Diagnostics - Furuno FAR-2228-NXT Operator's Manual

6. MAINTENANCE, TROUBLESHOOTING
Problem
Poor discrimination in
range
True motion orientation
not working correctly
Target not tracked cor-
rectly
Buttons on trackball
module operated but
no response
Picture is not updated
with each sweep.
6.7

Diagnostics

A diagnostic test program is provided to test major circuit boards in the control unit,
processor unit and card I/F unit. During the test, alerts cannot be acknowledged and
the buzzer does not sound. Further, the normal radar picture is not visible. Take extra
caution regarding your surroundings when conducting the test.
Proceed as follows to execute the diagnostic test:
1. Open the [MAIN MENU].
2. Select [9 INITIAL SETTINGS].
3. Select [7 TESTS].
4. Select [2 DIAGNOSTIC TEST]. The system begins a diagnostic test.
The Processor Unit is tested first and the test results appear after a few moments.
You can save a screenshot to a SD Card if there is a SD Card inserted into the
Processor Unit. Press the F4 key three times to save a screenshot.
A keyboard test is available at the bottom of the test results, also. Press each key
on the control unit to highlight the corresponding area on-screen. Press the same
key again to remove the highlight.
6-8
Possible cause
Sea clutter control not func-
tioning properly
1) Incorrect menu setting
2) Speed entry incorrect
3) TM display inaccurate
Poor definition of targets in
sea clutter
Trackball module
Motor/gears
Remedy
Improper setting of A/C SEA. If A/C SEA is
seen only at very close range, suspect in-
accurate frequency of reference oscillator.
1) Referring to section 1.30, select TM
orientation mode.
2) Enter correct own ship speed referring
to section 1.12.
3) Make sure that speed and compass in-
puts are accurate.
Adjust A/C SEA and A/C RAIN referring to
section 1.20 and section 1.21.
Replace trackball module.
Check the motor and gears. Replace if
worn.