Furuno BACK GP-80 - Manual (Page 66)

9-2
9.2 Preventative Maintenance
Regular maintenance is necessary to maintain
performance. Check the items mentioned be-
low monthly to keep the equipment in good
working order.
Antenna unit
Check for fixing bolts for tightness.
Antenna cable
Check connector for tight-
ness, rust, damage and wa-
ter 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 re-
placing the fuse. If the fuse blows after re-
placement, request service.
9.3 Error Messages
Error messages appear on the display to alert
you to possible trouble.
GPS error
When GPS signal is suddenly lost and posi-
tion cannot be calculated within one minute
the message shown in Figure 9-5 appears.
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 an-
tenna cable is disconnected.
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 ap-
pears.
Figure 9-6 DOP error message
WARNING
Use only a 2A fuse in the power cable.
Use of different fuses may cause fire.
WARNING
Do not open the display unit cover.
High voltage exists inside.
If the unit is not working properly,
contact your dealer.
GPS No fix
DOP Error