Replacement Of Fuse, Battery; Simple Troubleshooting - Furuno GP-1640 Operator's Manual

12.2 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.
If...
You cannot turn on the power
Power is on but nothing appears
There is no response when a key is
pressed
Position is not fixed within
3 minutes.
Position is wrong
Track is not plotted
Bearing is wrong
Loran or Decca TDs do not appear
Loran TDs are wrong
Ship's speed display is not zero
after ship is stopped
12-2
Table 12-2 Simple troubleshooting (plotter)
Check for blown fuse.
Check for corrosion on power cable connector.
Check for damaged power cable.
Check battery for proper voltage output (10.8 to 31.2 V).
Press the [POWER/BRILL] key and then the cursor pad to adjust
display brilliance and tone.
Turn on the power again.
Check for loosened antenna connector.
Check GPS receiver status indication.
Check that the correct geodetic chart system is selected on the
GPS/DGPS/TD OPTIONS menu.
Enter GPS position offset on the GPS/DGPS/TD OPTIONS menu.
Plotting is stopped. ("H" appears on the plotter display.)
Check that correct magnetic variation is entered on the DISPLAY
OPTIONS menu.
Check that proper Loran or Decca chain codes are entered on the
GPS/DGPS/TD OPTIONS menu.
Enter TD offset on the GPS/DGPS/TD OPTIONS menu.
Try to decrease GPS speed smoothing setting on the
GPS/DGPS/TD OPTIONS menu.
CAUTION
Use the correct fuse.
Use of a wrong fuse can cause fire or
equipment damage.
Lithium battery CR2450-F2 ST2L

12.3 Simple Troubleshooting

Below are simple troubleshooting procedures
which the user can follow to restore normal
operation.
Then...
Type Code Number
000-144-941