Furuno NAVNET 1833 - Manual (Page 214)

7. MAINTENANCE, TROUBLESHOOTING
7-2
7.3 Replacement 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.
7.4 Trackball 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