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4.7 Replacement of Fuse<br />
4. MAINTENANCE, TROUBLESHOOTING<br />
The 3 A fuse on the POWER Board inside the processor unit protects the<br />
equipment from overcurrent and reverse polarity of the power supply. If the fuse<br />
blows, have a qualified technician check the fuse.<br />
4.8 Error Messages<br />
Use the proper fuse.<br />
WARNING<br />
Use of a wrong fuse can result in damage<br />
to the equipment or cause fire.<br />
The alarm sounds for equipment error and is accompanied by a flashing<br />
exclamation mark ( ). Press any key to silence the alarm. The exclamation<br />
mark remains on the screen until the cause for error is eliminated. Find the<br />
cause for the alarm(s) as follows:<br />
1. Press the [MENU] key to open the menu.<br />
2. Choose MESSAGES and then press the [ENT] key.<br />
MESSAGES<br />
GPS DATA ERROR!<br />
Message display<br />
3. Press the [DISP] key to close the menu.<br />
Error messages<br />
Error Message Meaning Remedy<br />
ABORTING! GPS heading error continues for<br />
one minute. For example, satellite<br />
cannot be acquired because of<br />
unfavorable environment.<br />
Check for obstruction.<br />
ABORTING CALC! GPS signal lost for one minute. Press any key to try to restore<br />
normal operation.<br />
BACKUP ERROR!(DISP) Corrupted backup data found in<br />
display unit at power on.<br />
BACKUP<br />
ERROR!(PRCSSR)<br />
(Continued on next page)<br />
Corrupted backup data found at<br />
processor unit at power on.<br />
Default settings are<br />
automatically restored.<br />
Default settings are<br />
automatically restored.<br />
4-9
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