How To Clean The Filter; How To Clean The Trackball In The Control Unit - Furuno FSV-25 Operator's Manual

8. MAINTENANCE, TROUBLESHOOTING
8.5

How to Clean the Filter

The units in the illustration below have vents with filters. Check the filters for dust ac-
cumulation and clean when necessary. If replacement of a filter is necessary contact
your dealer.
PROCESSOR UNIT
HULL UNIT
8.6

How to Clean the Trackball in the Control Unit

If the trackball does not roll smoothly it
may require cleaning. Do the following to
clean the trackball.
1. Turn the retaining ring on the track-
ball 45°.
2. Remove the retaining ring and ball.
3. Clean the ball with a soft lint-free
cloth.
4. Blow carefully into the ball-cage to dislodge dust and lint. Look for a build-up of
dirt on the metal rollers. If dirty, clean the rollers with 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.
8-6
Vent
Vent
(both sides)
TRANSCEIVER UNIT
CONTROL BOX EXTENSION BOX
Trackball
Vent
(both sides)
Vent
(both sides)
Retaining
ring