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3. MAINTENANCE, TROUBLESHOOTING
3.1 Maintenance
Regular maintenance is important for good performance. A maintenance program should be
established and should at least include the items listed in Table 3-1.
Table 3-1 Maintenance program
Period Item Check point Action
Fixing bolts for
antenna unit
Check for corrosion and if
tightly fastened.
Replace corroded bolts. Coat new
bolts with anticorrosive sealant.
Antenna unit
cleanliness
Check for foreign material.
(Foreign material on the
antenna unit can cause a
considerable drop in
sensitivity.)
Clean the antenna unit with a
freshwater-moistened cloth.
Alcohol may be used. Do not use
commercial cleaners to clean the
antenna unit; they can remove
paint and markings.
Antenna unit
cover
Check for cracks. Permanent
damage to the unit’s circuitry
will result if water leaks inside
If a crack is found, it should be
temporarily repaired by using a
small amount of sealing compound
or adhesive. The unit should then
be brought to your dealer for
permanent repairs.
3 to 6
months
LCD The LCD will, in time,
accumulate a coating of dust
which tends to dim the picture.
Wipe the LCD gently with a soft
cloth. Do not use commercial
cleaners to clean the LCD; they can
remove paint and markings.
6 months
to 1 year
Display unit
connectors
Check for tight connection and
corrosion.
If corroded, see your dealer about
replacement.
3.2 Replacing the Fuse
The fuse (5A) in the power cable protects the equipment against reverse polarity of ship’s mains,
overcurrent, and equipment fault. If the fuse blows, find the cause before replacing it. Never use a
fuse rated for more than 5A, since overfusing can cause serious damage to the equipment and void
the warranty.