Furuno NAVNET 1823C - Manual (Page 220)

7. MAINTENANCE, TROUBLESHOOTING
7-2
7.2 Replacement of Batteries
Battery on circuit board
A lithium battery (Type CR2450-F2 ST2L, Code No. 000-144-941) fitted on a
circuit board inside the display 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.
Batteries in remote controller
The remote controller has two AA batteries. If the distance from which the
remote controller can be operated has decreased, change the battery.
Note: Replace all batteries together. Do not mix old and new batteries.
WARNING
Ensure battery polarity is correct.
Wrong polarity may cause the batteries to
explode.
7.3 Replacement of Fuse
The fuse on the power cable protects the equipment from reverse polarity of the
ship’s mains and equipment fault. If the fuse blows, find out the cause before
replacing it. Use the correct fuse¥. Using the wrong fuse will damage the
equipment and void the warranty.
1823C, 1833C, 1933C, 1943C: 15A for 12V device, 7A for 24V device
1953C, GD-1900C: 7A for 12/24 V device
Power supply unit PSU-005 (1953C): 15A for 12V device, 7A for 24V device
CAUTION
Use the proper fuse.
Use of a wrong fuse can cause fire or
damage the equipment.