6. MAINTENANCE, TROUBLESHOOTING
6-5
6.6 Advanced-level Troubleshooting
This section describes how to cure hardware and software troubles that should be car-
ried out by qualified service personnel.
Note 1: This radar equipment contains complex modules in which fault diagnosis and
repair down to component level are not practicable by users.
Note 2: When replacement of the SPU board is necessary, the previous settings can
be transferred to new SPU board as follows:
• Save your settings to a SD-card, referring to section section 1.52.
• After replacing the SPU board, load the entire contents of the SD-card to the radar,
referring to section section 1.52 for the procedure.
Range rings are not displayed Range rings are turned off Try turning on the range rings
with [RANGE RING] in the
[NAVTOOL] menu. If they do
not appear, their brilliance may
be too low. Adjust their bril-
liance in the [BRILL] menu.
Tracked 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.
Tuning adjusted but poor sensi-
tivity
Second trace echo rejector
on or dirt on radiator face
• Disable the second trace
echo rejector, referring to
section 1.28.
• Clean the radiator face.
Problem Possible cause Remedy
Cannot turn power on. 1) Blown fuse.
2) Mains voltage/polarity.
3) Power supply board.
1) Replace blown fuse.
2) Correct wiring and input voltage.
3) Replace power supply board.
Brilliance adjusted but
no picture.
SPU board Replace SPU board.
Antenna not rotating. 1) Antenna drive mecha-
nism
2) Defective antenna drive
motor relay
1) Replace antenna drive mechanism.
2) Press relay reset button.
Data and marks not
displayed in Transmit
status
SPU board Replace SPU board.
Adjust GAIN with A/C
SEA set at minimum.
Marks and indications
appear but no noise or
echo.
1) IF amplifier
2) Signal cable between an-
tenna and processor unit
3) Video amplifier board
1) Replace IF amplifier.
2) Check continuity and isolation of coax-
ial cable.
Note: Disconnect the plug and lugs at
both ends of coaxial cable before
checking it by ohmmeter.
3) Check video coax line for secure con-
nection. If connection is good, replace
SPU board.
Problem Possible cause Remedy
To Next Page
Loading...
Need help?
General
