Icom IC-7400 Service Manual page 72

• FRONT UNIT (2/2)
A
B
C
D
R1123 1k
E
R1122 1k
F
R1101 1k
G
R1102 1k
H
R1103 1k
I
R1104 1k
J
R1105 1k
K
R1106 1k
L
R1107 1k
M
R1118 2.2k
R1119 1k
N
R1120 1k
O
R1121 1k
P
Q
1
R PC3/AN11
2
AVSS
C1001
3
0.1 TEST
C1002
4
12p X2
5
X1
6
VSS
7
OSC1
8
OSC2
9
S RES
C1003 10
MD0
12p
11
P20/IRQ4/ADTRG
12
P21/UD
13
IC1001
P22
FIND 14 HD6433833SD85H
P23
SPLD 15
P24
LOCD 16
P25
TXD 17
P26
RXD 18
P27
19
T P30/SCK1
20
U P31/SI1
21
V P32/SO1
22
P33/SCK2
23
P34/SI2
24
P35/SO2
25
W P36/STRB
X
Y
Z
D1004 D1003
DA221 DA221
a
b
c
d
e
f
CP531 CP532 CP533 CP534 CP535 CP536
J503
LDV
5VL
KI2 R531
KI3 R532
KI4
R533
KI5 R534
KI6 R535
KI7 R536
XFCK R537
MPWK R538
MPRK R539
W21
TXD R540
g
RXD R541
LOCD R542
SPLD R543
FIND R544
GND
GND
CP538 CP540 CP542 CP544 CP546
GND
CP537 CP539 CP541 CP543 CP545
GND
GND
CP547
GND
CP552 CP554
CP551 CP553 CP555
J505
MNUK MNUK R555
F1K F1K R556
F2K F2K R557
F3K F3K R558
F4K F4K R559
F5K F5K R560
SSBK SSBK
CWRK CWRK
AFMK AFMK
FILK FILK
R554 R553
GND GND
15k 4.7k
GND GND
CP556 CP558 CP560
GND GND
CP557 CP559
GND GND
GND GND
GND GND
GND GND
GND GND
GND GND
GND GND
GND GND
GND GND
h
i
C1007 0.1
IC1003
C1008
TC7W74F
0.1
IC1004a
8 6
TC7W32F
8
1 5 1
CK Q 7 FAI1
2
R1052
2 3
D Q 4
1k
7 4
IC1004b
TC7W32F
5
FAI2
3
6
R1051
1k
C1005 0.1
CNT1
CNT2
D1005 MA2S111
R1057 100k
C1016
0.1
75
P97/SEG40/CL1
74
P96/SEG39/CL2
73
P95/SEG38/DO
72
P94/SEG37/M
71 M
P93/SEG36
70 D
P92/SEG35
69 FRM
P91/SEG34
68 CL
P90/SEG33
67 LD7
P87/SEG32
66 LD6
P86/SEG31
65 LD5
P85/SEG30
64 LD4
P84/SEG29
63 LD3
P83/SEG28
62 LD2
P82/SEG27
61 LD1
P81/SEG26
60 LD0
P80/SEG25
59 LE2
P77/SEG24
58 LE1
P76/SEG23
57 LE0
P75/SEG22
56 LA0
P74/SEG21
55 LRES
P73/SEG20
54
P72/SEG19
53
P71/SEG18
52
P70/SEG17
51
P67/SEG16
C1201 0.0047
C1202 0.0047
C1203 0.0047
C1204 0.0047
C1208 0.0047
C1207 0.0047
C1206 0.0047
-8V
+8V
LDV
1k KI2
1k KI3
1k KI4
1k KI5
1k KI6
1k KI7 IC1010A
1k XFCK M5218AFP
1k MPWK
V2 1
1k MPRK
2.2k TXD R1025
15
680 RXD
2.2k LOCD
680 SPLD
IC1010B
680 FIND
V5 7
R1027
15
IC1011A
M5218AFP
V4 1
1k MNUK R1029
1k F1K 15
1k F2K
1k F3K
IC1011B
1k F4K
V3 7
1k F5K
R1031
15
IC1012A
R552 R551
M5218AFP
2.2k 6.8k
LDV
V6 1
KI1
R1060
R1033
18k
LRES
15
Q1012 XP4311
1 6
IC1012B
V1 7
2 5
R1035
15
3 4 5VL
5V
8V
-8V
R1008
10k
CNT1
R1007
10k
CNT2
R1037
2.2M
2 4
-
3
+
8
R1038
820k
IC1013a
M5218AFP
R1041
2.2M
6
-
5
+
R1042
IC1013b
820k
M5218AFP
C1015
10
8 3
+
2 1
- X22 X43
4
2
X21 X44
3
X20 X45
4
X19 X46
5
X18 X47
5 X17 6
+ X17 X48
6 X16 7
- X16 X49
X15 8
X15 X50
X14 9
X14 X51
X13 10
X13 X52
X12 11
X12 X53
X11 12
X11 X54
8 3 X10 13
+ X10 X55
2 X9 14
- X9 X56
4 X8 15
X8 X57
IC1007
X7 16
HD61203UFS
X7 X58
X6 17
X6 X59
X5 18
X5 X60
5 X4 19
+ X4 X61
6 X3 20
- X3 X62
X2 21
X2 X63
X1 22
X1 X64
V2 23
VEE VEE
V6 24
V6L V6R
V5 25
V5L V5R
8 3 V2 26
+ V2L V2R
2 V1 27
- V1L V1R
4 28
VCC TH
29
DL CL2
30
FS CL1
C1012
5
+ 0.1
6
-
R1022 R1021
4.7k 4.7k
R1009
150k
2 4
- 1
3
+
8 R1013
470
IC1005a
M5218AFP
R1014
COM7 1
180k COM7
6 2
- 7 SEG68
5 3
+ SEG67
R1018 4
IC1005b SEG66
470
5
M5218AFP SEG65
6
SEG64
7
SEG63
8
SEG62
9
SEG61
10
SEG60
11
SEG59
12
1 SEG58
13
SEG57
R1039 14
SEG56
56k
15
SEG55
16
SEG54
17
SEG53
18
SEG52
SEG51 19
SEG51
SEG50 20
SEG50
SEG49 21
7 SEG49
SEG48 22
SEG48
R1043 SEG47 23
SEG47
56k
SEG46 24
SEG46
SEG45 25
SEG45
DS1001
DLC-83006S4GT
5VL
FAI1
FAI2
80 1 80
ADC DB1
2 79
79
M DB0
78 3 78
VCC GND
77 V4 4 77 V4 V4
V4R V4L
76 V3 5 76 V3 V3
V3R V3L
75 V2 6 75 V2 V2
V2R V2L
74 V1 7 74 V1 V1
V1R V1L
73 V2 8 73 V2 V2
VEE2 VEE1
72 9 72 Y1
Y64 Y1
71 10 71 Y2
Y63 Y2
70 11 70 Y3
Y62 Y3
69 12 69 Y4
Y61 Y4
68 13 68 Y5
Y60 Y5
67 14 67 Y6
Y59 Y6
66 15 66 Y7
Y58 IC1008 Y7
65 Y57 16 65 Y8 Z57
HD61202UFS
Y57 Y8
64 Y56 17 64 Y9 Z56
Y56 Y9
63 Y55 18 63 Y10 Z55
Y55 Y10
62 Y54 19 62 Y11 Z54
Y54 Y11
61 Y53 20 61 Y12 Z53
Y53 Y12
60 Y52 21 60 Y13 Z52
Y52 Y13
59 Y51 22 59 Y14 Z51
Y51 Y14
58 V2 Y50 23 58 Y15 Z50
Y50 Y15
57 V6 Y49 24 57 Y16 Z49
Y49 Y16
56 V5 Y48 25 56 Y17 Z48
Y48 Y17
55 V2 Y47 26 55 Y18 Z47
Y47 Y18
54 V1 Y46 27 54 Y19 Z46
Y46 Y19
53 Y45 28 53 Y20 Z45
Y45 Y20
52 Y44 29 52 Y21 Z44
Y44 Y21
51 Y43 30 51 Y22 Z43
Y43 Y22
NOTICE: Refer to the PARTS LIST for the value and name of each component.
12 - 2
DISPLAY BOARD
R1020 R1019
4.7k 4.7k
W1020
75
R/W(WR)
74 LEO
E(RD)
73 R1023 2.2M
CL(OSC2)
72
CS(OSC1)
71 LA0
A0
70
SEG0
69
SEG1
68
SEG2
67
SEG3
66
SEG4
65
SEG5
64
SEG6
IC1006 63
SEG7
SED1522F0C 62
SEG8
61
SEG9
60
SEG10
59
SEG11
58
SEG12
57 SEG13
SEG13
56 SEG14
SEG14
55
SEG15
SEG15
54 SEG16
SEG16
53 SEG17
SEG17
52 SEG18
SEG18
51 SEG19
SEG19
1 80
ADC DB1
2
79
M DB0
3 78
VCC GND
4 77 V4
V4R V4L
5 76 V3
V3R V3L
6 75 V2
V2R V2L
7 74 V1
V1R V1L
8 73 V2
VEE2 VEE1
9 72 Z1
Y64 Y1
10 71 Z2
Y63 Y2
11 70 Z3
Y62 Y3
12 69 Z4
Y61 Y4
13 68 Z5
Y60 Y5
14 67 Z6
Y59 Y6
15 66 Z7
Y58 IC1009 Y7
16 65 Z8
HD61202UFS
Y57 Y8
17 64 Z9
Y56 Y9
18 63 Z10
Y55 Y10
19 62 Z11
Y54 Y11
20 61 Z12
Y53 Y12
21 60 Z13
Y52 Y13
22 59 Z14
Y51 Y14
23 58 Z15
Y50 Y15
24 57 Z16
Y49 Y16
25 56 Z17
Y48 Y17
26 55 Z18
Y47 Y18
27 54 Z19
Y46 Y19
28 53 Z20
Y45 Y20
29 52 Z21
Y44 Y21
30 51 Z22
Y43 Y22
FRONT UNIT