Furuno Ls4100 - Manual (Page 29)

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4. The ROM, RAM and NMEA port are
checked, with the results shown as
OK or NG (No Good). For any NG,
request service. (A special connector
is required to test the NMEA port.
Nothing appears if no connector is
connected.)
5. The squares at the right side of the
test display are for checking the
controls. Press each key and the
arrows on the Cursor Pad one by
one. A control’s corresponding
on-screen square “lights” in black if
the control is normal.
6. To return to the Installation menu,
press the [MENU/ESC] key three
times.
7. To restore normal operation, turn off
the power and turn it on again.
3.8 Test Pattern
This feature tests for proper display of
tones.
1. On the Installation menu, press▼ to
choose LCD PATTERN.
2. Press ► to start the test. The entire
screen is black.
3 Press ► again and the screen turns
white.
4. Press ► again and the screen
shows a four-toned display.
5. Press ► again to return to the
Installation menu.
6. To restore normal operation, turn off
the power and then it on again.
WHITE FOUR-TONE BLACK
Test patterns
3.9 Memory Clear
The memory can be cleared to start
afresh with default menu settings.
1. At the installation menu, press ▼ to
choose MEMORY CLEAR.
2. Press ► to open the options
window.
: YES
: NO
Clear memory display
3. Press ▲ to clear the memory. Beeps
are generated while the memory is
being cleared.
4. To restore normal operation, turn off
the power and then turn it on again.