Troubleshooting Procedures; Fuses - Garmin GNC 420 Maintenance Manual

3.3

TROUBLESHOOTING PROCEDURES

3.3.1

Fuses

Check for blown fuses on the Main Board, Com Board, and Nav Board as shown in Figures 3-1
through 3-4. If blown fuses are found, try to determine the cause of the fuse failure before
installing a new fuse.
F850
5A
F852
2A
F854
5A
F853
0.75A
F851
3A
Page 3-2
Rev. C
Figure 3-1. Main Board Fuse Locations
400 SERIES MAINTENANCE MANUAL
P/N 190-00140-05