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10 - 2
UNLC
3LO
2LO (64MHz)
RF UNIT
LPF
to MAIN unit(BLOCK )
1
LPF
LPF
LPF
D261
HSB88WS
D271
HSB88WS
Q302 DTA114EE
Q303 DTC114EE
64.485-238.455MHz
Q1401
2SC4226
Q1521
UMD3N
IC1001
BU4094BCFV
LOF4
V1S
LOF3
LOF2
LOF1
D1401/D1403 1SS315
L1402 LR-317
ATT
ATT
IF
AMP
Q241
3SK131
IF
AMP
Q231
2SK2171
Q211/Q212
2SK1740
MKR
IF
AMP
Q271
2SK882
LO
AMP
Q301
2SC4673
1LO
PRE
AMP
Q181/Q182
2SK2171
AGC
ALC
B9S
DRIV
XTAL
BPF
FI231B
FL315
D272
1SV271
XTAL
BPF
FI231A
FL-315
LPF
LPF
LPF
PRE1
PRE
AMP
PRE2
POFF
ATT
ATT
ATT
B0S
B1S
CURRENT
DRIVER
ATT
ANT2
RL3
HRX
ANT1
ATT
RL1
IC191
µ
PC1658G
LPF
LPF
SW
0.03-
1.6MHz
IC323
TD62783AF
CURRENT
DRIVER
IC324
TD62783AF
PREAMP
/BPF
SELECT
Q322-Q325/Q328
DTC114EE
D321-D324
DAN222
SERI-
PARA
IC321
BU4094BCFV
CURRENT
DET
TUNER
CTRL
TUNING
NET.
D15 HSM88AS
D23 HSM88AS
IC9 NJM203M
RL2
RL1
RL4
Q14/Q16
DTC114EU
T/R
CTRL
Q12
DTC114EU
RESIST
DET
PHASE
DET
D8/D9
HSM88AS
Q5
2SK515
D4 DWA010
D5 HSM88ASR
IC2 TC74ACT32F
IC3 TC74AC112F
IC14 TC74AC04F
D1/D2
HSM88AS
Q203
2SD1585
Q1
2SK2973
CTRL
CPU
Q23 DTC114EU
Q24 DTA114EU
AN2
AN3
AN0/AN1
EEPROM
BIAS
IC6
X24C04S8
THRU
TRC
SERI-
PARA
VRX
IC322
BU4094BCFV
B0
B1
1.6-
2.0MHz
B2
2.0-
4.0MHz
B3
B2S
B3S
B4S
B5S
B6S
B7S
B8S
B8WS
ATTS
4.0-
8.0MHz
BPF
BPF
B4
8.0-
11.0MHz
BPF
B5
11.0-
15.0MHz
BPF
B6
B8
15.0-
22.0MHz
BPF
B7
B8W
144MHz
B9T
B9R
108-174MHz
MKR
22.0-
30.0MHz
BPF
50.0-
54.0MHz
BPF
30-50MHz
54-60MHz
IC161
TA4001F
D501
1SV217
BPF
BPF
D502-D504
1SV217
BPF
BPF
YGR
AMP
ATTC
RMDT
RBST
RMCK
FOR
REF
ICH
ICL
HV
PR3S
B9S
ATTC
POFF
PRE2
PRE1
RTXS
YGR
AMP
HPF
ATT
MARKER
SW
IC1081
TC7S08F
ATTC
PRE
AMP
Q502
3SK177
PR3S
TNV2
TNV1
V3S
HPF
ATT
SW
SERI-
PARA
Q1581
UMD3N
SW
Q1202
2SC4213
Q1201 2SK508
D1201 MA338
SW
Q1402
DTA114EE
SW
Q1051
2SC4081
IC1051
TA78L05F
IC1801
MC145170
PD
A
T
PST2
PCK
ULP
Q1302
2SC4081
Q1102
2SC4081
Q1301 2SK210
D1301 MA357
Q2002-Q2004
DTC114EE
IC1101
SC-1246A
PAFS
DBLS
MKRS
DIVOUT
FANH
FANM
FANL
RIPPLE
FIL
LOOP
FIL
+5
REG
ATT
PLL
V2S
Q1222
2SC4213
SW
V3S
Q1242
2SC4213
SW
V4S
Q1262
2SC4213
SW
Q1561
UMD3N
SW
Q1003
UMD3N
LEVEL
CONV
x2
AMP
LPF
LPF
BPF
Q1221 2SK508
D1221 MA338
Q1241 2SK508
D1241 KV1470
Q1261 2SK508
D1261 KV1470
4V VCO
BUFF
Q1281
2SC4405
IC1802
µ
PC1678G
LPF
BUFF
LOOP
FIL
PHASE
DET
FAN
SW
AMP
AMP
Q1103
2SC4081
CLK
ULD
DULS
AMP
Q1101
2SC4081
FI1101
CFECA10.8MD11
AMP
DDS
D/A
CERAMIC
BPF
Q1801
UMD3N
SW
PCK
PDAT
PST1
LDRS
CON2
5V PLL
PST2
8V
5V CAL
PST5
14V
BPF
BPF
Q1903 2SC4081
Q1904 2SC4403
IC1601
SC-1287
FAN CONTROL VOLTAGE
PD
A
T
PCK
PD
A
T
PST5
PCK
x2
Q1902
2SC4081
CLK
BUFF
Q1901 2SC4403
D1901 MA357
X1901
CR-337A
(32.0MHz)
X1902
CR-338
OPTION
D/A
DDS
Q1601
2SC4081
AMP
LDRS
PST3
UNLC
CANT
TUNER BOARD
CTRL UNIT
PA UNIT
CHASSIS UNIT
FILTER UNIT
DRV
BOARD
VAR-C&D
BOARD
X1
CR-569
(6.144MHz)
IC5
M38022M2
IC4
NJM4558M
AMP
IC4
NJM4558M
AMP
SWR
DET
IC1
NJM4558M
AMP
CTIN
IC13
TA7805F
+5
REG
D602/D603
HSU88
SWR
DET
5V
CIKY
14V
VREF
VFOR
THML
CT8V
LPF
CIST
PRE
DRIVE
Q2
2SC1971
PRE
DRIVE
Q1/Q2
2SK2975
RL2
YGR
DRIVE
AMP
PWR
AMP
Q201/Q202
2SC2694
144MHz
L1
MA30PXB
VPAO
HF/50MHz
1.9MHz
RL601
LPF
LPF
RL1
144MHz ANT
Q7
2SD1585
F1
(FGB 5A)
BIAS
VAR-A&B
BOARD
PWR
AMP
Q5/Q6
2SC2694
MA30PXB
PWRS
L2
3.5MHz
LPF
L3
7MHz
LPF
L4
10/14MHz
LPF
L5
18/21MHz
LPF
L6
24/28MHz
LPF
L7
50MHz
LPF
L8
CURRENT
DRIVER
IC501
TD62783AF
IC502
BU4094BCF
SERI-
PARA
14VS
FSTB
MDAT
MCK
H5V
14V
IC1
TA78L05F
+5
REG
5V
IC2
TA7805S
+5
REG
8V
IC3
TA7808S
+8
REG
P1
GND
P14V
H14V
GND
Q9
DAP222
RELAY
CTRL
COMMON
FILTER
3
6
2
5
1
4
HPF
IC151
µ
PC1678G
(1)
2
3
4
COMMON LINE
LINE
RX LINE
TX LINE
DATA BUS LINE
• BLOCK (2)
Summary of Contents for IC-7400
Page 1: ...HF VHF TRANSCEIVER i7400 SERVICE MANUAL ...
Page 63: ...to S LOGIC board J303 DS1002 9 2 DISPLAY BOARD TOP VIEW 9 3 for free by RadioAmateur eu ...
Page 72: ...9 12 1 9 18 10 BOTTOM VIEW RF UNIT for free by RadioAmateur eu ...
Page 74: ... BOTTOM VIEW CTRL UNIT 9 14 for free by RadioAmateur eu ...
Page 76: ... BOTTOM VIEW TUNER UNIT 9 16 for free by RadioAmateur eu ...
Page 78: ...9 18 BOTTOM VIEW PA UNIT for free by RadioAmateur eu ...
Page 92: ...1 1 32 Kamiminami Hirano ku Osaka 547 0003 Japan S 13811HZ C2 2002 Icom Inc ...