warranty.
WARNING
WARNING