Furuno FAR-1416, Руководство оператора

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7. MAINTENANCE, TROUBLESHOOTING
7-7
Picture not updated or
picture freeze-up 1) Bearing signal generator
board (in antenna unit)
2) SPU board
3) Video freeze-up
1) Check the connection of signal cables.
2) Replace SPU board.
3) Turn the radar off, then on.
Incorrect orientation of
picture 1) Terminal board: RFTB/
RTB (inside transceiver
unit) or FRP_TB board
(inside display unit)
2) SPU board
If the message “HEADLINE” appears in or-
ange letters inside the alert box, the head-
ing signal is lost or interrupted. Check the
heading line signal cable and terminal
board connections. If there is no problem
with cables or connections, replace the
SPU board.
Cannot operate radar
from on-screen boxes SPU board Replace SPU board.
Radar is properly tuned
but poor sensitivity 1) Deteriorated magnetron
2) Detuned MIC
3) Dirt on radiator face
4) Second trace echo rejec-
tion is ON
1) With the radar transmitting on 48 nm
range, check magnetron current. If cur-
rent 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) Disable the second-trace echo rejector
referring to section 1.30.
Range changed but ra-
dar picture not chang-
ing 1) Defective range key
2) SPU board
3) Video freeze up
1) Adjust the range with the control unit,
or the [RANGE] box several times. If
unsuccessful, replacement of control
unit may be required.
2) Replace SPU board.
3) Turn off and on radar.
Interference rejector is
inoperative (IR level is
not displayed) SPU board Replace SPU board.
Echo stretch is ineffec-
tive (neither ES1, ES2
nor ES3 is displayed) SPU board 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) SPU board
1) Replace associated circuit board if un-
successful.
2) Replace SPU 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 1.12, select TM
orientation mode.
2) Enter correct own ship speed referring
to section 1.15.
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 1.19 and section 1.20.
Trackball control unit is
not responsed Trackball control unit Replace trackball control unit.
Problem Possible cause Remedy