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5 MAINTENANCE,
TROUBLESHOOTING
WARNING
ELECTRICAL SHOCK HAZARD
Do not open the equipment.
Only qualified personnel
should work inside the
equipment.
5.1 Maintenance
Routine maintenance
Regular maintenance is important for good performance. Check the following on a regular
basis to keep the equipment in good operating condition.
• Check that the connectors at the rear of the display unit are tightly fastened.
• Check the ground wire and ground terminal for rust. Clean if necessary. Confirm that the
ground wire is tightly fastened.
• Remove dust and dirt from the display unit and LCD with a dry, soft cloth. Do not use
chemical cleaners to clean any part of the display unit – they can remove paint and
markings.
• Wipe the LCD carefully o prevent scratching, using tissue paper and an LCD cleaner. To
remove dirt or salt deposits, use an LCD cleaner, wiping slowly with tissue paper so as
to dissolve the dirt or salt. Change paper frequently so the salt or dirt will not scratch the
LCD. Do not use solvents such as thinner, acetone or benzene for cleaning.
Fuse replacement
The 1.5 A 250 V fuse (AC type) or 3A 125V fuse (DC type) on the rear panel protects the
equipment from internal fault and overcurrent. If the fuse blows, find the cause before
replacing it. If the fuse blows again after replacement, request service.
WARNING
Use the proper fuse.
Use of a wrong fuse can cause fire or
damage to the equipment.