Replacing The Magnetron; Replacing The Synchro Belt (1824C Only); Trackball Maintenance - Furuno NAVNET GD-1920C Operator's Manual

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.
Model
MODEL 1824C
MODEL 1834C
MODEL 1934C
MODEL 1944C
MODEL 1954C
MODEL 1964C
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
Retainer ring and ball
Radar model and magnetron used
Magnetron Type
E3588
E3571
MG4004
MAF1421B
MAF1422B
MG4006
MAF1425B
M1458F
Type
MU3721
8. MAINTENANCE, TROUBLESHOOTING
000-146-866
000-146-867
000-158-895
000-158-786-10
000-146-871
000-158-788-10
000-158-896
000-158-790-10
000-158-780-10
Code No.
000-144-645
Code No.
Retainer Ring
8-3