UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED
ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL SUPPLEMENT 1
Rev.
2
3-4
Dec
8/08
3-4.1. Periodic Maintenance Inspections – Display Backlight
A. The display backlight lamp is rated by the manufacturer as having a usable life
of 20,000 hours. This life may be more or less than the rated time depending on operating
conditions of the 430W/530W, the backlight lamp may dim and the display may not
perform as well in direct sunlight conditions. The user must determine by observation
when the display brightness is not suitable for its intended use. Contact the authorized
repair station when the backlight lamp requires service.
3-4.2. Periodic Maintenance Inspections – Battery Replacement
A. The 430W/530W has an internal keep-alive battery that will last about 10 years.
The battery is used for GPS system information. Regular planned replacement is not
necessary. The 430W/530W will display a ‘low battery’ message when replacement is
required. Once the low battery message is displayed, the battery should be replaced within
1 to 2 months.
B. If the battery is not replaced and becomes totally discharged, the 430W/530W
will remain fully operational, but the GPS signal acquisition time may be increased. This
acquisition time can be reduced by entering a new seed position each time the unit is
powered on. There is no loss of function or accuracy of the 430W/530W unit with a dead
battery.
C. The battery must be replaced by a factory authorized repair station.
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