6. MAINTENANCE, TROUBLESHOOTING
6-5
6.4 Trackball Maintenance
If the cursor skips or moves abnormally, clean the trackball using the procedure below.
1. Turn the retaining ring counterclockwise 45° to unlock
it.
2. Remove the retaining ring and ball.
3. Clean the ball with a soft, lint-free cloth, then blow
carefully into the ball-cage to dislodge dust and lint.
4. Look for a build-up of dirt on the metal rollers. If dirty,
clean the rollers using a cotton swab moistened light-
ly with isopropyl-rubbing alcohol.
5. Make sure that fluff from the swab is not left on the rollers.
6. Replace the ball and retaining ring. Be sure the retaining ring is not inserted re-
versely.
6.5 Easy Troubleshooting
This section provides troubleshooting procedures that the user can follow to restore
normal operation. If you cannot restore normal operation, do not attempt to check in-
side any unit. Any repair work is best left to a qualified technician.
Problem Possible cause Remedy
Key beep inaudible. Key beep turned off. Adjust key beep level in the
[OPERATION] menu, referring
to section 1.10.
Picture not updated or picture
freeze. 30 seconds after the pic-
ture 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. Adjust the brilliance, referring to
section 1.3.
Marks, indications and noise ap-
pear but no echo.
Tx high voltage protection
circuit has activated.
Reset the power to restore nor-
mal operation.
Range changed but radar picture
does not change.
Defective range key or video
freeze up.
Adjust the range with the con-
trol unit, or the [RANGE] box
several times.
If that does not work try to turn
the power off and on again to
see if the problem might be vid-
eo freeze up. If unsuccessful,
replacement of keypad may be
required.
Only two PI lines when six lines
are wanted
Incorrect setting of PI line in-
terval
Adjust PI line interval, referring
to section 1.40.3. Also, the set-
ting for number of PI lines to
display may be inappropriate.
Check the menu setting for
number of PI lines, referring to
section 1.40.2.
Retaining
ring
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