6. MAINTENANCE, TROUBLESHOOTING
6-7
Cannot operate radar
from on-screen boxes
MAIN board - inside the Pro-
cessor unit.
Replace MAIN board.
Radar is properly tuned
but poor sensitivity
1) Deteriorated magnetron
2) Detuned MIC
3) Dirt on radiator face
4) Water ingress to the
waveguide or other feed-
er line
5) Second trace echo rejec-
tion is ON
1) With the radar transmitting on 48 nm
range, check magnetron current. If
current is below normal, magnetron
may be defective. Replace it.
2) Check MIC detecting current. If it is be-
low normal value, MIC may have be-
come detuned. MIC must be tuned.
3) Clean the radiator surface.
4) Remove water from the feeder line.
5) Disable the second-trace echo rejector
Range changed but ra-
dar picture not chang-
ing
1) Defective range key
2) SPU board inside the an-
tenna.
3) Video freeze up
1) Adjust the range with the control unit,
or the [RANGE] box several times. If
unsuccessful, replacement of keypad
may be required.
2) Replace SPU board.
3) Turn off and on radar.
Interference rejector is
inoperative (interfer-
ence rejection level not
displayed)
SPU board inside the anten-
na.
Replace SPU board.
Echo stretch is ineffec-
tive (neither ES1, ES2
nor ES3 is displayed)
SPU board inside the anten-
na.
Replace SPU board.
Range rings are not
displayed
1) Adjust the brilliance of
range rings on the BRILL
menu to see if intensity is
increased
2) MAIN board
1) Replace associated circuit board if un-
successful.
2) Replace MAIN board.
Poor discrimination in
range
Sea clutter control not func-
tioning properly
Improper setting of A/C SEA. If A/C SEA is
seen only at very close range, suspect in-
accurate frequency of reference oscillator.
True motion orientation
not working correctly
1) Incorrect menu setting
2) Speed entry incorrect
3) TM display inaccurate
1) Referring to section 1.30, select TM
orientation mode.
2) Enter correct own ship speed referring
3) Make sure that speed and compass in-
puts are accurate.
Target not tracked cor-
rectly
Poor definition of targets in
sea clutter
Adjust A/C SEA and A/C RAIN referring to
section 1.20 and section 1.21.
Buttons on trackball
module operated but
no response
Trackball module
Replace trackball module.
Picture is not updated
with each sweep.
Motor/gears
Check the motor and gears. Replace if
worn.
Problem
Possible cause
Remedy
Summary of Contents for FAR-2218
Page 132: ...1 OPERATIONAL OVERVIEW 1 110 This page is intentionally left blank ...
Page 176: ...3 TARGET TRACKING TT 3 36 This page is intentionally left blank ...
Page 202: ...4 AIS OPERATION 4 26 This page is intentionally left blank ...
Page 232: ...5 VIDEO PLOTTER OPERATION 5 30 This page is intentionally left blank ...
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