Replacement Of Fuse; Trackball Maintenance - Furuno 1823C Operator's Manual

7. MAINTENANCE, TROUBLESHOOTING
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¥. Using the wrong fuse will damage the
equipment and void the warranty.
1823C, 1833C, 1933C, 1943C: 15A for 12V device, 7A for 24V device
1953C, GD-1900C: 7A for 12/24 V device
Power supply unit PSU-005 (1953C): 15A for 12V device, 7A for 24V device
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.
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.
Retainer ring and ball
7-2
CAUTION
Use the proper fuse.
Use of a wrong fuse can cause fire or
damage the equipment.
Display unit
Type
Part
MU3721
Retainer Ring
Code No.
000-144-645