Icom IC-F31GS, Servise Manual

Page: 31 / 36

10 - 1
SECTION 10 BLOCK DIAGRAM
IC2
TC75S51F
MIC
AMP
136-174 MHz
D2
MA713 Q1
2SK2974
D1, D24, D25
MA77 Q2
2SK2973
Q3
2SC4226
MAIN UNIT
MAIN UNIT
VCO
SW
VCOS
D4, D5: MA77
Q6
2SC4215
Q8
2SC4215
Q9 DTC144EU
Q10 XP1214
RX VCO
Q13
XP6501
Q11: 2SC4226
D6, D40–D42: HVC350B
Q12: 2SC4226
D8, D43–D45: HVC350B
S5V
LVIN
BUFF
Q14
2SK880
IC1
SA7025
X1
CR-667
IC2
TC75S51F
TCXO
MOD
NOIS
FRACTIONAL N 15.6 MHz
31.2 MHz
DSIN
Q15
2SC4116
SECOND MIXER
IF AMP
MOD
TX VCO
D7
1T365
TA31136FN (D)
IC3
IF
X2
CDBCA450CX24
Q7
2SC4215
Q18
2SC4215
FI1
FL-322
31.65 MHz
W/N
W/N
SW
Q17 2SC4116
Q16 DTA144EU
Q19
3SK206
D19
HVC375B
D18
HVC375B
RSSI
Q21
2SK1829
D20
HVC375B
PWR
DET
T4
IC4
TC75S51F
D21
HVC375B
MUTE
SW
TMUT
Q22
DTA144EU
UNIVERSAL
CONNECTOR
CONNECTOR
J4
T1
IN/EXT
MIC SW
XTXD, XRXD, RES
VCC
IC19
BU4053BCFV
DETECT
PTT
MIC
AFOUT
T2
AFON
AFMT
SW
MICI
Q20
3SK293
PTT/MD1
IC13
DA3
IC19
BU4053BCFV
T4 T3
AF AMP
REG
VCC
W/N
SW
MIXER
Q23 2SB1132 R
Q24 XP6501
Q26
DTC144EU
W/N FSW
IC7C
NJM2902V
FIL
SW
FI2
Q27
2SC4212
SFPC450E
W/N W/N
SW SW
DETECTOR
SQL AMP
W/N
D15
DAN202U
D16
DAN202U
FI3
RSSI
SFPC450G
FRCN
IC13
M62364FP
SPLO
MOD
A
D/A
T1
T2
T3
T4
IC10
NJM2902V
COMPRE-
MSK
MOD MSK
DEMOD
B
EXPAN-
DER
COMPANDER
IC5
TA7368F
NJM2902V
IC9 TC35453F
IC13
DA1
SIG1, SIG2,
CTCS, TONE
VOX
PTIN
PTOT
CR-681
IC18
IC7B
G
12.288 MHz
SHIFT
SP
SW
SP+
SP–
MIC+
D27
MA77
X3
SPCN
Q6, Q7
CPH3403
Q8
2SC4081
INT MIC
INT SP
PTT
EM-140
MC1
F0
LCD MODULE
SW
IC1
TC74VHC373FT
RDB WRB RESB
D0-D7 RS
Q9
DTC144EU
CPU
BATT
POWER SW
FUSE
VOXT
TA75S01F
F1
IC13
DA2
IC15
BEP1 BEP2
TONE
VCC
BEEP
SSOR
MCIN
X4
Q47
2SC4081
MCOT
CR-563
3.58 MHz
REM
MSKE
TRD
DIN
REGS1
REGS2
RTM
RDT
FCLR
D/A
IC27
M62334
SCL
SDA
SCK
APST
OPTION
DTMF
UNIT
BEP1
SIG1
DTSD
DTAC
DDST
CIRQ
SI
LC73872M
OSCI
IC17
DECODE
DTPD
D
SO
SCK
DAST
F
AFON
1
OPTION
2
UNIT
PTIN
PTOT
MCIN
MCIN
MCOT
MCOT
SIG2
BEP2
RMUT
MMUT
CCS
OPV11
OPV12
OPV13
OPV21
OPV22
OPV23
C
E
SO
SCK
OPT11
OPT12
OPT13
OPT21
OPT22
OPT23
FIL
SW
FIL
SW
DUSE
CTCS
J1
J2
Q41
DTC144EU
Q40 IC13
DA4
XP1214
IC7D
NJM2902V
CTCSS
DTCS
IC30
TC7S66FU
Q44
DTC144EU
CTDA
+5
CPU
+5
REG
R5
REG
+5V
R5V
Q32 2SB1132
Q33 XP6501
Q30 2SA1362
Q31 2SA1362
AN8005M
RESET
CPU5V
RES
IC12
SO
SCK
EXST
IC23 RESB
T5C R5C
BUSY
DTPD
DUSE
IC14
HD64F2238
S-80942ANMP
MSCK
MSO
CB10
CB11 LED SW
MATRIX
KEY
EXPAND
D0-D7
KS0-3
KR0-3
FRST
KEY
LED
SW
VCC
2SC4116BL
BUSY
F1
F2
F3
Q1, Q2
DS1-4
DS6-9
DS11-12
DS14-15
LN1371G-(TR)
VCC
FRONT UNIT
TX LED
DS5
LN210C6ARA
BUSY LED
TX
DS13
LMJ310M6RA
VCC
CH
SELECT
CB12
CB13
S1
EC10SP16-47
Q3 DTC144TE
LED SW
Q4 DTC144TE
EEPROM
IC16
EXP-
ANDER
W/N
FSW
EEPROM
IC24
HN58X2464TI HN58X2464TI
S5C
AFMT
SPCN
BU4094BCFV
S5
REG
T5
REG
S5V
T5V
Q29 2SA1362
RXDT
DATA
LPF
IC31
SDEC
TC75S51F
RESTO-
RATION
DATA
LPF
NJM2904V
IC20B
IC20A
NJM2904V
SW
PTIN
PTOT
Explanatory notes
COMMON LINE
TX LINE
RX LINE
CONTROL LINE
SQIN DSIN
CSFT
DRIVE
AMP
PLL IC
×
2
LPF
BPF
LOOP
FILTER
RIPPLE
FILTER
BUFF
BUFF BUFF
TX/RX
SW
AMP
XTAL
BPF
YGR
AMP
ATT
BPF BPF BPF
GATE
CTRL
RF
AMP
PRE
DRIVE
PWR
AMP
APC
AMP
BPF
ANT
SW
LPF
AF
AMP
AMP
LPF
LPF
AMP
LIMIT
AMP
AMP
HPF
LPF
AMP
BUFF
HPF LPF AMP
BPF HPF
HPF
AMP
CERAMIC
BPF
CERAMIC
BPF
LPF
MIC