Icom IC-7400 Service Manual page 79

• CTRL UNIT
J1
C1 2p
from
CTIN
PA unit R5
220k
J502
C3 20p
C2 47p
D1
HSM88AS
R3 10k
R1 18
D2
HSM88AS R4
10k
R6
220k
C5
C4 2p 56p
C14 33p
C12 3p C13 33p
R136 10k
R15 100
5 6
2 1
D4
IC14c
DWA010
TC74AC04F
3 4
C17 R17
R139
82p 100 10k
11 10
D5 IC14e
HSM88ASR TC74AC04F
C32
2p TX: 4.4V
RX: 0V
D8
HSM88AS
D9
HSM88AS
Q12
TX: 0V
DTC114EU RX: 13.8V
RL4
AE5343
D16
DA221
J2 L35 L28 L27
P2 EP2
LA-248 LA-247 LA-254
to
HRX
RF unit
J1
C116 12p C105 33p C64 82p
RL2
ANT1 FTR-F1
W11
R159 4.7k
to
CHASSIS R152 4.7k
D22
ANT2
MMBV3700LT1
W12
D21
MMBV3700LT1
Q25 TX: 0V
R153
2SC4213 RX: 13.8V
4.7k
R154
1k C203
0.0047
TX: 13.8V
RX: 0V
R9 1M
CP1
IC1b
NJM4558M
R13
5 1k
AN1
7
+
6
-
IC3b
TC74AC112F
R10
14
820k
CLR
12 7
K Q
13
CK
IC1a
NJM4558M 11 9
8 J Q
3
AN0
+ 1
PR
2
- 2 1
R14
D3 10
4
1k
1SS319
IC3a
TC74AC112F
15 16
3 4
CLR VCC
2 6
K Q
1
CK
3 5
Q
J
GND PR
8 4
IC2b
R137
TC74ACT32F
47
4
6
5
R142
IC2c
47
IC2d TC74ACT32F
TC74ACT32F
12 9
11 8 R34
13 10
5.6k
R146
47 IC4b
R33
IC2a NJM4558M
R140
TC74ACT32F 5.6k
14 5
47
1
3
6
2
R32
R144
7 47 100k R36 1.5M
TX: 0.156V
RX: 0.164V
IC14a IC14b
14
TC74AC04F
TC74AC04F
1 2 3 4
0.14V
7
IC14d
IC14f R51 6.8k
TC74AC04F TC74AC04F
TX: 50mV
Q5
RX: 0V
IC4a
2SK515 8
13 12 9
NJM4558M
R50
6.8k
3
R47 1k
2
R49
100k
TX: 1.5mV
RX: 0V
R53
1.5M
TRC
TX: 0.14V
RX: 0.13V
D17
RL1
DA221
FTR-F1
1.25mV
Q14
TX: 13.8V DTC114EU
RX: 0.28V
D23
HSM88AS
C214
C211
0.001
1p
IC9a
NJM2903M
C213
C212
22p
12p R158 R157 TX: 54mV
10K 10K RX: 0V
D15
L22 HSM88AS
R84 R86
LR-364
10k 220k
TUNER on: 13.8V
off: 0.28V
D18
DA221
Q16 D20
DTC114EU DA221
12 - 9
FOR
REF
5VA
Q211
L2
DTC114EU
10µH
P00
Q212
DTC114EU
P01
5VA Q213
DTC114EU
L5
P02
10µH
Q214
R28 DTC114EU
3.3k
P03
R26 C24 Q215
DTC114EU
47 220p
P04
D6
HSM88AS Q216
DTC114EU
P05
Q217
DTC114EU
P06
D7
HSM88AS Q218
DTC114EU
P07
R27 C25
47 220p
MEASUREMENT CONDITIONS R30
frequency: 14.1MHz USB 220
RX(RF: no input)
TX(AF: no input)
Oscilloscope(20MHz,1MW) 14V
Digital tester
Range Input resister
200mV 100MW
2V 11MW
Voltage at RX(No designation)
20V 10MW
R35 L10 100µH
82k
TX: 2.6V
C46 0.1
RX: 2.52V
0.162V
R37 R38
IC6
10k 10k
7 AN3
+ HN58X2416FPI
-
1
A0
2
A1
3
A2
4
VSS
R52
L11 100µH
100k
TX: 2V
RX: 2.15V
R54 R55
8 10k 10k
1 AN2
+
-
1 2
4 D10
DWA010
4 3
5VA
R90 220k
R89 2.2M IC9b L25 100µH
NJM2903M
5
7
+
6
-
38mV
4
2
- 1
3
+
R92 RL3
8 1k FTR-F1
5
4 2
3
IC10
TC4S69F
C62
0.004V
REF
0.0047
13.2V
Q21
DTC114EU 4.44V
FOR
-8V -7.6V
4.82V
5VA
13.4V
14V
NOTICE: Refer to the PARTS LIST for the value and name of each component.
L13
100mH
13.6V
13.6V
13.6V
13.6V
13.6V
13.6V
4M R121 1k
7M R120 1k
13.6V
10M R119 1k
14M R118 1k
18M R117 1k
13.6V
24M R116 1k
VHF
R115 1k
CO3 R108 1k
CO2 R109 1k
CO1 R110 1k
NVHF R111 1k
CI3 R112 1k
CI2 R113 1k
CI1
R114 1k
8
VCC
7
TEST
6
SCL
5 49 32 4M
SDA P20/DB0
P37/RD
7M
50 31
P36/WR P21/DB1
51 30 10M
P22/DB2
P35/SYNC
52 29 14M
P34 P23/DB3
53 28 18M
P24/DB4
P33/RESET OUT
54 27 24M
P32/ONW P25/DB5
VHF
55 26
P31/DA2 P26/DB6
56 25 NVHF
P27/DB7
P30/DA1 IC5
TRC
57 24
VCC M38022M2-138FP VSS
58 23
XOUT
VREF
59 22
AV88 XIN
60 21
P40/INT4
P67/AN7
61 20
P66/AN6 P41/INT0
62 19
RESET
P65/AN5
63 18
P64/AN4 CNV66
THRU
64 17
P63/AN3 P42/INT1
W3
0.16msec
3.5V
R63
R62
100K 100K
R76 10k
R61 100k
CP7
SETI
R64 100k
W4
IC13
D13
TA7805F
4.92V
MA2J1140G
O I
G
R105
4.7V
1k
R65
R102
1k
12k
D11
RD5.1M
R98 1k
R99 1k
L31
HF50ACC322513-B
L29
HF50ACC322513-B
J10
T14V
PW
to TUNER
PX
unit MF1
PY
PZ
J11
T14V
AW
to TUNER
AX
unit MF2
AY
AZ
J8
GND
GND
35M
7M
10M
14M
18M
24M
VHF
GND
to TUNER
GND
unit J5
14V
14V
CO3
CO2
CO1
NVHF
CI3
CI2
CI1
GND
GND
J3
TUIN from TUNER
unit J3
J4
from TUNER
TUOT
unit J4
0.16msec
4.4V
J13
P3
X1
CR-569
(6.144MHz)
CHASSIS
J14
P3 SP1
SSP
PAFE
CP2
TX: 4.98V
RX: 0V
Q24
DTA114EU
Q23
DTC114EU
J7
CIKY
CIST
GND
CANT
GND
CDRS
GND
CREF
CFOR
to
GND
MAIN
GND
unit
C-8V
J140
GND
C5V
C5V
SETI
GND
CT8V
GND
C14V
C14V
C14V
CTRL UNIT