Icom IC-7400, Service Manual, Page: 87 / 92

12 - 4
5V
2SC4081
Q810
RTKI
0.0047 C788
4.7k R814
4.7k R811
MA2S111 D810
15k R813
33k
R812
0.0047 C810
C1620 100p C1621 100p C1622 100p C1623 100p C1624 100p
R1620 47k R1621 47k R1622 47k R1623 47k
[ACC (1)]
[ACC (2)]
[ALC]
[SEND]
unit J13
to CTRL
[EXT SP]
PAFE
SSP
PAFE
SSP
_SSTB _SBSY
SPCH
GND
SPCE
5VL
MCK_UT
SBSY
SSTB
MDAT_UT
[REMOTE]
J1
to CHASSIS
GND
GND
EGND
E14V
EST
EKY
[DATA]
CP9011
CP9009
CP9002
CRSY
CTXD
CRXD
_H5VL
_NSQL
TFRA RXF2 RXF1 RXF0 TXF3 TXF2 TXF1 TXF0 RXSO TXSO DLTX
_DRES
100k R1912 100k R1913
W304
5VL
CP1000
MAIN UNIT (2)
(1)
UNIT
MAIN
_H5VL
5VL
5V
14V
8V
W1940
FZMD
_H5VL
FZVP
FZRS
FZTX
FZRX
CP1624 CP1623 CP1622 CP1621 CP1620 CP1626
_H5VL
5VL
100k R2040
0.1 C2040
FZMD
0.01 C1580
0.1 C1504
CP1581
CP1583 CP1582
22k R1910 22k R1900
_ASO2
ACCMOD
AAFO
EALC
SQL
14V
BAND
10k R786
0.0047 C784
680 R791 680 R785
2SD1619
Q785
0.0047 C796
10k R797
680 R793 680 R792
DTC114EU
Q787
2SD1619
Q786
0.0047 C795
680 R795 680 R794
10k R796
DTC114EU
Q788
P2MS
DTA114EE
Q783
5V
8V
14V
TRAS
D782 MA2S111 R787 2.2k
D783 MA2S111 R788 2.2k
0.0047 C785
0.0047 C792
0.0047 C786
10k R789
0.0047 C787 0.0047 C791 0.0047 C790
0.0047 C789
L786 100
µ
L787 100
µ
100
µ
L788
HF50ACC322513-B
L789
HF50ACC322513-B
L785
100
µ
L784
100
µ
L781
100
µ
L783
HF50ACC322513-B
L790
HF50ACC322513-B
L782
HF50ACC322513-B
L780 L793
RXS
144M SEND
HF & 50M SEND
5V
CP790 CP791 CP792 CP793 CP794 CP795 CP796
CP782 CP783 CP784 CP785 CP789 CP787
CP797
CP786
8
6
1
4
2
5
3
7
6
1
4
2
5
3
7
DTC114EU
Q784
0.0056 C794
DAN222 D784
10
R790
0.0047 C793
OMR-109F
RL781
J782
CP788 CP781 CP780
J781
J780
0.0047 C760 0.0047 C761 0.0047 C762
CIVE
CIV
START
14V
KEY
L763 HF70ACC635050-T
L762 HF70ACC635050-T
L761 220
µ
L760 220
µ
W760
100p C763
CP760 CP761
CP762 CP763 CP764 CP765
J760
J761
0.0047 C702 0.0047 C703
0.0047 C704 0.0047 C705 0.0047 C706
DPTL
10
µ
L2060
0.0047 C701
R702 4.7k
MA2S111
D700
0.0047 C700
2SC4081
Q700
15k R700
4.7k
R703
33k R701
AAFO
DATA
DOUT
SQL L700 100
µ
L701 100
µ
L702 100
µ
EXCCL3225U
L703
L704 100
µ
CP704 CP702 CP700 CP703 CP705 CP701
J700
5
3
1 2
4
6
W740
SPS
14V
14V
PAFO
DTC114EU
Q740
0.0047 C741
DAN222 D740
10
R740
0.0047 C740
AHY103
RL740
PAFE
CP740
L741
HF50ACC322513-B
HF50ACC322513-B
HF50ACC322513-B
L792
HF50ACC322513-B
L794
HF50ACC322513-B
L791
HF50ACC322513-B
HF50ACC322513-B
HF50ACC322513-B
L742
L740
L795
HF50ACC322513-B
L796
CP742
CP743
CP741
J740
J741
CP1921 CP1923 CP1920 CP1924
R1923 1k
R1921 1k
R1922 1k
MDAT
47k R1920
0.0047 C1920
R1924 1k
MCK
0.01 C1921
CP1926
RV-150 R1925
SPCH
CP1925 CP1922
J1920
_TRAS
_SENI
_OVDK
_ISTA
_9K6S
_AFMS
_SQLS
_SQSS
_NBS
_UNSB
47k
R1562
FZVP
FZRS
MR
_MSL2 _MSL1
_2F15
_2F3K
_P2MS
_P50S
_PHFS
LTXD
LRXD _AMS
_ASL
0.01 C1510 0.1 C1509 10 C1507 0.01 C1505
FZMD
FZMD
_H5VL
12p C1506 12p C1508
CR-520
X1500
SSTB
SBSY
0.1
C1512
0.1
C1511
0.01 C1561
FZRS
5VL
5VL
5VL
DRES
47k R1561
0.0047 C1560
47k R1560
HV
5
4 3
2
1
S-80942ANMP-DD6
IC1560
NC
CD
VSS
VDD
OUT
FZTX
FZRX
_NSQL
_DRQW
_DWBY
_DCK
_DDTW
MCK MDAT
100k R1941 100k R1940
0.01 C1940
MA2S111 D1940
33k
R1945
6.8k
R1943
2SC4081
Q1941
2SA1576
Q1940
47k R1942
8
7
6
5 4
3
2
1
TC7W04F
IC1940
15k
R1944
W1941
CIV
CIVE
_DRQR
_DDTR
_DRBY
_DSTR
_DCBY
_CTFL
_TOFF
_RTDT
_VSQL
_DSST
_DSKY
DRBY
DCBY
DWBY
DSTR
DRQR
DRQW
DDTR
DDTW
DCK R1964 1k
R1965 1k
R1966 1k
R1967 1k
R1968 1k
R1969 1k
R1970 1k
R1971 1k
R1972 1k
47k R1963 47k R1962 47k R1961 47k R1960
_DCK
_DDTW
_DDTR
_DRQW
_DRQR
_DSTR
_DWBY
_DCBY
_DRBY
R1985 1k
R1986 1k
R1987 1k
R1988 1k
R1989 1k
R1990 1k
R1991 1k NSQL
VSQL
TOFF
RTDT
CTFL
DSST
DSKY
0.0047 C1986 0.0047 C1985 0.0047 C1984 0.0047 C1983 0.0047 C1982 0.0047 C1981 0.0047 C1980
47k R1984 47k R1983 47k R1981
_DSKY
_DSST
_CTFL
_RTDT
_TOFF
_VSQL
47k R1982 47k R1980
_NSQL
_PWRK _ANTS _IKEY _RTKI
W1610 W1609 W1608 W1607 W1606 W1605 W1604 W1603 W1602 W1601 W1600
R1512 220
CON2
R1511 220
PDAT
R1510 220
PCK
R1509 220
PST5
R1508 220
PST3 PST2
R1507 220 R1506 220
PST1 _UNLC
R1505 220
_UNLC
47k R2000
0.0047 C2000
D2000 1SS385
UNLC
DRES
1k
R2042
0.0047 C2041
100k R2041
1
2
3
5
4
TC7S04F
IC2040
_PWRS
R1504 220
FSTB
R1503 220 R1502 220
0.1
C1503
0.1
C1502
0.1
C1501
0.1
C1500
_SKYS
R1501 220
BSTB
R1500 220
ASTB
10k
R1581
22k
R1580
8
7
6
5 4
3
2
1
A0
A1
A2
VSS
VCC
WP
SCL
SDA
HN58X24128FPI
IC1580
_TXS
_RXS
_DTCS
ESTA
TCON
EKEY
_MODS
0.047 C1907 1M R1901
R1909 1k _BEEP BEEP
_BEEP
_AVXL
_VOXL
_FMTL
_ASO2
_ASO1
_ASO0
_AVXL
_VOXL
_FMTL
0.0047 C1902 0.0047 C1901 0.0047 C1900
22k R1911 22k R1908
R1904 1k
R1903 1k
R1902 1k
AVXL
VOXL
FMTL
RB706F-40 D1901
RB706F-40 D1900
_ASL
FORL
THML
_ASO0
_ASO1
0.0047 C1904
R1905 1k
R1906 1k
0.1 C1908
R1907 1k
0.0047 C1906
ALCL
DPTL
REFL
BU4O503BCFV
IC1900
C
B
A
X0
X1
X
Y
VDD
VSS
VEE
INH
Z0
Z
Z1
Y0
Y1
16
15
14
13
12
11
10
9 8
7
6
5
4
3
2
1
ESTA
EKEY
TCON
_SQSS
_AFMS
_SQLS
_TXS
_RXS
_TRAS
_SENI
_RTKI
_SKYS
_OVDK
_MSL2
5VL
5VL
5VL
5VL
5VL
5VL
_MSL1
_2F15
_2F3K
_P2MS
_P50S
_PHFS
_AMS
MR
_DTCS
_MODS
_9K6S
_NBS
_UNSB
_ANTS
_PWRS
LTXD
LRXD
_PWRK
_IKEY
_H5VL
5VL
_ISTA
5V
_H5VL
_H5VL
1M R1882
47k R1883
R1881 1k
R1880 1k
DA221
D1881
DA221
D1880
DTC114EU
Q1880
0.0047 C1880 0.0047 C1881
L1881 10
µ
L1880 10
µ
KEY
START
47k R1863 47k R1864
0.0047 C1862 0.0047 C1861 0.0047 C1860
DTC114EU
Q1860
SQL R1862 1k
AFMS R1861 1k
R1860 1k SQLS
47k R1853 22k R1852 47k R1851
47k R1850
0.0047 C1846 0.0047 C1845 0.0047 C1844 0.0047 C1842 0.0047 C1841 0.0047 C1840
DA221
D1841
DA221
D1840
47k R1840
R1847 1k
D500 1SS133 W500
TXS
SEND
R1846 1k RXS
R1845 1k TRAS
SENI R1844 1k
R1843 1k RTKI
SKYS R1842 10k
R1841 10k OVDK
MA2S111 D1826 MA2S111 D1825 MA2S111 D1824 MA2S111 D1823
MA2S111 except [USA] D1822
47k R1828
0.0047 C1827 0.0047 C1826 0.0047 C1825 0.0047 C1824 0.0047 C1823 0.0047 C1822 0.0047 C1821 0.0047 C1820
R1827 1k MSL2
R1826 1k MSL1
R1825 1k 2F15
R1824 1k 2F3K
R1823 100 P2MS
R1822 1k P50S
R1821 1k PHFS
AMS R1820 1k
0.0047 C1803 0.0047 C1802 0.0047 C1801 0.0047 C1800 0.0047 C1804
R1804 1k
MODS R1803 1k
9K6S R1802 1k
NBS R1801 1k
UNSB R1800 1k
0.0047 C1760 0.0047 C1780
ANTS R1780 1k
PWRS R1760 1k
47k R1743 47k R1742
LMFD R1741 1k
LFMD R1740 1k
5V
8V
14V
_H5VL
10 C2020 0.1 C2021 0.1 C2022
L2061 1
µ
L2020 1
µ
R1721 47k
0.0047 C1720
R1720 1k PWRK
R1703 47k
47k R1702
0.0047 C1701 0.0047 C1700
R1701 1k IKEY
R1700 1k ISTA
PG2/CS2
PG1/CS3
PG0/CAS
MD2
MD0
MD1
P10/PO8/TIOCA0
P11/PO9/TIOCB0
P12/PO10/TIOCC0
P13/PO11/TIOCD0
P14/PO12/TIOCA1
P15/PO13/TIOCB1
P16/PO14/TIOCA2
P17/PO15/TIOCB2
VSS
AVSS
P47/AN7/DA1
P46/AN6/DA0
P45/AN5
P44/AN4
P43/AN3
P42/AN2
VREF
AVCC
P41/AN1
P40/AN0
PF0/BREQ
WDTOVF(FWE)
P53/ADTRG
P52/SCK2
VSS
P51/RXD2
VSS
PF1/BACK
P50/TXD2
PF2/LCAS/WAIT
PF3/LWR
PF4/HWR
PF5/RD PF6/AS
VCC
PF7/FAI
VSS
EXTAL
XTAL
VCC
STBY
RES
NMI
P20/PO0/TIOCA3 P21/PO1/TIOCB3 P22/PO2/TIOCC3 P23/PO3/TIOCD3 P25/PO5/TIOCB4 P24/PO4/TIOCA4 P26/PO6/TIOCA5 P27/PO7/TIOCB5
P63/TEND1
P62/DREQ1
P61/TEND0/CS5
VSS VSS VSS
P60/DREQ0/CS4
P35/SCK1
P34/SCK0
P33/RXD1
P31/TXD1
P32/RXD0
P30/TXD0
VCC
PD7/D15
PD6/D14
PD5/D13
PD4/D12
VSS
PD3/D11
PD2/D10
PD1/D9
PD0/D8
PE7/D7
PE6/D6
PE5/D5
PE4/D4
VSS
PE3/D3
PE2/D2
PE1/D1
VCC
PE0/D0
P64/IRQ0 P65/IRQ1 VSS PC66/CS6/IRQ2 PC67/CS7/IRQ2 PA7/A23/IRQ7 PA6/A22/IRQ6 PA5/A21/IRQ5 VSS PG4/CS0 PG3/CS1 NC VCC PC0/A0 PC1/A1 VSS PC3/A3 PC2/A2 PC4/A4 PC6/A6 PC5/A5 PC7/A7 PB0/A8 PB1/A9 PB2/A10 PB3/A11 VSS VSS PB4/A12 PB5/A13 PB6/A14 PA0/A16 PA1/A17 VSS PA3/A19 PA2/A18 PA4/A20/IRQ4 PB7/A15
128
127
126
125
124
123
122
121
120
119
118
117
116
115
114
113
112
111
110
109
108
107
106
105
104
103
102 101 100 99 98 97 96 95 94 93 92 91 90 89 88 87 86 85 84 83 82 81 80 79 78 77 76 75 74
_NSQL
73 72 71 70 69 68 67 66 65
64
63
62
61
60
59
58
57
56
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
40
39
38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10
9 8 7 6 5 4 3 2 1
HD6432357A26F
IC1500
BUS LINE2
BUS LINE1
5V
14V
8V
H5V
CP1625
EP761
EP760
EP781
EP780
EP783
EP782
EP784
EP790
EP786
EP788
MAIN UNIT (2)
2.5V
0.05
µ
sec
3.9V
0.05
µ
sec
4.9V
4.9V
0V
0V
4.7V
2.4mV
30.6mV
Is there a plug in phone of front?
yes: 13.64V
no: 0.065V
144M
TX: 7.56V
RX: 7mV HF+50M
TX: 4.7V
RX: 0V HF+50M
TX: 7mV
RX: 7.56V
HF+50M
TX: 0.748V
RX: 0V 144M
TX: 0.768V
RX: 0V
13.63V
TX: 0.75V
RX: 3mV
SQL ON: 7.85V
OFF: 0V
Range
Digital tester
Voltage at RX(No designation)
MEASUREMENT CONDITIONS
frequency: 14.1MHz USB
RX (no input)
200mV
2V
20V
Input resister
100M
Ω
11M
Ω
10M
Ω
Oscilloscope(20MHz,1M
Ω)
12-4 MAIN UNIT (2)