Trackball Maintenance; How To Clean The Filter In The Processor Unit - Furuno FCR-21x9-BB Operator's Manual

25. MAINTENANCE AND TROUBLESHOOTING
25.3

Trackball Maintenance

If the cursor moves abnormally, dust or dirt may be on the trackball. Clean the trackball
as shown below.
1. Turn the retaining ring on the trackball module counterclockwise 45° to unlock it.
Retaining
ring
2. Remove the retaining ring and ball.
3. Clean the ball with a soft, lint-free cloth. Blow carefully into the ball-cage to dis-
lodge dust and lint.
4. Look for a build-up of dirt on the metal rollers. If dirty, clean the rollers using a cot-
ton swab moistened lightly with isopropyl-rubbing alcohol.
5. Make sure that fluff from the swab is not left on the rollers.
6. Re-set the ball and retaining ring. Be sure the retaining ring is not inserted re-
versely.
25.4

How to Clean the Filter in the Processor Unit

Have a qualified technician clean the air inlet filter in the Processor Unit when it be-
comes dusty. Remove the filter and clean it with water and a mild detergent. Rinse the
filter, allow it filter to dry then return it to the Processor Unit.
Note 1: Be sure the air inlet is not blocked. A blocked inlet can cause the temperature
to rise inside the cabinet, which can lead to malfunction.
Note 2: The right side of the Processor Unit has an exhaust vent. Remove dust from
the vent as necessary.
25-4
Air inlet
Processor unit, left side
Filter