Furuno FE-700 - Manual (Page 29)

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6 MAINTENANCE, TROUBLESHOOTING
Do not open the cover.
There are no user-serviceable parts inside.
Refer any repair work to a qualified
technician.
WARNING
6.1 Checking
Regular maintenance is essential for good
performance. Checking the items listed in the
table below on a regular basis will keep the
equipment in good shape for years to come.
Item Action
Cable run
If conductors are
exposed, replace
cable.
Power cable,
transducer cable plug If loosened, tighten.
Display unit ground If corroded, clean.
Ship's mains voltage If out of rating, correct
problem.
6.2 Cleaning the Display Unit
Dust or dirt on the display unit should be
removed with a soft cloth. If desired a
water-moistened cloth may be used. Do not use
chemical cleaners; they can remove paint and
markings.
6.3 Transducer Maintenance
Marine life on the transducer face will result in a
gradual decrease in sensitivity. Check the
transducer face for cleanliness each time the
ship is dry-docked. Carefully remove any marine
life with a piece of wood or fine-grade sandpaper.
6.4 Replacing the Fuse, Battery
If a fuse blows, find the cause before replacing it.
Use only designated fuses. Using the wrong fuse
will damage the unit and void the warranty.
Three types of fuses are used in the distribution
box FE-702.
For Display Unit : 3 A x 1 pc (24 VDC)
For Digital Depth Indicator: 0.5 A x 2 pcs
For AC input: 1 A x 2 pcs
The Digital Depth Indicator FE-720 uses one fuse
of 1 A, which is inserted in the positive line of
interconnection cable.
A battery installed on a circuit board inside the
display unit preserves data when the power is
turned off. The life of the battery is about three
years. When the battery voltage is low, “battery”
NG appears at the self-test. When this happens,
contact your dealer to request replacement of the
battery.
TYPE Code Number
Lithium Battery CR2450-F2 ST2 000-133-495