Preventive Maintenance; Error Messages - Furuno GP-90 Operator's Manual

9. MAINTENANCE & TROUBLESHOOTING
9.2

Preventive Maintenance

Regular maintenance is necessary to
maintain performance. Check the items
mentioned below monthly to keep the
equipment in good working order.
Antenna unit
Check for fixing bolts for tightness.
Antenna cable
Check connector for
tightness, rust, damage
and water leaks.
Power cable
Check for tight connection.
Ground terminal
Check for rust and tight connection.
Fuse
The 2A fuse in the power cable protects the
unit from overvoltage and equipment fault. If
the fuse blows, find out the cause before
replacing the fuse. If the fuse blows after
replacement, request service.
WARNING
Use only a 2A fuse in the power cable.
Use of different fuses may cause fire.
9-2
9.3

Error Messages

Error messages appear on the display to
alert you to possible trouble.
WARNING
Do not open the display unit cover.
High voltage exists inside.
If the unit is not working properly,
contact your dealer.
GPS error
When GPS signal is suddenly lost and
position cannot be calculated within one
minute the message shown in Figure 9-5
appears.
GPS No fix
Figure 9-5 GPS error message
This message may appear when there is an
interfering object between the satellite and
GPS receiver (for example, mast) or the
antenna cable is disconnected.
Press the [CLEAR] key to silence the buzzer.
If the [CLEAR] key is not pressed, several
beeps sound every three minutes.
DOP error
When PDOP value exceeds 6 in the 3D
mode, or HDOP value exceeds 4 in the 2D
mode, this error occurs and following
indication appears.
DOP Error
Figure 9-6 DOP error message