Block Diagram - Icom IC-7400 Service Manual

SECTION 10

BLOCK DIAGRAM

• BLOCK (1)
IC501
AK4528VF
IC1
TC7WHU04FU
X1
CR-628
(24.576MHz)
A/D
BUFF
Lch
D/A
Lch
IC801
SN74AHC244PW
SERIAL DATA (Ext) SERIAL DATA A/D
SER-
Rch
DATA
SW
D/A
Rch
IC102
BU9480F
D/A
Rch
IC3A
SN74AHC74PW
BICK
1/2
D/A
Lch
IC4B
SN74AHC74PW
IC51
TC7WHU04FU
LRCK
X51
1/2
CR-709
(60.0MHz)
BUFF
IC4A
SN74AHC74PW
IC301
CS
TMS320VC33PGE120
Q301
1/2
DTC144EU
KEYIN
LEVEL
CONV
Q302
DSP
DTC144EU
IC101
SN74HCT244APW
UNLK LEVEL
DXO
CONV
LEVEL
CONV
OBS,IBS
IC406
SN74AHC74PW
RQO
LATCH RQI
IC201
M29W102BB
FLASH
ROM
IC401
SN74AHC595PW
SERI-
PARA &
LATCH
IC403 IC404 IC405
SN74AHCT374PW SN74AHCT374PW BU4021BF
OUT1-8
PARA-
LATCH LATCH
SERI
COMMON LINE
LINE
RX LINE
TX LINE
DATA BUS LINE
DRIF
IC651
BA15532F
DTIF
DSPI1
DIFF
IC1401
CONV NJM2058M
DAGC AGC
AGC
AMP
IC701A
µPC4570G2
MONI
DSPO1 DRAF
LPF
DTAF
IC601
BA15532F
Q1260
DIFF DSPI2 2SD1801
CONV
RIPPLE
14VA
FILTER
IC701B
µPC4570G2
IC1220
DSPO2 TC4W53
LPF
PWR
AMP
IC1240
LA4425A AFMS
AGC1
BUFF
IC1280
NJM4558M
ANTI
VOX
AGC2
BUFF
OBSY, IBSY
UNLK
HSEND
KEYIN
VSEND
RQO
SEND
RQI
DI
CK
DO
STBO
DRES
EXT-SP
JACK
CHASSIS UNIT
SP1
PHONE BOARD
J1
J2
DASH
DOT
MIC BOARD
J1
MIC
MSEND
MIC
SQLS
DI
JACK
CK MUD
PBT BOARD
S2
PBT1 PBT2
DO
STBO
DRES
S1
M-CH
RIT BOARD
S1
RIT DIAL
EP1
MAIN DIAL
DSP UNIT FRONT UNIT
10 - 1
IC1460 IC1460
BA15532F BA15532F IC280
TC4W53F
IF
LPF
AMP
IC1120 IC1120
µPC4574G2 µPC4574G2
AMP LPF
IC1060
NJM4558M
AF
AMP
AFG2V MONV
AFG1V
IC1080
AAFO M5282FP
IC1180
M5282FP
DOUT
SQLS
VCA
AF
VCA
AMP
BEEP IC1160
TC4W53F
MIGV
IC1400
ACCMOD
M5282FP
IC1401 IC1401 IC1401
NJM2058M NJM2058M NJM2058M
DATA
AF
VCA AMP LPF LPF
AMP
IC1280
NJM4558M
AVXL VOX VOXL
Q700
2SC4081
FKEY _RTKI DATA PTT LEVEL
RTKI DPTL
CONV
STRAIGHT KEY _SKYS
SKYS REFL
AH-4 EKEY
KEY ALCL
AH-4 TCON
START THML
Q780/Q722/Q724
2SC4081 VCCL
FORL
LEVEL ESTA
CTRL
CONV
P2MS
IC1900
IC1500
Q1880 BU4053BCFV
HD64F2357F20
DTC114EU
_SENI
SENI MULTI
SEND
_TRAS
CTRL TRAS
_SQLS MAIN CPU
SQL
Q782/Q785/Q786 _PWRK
PWRK
2SD1619
Q783/Q787/Q788
DTA114EE
X1500
CR-520
RESET EEPROM
(19.6608MHz)
IC1560 IC1580
S-80942ANMP HN58X24128FPI
FPWK
IC571
AF-SW
TC4S71F
DSHK
DOTK
MUDL
PB2A
PB2B
PB1A
POWER
PB1B
MDNK S601
MUPK
IC101 TRANSMIT CALL
MC14071BFEL
S1 TRAK S6
RSA
WAVE
FORMER TUNER LOCK/SPEECH
RSB
S2 TUNK S7
NOTCH
ANT
NOTL
S3 ANTK
R1
NR
NRL
NR
S4 NRK
RF
AFL
NOTCH
R4
AF
S5 NOTK
RFL
MIC GAIN
IC401 NJM2360
R7 MIGL
D402 SB10-05PCP
RF POWER
R9 PWRL -8V
14V
CW PITCH DC-DC
R11 PITL
KEY SPEED
R13 KYSL
IC101 MC14071BFEL IC101 MC14071BFEL
IC102 µPD4030BG IC102 µPD4030BG
WAVE MSA
x4
FORMER MSB
SUB-LOGIC BOARD
FI272 FI271 Q250
CFWM455D CFWM455D 3SK131
IF
BPF BPF
AMP
(20K BW) (20K BW)
IC1120 FI381
AGC
µPC4574G2
IC400 CFWM455D
MC1496V
LPF BPF
Q206 2SC4081
Q207 UN911H
IC281 TC4SU69F (20K BW) IC200 NJM2056M
IC282 TC4SU69F Q208 XP4311
2F15
LO
GATE CTRL
AMP
IC1001 D200 Q203 Q202
SBSY
NJM2904M 1SS375 2SC4081 2SK882
UT-102 NB NOISE NOISE
SSTB FMTL TONE FIL
DET AMP AMP
OPTION
Q204 Q205
MSL1 2SC4081 2SA1576
MSL2
AGC AGC
(MUTE)
AF
AMP AMP
AMP
3LO
IC1040
TC4W53F
IC1310
IC1300 IC1300 D1300 IC1300
BU4053BCF
NJM2058M NJM2058M 1SS385 NJM2058M
COMPA
AMP BUFF DET
RATER
Q303 2SA1576
Q305 DTC144TE
9K6S
MODS DELAY
UNSB
CTRL
IC200
NJM2058M
BAND AMP ALC
EALC
IC200 AMP
Q307
NJM2058M
2SA1576
-8V
TNV1 AMP
IC200 ICH ALC
NJM2058M
ICL AMP
IC300
TNV2 AMP
IC300
NJM2058M
PHFS NJM2058M
Q511
2SC4081 P50S
P2MS
LEVEL
DRIV AMS
CONV
POCV
PWR
CTRL IC360
D/A VFOR
NJM2058M
FOR
IC300
IC502 AFG1V NJM2058M
M62352GP
AFG2V IC300
CI-V
IC1940 TC7W04F NJM2058M
MONV
I/F
Q1940 2SA1576
IC360
Q1941 2SC4081 MIGV REF ALC
NJM2058M
AMP
POCV VREF
CIV
NBV
CIVE
DS1001 DLC-7997S2GT
DS1002
HMDS 3 A1W 70N/AZ ASSY
Q301 2SC4081
Q302 2SB1202
DC-AC
Q303 2SC3647
Q304 2SC3647
BKL
IC1006
SED1522FOC
X1001
CR-567
LCD
DRIVE
IC1001
HD6433833SD85H
SUB-CPU
P.AMP/ATT
KI0
CALK S8 IC1002
SSBK KI1 MULTI
BU4051BCF
CWRK
NB
AFMK
LOCK S9
FILK
VOX
S10
DISPLAY BOARD
MONI
S11
MENU SSB
SSBK
MNUK LOCD
F1 CW/RTTY
CWRK
F1K
SPLD
F2 AM/FM
AFMK
-8V F2K
FIND
F3 FILTER
FILK
F3K
F4
TXD
F4K
F5
RXD
F5K
MODE BOARD
D252 1SV308
D253 1SV308
NB GATE
1
Q330
2SK882
IF
AMP
ALC
2
NBS
NBV
Q201 Q200
2SK882 2SK882
NOISE NOISE
3
AMP AMP
4
D300/D301
MA8030
LEVEL
14V VCCL
CONV
OVDK
Q450 2SC4081
Q452 2SD1619
T8
T8V
REG
TXS
Q451 2SC4081
Q453 2SD1618
ALC
R8
R8V
REG
RXS
8V
AMP ALCL
Q801 2SB1201
Q802 2SC4116
D801 MA8068
FAN
14V
CTRL
AMP FORL
FANV
MF1
AMP REFL
MAIN UNIT CHASSIS UNIT
LCD
IC1007 IC1008 IC1009
HD61202UFS HD602UFS HD602UFS
LCD LCD LCD
DRIVE DRIVE DRIVE
7(3) F-INP V/M
18(6) SPLIT PBTC RIT
28(9) A/B M-CL DTX
144(ENT) TS MW CLEAR
XFC 1.8(1) 3.5(2)
DS3
LOCK
XFCK
LED
MPW 10(4) 14(5)
DS5
SPLIT MPWK
LED
MPR 21(7) 24(8)
MPRK
DS4
F-INP
LED GENE(.) 50(0)
DS1
TX
LED
DS2
RX
LED
TEN-KEY BOARD