Furuno FR-8122 EU - Manual (Page 103)

6. MAINTENANCE & TROUBLESHOOTING
6-4
6.5 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 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 with a cotton swab moist-
ened 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.
DIsplay unit
Trackball maintenance parts are available as below.
Part Type No. Code No.
Retainer ring and ball MU3721 000-144-645
Trackball
ENTER
TARGET
ALARM
CANCEL
HL OFF
TLL MENU
EBL
ZOOM OFF
CENTER
TRAILS
VRM
F1
F2
PUSH AUTO/MAN
PUSH AUTO/MAN
PUSH AUTO/MAN
STBY
TX
MODE
CUSTOM
+
RANGE
-
BRILL
GAIN
A/C SEA
A/C RAIN
Retainer ring