3. MAINTENANCE, TROUBLESHOOTING
3-9
3.7 Replacement of Fuse
The 3 A fuse on the POWER Board inside the processor unit protects the
equipment from overcurrent and reverse polarity of the power supply. If the fuse
blows, have a qualified technician check the fuse.
WARNING
Use the proper fuse.
Use of a wrong fuse can result in damage
to the equipment or cause fire.
3.8 Error Messages
The alarm sounds for equipment error and is accompanied by a flashing popup
indication. Press any key to silence the alarm and erase the popup. Find the
cause for the alarm(s) as follows:
1. Press the [MENU] key to open the menu.
2. Choose MESSAGES and then press the [ENT] key. The latest alarm is at the
top of the list.
MESSAGES
GPS DATA ERROR!
Message display
3. Press the [DISP] key to close the menu.
Error messages
Error Message Meaning Remedy
ABORTING!
GPS heading error continues for
one minute. For example, satellite
cannot be acquired because of
unfavorable environment.
Check for obstruction.
ABORTING CALC! GPS signal lost for one minute.
Press any key to try to restore
normal operation.
BACKUP ERROR!(DISP)
Corrupted backup data found in
display unit at power on.
Default settings are
automatically restored.
BACKUP
ERROR!(PRCSSR)
Corrupted backup data found at
processor unit at power on.
Default settings are
automatically restored.
(Continued on next page)
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