Raymarine GPS navigation User Manual download pdf (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.

Always keep the equipment as clean as possible.

Use a soft clean cloth for cleaning the surface filter, control panel, etc.

not use abrasive cleansers, chemical cleaners or solvents.

Use glass cleaners

or a suitable general purpose detergent.

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

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Raymarine GPS navigation User Manual Page 71