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4 MAINTENANCE,<br />
TROUBLESHOOTING<br />
4.1 Preventive Maintenance<br />
WARNING<br />
ELECTRICAL SHOCK HAZARD<br />
Do not open the equipment.<br />
Only qualified personnel<br />
should work inside the<br />
equipment.<br />
Regular maintenance is important for good performance. A maintenance<br />
program should be established and should include the following points.<br />
• Check connectors and ground terminal on the processor unit and display unit<br />
for tightness.<br />
• Check ground terminal for rust. Clean or replace as necessary.<br />
• Check for water leakage in the antenna cable. Replace the cable if there are<br />
signs of water leakage.<br />
• Remove dust and dirt from the display unit (including LCD) and processor unit<br />
with a dry, soft cloth. Wipe the LCD carefully to prevent scratching, using<br />
tissue paper and an LCD cleaner. To remove stubborn dirt, use an LCD<br />
cleaner, wiping slowly with tissue paper so as to dissolve the dirt. Change<br />
paper frequently so the dirt will not scratch the LCD. Do not use chemical<br />
cleaners for cleaning - they can remove paint and markings.<br />
4-1
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