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5. Maintenance
The FM-2721 is designed to provide years of trouble-
free operation. It is, however, recommended to inspect
and maintain the following points to minimize the
possibility of equipment failure and assure optimum
performance. Be sure to disconnect the power cable at
the fuse holders before performing any maintenance
work.
5.1 Antenna Check
Since the antenna is exposed to direct sunlight and salt
water spray, it is subject to corrosion or salt water
immersion at the antenna base. Physical damage, such
as a crack, may occur under heavy ships vibration. If
cracks or water immersion is found, contact FURUNO
dealer for servicing.
5.2 Cleaning of Transceiver, Handset
Keep the transceiver and handset clean and dry at all
times. Dust or loose dirt accumulated on them should
be wiped off with a soft, dry cloth. Never use plastic
solvents, such as thinner or acetone for cleaning; they
may dissolve paint and markings.
Check all connectors for corrosion. If corroded, clean
the contact and re-tighten securely.
5.3 Fuse Replacement
A 10A fuse in the snap-in fuse holder on the power
cable protects the equipment from reverse polarity and
equipment fault. If the fuse has blown, first find the
cause of the problem before replacing it. Use only a
10A fuse; use of other fuses will damage the equipment
and void the warranty.
CAUTION
Use the proper fuse.
Use of a wrong fuse can cause fire or
equipment damage and void the warranty.
5.4 Battery Check
The FM-2721 operates normally at any voltage between
10.8 and 15.6 VDC. If the battery voltage is out of
ratings, check the battery liquid and the charging
system of your boat. Check also rust or corrosion at the
battery terminals and the ships mains switch-board for
poor contact.
49


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