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Maintenance
Control PCB
AF SELECT
IC310
DC AMP
IC314
VOLUME
IC312 IC313
70cH AF
ALLcH AF
PA MUTE
Q307
HAIL-R AMP
IC314
SIREN OSC
OUT1
OUT2
DATA LINE SELECT
IC301-IC304
NMEA I/O
PC301 D305 Q308
SEATALK I/O
PC302 PC303
HANDSET I/O - 1
IC319 D307 D308
EEPROM
IC322
RX DATA
SELECT
AF PA
IC316
2.5V Vref
Q304
RESET
IC307
REG/SW
Vdet
VARISTOR
FSK MODEEM-2
IC309
VARISTOR
FSK MODEEM-1
IC308
3.58MHz
Q322-Q330
IC323 IC324
DSC OUT
ADJ
LINE SELECT
IC310
VARISTOR
AF MUTE-1
Q302
VARISTOR
AF MUTE-2
Q303
AF SELECT
LINE SELECT
AF MUTE
IDC
( 2/2 )
BUSY 1
DISC OUT
SQ OUT
CK DATA LE2
( 2/2 )
SP SELECT
RL301
Q306 D304
HAIL +
HAIL -
(EXT SP)
5V
IC306
D302
Q331
2.5V
Vref
ANALOG
CPU,DATA I/O
Vdet
+ B
18.423MHz
3.58MHz
MIC OUT
RX OUT
BEEP/ALERT
IC317
WRITE
NMEA
IC318
Q309-Q315
D306
SEATALK
HANDSET-1
TX DATA
RING DET
HOOK OFF
DATA
Q316 Q319 PC304 PC305
HANDSET I/O - 2
IC320 D309 D310
HANDSET-2
Q317 Q320 PC306 PC307
HANDSET I/O - 3
IC321 D311 D312
HANDSET-3
Q318 Q321 PC308 PC309
AUDIO
L1"
L2"
TEL LINE DRIVE/RECEIVE
DTMF OSC
CROSS POINT SW
D303 IC315 Q305
TEL
LINE
AF I/O
BUSY 2
CK DATA LE2
FSK
AF SELECT
SIREN
AF MUTE
BEEP/ALERT
FOG 2.13kHz
RF I/O
ROM
RXD
TXD
RING DET
PA MUTE
BUSY 2
BUSY 1
SP SELECT
HS I/O
RESET
DATA
CK LE3
HOOK OFF
CPU
IC305
LINE SELECT
CK