Diagnostics - Furuno FAR-2218-BB Operator's Manual

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. Note that the normal radar picture is lost during this
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 SC Card inserted into the
Processor Unit. Press the F4 key three times to save a screenshot.
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
1) Slots in rotating disc in
antenna unit
2) Motor brushes
6. MAINTENANCE, TROUBLESHOOTING
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.
1) Remove foreign material (carbon,
grease, etc.) from slots.
2) Replace motor brushes if they are
shorter than 6 - 7 mm.
Processor Unit and
Control Unit
diagnostic test
results appear here.
6-7