Icom IC-7851 Servise Manual page 141

TX
RX
Q271
A LDTC114EE
ACC(1)
6
SQLSM SQL
SQLAS
7
1:RTTY +15V SW
6 7
2:GND 1 RTTY
3:SEND 8 ALC
4:MOD 3 SEND
1 8 3
5:AF 4 MOD
6:SQLS 2 GND
7:13.8V 5 AF/IF12k
4 5
8:ALC
2
Q261
A L2SC4081
ACC(2) 6
TRV
7
+15V RTTY
RTKI
6 7 1
1:8V +8V KEY
2:GND
3:SEND 3 SEND Q266
1 3
L2SC4081
4:BAND 4 BAND
5:ALC 2 GND
6:TRV 5 ALC TRV
4 5
TRVI
7:13.8V CTRL
2
Q272
LDTC114EE
B
6
ACC(1) SQLSM SQL
7
+15V SW
6 7
1:RTTY 1 RTTY
2:GND 8 ALC
3:SEND 3 SEND
1 8 3
4:MOD 4 MOD
5:AF 2 GND
6:SQLS 5 AF/IF12k
4 5
7:13.8V
2
8:ALC
6
B TRV
7 Q251/Q252/Q253
ACC(2) +15V
DSC7004SO/LDTA114EE/L2SC4081
6 7 1
+8V
1:8V
TRAS
2:GND 3 SEND SEND
1 3
3:SEND 4 BAND CTRL
SENI
4:BAND 2 GND
5:ALC 5 ALC
4 5
6:TRV
2
IC281
7:13.8V
NJM4558
BNDAV
AMP
BNDBV
RELAY
Q37
ALC
LDTC114EE
SW SW
SW SW
CTRL CTRL
IC37
Q36
CONNECT UNIT LDTC114EE PS7122AL
EXRL1S EXRL2S
+15V
CHASSIS
Q421
Q422
IC441
2SD1801
LDTC114EE NJM4580
UNIT fc=8.8kHz G=-15dB
RIPPLE
SW
ASPON
FIL
CTRL
INT SP
LPF
IC421
LA4425
PWR
SW
AMP
SP OUT A
LPF
SPK
SP OUT B
IC431
LA4425
PWR
SW
AMP
Q431
Q432
2SD1801
LDTC114EE
RIPPLE
SW
BSPON FIL
CTRL IC471
NJM4580
Q411
LDTC114EE
+15V
AMP
AFO
SW
(MIC AF)
IC461
TPA6130A2
AMP
MAFS
Q501 AF
PHI(To the FRONT CPU)
LDTC114EE
AMP
MPHONE IC472
NJM4580
AF
SPHONE MUTE
AMP
AF
AMP
PHONES PHON
FRONT
AMP
UNIT
AMODIN_A
AMODIN_B
Q995
L2SA1576AR
PFORL
ALC ALC
MODAV
AMP
AMP MODBV
POCV
Q976-Q977
LDTC144EEx2
HFS/TXB11
AMODIN_A POWSET
ACC_AFA MICI
SWR PREFL
PDIDL
UMOD
DCAMP DIDL
IC951
UMODGV
NJM2058
MIGV
Q993/Q994
LDTC114EEx2
L2SC4081
SCHEMATIC
ALC
UNSBS
RIPPLE
DIAGRAM
CTRL
FILTER
u
Q951/Q952/Q971/Q972/D951
2SK3018/LDTA114EE/KTC2875/
SQLBS IC641
LDTA114EE/DZ2J047M
NJM4580
ALC
TAMS
CTRL
USB_AF_R
AMODIN_B
IC931
ACC_AFB
NJM2058
DCAMP ALCL USB_AF_L
DCAMP FIDL
PFIDL
ALC APC
ICCV
PVDL
DCAMP
VDL
IC661 IC701
NJM4580 NJM4580
ACC_AFA
AMP
(To the ACC SOCKET)
ACC_AFB
AMP
LPF
fc=10.8kHz G=0dB
fc=10.8kHz G=8.88dB
IC522
CD4053B
SW
LPF
SPMIXS
PMIXS fc=10.8kHz G=8.88dB
fc=10.8kHz G=0dB
IC521
NJM4580
fc=8.8kHz G=0dB
AMP
AMP
8-3
IC861
IC902
NJM2172
IC2331
CD4053B
NJM2114
IC2371
NJM2114
VCA SW
LPF
VOXAF
AMP
L-
AAMODS
IC902 IC2321
CD4053B NJM2114
VCA
IC911 IC2311
TS462 NJM2114 R+
SW TAFIN LPF
R-
AMP AMP
BAMODS
VOXAF
IC841 Q2381
IC901
NJM2172 L2SC4081
CD4053B
MCLK24M
AMP
VCA SW
UMODS
IC901
CD4053B
VCA
SW
IC2501
Q832 Q831 MICS
NJM2871
DMG564010
+5
+8V
+11V
SW
REG
IC2421 IC2411
NJM2114 PCM1754
MIC8VS
DAOUT_USB
L
LPF D/A
IC2421
NJM2114
AMP R
RAAGCV
(To the RF-A UNIT) LPF
Q2261
L2SC4081
IC2071
IC2081/IC2091
AMP
AMP IC2101 PCM1795
NJM5534x2
NJM5534
R+
DAOUT_AF
LPF D/A
BUFF
R-
IC2111 IC2251
IC2121
NJM2114
NJM2871
NJM2114
L+
DAOUT_ACC
+5
+8V
BUFF LPF
REG
L-
IC181 IC186
X181 SN74AUP1T17 SN74LVC3G34
CR-939
CLK24M
LEVEL
CLK24M_A
BUFF
CONV
CLK24M_B
24.576MHz
MCLK24M
AMP
IC201
SN74LVC2G74
CLK12M DRESD
DIV
CLK24M_A
AMP
IC581
CLK24M_B
NJM4580
DSP UNIT
LPF
IC2191
IC2221 IC2201/IC2211
PCM1795
NJM5534 NJM5534x2
R+
DBOUT_AF
IC601
LPF D/A
BUFF
NJM4580
R-
IC2231
IC2241
LPF
NJM2114
NJM2114
L+ +5
DBOUT_ACC
REG
BUFF LPF
L-
IC2451 IC2441
NJM2114 PCM1754
DBOUT_USB
L
LPF D/A
R
IC2451
NJM2114
RBAGCV
LPF
IC2502
(To the RF-B UNIT)
NJM2871
+5
REG
MAIN UNIT
IC2301
L+
AK4621
IC2341/IC2351
IC2361
NJM5534x2
NJM5534
R+
A/D D/A LPF BUFF
R-
Q2511
L2SC4081
MCLK24M
AMP
MCLK24M IC2041/IC2051
IC2001
PCM4222 NJM5534x2 IC2021/Q2021
IC2031
TC7W53/LDTC114EE
CLK12M R+ NJM5534
A/D LPF
R-
AMP
SW
L+ L-
IC2061
IC2002 NJM4580
NJM2871BF04
RAIFMS
RAAGC_DET
AMP
+4
(FROM RX-A UNIT)
REG
+5V
IC351
EN25Q40A
FLASH
MEMORY
IC301
IC151
ADSP-21489
ADP2370
DSP
1.1V A DC-DC 3.3V
IC451
EN25Q40A
IC171
ADP2370
FLASH LOGIC
MEMORY UNIT
1.1V B DC-DC
DSP
IC401
ADSP-21489
Q2271
L2SC4081
MCLK24M
AMP
IC2252
NJM2871 IC2131 IC2161/IC2171
PCM4222 NJM5534x2
IC2022/Q2022-Q2023
+8V CLK12M R+ TC7W53/LDTC114EEx2
IC2151
A/D LPF
R- NJM5534
SW
AMP
IC2132
NJM2871
RBIFMS
IC2181
+4 NJM4580
REG L-
AMP RBAGC_DET (From the RX-B UNIT)
L+
Q2541 +5V
L2SC4081
IC11
NJM7808
MCLK24M
AMP
+8
+8V +11V
REG
+8V
IC16
NJM7805
+5
+5V REG8V
REG
SWITCH
SIGNAL
IC22/Q24
AN79L08/DSC7004S0
-8
-8V -12V
REG
SWITCH
SIGNAL
TXIF
(RF-A RXIF)
RAIF
SCHEMATIC
DIAGRAM
r
TXIF
(RF-B RXIF)
RBIF
MON
T8V
Q781
L2SC4081
DC
IC781 +8V
CTRL
R2A20169
D/A
CONTROL
MDAT/MCK/ASTB1
SIGNAL
IC782
R2A20169
CONTROL
D/A
MDAT/MCK/ASTB2
SIGNAL
IC723/IC724/IC754 IC721/IC722/IC751
SN74AHC595x3
62783Gx3
S/P
BUFF
CONV MDAT/MCK/MSTB1/MSTB2/DRESH
IC752
SN74AHC595
S/P
CONV