Main Unit (2) - Icom IC-7400 Service Manual

12-4 MAIN UNIT (2)

MAIN UNIT (2)
BUS LINE1
14V
14V
8V
8V
5V
5V
L2061 1µ L2020 1µ _H5VL
H5V
4.9V
R1703 47k
ISTA R1700 1k _ISTA
IKEY R1701 1k _IKEY
R1721 47k _H5VL
PWRK R1720 1k _PWRK
5VL
LFMD R1740 1k LRXD
LMFD R1741 1k LTXD
PWRS R1760 1k _PWRS
ANTS R1780 1k _ANTS
UNSB R1800 1k _UNSB
NBS R1801 1k _NBS
9K6S R1802 1k _9K6S
MODS R1803 1k _MODS
R1804 1k _DTCS
CP1000
MR
AMS R1820 1k _AMS
PHFS R1821 1k _PHFS
P50S R1822 1k _P50S
P2MS R1823 100 _P2MS
2F3K R1824 1k _2F3K
2F15 R1825 1k _2F15
MSL1 R1826 1k _MSL1
MSL2 R1827 1k _MSL2
5VL
D1840 D1841
DA221 DA221
MAIN OVDK R1841 10k _OVDK
UNIT SKYS R1842 10k _SKYS
RTKI R1843 1k _RTKI
(1) SENI R1844 1k _SENI
TRAS R1845 1k _TRAS
RXS R1846 1k _RXS
TXS R1847 1k _TXS
D500 1SS133 W500
SEND
5VL
SQLS R1860 1k _SQLS
AFMS R1861 1k _AFMS
SQL R1862 1k _SQSS
Q1860
DTC114EU
5VL
SQL ON: 7.85V
OFF: 0V D1880 D1881
DA221 DA221
START L1880 10µ R1880 1k TCON
KEY L1881 10µ R1881 1k EKEY
ESTA
Q1880
DTC114EU
_ASO2
IC1900
BU4O503BCFV
W304 1 16
5VL
Y1 VDD
REFL 2 15 R1906 1k _ASO1
Y0 Y
DPTL 3 14 R1905 1k _ASO0
Z1 X
R1907 1k 4 13 THML
Z X1
ALCL 5 12 FORL
Z0 X0
6 11 _ASL
INH A
7 10
VEE B
8 9
VSS C
5VL
FMTL R1902 1k _FMTL
VOXL R1903 1k _VOXL
AVXL R1904 1k _AVXL
BEEP R1909 1k _BEEP
D2000 1SS385 _UNLC
UNLC
5VL
BUS LINE2
12 - 4
5V
_H5VL
_H5VL
C1500
0.1
X1500
CR-520
C1501
0.1
C1502
0.1
C1503
0.1
103
AVCC 0.05µsec
104
VREF
2.5V 3.9V
_ASO0 105
P40/AN0
_ASO1 106
P41/AN1
_ASO2 107
P42/AN2
_FMTL 108
P43/AN3
_VOXL 109
P44/AN4
_AVXL 110
P45/AN5
111
P46/AN6/DA0
_BEEP 112
P47/AN7/DA1
113
AVSS
114
VSS
_MODS 115
P17/PO15/TIOCB2
IC1500
HD6432357A26F
EKEY 116
P16/PO14/TIOCA2
TCON 117
P15/PO13/TIOCB1
ESTA 118
P14/PO12/TIOCA1
_DTCS 119
P13/PO11/TIOCD0
CP1582 CP1583 120
P12/PO10/TIOCC0
121
P11/PO9/TIOCB0
122
P10/PO8/TIOCA0
123
MD0
124
MD1
MEASUREMENT CONDITIONS
frequency: 14.1MHz USB
125 RX (no input)
MD2
Oscilloscope(20MHz,1MΩ)
_RXS 126 Digital tester
PG0/CAS
Range Input resister
200mV 100MΩ
_TXS 127
PG1/CS3 2V 11MΩ
20V 10MΩ
128 Voltage at RX(No designation)
PG2/CS2
CP1581
IC1580
R1581 HN58X24128FPI
10k
5 4
SDA VSS
6 3
SCL A2
7 2
R1580 WP A1
8 1
22k VCC A0
14V
8V
5V
_H5VL
5VL
FZMD FZRS
R1562
47k
_H5VL
_NSQL
C1511
0.1
C1512
0.1
5VL
64 SBSY
0.05µsec P35/SCK1
63 SSTB
P34/SCK0
62 FZRX
P33/RXD1
61 CRXD
P32/RXD0
60 FZTX
P31/TXD1
59 CTXD
P30/TXD0
58
VCC
57 _DRQW
PD7/D15
56 _DWBY
PD6/D14
55 _DCK
PD5/D13
54 _DDTW _DCK
PD4/D12
_DDTW
53 _DDTR
VSS
_DRQW
52 _DRQR _DRQR
PD3/D11
_DSTR
51 _DDTR _DWBY
PD2/D10
_DCBY
50 _DRBY _DRBY
PD1/D9
49 _DSTR
PD0/D8
48 _DCBY
PE7/D7
47 _CTFL
PE6/D6
46 _TOFF 5VL
PE5/D5
45 _RTDT
PE4/D4
44 _DSKY
VSS
_DSST
43 _VSQL _CTFL
PE3/D3
_RTDT
42 _DSST _TOFF
PE2/D2
_VSQL
41 _DSKY _NSQL
PE1/D1
40
PE0/D0
39
VCC
W1940
CRSY
5VL
_ANTS
14V
CP9011
8V
KEY
CP9002 START
5V 14V
_H5VL
5VL
IC1560 SQL L700
S-80942ANMP-DD6
1 5 DOUT L701
OUT CD
2 DATA L702
VDD
3 4
VSS NC
AAFO L704
CP9009
R703 D700 L703
4.7k MA2S111 EXCCL3225U
R702 4.7k
Q700
DPTL 2SC4081
30.6mV
2.4mV
4.9V
R1943 R1945
6.8k 33k
MDAT R1923 1k
R1922 1k
R1924 1k
IC1940 4.7V MCK R1921 1k
TC7W04F CIV
Q1940
0V
2SA1576
8 1
R1944
15k
7 2 Q1941 SPCH
2SC4081
6 3
0V
CIVE
5 4
14V
SPS
R1964 1k DCK
R1965 1k DDTW PAFO
R1966 1k DDTR PAFE
R1967 1k DRQW 14V
R1968 1k DRQR RXS
R1969 1k DSTR
R1970 1k DWBY
R1971 1k DCBY
R1972 1k DRBY 144M SEND
HF & 50M SEND
5V HF+50M
TX: 7mV
Q783 RX: 7.56V
TRAS DTA114EE
Q788
DTC114EU
Q786
2SD1619
P2MS
R1985 1k DSKY
HF+50M
R1986 1k DSST
TX: 0.748V
RX: 0V
R1987 1k CTFL
R1988 1k RTDT R788 2.2k D783 MA2S111
R1989 1k TOFF
R1990 1k VSQL
R1991 1k NSQL
R787 2.2k D782 MA2S111
BAND
5V
IC2040 SQL
TC7S04F
5 1
2 14V
Q810
2SC4081
4 3 EALC
R812
R2042
33k
1k
AAFO
DRES
ACCMOD
J761
L760 220µ EKY
L761 220µ EST
L762 HF70ACC635050-T E14V
to CHASSIS
L763 HF70ACC635050-T EGND J1
GND
GND
J760
[DATA] EP761
CIV
J700
[REMOTE]
100µ
6 5
CIVE EP760
100µ
4 3
100µ
2 1
100µ
FZRX
FZTX
FZRS
FZVP
FZMD
_H5VL
J1920
CP1625
MDAT_UT
SSTB
SBSY
MCK_UT
5VL
SPCE
GND
SPCH
RL740
AHY103
L741
HF50ACC322513-B J740
R740 L742
10 HF50ACC322513-B
SSP
[EXT SP]
Is there a plug in phone of front?
yes: 13.64V PAFE
no: 0.065V
J741
SSP
Q740
DTC114EU PAFE to CTRL
unit J13
L795
HF50ACC322513-B
RL781
OMR-109F
J782
R790
10 [SEND]
HF+50M 144M
TX: 4.7V TX: 7.56V
RX: 0V RX: 7mV
[ALC]
EP780
Q787
DTC114EU
Q784 L796
HF50ACC322513-B
DTC114EU
13.63V
Q785
EP781
2SD1619
144M
TX: 0.768V
RX: 0V
TX: 0.75V
RX: 3mV [ACC (2)]
L780 L793 J780
HF50ACC322513-B
HF50ACC322513-B
7 6
L782 L790
L792
HF50ACC322513-B HF50ACC322513-B HF50ACC322513-B
3 1
L794
HF50ACC322513-B
5 4
2
L783
100µ
EP782
EP783
L781
100µ
L784
100µ [ACC (1)]
EP784
L785 L789 J781
HF50ACC322513-B HF50ACC322513-B
7 6
L787 100µ
3 8 1
EP790
5 4
L791
2
HF50ACC322513-B
L788
100µ
EP786
L786 100µ EP788
MAIN UNIT (2)