Furuno 1953C-BB manual Preventive Maintenance, Replacement of the battery, Maintenance program

7.MAINTENANCE, TROUBLESHOOTING

This chapter provides information necessary for keeping your unit in good working order and remedying simple problems.

WARNING

Do not open the equipment.

Hazardous voltage which can cause electrical shock exists inside the equipment. Only qualified personnel should work inside the equipment.

7.1Preventive Maintenance

Regular maintenance is important for optimum performance. A maintenance program should be established and should at least include the items shown in the table below.

Maintenance program

Item	Check point	Remedy
Connectors of	Check for tight connection.	Tighten loosened connectors.
processor unit
and control unit
Ground	Check for tight connection	Clean or replace ground wire as
terminal	and corrosion.	necessary.

7.2Replacement

7.2.1Replacement of the battery

A lithium battery (Type CR2450-F2 ST2L, Code No. 000-144-941) fitted on a circuit board inside the processor unit preserves data when the equipment is turned off, and its life is about three years. When its voltage is low the battery icon () appears at the top of the display. When the icon appears, contact your dealer to request replacement of the battery.

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