Furuno Felcom 250 Service Manual page 240

S1:
MODEM (HUB)
Rest SW
S2:
DIP_SW for
Tx_FPGA
debugging
Note) As for
each LED,
refer to 10-37
Fig. 9.1.9 MODEM (16P0274) side A
Fig. 9.1.10 MODEM (16P0274) side B
9-5
9.1 Communication Unit: FB-2000
S3:
DIP_SW for
CPU debugging
S4:
DIP_SW for
Rx_FPGA debugging
U49: EEPROM
Store IMEA
S2, 3, 4: all OFF
RS-232C port