Furuno NX-300-D, Operator'S Manual

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5-2
7. Press the [ENT] key to start the test. The equipment checks ROM, RAM, SIO and internal
battery, and the results are individually displayed as OK or NG (No Good). Program
numbers appear at the bottom of the display.
Note 1: SIO requires a special connector to check. “03” appears as the result when no
connector is connected.
Note 2: CNT is the number of times test has been consecutively executed.
Program no.
Figure 5-2 TEST display
After the equipment has checked the items shown in Figure 5-2, a beep sounds and the
message PUSH KEY appears at the top right-hand corner.
8. Press each key one by one. The name of the key pressed momentarily appears at the top
of right-hand corner if the key is functioning properly.
Note: If no key is pressed within approx. five seconds, the equipment automatically
displays the following message to inform you that it is now going to check the LCD.
Figure 5-3 LCD CHECK display
9. The test repeats. Turn off the power to stop the test.
5.3 When the Battery Icon Appears
A lithium battery (type: CR2354-1F2, code no.: 000-142-305) is installed on the circuit board
inside the display unit, and it preserves data when the power is turned off. The life of the battery
is about 5-10 years. Its voltage is checked when the power is turned on. When its voltage is low
the battery icon appears on the display to alert you. When this happens, contact your dealer to
request replacement of the battery.
Note: When the battery is dead, all default settings are restored.