Raymarine GPS navigation - Manual (Page 71)

SECTION4
MAINTENANCE
4.1 General
Maintaining satisfactory operation of your NAV 398 can depend on how well
you care for the equipment. The simple maintenance tips that follow can
save you time and money, as well as prevent unnecessary premature failures.
l
Always keep the equipment as clean as possible.
Use a soft clean cloth for cleaning the surface filter, control panel, etc. Do
not use abrasive cleansers, chemical cleaners or solvents. Use glass cleaners
or a suitable general purpose detergent.
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Periodically check the system hardware.
Inspect antennas and mounts, making sure all components are free of
corrosion and mounted securely. Examine all cables for evidence of chafing
or abrasions. Make sure connections to the ship’s DC power and RF ground
system are clean and tight. A light coating of a high insulation silicon grease
(such as Dow Corning DC-4) on connector pins can protect the plug contacts
from corrosion.
4.2 Replacing The Fuse
Your NAV 398 has its fuse protection in the power cable assembly. The fuse
is a 2 amp fuse and protects the ship’s DC power line in the event of an over
current condition in the NAV 398. A replacement fuse is included with the
spare parts supplied with your NAV unit.
If the NAV 398 will not turn “ON”, the fuse should be checked and replaced,
if necessary. The fuse is released from the fuse holder by gripping each end
of the fuse holder assembly, slightly press the two sections together, and then
apply a half twist counter-clockwise to the cap end. After replacing the fuse
in the holder re-assemble the fuse holder by applying pressure in the reverse
direction.
MAINTENANCE