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9. MAINTENANCE & TROUBLESHOOTING
9-2
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 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 (Type: FGBO-A 2A AC125V,
Code No.: 000-549-062) 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.
Battery
A battery installed on the NP board inside
the display unit preserves date when the
power is turned off. The life of the battery is
about three years. When the battery voltage
is low “NG” appears on the start-up display.
When this happens, contact your dealer to
request replacement of the battery.
Type Code Number
Lithium
Battery
CR2450-F2ST2L 000-144-941
9.3 Error Messages
Error messages appear on the display to
alert you to possible trouble.
GPS error
When the GPS signal is suddenly lost and
position cannot be calculated within one
second 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.
Error message disappears automatically
when normal operation is restored.