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12-1
12. MAINTENANCE,
TROUBLESHOOTING
This section provides maintenance and troubleshooting procedures that the user can
follow to get optimum performance from the equipment. Before attempting any main-
tenance or troubleshooting procedure please review the safety information below. If
you cannot restore normal operation after following the troubleshooting procedures do
not attempt to check inside the equipment; have a qualified technician check the set.
12.1 Maintenance
Check the items shown in the table below regularly to prevent unnecessary trouble.
Check item Check point Remedy
Antenna unit Check for loosened and
corroded bolts.
Tighten loosened bolts. Replace heavily
corroded bolts.
Cable Check that cables are tight-
ly fastened, free of corro-
sion and not damaged.
Connect cable if it has loosened. Replace
damaged cables.
DIsplay unit
connector
Check if tightly fastened. Fasten if loosened.
Ground Check for tight connection
and rust.
Fasten if loosened. Remove rust if
present.
Display unit Dust on the cabinet, LCD Remove dust from the cabinet with a dry
clean cloth.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 tissue 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 commercial cleaners to clean
the equipment. Those cleaners can re-
move paint and markings.
Transducer Face of transducer Marine life and growth on the transducer
can lower sensitivity. Remove any foreign
material from the face of the transducer
with a wooden stick or fine sandpaper.
IMPORTANT
Do not apply paint, anti-corrosive sealant
or contact spray to coating or plastic parts.
Those items contain organic solvents that can
damage coating and plastic parts, especially
plastic connectors.
WARNING
ELECTRICAL SHOCK HAZARD
Do not open the equipment.
Only qualified personnel can work
inside the equipment.