Icom IC-7400 Service Manual page 82

• BLOCK (2)
Q241
3SK131
D261
HSB88WS
IF
1 LPF
AMP
FI231B
FL315
AGC
XTAL
BPF
ATT
2
D272
1SV271
ATT
3 DRIV
LPF
D271
HSB88WS
LPF
4
Q301
2SC4673
LO
LPF
AMP
LPF
Q302 DTA114EE
Q303 DTC114EE
SW
64.485-238.455MHz
LPF HPF ATT
LPF
LPF
Q1521
UMD3N
SW
IC1001
BU4094BCFV
LOF4
Q1581
UMD3N LOF3
SERI-
LOF2
PARA
SW LOF1
Q1561
UMD3N
SW
PST5
BPF BPF
Q1902
X1901
2SC4081 Q1901 2SC4403
CR-337A
D1901 MA357
(32.0MHz)
CLK
D/A x2 BUFF
Q1903 2SC4081
Q1904 2SC4403
IC1601 Q1601
5V CAL
SC-1287 2SC4081
14V
DDS AMP X1902
CR-338
OPTION
LDRS
PST3
Q1003
UMD3N
LEVEL
UNLC
CONV
Q231 Q211/Q212
2SK2171 2SK1740
IF
LPF
AMP
FI231A
FL-315
PRE1
XTAL
BPF
ATT
Q271
2SK882
IF
PRE2
AMP
ALC
POFF
1LO
B9S
D502-D504 Q502
1SV217 3SK177
PRE
BPF
Q1401 D1401/D1403 1SS315
AMP
2SC4226 L1402 LR-317
AMP x2
TNV2 PR3S
TNV1
V3S
Q1402
DTA114EE
SW
Q1281 IC1802
µPC1678G
Q1201 2SK508 2SC4405
D1201 MA338
Q1202
BUFF ATT AMP
2SC4213
V1S
SW
Q1221 2SK508
D1221 MA338
Q1222
2SC4213
V2S
SW
Q1241 2SK508
D1241 KV1470
Q1242 IC1801
2SC4213 MC145170
Q1302
V3S 2SC4081
SW
Q1261 2SK508
D1261 KV1470
PLL BUFF
Q1262
2SC4213
V4S
SW
Q1051
2SC4081
4V VCO RIPPLE
FIL
LOOP
FIL
IC1051
TA78L05F
+5
8V 5V PLL
REG
PST2
FAN CONTROL VOLTAGE
Q181/Q182
2SK2171
0.03-
1.6MHz
ATT
PRE
LPF B0
AMP
1.6-
2.0MHz
HPF
LPF B1
IC191 2.0-
µPC1658G
4.0MHz
BPF B2
ATT
PRE
AMP
4.0-
8.0MHz
BPF B3
8.0-
11.0MHz
IC323
BPF B4 TD62783AF
CURRENT B0S
11.0-
DRIVER B1S
15.0MHz
B2S
BPF B5
B3S
B4S
15.0-
B5S
22.0MHz
B6S
BPF B6
B7S
IC324
22.0-
TD62783AF
30.0MHz B8S
BPF B7 B8WS
CURRENT
DRIVER
ATTS
50.0- Q322-Q325/Q328
54.0MHz DTC114EE
D321-D324
BPF B8
DAN222
PREAMP
30-50MHz
/BPF
54-60MHz
SELECT
BPF B8W
RTXS
IC161
TA4001F
PRE1
YGR 144MHz PRE2
BPF
AMP
POFF
ATTC
B9T
B9R
D501
1SV217
108-174MHz
BPF ATT HPF
ATTC IC1081
TC7S08F
MKR MARKER
SW
BPF
LPF
Q1801
UMD3N
SW
Q1301 2SK210
D1301 MA357
LOOP
FIL
Q1102
2SC4081
IC1101
SC-1246A
AMP
PAFS
DBLS
Q1101 PHASE
MKRS
2SC4081 DET
DIVOUT
FANH
AMP
FANM
FANL
FI1101
CON2
CFECA10.8MD11
LDRS
PST1
CERAMIC
D/A DDS
BPF PDAT
PCK
Q1103
2SC4081
FAN Q2002-Q2004
DTC114EE
AMP SW
RF UNIT
ANT2 ANT1
HRX
ATT
RL3
RL1
ATTC
IC151 D15 HSM88AS
CURRENT
µPC1678G
D23 HSM88AS
DET
IC9 NJM203M
YGR
ATT
AMP
RL2
IC321
BU4094BCFV RL1
Q14/Q16
SERI-
DTC114EU
PARA
TUNER
CTRL
RMDT
RBST
Q12
DTC114EU
RMCK
T/R
RL4
CTRL
IC322
BU4094BCFV
Q23 DTC114EU
Q24 DTA114EU
SERI-
LPF
PARA
CT8V CTRL
PR3S
B9S
IC4
NJM4558M
D8/D9
RESIST
HSM88AS
AMP
Q5 DET
2SK515
IC4
NJM4558M
D4 DWA010
D5 HSM88ASR
PHASE
IC2 TC74ACT32F
AMP
DET
IC3 TC74AC112F
IC14 TC74AC04F
IC1
NJM4558M
SWR
D1/D2
AMP
HSM88AS DET
VRX
FOR
REF 14V
YGR
RL601
Q2 Q1
VPAO
2SC1971 2SK2973
PRE PRE
Q201/Q202
DRIVE DRIVE
2SC2694
144MHz
PWR
AMP
Q1/Q2
2SK2975
RL2
MA30PXB
DRIVE
Q203
AMP
BIAS
2SD1585
VAR-C&D
DRV
BOARD
Q5/Q6
BOARD
2SC2694
HF/50MHz
PWR
AMP
MA30PXB
Q7
BIAS
2SD1585
VAR-A&B
ICH BOARD
ICL
HV
IC1 F1
TA78L05F (FGB 5A)
+5
H5V
REG
RL1
14V
IC2 Q9
TA7805S DAP222
+5 RELAY
5V
REG CTRL
IC3
TA7808S
PWRS
+8
8V
REG
P1
3 6
H14V
COMMON
GND GND
FILTER
2 5
P14V
1 4
CHASSIS UNIT FILTER UNIT
10 - 2
COMMON LINE
LINE
RX LINE
TX LINE
CANT
DATA BUS LINE
TUNER BOARD
TUNING
NET.
THRU
TRC
IC5
M38022M2
CIST
AN2 CPU
AN3 CIKY
AN0/AN1
IC6
X1
X24C04S8
CR-569
(6.144MHz)
EEPROM
IC13
TA7805F
+5
5V
REG
CTRL UNIT
D602/D603 144MHz ANT
HSU88
SWR
LPF
DET
VREF
VFOR
THML
1.9MHz
LPF
L1
3.5MHz
LPF
L2
7MHz
LPF
L3
10/14MHz
LPF
L4
18/21MHz
LPF
L5
24/28MHz
LPF
L6
50MHz
LPF
L7
L8
IC502 IC501
BU4094BCF TD62783AF
SERI- CURRENT
PARA DRIVER
FSTB 14VS
MDAT
MCK
PA UNIT