Furuno FR-7112 - Manual (Page 35)

5-1
5. MAINTENANCE & TROUBLESHOOTING
This chapter tells you how to keep your radar in
good working order. Before reviewing this
chapter please read the safety information
which follows.
5.1 Preventive Maintenance
Regular maintenance is important for good
performance. Always keep the equipment as
free as possible from dirt, dust, and water
splashes. Make sure all screws securing the
components are properly tightened.
A maintenance program should be established
and should at least include the items listed in
Table 5-1.
5.2 Replacing the Fuse
The fuse in the fuse holder at the back of the
display unit 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 an incorrect
fuse - serious damage to the equipment may
result and void the warranty.
FR-7062/7112 is shipped with a 15 A fuse for
12 V ship's mains. If the ship's mains is 24/32 V,
change the fuse to 10 A (supplied).
FR-7252 is supplied with a 10 A fuse for 24/32
V ship's mains.
Table 5-1 Recommended maintenance program
Period Item Check point Remarks
Exposed
nuts and
bolts on
scanner unit Check for corroded or loosened
nuts and bolts. If necessary, clean
and repaint them thickly. Replace
them if heavily corroded. Sealing compound may be used
instead of paint. Apply a small
amount of grease between nuts and
bolts for easy removal in future.
Scanner
radiator Check for dirt and cracks on
radiator surface. Thick dirt should
be wiped off with soft cloth
dampened with fresh water. If a
crack is found, apply a slight
amount of sealing compound or
adhesive as a temporary remedy,
then call for repair. Do not use plastic solvent (acetone)
for cleaning. If you need to remove
ice from scanner unit, use a wooden
hammer or plastic head hammer.
Crack on the unit may cause water
ingress, causing serious damages to
internal circuits.
3 to 6
months
CRT The CRT will, in time, accumulate a
coating of dust which tends to dim
the picture. Wipe CRT lightly with
soft cloth to remove dust. Do not use chemical cleaners to
clean the CRT; they can remove
CRT coating.
6 months
to 1 year Display unit
connectors Check for tight connection and
corrosion. If corroded, contact your dealer for
replacement.