6. MAINTENANCE, TROUBLESHOOTING
6-5
6.6 Advanced-level Troubleshooting
This section describes how to cure hardware and software troubles which the qualified
service persons must do.
Advanced-level troubleshooting
Problem
Probable cause or
check points
Remedy
Power cannot be
turned on.
1) Mains voltage/polarity
2) Power supply board
1) Correct the wiring and input
voltage.
2) Replace power supply
board.
Brilliance adjusted
but no picture.
1) SPU Board 1) Replace SPU board.
Antenna not rotat-
ing.
1) Antenna drive mechanism 1) Replace the antenna drive
mechanism.
Data and marks
not displayed in
transmit.
1) SPU board 1) Replace SPU board.
Set GAIN to maxi-
mum with A/C SEA
set at minimum.
Marks and indica-
tions appear but no
noise or echo.
1) Signal cable between an-
tenna and display unit
2) IF amplifier
3) Video amplifier board
1) Check continuity and isola-
tion of coaxial cable.
2) Replace IF amplifier.
3) Check coax line for fasten
connection. If connection is
good, replace SPU board.
Marks, indications
and noise appear
but no echo.
(Transmission leak
representing your
ship position is ab-
sent.)
1) Magnetron
2) Modulator board
3) SPU board
1) Check magnetron current.
2) Replace modulator board.
3) Replace SPU board.
Picture not updat-
ed or picture
freeze-up.
1) Bearing signal generator
2) SPU board
3) Video freeze-up
1) Check that signal cables
are fastened.
2) Replace SPU board.
3) Turn off and on the radar.
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