Furuno FE-700 manual MAINTENANCE, Troubleshooting, Transducer Maintenance, Checking

6 MAINTENANCE, TROUBLESHOOTING

WARNING

Do not open the cover.

There are no user-serviceable parts inside. Refer any repair work to a qualified technician.

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.

6.1 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,	If loosened, tighten.
transducer cable plug
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.

6.4 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

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