Trackball Maintenance; Easy Troubleshooting - Furuno FAR-2218-BB Operator's Manual

6. MAINTENANCE, TROUBLESHOOTING
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 lightly 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
Key beep inaudible.
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.
Power is ON but nothing appears
on monitor.
Marks, indications and noise ap-
pear but no echo.
Range changed but radar picture
does not change.
Only two PI lines when six lines
are wanted
6-4
Possible cause
Key beep turned off.
Video freeze.
Brilliance is too low.
Tx high voltage protection
circuit has activated.
Defective range key or video
freeze up.
Incorrect setting of PI line in-
terval
Retaining ring
Remedy
Adjust key beep level in the
[OPERATION] menu, referring
to section 1.10.
Turn the power off and on again
to restore normal operation.
Adjust the brilliance, referring to
section 1.3.
Reset the power to restore nor-
mal operation.
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.
Adjust PI line interval, referring
to section 1.40.2. 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 1.40.1.