Replacement Of Fuse, Battery; Simple Troubleshooting - Furuno GP-1850WD Operator's Manual

12. MAINTENANCE & TROUBLESHOOTING
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
5 A fuse. Using the wrong fuse will damage
the unit and void the warranty.
CAUTION
Use the correct fuse.
Use of a wrong fuse can cause fire or
damage the equipment.
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 90 seconds.
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
Simple troubleshooting (plotter)
If ...
A battery installed on the 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 (
When this happens, contact your dealer to
request replacement of the battery.
Type
Lithium CR2450-F2 ST2L
Battery
Note : Use only the specified battery. Use of
an incorrect battery may cause
explosion. Dispose of the battery in
accordance with local regulations.

12.3 Simple Troubleshooting

Below are simple troubleshooting
procedures which the user can follow to
restore normal operation.
Then ...
check for blown fuse.
check that the power connector is firmly tightened.
check for corrosion on power cable connector.
check for damaged power cable.
check ship's battery for proper voltage output (12/24
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.
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 DISPLAY UNIT.
enter TD offset on the GPS/DGPS/TD OPTIONS
menu.
try to decrease GPS speed smoothing setting on the
GPS/DGPS/TD OPTIONS menu.
) appears on the display.
Code Number
000-144-941