Furuno NAVNET GD-1920C - Manual (Page 202)

8. MAINTENANCE, TROUBLESHOOTING
8-3
8.4 Replacing the Magnetron
When the magnetron has expired, distant targets cannot be seen on the display. When you
feel that long range performance has decreased, contact a FURUNO agent or dealer about
replacement of the magnetron.
Radar model and magnetron used
Model Magnetron Type Code No.
MODEL 1824C E3588 000-146-866
E3571 000-146-867
MG4004 000-158-895
MODEL 1834C
MODEL 1934C
MAF1421B 000-158-786-10
000-146-871
MAF1422B
000-158-788-10 MODEL 1944C
MG4006 000-158-896
MODEL 1954C MAF1425B 000-158-790-10
MODEL 1964C M1458F 000-158-780-10
8.5 Replacing the Synchro Belt (1824C only)
When the synchro belt of MODEL1824C has worn out, the sweep is not synchronized with
antenna rotation, which results in an abnormal picture.
When you suspect that the synchro belt has worn out, contact a FURUNO agent or dealer
about replacement. (Type: 40 S2M 266UG, Code No.: 000-808-743)
8.6 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.
Part Type Code No.
Retainer ring and ball MU3721 000-144-645
Retainer Ring