Furuno GP-1640F, Operator'S Manual, Page: 92 / 108

13-2
13.2 Replacement of Fuse,
Battery
The fuse on the power cable protects the
system from reverse polarity of the ship’s
mains and equipment fault. If the fuse blows,
find the cause before replacing it. Use only a
3 A fuse. Using the wrong fuse will damage the
unit and void the warranty.
A battery installed on a circuit board inside
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 the
battery icon (
) appears on the display. When
this happens, contact your dealer to request
replacement of the battery.
Use the correct fuse.
Use of a wrong fuse can cause fire or
equipment damage.
CAUTION
Type Code Number
Lithium battery CR2450-F2 ST2L 000-144-941
13.3 Simple Troubleshooting
Below are simple troubleshooting procedures
which the user can follow to restore normal
operation.
Table 13-2 Simple troubleshooting (plotter)
If… Then…
Check for blown fuse.
Check that the power connector is firmly tightened.
Check for damaged power cable.
You cannot turn on the power
Check battery for proper voltage output (10.8 to 31.2 V).
Power is on but nothing appears
Press the [POWER/BRILL] key and then the cursor pad to adjust
display brilliance and tone.
There is no response when a key is
pressed
Turn on the power again.
Check for loosened antenna connector.
Position is not fixed within
3 minutes.
Check GPS receiver status indication.
Check that the correct geodetic chart system is selected on the
GPS/DGPS/TD OPTIONS menu.
Position is wrong
Enter GPS position offset on the GPS/DGPS/TD OPTIONS menu.
Track is not plotted Plotting is stopped. (“H” appears on the plotter display.)
Bearing is wrong
Check that correct magnetic variation is entered on the DISPLAY
OPTIONS menu.
Loran or Decca TDs do not appear
Check that proper Loran or Decca chain codes are entered on the
GPS/DGPS/TD OPTIONS menu.
Loran TDs are wrong Enter TD offset on the GPS/DGPS/TD OPTIONS menu.
Ship’s speed display is not zero
after ship is stopped Try to decrease GPS speed smoothing setting on the
GPS/DGPS/TD OPTIONS menu.