Users Manual Part 8

7. MAINTENANCE, TROUBLESHOOTING
7-6
7.6 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:
• For IMO-types, save your settings to a SD card, referring to section section 1.58.
For C-types, save your settings to a USB Flash memory, referring to section
section 1.60.
• After replacing the MAIN board, load the entire contents of the SD card to the radar,
referring to section section 1.58 for the procedure.
Problem Possible cause Remedy
Cannot turn power on. 1) Blown fuse.
2) Mains voltage/polarity.
3) Power supply board
(PWR1 and/or PWR2) in-
side the Processor unit.
1) Replace blown fuse.
2) Correct wiring and input voltage.
3) Replace the faulty power supply
board.
Brilliance adjusted but
no picture.
MAIN board - inside the Pro-
cessor unit.
Replace MAIN board.
Antenna not rotating. 1) Antenna drive mecha-
nism
2) MTR-DRV board
1) Replace antenna drive mechanism.
2) Replace the MTR-DRV board.
Data and marks not
displayed in Transmit
status
MAIN board - inside the Pro-
cessor unit.
Replace MAIN 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
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.
Marks, indications and
noise appear but no
echo (transmission
leak representing own
ship position is absent)
1) TX high voltage protec-
tion circuit has activated.
2) Magnetron
3) MD board inside the an-
tenna.
4) SPU board inside the an-
tenna.
1) Reset power to restore normal opera-
tion.
2) Check magnetron current.
Replace magnetron.
3) Replace MD board.
4) Replace SPU board.
Picture not updated or
picture freeze-up
1) Rotary Encoder inside
the antenna unit.
2) SPU board inside the an-
tenna.
3) Video freeze-up
1) Check the connection of signal cables.
2) Replace SPU board.
3) Turn the radar off, then on.