Furuno 1933, 1943, 1833 manual Replacement of Fuse, Trackball Maintenance

7. MAINTENANCE, TROUBLESHOOTING

7.3Replacement of Fuse

The fuse on the power cable protects the equipment from reverse polarity of the ship’s mains and equipment fault. If the fuse blows, find out the cause before replacing it. Use the correct fuse (10A for 12 V device, 5A for 24 V device). Using the wrong fuse will damage the equipment and void the warranty.

CAUTION

Use the proper fuse.

Use of a wrong fuse can cause fire or damage to the equipment.

7.4Trackball Maintenance

If the cursor skips or moves abnormally, you may need to clean the trackball.

1.Turn the retainer ring counterclockwise 45° to unlock it.

Retainer ring

Display unit

2.Remove the retainer ring and ball.

3.Clean the ball with a soft lint-free cloth, and 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 retainer ring. Be sure the retainer ring is not inserted reversely.

Note: Trackball maintenance parts are available as below.

Part	Type	Code No.
Retainer ring and ball	MU3721	000-144-645

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