Advanced-Level Troubleshooting - Furuno FAR-2228-NXT Operator's Manual

6. MAINTENANCE, TROUBLESHOOTING
Problem
Range rings are not displayed
Tracked target not tracked cor-
rectly
Tuning adjusted but poor sensi-
tivity
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 MAIN board is necessary, the previous settings can
be transferred to new MAIN board as follows:
• Save your settings to a SD-card, referring to section section 1.55.
• After replacing the MAIN board, load the entire contents of the SD-card to the radar,
referring to section section 1.55 for the procedure.
Problem
Cannot turn power on.
Brilliance adjusted but
no picture.
Antenna not rotating.
Data and marks not
displayed in Transmit
status
Adjust GAIN with A/C
SEA set at minimum.
Marks and indications
appear but no noise or
echo.
6-6
Possible cause
Range rings are turned off
Poor definition of targets in
sea clutter
Second trace echo rejector
on or dirt on radiator face
Possible cause
1) Blown fuse.
2) Mains voltage/polarity.
3) Power supply board
(PWR1 and/or PWR2) in-
side the Processor unit.
MAIN board - inside the Pro-
cessor unit.
1) Antenna drive mecha-
nism
2) MTR-DRV board
MAIN board - inside the Pro-
cessor unit.
1) IF amplifier
2) Signal cable between an-
tenna and processor unit
Remedy
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.
Adjust A/C SEA and A/C RAIN
referring to section 1.20 and
section 1.21.
• Disable the second trace
echo rejector, referring to
section 1.29.
• Clean the radiator face.
Remedy
1) Replace blown fuse.
2) Correct wiring and input voltage.
3) Replace the faulty power supply
board.
Replace MAIN board.
1) Replace antenna drive mechanism.
2) Replace the MTR-DRV board.
Replace MAIN 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.