Furuno FS-1562 Manual page 289

FELCOM 80
Modification when using DC Step Type Gyrocompass
If DC step type gyrocompass is used, modification of the communication unit is
required to prevent the fuse of the gyrocompass from being blown.
Modification in the field
Disconnect the plug mated to J3 on the LED PANEL board (16P0087) at the back side
of the front panel of the communication unit. And change the setting of the slid switch
S1 on the LED PANEL board.
H1-13