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6. MAINTENANCE, TROUBLESHOOTING
6-6
6.6 Easy Troubleshooting
This section provides troubleshooting procedures that the user may follow to
restore normal operation. If you cannot restore normal operation, do not attempt
to check inside any unit. Any repair work is best left to a qualified technician.
Easy troubleshooting procedures
Problem Cause Remedy
Key beep inaudible Key beep turned off
Adjust key beep level on the OPERATION menu,
referring to section 1.43.
Picture not updated or
picture freeze. 30
seconds after the
picture freezes, the
buzzer sounds, the
[ALARM ACK] key
blinks and alarm
signal is output.
Video freeze Turn the power off and on again to restore normal
operation.
Power is ON but
nothing appears on
monitor.
Brilliance is too low. Keyboard-type control unit: Turn BRILL control
clockwise to increase the brilliance.
Trackball-type control unit: Press any one of
F1-F4 for five seconds to increase the brilliance to
"50".
Marks, indications and
noise appear but no
echo
Tx high voltage
protection circuit has
activated.
Reset the power to restore normal operation.
Range changed but
radar picture does not
change
Defective range key
or video freeze up
Try to hit RANGE [+] and [-] keys (or RANGE box)
several times. (If unsuccessful, replacement of
keypad may be required in case of the
keyboard-type control unit.) If that does not work
try to turn the power off and on again to see if the
problem might be video freeze up.
Only 2 PI lines when 6
lines are wanted
Incorrect setting of
PI line interval
Incorrect setting of PI line interval. Adjust PI line
interval, referring to section 1.31.2. Also, the
setting for number of PI lines to display may be
inappropriate. Check the menu setting for number
of PI lines, referring to section 1.31.4.
Range rings are not
displayed
Range rings turned
off
Try turning on the range rings with 0 RINGS in the
MARK menu. If they do not appear, their brilliance
may be too low. Adjust their brilliance at page 1 of
the BRILL menu.
Tracked target not
tracked correctly
Poor definition of
targets in sea clutter
Adjust A/C SEA and A/C RAIN referring to section
1.17 and 1.18.
Tuning adjusted but
poor sensitivity
2
nd
trace echo
rejector on or dirt on
radiator face
• Turn off the 2
nd
trace echo rejector, referring to
section 1.38.
• Clean the radiator face.